Post mortem on an IEC connector

[N_Cook]

Arfa Daily <arfa.daily@ntlworld.com> wrote in message
news:VJqVl.359$RM1.9@newsfe07.ams2...

"Smitty Two" <prestwhich@earthlink.net> wrote in message
newsrestwhich-35F38D.20591502062009@newsfarm.iad.highwinds-media.com...
In article <sxcVl.269$_T2.64@newsfe28.ams2>,
"Arfa Daily" <arfa.daily@ntlworld.com> wrote:

Still, apparently, they have now located some wreckage 400 miles out
into
the Atlantic, so I guess that they have around 28 days left to locate
and
recover the CVR and FDR boxes, which apparently are likely to be lying
in
around 13000 feet of water. Seems like the batteries for the pingers
are
good for about 30 days, and the transmitter is just about man enough to
get
a signal through 15000 feet of salt water. I guess that if they can
recover
them and they continued to function for any time after the initial
'event',
then we could know quite quickly what the primary cause of it going
down
was.

This whole "black box recovery" stuff seems silly to me. Given the
number of accidents in which the recorders are never found, or when
found are FUBAR, and given today's communications technology, I don't
know why data isn't being constantly streamed to ground recording
centers.

Ah. A point that I made to my pilot friend yesterday, and apparently, some
of the flight data is streamed to the ACARS system continuously, via
satellite. He says that height, speed, heading, inertial nav position
estimate, and true GPS position, amongst other things, are transmitted.
Which then begs the question of why it is so difficult to locate the
position of a downed aircraft. I guess that if it is coming down from 7
miles up, with significant forward speed, and not necessarily in one
piece,
that might make it more difficult. Still, I would have thought that it
would
have given them a bit more of a 'ball park' area to be looking in, than
seems to be the case. In fact, I remember seeing an episode of ACI, where
they took the place of last transmission of an aircraft, and then plotted
by
computer, how the pieces would fall, and came up with a location for a
door
I think it was, which struck me as pretty clever.

But yes. Given the level of compression that can be applied to data
streams
these days, it does seem archaic to record all this data on board the item
that you are trying to protect. I suppose privacy issues might come into
transmitting flight deck chat, but I'm sure that with the encryption
systems
available, and operating the same rolling window system, that could be
overcome.

I also questioned the state these boxes are in when found, but he said not
to be misled by their appearance. Apparently, if they were working in the
first place - and that's not always a given, which is a bit worrying - the
chances are that they will still be working when recovered. Seems that the
actual recorder is inside a sphere, and the battered bit that you always
see, is just an outer case, which might contain some ancilliary
electronics,
and is shaped to fit a rack in an equipment bay. Also, these days, they
employ solid state memory, rather than any kind of electro-mechanical
recording mech.

Arfa

Arfa

I thought they retained wire recording, as the data survived fire
temperatures above the 150C of Si which is easily exceeded in
a sustained fire , up to something close to the melting point
of steel.

I see the recent Quantas airbourne rollercoaster affair, over Oz, is now
deemed RFI intrusion.
I liked the scenario of the prime-minister's motorcade, anti-bomb detonation
phone-jammer system passing underneath that Boeing that crash landed at
Heathrow last year, just as the fuel management system failed. Compareed to
the official version of 2 separate fuel jelling/icing events coinciding

--
Diverse Devices, Southampton, England
electronic hints and repair briefs , schematics/manuals list on
http://home.graffiti.net/diverse:graffiti.net/

 

[Smitty Two]

In article <h053c9$l29$1@blackhelicopter.databasix.com>,
Bob Larter <bobbylarter@gmail.com> wrote:

Smitty Two wrote:
In article <sxcVl.269$_T2.64@newsfe28.ams2>,
"Arfa Daily" <arfa.daily@ntlworld.com> wrote:

Still, apparently, they have now located some wreckage 400 miles out into
the Atlantic, so I guess that they have around 28 days left to locate and
recover the CVR and FDR boxes, which apparently are likely to be lying in
around 13000 feet of water. Seems like the batteries for the pingers are
good for about 30 days, and the transmitter is just about man enough to
get
a signal through 15000 feet of salt water. I guess that if they can
recover
them and they continued to function for any time after the initial
'event',
then we could know quite quickly what the primary cause of it going down
was.

This whole "black box recovery" stuff seems silly to me. Given the
number of accidents in which the recorders are never found, or when
found are FUBAR, and given today's communications technology, I don't
know why data isn't being constantly streamed to ground recording
centers.

Technically, that'd be a bit tricky on (for example) a trip between New
York & London.

Really? So transatlantic flights are out of contact with flight control?

 

[Ron]

Arfa Daily wrote:

So, where do I find this PPrune board ?

http://www.pprune.org/
Ron

 

[Meat Plow]

On Tue, 2 Jun 2009 17:35:34 +0100, "Arfa Daily"
<arfa.daily@ntlworld.com>wrote:

"Meat Plow" <meat@petitmorte.net> wrote in message
news:2rvv3v.ivq.17.1@news.alt.net...
On Tue, 2 Jun 2009 10:49:57 +0100, "Arfa Daily"
arfa.daily@ntlworld.com>wrote:





Seems that today, an Air France Airbus A330 en route from Rio to Paris
with
238 people on board, has gone down without warning over the Atlantic.
Hard
to see what the pilot might have done wrong with the thing at 38000 ft
in
the cruise ...

Apparently, it disappeared off African trans-atlantic ATC radar, at
around
3am, our time.

This is not instilling a lot of confidence in me, regarding flying on
one
of
these things in October, instead of my usual Boeing ... :-|


Electrical and turbulence problems reported. Aircraft was sending
distress signals so it may have made a decent ditch. Air France's last
air disaster was the Concorde in 2000.

I've flown the 320-100 several times and the Mulhouse crash never
entered my mind. We actually had a 5 hour delay one time after a
hydraulic pump failed on the ground and had to be replaced.

I wouldn't worry about the 330 considering the number of those things
in the air at any given time and it's wonderful track record.

Yeah, I know what you're saying. It just bothers me a little that on say a
747, the driver has got a triple redundancy control system which
hydraulically links his yoke and pedals directly to the control surfaces,
and a robot driver that can be thoroughly switched off, such that in an
unusual set of circumstances, a quick-thinking and experienced guy sitting
behind those controls, might be able to recover a potentially catastrophic
situation by thinking outside the box, and doing something which maybe
puts
the airframe outside of the 'safe' envelope. From what I can understand of
the FBW systems, they are never going to allow you to do this, and in the
event of a total electrical systems collapse, your little joystick, and
the
computer(s) that it's connected to, are not going to be of any use to
control the aircraft, anyway.

My pilot friend rang me yesterday when all this was going down (honestly,
no
pun intended). He felt that there had to be more to it than just flying
into
a storm. He says that in general, if lightning hits an aluminium-bodied
plane, it tends to pass around the outside, and re-discharge and carry on
its way from the opposite side or wherever. He questioned whether the same
would happen on a carbon composite bodied plane, as the A330 apparently
is,
or whether the higher electrical resistance of such a material, would
cause
the lightning to 'stick around' as it were, and just fry the internal
systems, or even heat the material to the point where it just exploded. He
reckons that unless there was an absolutely catastrophic failure of the
airframe, a distress signal should have been able to be broadcast almost
all
the way down, as the last voice transmitter is battery powered to ensure
that it can still operate, even in the event of a catastrophic electrical
or
systems failure. Sobering thoughts ...

Arfa


Nah the Airbus is Aluminum skin sandwiched with carbon fiber
inside.The same 'Faraday" effect applies.

If I were to fly the 747 I would surely think of the design flaws that
caused the fuel tank to explode on Flight 800. Or the one where the
rear section cracked and lost pressure on the dome that seals the rear
end of the fuselage. No I wouldn't enjoy flying through an electrical
storm in any aircraft but I wouldn't be any more worried in an Airbus.

Military aircraft with complete fly by wire don't seem to have
problems with electrical discharge on the skin. I can imagine say an
F/A 18E flying at mach two encountering some extreme static
electricity from the friction of air and water molecules. One can only
wonder how many Joules develope on the aircraft's skin.

Hmmm. I wonder if a couple of sheets of Bacofoil glued on a vaguely
conductive piece of plastic-y material, is actually as good a dissipative or
deflective surface for lightning, as a 5mm thick fully metal skin ? I have
watched the programmes on both of the crashes that you quote, and I agree
that they give a (small) degree of cause for concern, but at least they were
both pinned down to exactly what caused them, and I would think that
suitable protective measures were put in place to prevent a recurrence.
Considering the size of the 747, and the number of years that the basic
design has been flying now, I think that it has proven to be a fantastically
reliable and safe aircraft.

I'm sure the Airbus aluminum skin is much more than foil. I watched
how it was constructed but forget the exact thickness. I think where
lightning is concerned it's not going to matter or even be that much
of a concern. To me, the more paths for conductivity as in a fully
aluminum-skinned airframe would negate the Faraday effect more than
aluminun sandwiched carbon fiber composites.

As far as the 747 goes, yes it is a tried and true airframe and I'm
sure they've learned from past mistakes. Doesn't mean that I can
completely eliminate them from my mind.

Still, apparently, they have now located some wreckage 400 miles out into
the Atlantic, so I guess that they have around 28 days left to locate and
recover the CVR and FDR boxes, which apparently are likely to be lying in
around 13000 feet of water. Seems like the batteries for the pingers are
good for about 30 days, and the transmitter is just about man enough to get
a signal through 15000 feet of salt water. I guess that if they can recover
them and they continued to function for any time after the initial 'event',
then we could know quite quickly what the primary cause of it going down
was.

A good jolt of lightning in the right place, a 1 in a million
circumstance could have rendered the flight controls useless.
It will be interesting to find out what happened provided the flight
data and cockpit voice recorders were still functioning after whatefer
happened.

 

[Arfa Daily]

electronics,
and is shaped to fit a rack in an equipment bay. Also, these days, they
employ solid state memory, rather than any kind of electro-mechanical
recording mech.

Arfa





I thought they retained wire recording, as the data survived fire
temperatures above the 150C of Si which is easily exceeded in
a sustained fire , up to something close to the melting point
of steel.

I see the recent Quantas airbourne rollercoaster affair, over Oz, is now
deemed RFI intrusion.

Probably some old VK checking if 10 metres has started opening yet ... !!

I liked the scenario of the prime-minister's motorcade, anti-bomb
detonation
phone-jammer system passing underneath that Boeing that crash landed at
Heathrow last year, just as the fuel management system failed. Compareed
to
the official version of 2 separate fuel jelling/icing events coinciding

Yes. That was an odd one. Given that the thing landed basically intact, with
a fully alive crew and completely undamaged flight recorders, it seemed
strange to me that they would very quickly wheel it away into a hangar, and
then take months to reach this conclusion. They talked about the thing
passing through an area of very cold air, and on some of the news reports
that I heard, they were talking "below -50 deg C". However, when you fly
across the Atlantic at 38000 feet, the temperature is always at around -56
deg C the whole way, according to the flight data display available as an
entertainment channel, and it doesn't seem to cause a problem. I'm sure that
designers must know this, and take it into account when working out the fuel
delivery and storage systems. When you think about how much (expensive)
systems redundancy is built into jet airliners in the pursuit of safety, it
would be a pretty unforgivable design oversight to make the fuel system not
able to cope with a few tens of degrees colder than it would normally expect
to encounter, wouldn't it ?

Arfa
>

 

[Arfa Daily]

"Smitty Two" <prestwhich@earthlink.net> wrote in message
newsrestwhich-8FF3E5.09182303062009@newsfarm.iad.highwinds-media.com...

In article <h053c9$l29$1@blackhelicopter.databasix.com>,
Bob Larter <bobbylarter@gmail.com> wrote:

Smitty Two wrote:
In article <sxcVl.269$_T2.64@newsfe28.ams2>,
"Arfa Daily" <arfa.daily@ntlworld.com> wrote:

Still, apparently, they have now located some wreckage 400 miles out
into
the Atlantic, so I guess that they have around 28 days left to locate
and
recover the CVR and FDR boxes, which apparently are likely to be lying
in
around 13000 feet of water. Seems like the batteries for the pingers
are
good for about 30 days, and the transmitter is just about man enough
to
get
a signal through 15000 feet of salt water. I guess that if they can
recover
them and they continued to function for any time after the initial
'event',
then we could know quite quickly what the primary cause of it going
down
was.

This whole "black box recovery" stuff seems silly to me. Given the
number of accidents in which the recorders are never found, or when
found are FUBAR, and given today's communications technology, I don't
know why data isn't being constantly streamed to ground recording
centers.

Technically, that'd be a bit tricky on (for example) a trip between New
York & London.

Really? So transatlantic flights are out of contact with flight control?

That certainly used to be the case. Most 'regular' civilian ATC takes place
on VHF, which obviously has quite limited range. Transatlantic airliners do
stay in contact with their own offices via HF SSB I believe, using a
sel-call system. I believe that weather reports are also communicated
likewise. I don't suppose that there is much need for ATC when mid Atlantic.
Your course is pretty much pre-planned and established, barring odd
unforseen circumstances. ATC monitoring used to be a bit of a hobby of mine,
but I haven't kept up to date with it. Maybe these days, they are in touch
with someone constantly. I guess it wouldn't be that difficult via
satellite, especially if they are already relaying ACARS data in that way,
as my pilot friend says they are.

Ah. Here ya go ...

http://www.prnewswire.co.uk/cgi/news/release?id=51137

Arfa

 

[Meat Plow]

On Wed, 3 Jun 2009 18:39:27 +0100, "Arfa Daily"
<arfa.daily@ntlworld.com>wrote:

electronics,
and is shaped to fit a rack in an equipment bay. Also, these days, they
employ solid state memory, rather than any kind of electro-mechanical
recording mech.

Arfa





I thought they retained wire recording, as the data survived fire
temperatures above the 150C of Si which is easily exceeded in
a sustained fire , up to something close to the melting point
of steel.

I see the recent Quantas airbourne rollercoaster affair, over Oz, is now
deemed RFI intrusion.

Probably some old VK checking if 10 metres has started opening yet ... !!


I liked the scenario of the prime-minister's motorcade, anti-bomb
detonation
phone-jammer system passing underneath that Boeing that crash landed at
Heathrow last year, just as the fuel management system failed. Compareed
to
the official version of 2 separate fuel jelling/icing events coinciding

Yes. That was an odd one. Given that the thing landed basically intact, with
a fully alive crew and completely undamaged flight recorders, it seemed
strange to me that they would very quickly wheel it away into a hangar, and
then take months to reach this conclusion. They talked about the thing
passing through an area of very cold air, and on some of the news reports
that I heard, they were talking "below -50 deg C". However, when you fly
across the Atlantic at 38000 feet, the temperature is always at around -56
deg C the whole way, according to the flight data display available as an
entertainment channel, and it doesn't seem to cause a problem. I'm sure that
designers must know this, and take it into account when working out the fuel
delivery and storage systems. When you think about how much (expensive)
systems redundancy is built into jet airliners in the pursuit of safety, it
would be a pretty unforgivable design oversight to make the fuel system not
able to cope with a few tens of degrees colder than it would normally expect
to encounter, wouldn't it ?

From Wiki:

"Commercial airliners typically cruise at altitudes of 9-12 km in
temperate latitudes, in the lower reaches of the stratosphere.[3] They
do this to optimize jet engine fuel burn, mostly thanks to the low
temperatures encountered near the tropopause. It also allows them to
stay above any hard weather, and avoid atmospheric turbulence from the
convection in the troposphere. Turbulence experienced in the cruise
phase of flight is often caused by convective overshoot from the
troposphere below."

I'm certain even without asking that anti-gel additives are used in
commercial and military fuels. But as indicated in the Wiki article\
different layers of the upper atmosphere have different temperatures
and while inside at least the Stratosphere the idea that the higher
you fly, the colder it gets doesn't apply.

 

[Meat Plow]

On Wed, 3 Jun 2009 18:58:56 +0100, "Arfa Daily"
<arfa.daily@ntlworld.com>wrote:

"Smitty Two" <prestwhich@earthlink.net> wrote in message
newsrestwhich-8FF3E5.09182303062009@newsfarm.iad.highwinds-media.com...
In article <h053c9$l29$1@blackhelicopter.databasix.com>,
Bob Larter <bobbylarter@gmail.com> wrote:

Smitty Two wrote:
In article <sxcVl.269$_T2.64@newsfe28.ams2>,
"Arfa Daily" <arfa.daily@ntlworld.com> wrote:

Still, apparently, they have now located some wreckage 400 miles out
into
the Atlantic, so I guess that they have around 28 days left to locate
and
recover the CVR and FDR boxes, which apparently are likely to be lying
in
around 13000 feet of water. Seems like the batteries for the pingers
are
good for about 30 days, and the transmitter is just about man enough
to
get
a signal through 15000 feet of salt water. I guess that if they can
recover
them and they continued to function for any time after the initial
'event',
then we could know quite quickly what the primary cause of it going
down
was.

This whole "black box recovery" stuff seems silly to me. Given the
number of accidents in which the recorders are never found, or when
found are FUBAR, and given today's communications technology, I don't
know why data isn't being constantly streamed to ground recording
centers.

Technically, that'd be a bit tricky on (for example) a trip between New
York & London.

Really? So transatlantic flights are out of contact with flight control?

That certainly used to be the case. Most 'regular' civilian ATC takes place
on VHF, which obviously has quite limited range. Transatlantic airliners do
stay in contact with their own offices via HF SSB I believe, using a
sel-call system. I believe that weather reports are also communicated
likewise. I don't suppose that there is much need for ATC when mid Atlantic.
Your course is pretty much pre-planned and established, barring odd
unforseen circumstances. ATC monitoring used to be a bit of a hobby of mine,
but I haven't kept up to date with it. Maybe these days, they are in touch
with someone constantly. I guess it wouldn't be that difficult via
satellite, especially if they are already relaying ACARS data in that way,
as my pilot friend says they are.

Ah. Here ya go ...

http://www.prnewswire.co.uk/cgi/news/release?id=51137

Arfa

I've listened to trans-atlantic traffic control on HF, usually lower
SSB.

http://www.hamuniverse.com/aerofreq.html

Scroll down to the boxed descriptions.

 

[Bob Larter]

Smitty Two wrote:

In article <h053c9$l29$1@blackhelicopter.databasix.com>,
Bob Larter <bobbylarter@gmail.com> wrote:

Smitty Two wrote:
In article <sxcVl.269$_T2.64@newsfe28.ams2>,
"Arfa Daily" <arfa.daily@ntlworld.com> wrote:

Still, apparently, they have now located some wreckage 400 miles out into
the Atlantic, so I guess that they have around 28 days left to locate and
recover the CVR and FDR boxes, which apparently are likely to be lying in
around 13000 feet of water. Seems like the batteries for the pingers are
good for about 30 days, and the transmitter is just about man enough to
get
a signal through 15000 feet of salt water. I guess that if they can
recover
them and they continued to function for any time after the initial
'event',
then we could know quite quickly what the primary cause of it going down
was.
This whole "black box recovery" stuff seems silly to me. Given the
number of accidents in which the recorders are never found, or when
found are FUBAR, and given today's communications technology, I don't
know why data isn't being constantly streamed to ground recording
centers.
Technically, that'd be a bit tricky on (for example) a trip between New
York & London.

Really? So transatlantic flights are out of contact with flight control?

I honestly don't know, but I assume they would be for at least part of
the trip. But even if I'm wrong about that, I doubt that there'd be the
bandwidth available for every plane in the air to be continuously
streaming 20+ channels of telemetry, etc, back to base.

--
W
. | ,. w , "Some people are alive only because
\|/ \|/ it is illegal to kill them." Perna condita delenda est
---^----^---------------------------------------------------------------

 

[Meat Plow]

On Fri, 05 Jun 2009 11:47:44 +1000, Bob Larter
<bobbylarter@gmail.com>wrote:

Smitty Two wrote:
In article <h053c9$l29$1@blackhelicopter.databasix.com>,
Bob Larter <bobbylarter@gmail.com> wrote:

Smitty Two wrote:
In article <sxcVl.269$_T2.64@newsfe28.ams2>,
"Arfa Daily" <arfa.daily@ntlworld.com> wrote:

Still, apparently, they have now located some wreckage 400 miles out into
the Atlantic, so I guess that they have around 28 days left to locate and
recover the CVR and FDR boxes, which apparently are likely to be lying in
around 13000 feet of water. Seems like the batteries for the pingers are
good for about 30 days, and the transmitter is just about man enough to
get
a signal through 15000 feet of salt water. I guess that if they can
recover
them and they continued to function for any time after the initial
'event',
then we could know quite quickly what the primary cause of it going down
was.
This whole "black box recovery" stuff seems silly to me. Given the
number of accidents in which the recorders are never found, or when
found are FUBAR, and given today's communications technology, I don't
know why data isn't being constantly streamed to ground recording
centers.
Technically, that'd be a bit tricky on (for example) a trip between New
York & London.

Really? So transatlantic flights are out of contact with flight control?

I honestly don't know, but I assume they would be for at least part of
the trip. But even if I'm wrong about that, I doubt that there'd be the
bandwidth available for every plane in the air to be continuously
streaming 20+ channels of telemetry, etc, back to base.

Commercial lines have GPS tracking and sat communications if needed.
Plus there are many HF channels for flight control and military
tracking stations located strategically upon small islands, atolls,
etc.. that would surely assist commercial aviators.

 

[Bob Larter]

Meat Plow wrote:

On Fri, 05 Jun 2009 11:47:44 +1000, Bob Larter
bobbylarter@gmail.com>wrote:

Smitty Two wrote:
In article <h053c9$l29$1@blackhelicopter.databasix.com>,
Bob Larter <bobbylarter@gmail.com> wrote:

Smitty Two wrote:
In article <sxcVl.269$_T2.64@newsfe28.ams2>,
"Arfa Daily" <arfa.daily@ntlworld.com> wrote:

Still, apparently, they have now located some wreckage 400 miles out into
the Atlantic, so I guess that they have around 28 days left to locate and
recover the CVR and FDR boxes, which apparently are likely to be lying in
around 13000 feet of water. Seems like the batteries for the pingers are
good for about 30 days, and the transmitter is just about man enough to
get
a signal through 15000 feet of salt water. I guess that if they can
recover
them and they continued to function for any time after the initial
'event',
then we could know quite quickly what the primary cause of it going down
was.
This whole "black box recovery" stuff seems silly to me. Given the
number of accidents in which the recorders are never found, or when
found are FUBAR, and given today's communications technology, I don't
know why data isn't being constantly streamed to ground recording
centers.
Technically, that'd be a bit tricky on (for example) a trip between New
York & London.
Really? So transatlantic flights are out of contact with flight control?
I honestly don't know, but I assume they would be for at least part of
the trip. But even if I'm wrong about that, I doubt that there'd be the
bandwidth available for every plane in the air to be continuously
streaming 20+ channels of telemetry, etc, back to base.

Commercial lines have GPS tracking and sat communications if needed.
Plus there are many HF channels for flight control and military
tracking stations located strategically upon small islands, atolls,
etc.. that would surely assist commercial aviators.

Yeah, but Jeez, that'd be an incredible effort to go to!

--
W
. | ,. w , "Some people are alive only because
\|/ \|/ it is illegal to kill them." Perna condita delenda est
---^----^---------------------------------------------------------------

 

[Mike]

On Thu, 28 May 2009 01:52:41 +0100, "Arfa Daily"
<arfa.daily@ntlworld.com> wrote:

So do I, my friend, as I am about to get on one for the first time in
October. All of my previous cross-pond jaunts have been in properly built
747s, which have a proper yoke for the driver to hang on to, and
'automatics' that can be switched off.

Boeings have always had issues with their design. 737 rudder
hydraulics for example were a death trap waiting to happen and some
fuckwits let them keep flying despite a serious design issue being
known about for 15 years... and as for the 747, we have fuel tanks
that explode, engines that fall off, lightning strikes that make the
wing fall off to name but a few.

Walk around a Boeing assembly plant, or previously an MD plant and you
see workers in casual street clothes, keys hanging off their
waistband, loose items in their pockets. Walk around an Airbus plant
and you see workers in specific work clothes with *no* pockets, with
tight control on personnel access and all losses of hardware being
fully investigated. At Boeing you get birds nesting in the structures
and people eating food, people dropping small items and just picking
another one from a parts bin with no regard for where the stray bits
end up. Look at the number of foreign objects found in nooks and
crannies on Boeing aircraft during their maintenance stripdowns - a
full size sweeping brush FFS! numerous coins, numerous spare
fasteners, a mouldy sandwich, even huge ring binders stuffed with 'QA
documentation'

There's something fundamentally wrong
about a plane that has to be flown with a left-handed joystick,

Then sit in the other seat with a right handed joystick.

and which employs a robot driver hidden away somewhere,
which believes it knows more
about how to fly a plane, than the human guy and his chum in the co-seat,
who have 40 years flying experience between them ... :-\

The robot driver *usually* *does* know more, but not always.


--

 

[Meat Plow]

On Sat, 06 Jun 2009 02:43:03 +1000, Bob Larter
<bobbylarter@gmail.com>wrote:

Meat Plow wrote:
On Fri, 05 Jun 2009 11:47:44 +1000, Bob Larter
bobbylarter@gmail.com>wrote:

Smitty Two wrote:
In article <h053c9$l29$1@blackhelicopter.databasix.com>,
Bob Larter <bobbylarter@gmail.com> wrote:

Smitty Two wrote:
In article <sxcVl.269$_T2.64@newsfe28.ams2>,
"Arfa Daily" <arfa.daily@ntlworld.com> wrote:

Still, apparently, they have now located some wreckage 400 miles out into
the Atlantic, so I guess that they have around 28 days left to locate and
recover the CVR and FDR boxes, which apparently are likely to be lying in
around 13000 feet of water. Seems like the batteries for the pingers are
good for about 30 days, and the transmitter is just about man enough to
get
a signal through 15000 feet of salt water. I guess that if they can
recover
them and they continued to function for any time after the initial
'event',
then we could know quite quickly what the primary cause of it going down
was.
This whole "black box recovery" stuff seems silly to me. Given the
number of accidents in which the recorders are never found, or when
found are FUBAR, and given today's communications technology, I don't
know why data isn't being constantly streamed to ground recording
centers.
Technically, that'd be a bit tricky on (for example) a trip between New
York & London.
Really? So transatlantic flights are out of contact with flight control?
I honestly don't know, but I assume they would be for at least part of
the trip. But even if I'm wrong about that, I doubt that there'd be the
bandwidth available for every plane in the air to be continuously
streaming 20+ channels of telemetry, etc, back to base.

Commercial lines have GPS tracking and sat communications if needed.
Plus there are many HF channels for flight control and military
tracking stations located strategically upon small islands, atolls,
etc.. that would surely assist commercial aviators.

Yeah, but Jeez, that'd be an incredible effort to go to!

Well what effort would you go to if you were in the captians seat and
your bearings didn't jive?

 

[Meat Plow]

On Fri, 05 Jun 2009 22:51:14 +0100, Mike <nospam@nospam.com>wrote:

On Thu, 28 May 2009 01:52:41 +0100, "Arfa Daily"
arfa.daily@ntlworld.com> wrote:

So do I, my friend, as I am about to get on one for the first time in
October. All of my previous cross-pond jaunts have been in properly built
747s, which have a proper yoke for the driver to hang on to, and
'automatics' that can be switched off.

Boeings have always had issues with their design. 737 rudder
hydraulics for example were a death trap waiting to happen and some
fuckwits let them keep flying despite a serious design issue being
known about for 15 years... and as for the 747, we have fuel tanks
that explode, engines that fall off, lightning strikes that make the
wing fall off to name but a few.

The 737 issue was with the rudder screw. An engine that fell from I
think an AA DC10 was caused by a pylon fitting that was damaged by
a engine refit. Flight 800 fuel tank exploded under extraordinary
conditions and was corrected. As far as lightning taking out a wing,
what flight was that?

Walk around a Boeing assembly plant, or previously an MD plant and you
see workers in casual street clothes, keys hanging off their
waistband, loose items in their pockets. Walk around an Airbus plant
and you see workers in specific work clothes with *no* pockets, with
tight control on personnel access and all losses of hardware being
fully investigated. At Boeing you get birds nesting in the structures
and people eating food, people dropping small items and just picking
another one from a parts bin with no regard for where the stray bits
end up. Look at the number of foreign objects found in nooks and
crannies on Boeing aircraft during their maintenance stripdowns - a
full size sweeping brush FFS! numerous coins, numerous spare
fasteners, a mouldy sandwich, even huge ring binders stuffed with 'QA
documentation'

Didn't an Airbus 310's rudder rip completely off the fuselage a few
years ago. Boeing has been making some pretty reliable military and
civilian aircraft for 60 years. Airbus?

There's something fundamentally wrong
about a plane that has to be flown with a left-handed joystick,

Then sit in the other seat with a right handed joystick.

and which employs a robot driver hidden away somewhere,
which believes it knows more
about how to fly a plane, than the human guy and his chum in the co-seat,
who have 40 years flying experience between them ... :-\

The robot driver *usually* *does* know more, but not always.

All newer military aircraft depend entirely upon a 'robot' to fly
them. A human can't respond fast enough to fly an aircraft
purposefully designed to be aerodynamically unstable like the
F/A 117, F16, YF 22, F 18/e.

 

[Arfa Daily]

"Mike" <nospam@nospam.com> wrote in message
news:kl4j25dff5bqpkmmuuvg2fpfk24sl0uu3d@4ax.com...

On Thu, 28 May 2009 01:52:41 +0100, "Arfa Daily"
arfa.daily@ntlworld.com> wrote:

So do I, my friend, as I am about to get on one for the first time in
October. All of my previous cross-pond jaunts have been in properly built
747s, which have a proper yoke for the driver to hang on to, and
'automatics' that can be switched off.

Boeings have always had issues with their design. 737 rudder
hydraulics for example were a death trap waiting to happen and some
fuckwits let them keep flying despite a serious design issue being
known about for 15 years... and as for the 747, we have fuel tanks
that explode, engines that fall off, lightning strikes that make the
wing fall off to name but a few.

Walk around a Boeing assembly plant, or previously an MD plant and you
see workers in casual street clothes, keys hanging off their
waistband, loose items in their pockets. Walk around an Airbus plant
and you see workers in specific work clothes with *no* pockets, with
tight control on personnel access and all losses of hardware being
fully investigated. At Boeing you get birds nesting in the structures
and people eating food, people dropping small items and just picking
another one from a parts bin with no regard for where the stray bits
end up. Look at the number of foreign objects found in nooks and
crannies on Boeing aircraft during their maintenance stripdowns - a
full size sweeping brush FFS! numerous coins, numerous spare
fasteners, a mouldy sandwich, even huge ring binders stuffed with 'QA
documentation'

There's something fundamentally wrong
about a plane that has to be flown with a left-handed joystick,

Then sit in the other seat with a right handed joystick.

and which employs a robot driver hidden away somewhere,
which believes it knows more
about how to fly a plane, than the human guy and his chum in the co-seat,
who have 40 years flying experience between them ... :-\

The robot driver *usually* *does* know more, but not always.


--

Conventionally, a fixed wing pilot sits in the left seat. This is a hangover
from airfields having a left hand circuit for fixed wings, so on the circuit
leg turns, the bank is in the direction that the pilot has a view of the
ground and is able to see that he does not overshoot his turn points.
Obviously, that does not apply with airport 'straight in' long finals
approaches, but I don't think that you really want to be having one flight
deck seating convention for one plane, and the opposite for another.

As far as the robot knowing more than a human pilot, on paper that might be
true. But sometimes, complex tasks like flying require dynamic 'outside the
box' thinking to handle unforseen circumstances, and that is where the
experience and flexible thought processes of an experienced flight crew,
might just make the difference.

With the A330 incident, AF investigators have today announced that the
automatic ACARS error messages were streaming events of "inconsistent
height" and "inconsistent speed", which they think may have been due to the
automatic throttles cycling as a result of the heavy turbulence which the
pilot had declared he was encountering, using the ACARS manual text
messaging option. Presumably, if that was what was actually occuring, it
would not have been desirable, and the pilot would have been aware of it, so
is this an example of a total fly by wire control system that the pilot
cannot disengage, and operate manually ?

The trouble is that once you've thrown away the yoke and other manual
controls, there's no going back. I don't have a basic problem with a fly by
wire system, but I think that the option of over-riding it in exceptional
circumstances, and when agreed by both crew, is the sensible one. If you
totally lose the computer systems, or have a total electrical failure on one
of these planes, then that's it. You are screwed every which way, and you
are going to die. If you have a similar failure on a plane which has a
triple redundancy hydraulically linked set of controls, then provided that
the fluid resevoirs retain some system pressure, there's a good chance that
the pilot is going to be able to at least make a controlled descent, and
possibly even a successful landing.

Arfa

 

[Meat Plow]

On Sun, 7 Jun 2009 16:54:39 +0100, "Arfa Daily"
<arfa.daily@ntlworld.com>wrote:

"Mike" <nospam@nospam.com> wrote in message
news:kl4j25dff5bqpkmmuuvg2fpfk24sl0uu3d@4ax.com...
On Thu, 28 May 2009 01:52:41 +0100, "Arfa Daily"
arfa.daily@ntlworld.com> wrote:

So do I, my friend, as I am about to get on one for the first time in
October. All of my previous cross-pond jaunts have been in properly built
747s, which have a proper yoke for the driver to hang on to, and
'automatics' that can be switched off.

Boeings have always had issues with their design. 737 rudder
hydraulics for example were a death trap waiting to happen and some
fuckwits let them keep flying despite a serious design issue being
known about for 15 years... and as for the 747, we have fuel tanks
that explode, engines that fall off, lightning strikes that make the
wing fall off to name but a few.

Walk around a Boeing assembly plant, or previously an MD plant and you
see workers in casual street clothes, keys hanging off their
waistband, loose items in their pockets. Walk around an Airbus plant
and you see workers in specific work clothes with *no* pockets, with
tight control on personnel access and all losses of hardware being
fully investigated. At Boeing you get birds nesting in the structures
and people eating food, people dropping small items and just picking
another one from a parts bin with no regard for where the stray bits
end up. Look at the number of foreign objects found in nooks and
crannies on Boeing aircraft during their maintenance stripdowns - a
full size sweeping brush FFS! numerous coins, numerous spare
fasteners, a mouldy sandwich, even huge ring binders stuffed with 'QA
documentation'

There's something fundamentally wrong
about a plane that has to be flown with a left-handed joystick,

Then sit in the other seat with a right handed joystick.

and which employs a robot driver hidden away somewhere,
which believes it knows more
about how to fly a plane, than the human guy and his chum in the co-seat,
who have 40 years flying experience between them ... :-\

The robot driver *usually* *does* know more, but not always.


--

Conventionally, a fixed wing pilot sits in the left seat. This is a hangover
from airfields having a left hand circuit for fixed wings, so on the circuit
leg turns, the bank is in the direction that the pilot has a view of the
ground and is able to see that he does not overshoot his turn points.
Obviously, that does not apply with airport 'straight in' long finals
approaches, but I don't think that you really want to be having one flight
deck seating convention for one plane, and the opposite for another.

As far as the robot knowing more than a human pilot, on paper that might be
true. But sometimes, complex tasks like flying require dynamic 'outside the
box' thinking to handle unforseen circumstances, and that is where the
experience and flexible thought processes of an experienced flight crew,
might just make the difference.

With the A330 incident, AF investigators have today announced that the
automatic ACARS error messages were streaming events of "inconsistent
height" and "inconsistent speed", which they think may have been due to the
automatic throttles cycling as a result of the heavy turbulence which the
pilot had declared he was encountering, using the ACARS manual text
messaging option. Presumably, if that was what was actually occuring, it
would not have been desirable, and the pilot would have been aware of it, so
is this an example of a total fly by wire control system that the pilot
cannot disengage, and operate manually ?

The trouble is that once you've thrown away the yoke and other manual
controls, there's no going back. I don't have a basic problem with a fly by
wire system, but I think that the option of over-riding it in exceptional
circumstances, and when agreed by both crew, is the sensible one. If you
totally lose the computer systems, or have a total electrical failure on one
of these planes, then that's it. You are screwed every which way, and you
are going to die. If you have a similar failure on a plane which has a
triple redundancy hydraulically linked set of controls, then provided that
the fluid resevoirs retain some system pressure, there's a good chance that
the pilot is going to be able to at least make a controlled descent, and
possibly even a successful landing.

Arfa

I heard it was pitot icing which isn't supposed to happen on heated
pitots which all icing condition certified aircraft should have.
Take away that info gather by the pitots and you disable the
aircraft's ability to process flight dynamics. Pitot readings
indicated a lower than normal airspeed, the engines throttle up
and the aircraft then flies too fast for the turbulent conditions
causing a catastrophic failure of the airframe. Decompression occurs
and the airframe breaks apart at FL 330.

 

[Arfa Daily]

"Meat Plow" <meat@petitmorte.net> wrote in message
news:2sak1j.6b8.17.14@news.alt.net...

On Fri, 05 Jun 2009 22:51:14 +0100, Mike <nospam@nospam.com>wrote:

On Thu, 28 May 2009 01:52:41 +0100, "Arfa Daily"
arfa.daily@ntlworld.com> wrote:

So do I, my friend, as I am about to get on one for the first time in
October. All of my previous cross-pond jaunts have been in properly built
747s, which have a proper yoke for the driver to hang on to, and
'automatics' that can be switched off.

Boeings have always had issues with their design. 737 rudder
hydraulics for example were a death trap waiting to happen and some
fuckwits let them keep flying despite a serious design issue being
known about for 15 years... and as for the 747, we have fuel tanks
that explode, engines that fall off, lightning strikes that make the
wing fall off to name but a few.

The 737 issue was with the rudder screw. An engine that fell from I
think an AA DC10 was caused by a pylon fitting that was damaged by
a engine refit. Flight 800 fuel tank exploded under extraordinary
conditions and was corrected. As far as lightning taking out a wing,
what flight was that?

Walk around a Boeing assembly plant, or previously an MD plant and you
see workers in casual street clothes, keys hanging off their
waistband, loose items in their pockets. Walk around an Airbus plant
and you see workers in specific work clothes with *no* pockets, with
tight control on personnel access and all losses of hardware being
fully investigated. At Boeing you get birds nesting in the structures
and people eating food, people dropping small items and just picking
another one from a parts bin with no regard for where the stray bits
end up. Look at the number of foreign objects found in nooks and
crannies on Boeing aircraft during their maintenance stripdowns - a
full size sweeping brush FFS! numerous coins, numerous spare
fasteners, a mouldy sandwich, even huge ring binders stuffed with 'QA
documentation'

Didn't an Airbus 310's rudder rip completely off the fuselage a few
years ago. Boeing has been making some pretty reliable military and
civilian aircraft for 60 years. Airbus?

There's something fundamentally wrong
about a plane that has to be flown with a left-handed joystick,

Then sit in the other seat with a right handed joystick.

and which employs a robot driver hidden away somewhere,
which believes it knows more
about how to fly a plane, than the human guy and his chum in the co-seat,
who have 40 years flying experience between them ... :-\

The robot driver *usually* *does* know more, but not always.

All newer military aircraft depend entirely upon a 'robot' to fly
them. A human can't respond fast enough to fly an aircraft
purposefully designed to be aerodynamically unstable like the
F/A 117, F16, YF 22, F 18/e.

The thing is though that the FBW systems on a fighter aircraft are not quite
the same as on a civilian airliner. Military aircraft are designed with
having the pilot being able to throw them around the sky in a tactical
manner in mind. This is the reason that they don't actually 'fly', and the
reason that a computer system is needed to interpret the stick inputs from
the pilot, and analyse the many conditions that prevail at that moment, and
then give the control surfaces the appropriate input to make this unstable
missile, do what the pilot wants it to.

On the other hand, a jet airliner is not an unstable lump, and does fly all
on its own. Responses for inputs are absolutely predictable. Given that we
are talking about the safety of several hundreds of civilians here, I really
would prefer that if anything went wrong with the automatic decisions of the
FBW, or even if there was a massive systems failure, that the pilot at least
had a fighting chance of being able to manually control the aircraft,
instead of just sitting in his seat waiting to hit the ground ...

I can see the point of FBW systems on fighter aircraft, but the reason for
having them on civilian airliners, eludes me. It's all very well saying that
they eliminate pilot error, but it seems that they are also responsible for
'machine error' accidents. I was talking to my aviator friend again today,
and he says that there have been many low altitude incidents where the robot
has got it wrong, resulting in wing waggles and roller coaster rides. The
thing is, the general public don't really hear about them, as they are not
castrophic events.

Apparently, Airbus are now speeding up the replacement of Pitot heads on all
their aircraft. Something to do with the anti-ice heater not being good
enough. Makes you wonder whether the error messages that were sent on the
ACARS, followed a pattern that had been seen before, and was known to be
associated with Pitot tube icing ...

Arfa

 

[N_Cook]

Meat Plow <meat@petitmorte.net> wrote in message
news:2sak1j.6b8.17.14@news.alt.net...

On Fri, 05 Jun 2009 22:51:14 +0100, Mike <nospam@nospam.com>wrote:

On Thu, 28 May 2009 01:52:41 +0100, "Arfa Daily"
arfa.daily@ntlworld.com> wrote:

So do I, my friend, as I am about to get on one for the first time in
October. All of my previous cross-pond jaunts have been in properly
built
747s, which have a proper yoke for the driver to hang on to, and
'automatics' that can be switched off.

Boeings have always had issues with their design. 737 rudder
hydraulics for example were a death trap waiting to happen and some
fuckwits let them keep flying despite a serious design issue being
known about for 15 years... and as for the 747, we have fuel tanks
that explode, engines that fall off, lightning strikes that make the
wing fall off to name but a few.

The 737 issue was with the rudder screw. An engine that fell from I
think an AA DC10 was caused by a pylon fitting that was damaged by
a engine refit. Flight 800 fuel tank exploded under extraordinary
conditions and was corrected. As far as lightning taking out a wing,
what flight was that?

Walk around a Boeing assembly plant, or previously an MD plant and you
see workers in casual street clothes, keys hanging off their
waistband, loose items in their pockets. Walk around an Airbus plant
and you see workers in specific work clothes with *no* pockets, with
tight control on personnel access and all losses of hardware being
fully investigated. At Boeing you get birds nesting in the structures
and people eating food, people dropping small items and just picking
another one from a parts bin with no regard for where the stray bits
end up. Look at the number of foreign objects found in nooks and
crannies on Boeing aircraft during their maintenance stripdowns - a
full size sweeping brush FFS! numerous coins, numerous spare
fasteners, a mouldy sandwich, even huge ring binders stuffed with 'QA
documentation'

Didn't an Airbus 310's rudder rip completely off the fuselage a few
years ago. Boeing has been making some pretty reliable military and
civilian aircraft for 60 years. Airbus?

There's something fundamentally wrong
about a plane that has to be flown with a left-handed joystick,

Then sit in the other seat with a right handed joystick.

and which employs a robot driver hidden away somewhere,
which believes it knows more
about how to fly a plane, than the human guy and his chum in the
co-seat,
who have 40 years flying experience between them ... :-\

The robot driver *usually* *does* know more, but not always.

All newer military aircraft depend entirely upon a 'robot' to fly
them. A human can't respond fast enough to fly an aircraft
purposefully designed to be aerodynamically unstable like the
F/A 117, F16, YF 22, F 18/e.

Surely they've reached the 21 century and don't rely on pitot tubes alone.
Surely X,Y,Z GPS with over-the-land interpolated speed which should agree
with the pitot figures when wind speed taken is taken into account.

 

[Arfa Daily]

I heard it was pitot icing which isn't supposed to happen on heated
pitots which all icing condition certified aircraft should have.
Take away that info gather by the pitots and you disable the
aircraft's ability to process flight dynamics. Pitot readings
indicated a lower than normal airspeed, the engines throttle up
and the aircraft then flies too fast for the turbulent conditions
causing a catastrophic failure of the airframe. Decompression occurs
and the airframe breaks apart at FL 330.

Yeah. Lots of interesting stuff coming out now. From today's newspaper --

" ..... investigators said that the Airbus's pilots had no idea how fast
they were flying after sensors iced up and the computer went haywire. The
computer sent 24 error messages and was flying without autopilot or cruise
control. ..... it was not clear whether the autopilot had been switched
off, or had stopped working. Mets said the jet flew into a freak storm with
100mph updraughts that sucked up seawater that quickly froze. .....
said the lack of speed readings meant the pilots would have stalled or used
more power than the jet could take."

Taking N.Cook's point about the Pitot being only one input. This is true,
with there being secondary inputs from the INS and from GPS. However, as the
Pitot data is fundamentally 'mechanical', it is considered the data of
primary reliability. Presumably, the fact that it was (possibly) giving
erroneous readings, should have led to the data from the other two sources
being taken into account, and a two out of three decision made on that
basis, but there may be a software conflict situation arising out of that. I
don't know if that aircraft has one or two tubes, but if it has two, and
they were both icing and giving the same wrong reading, that may have been
enough to screw the decision making process. My flying chum says that as
well as ramping the engines up, if the flight control systems decide that
the airspeed is still not going up, then it may well put the nose down as
well in an effort to increase the speed. Then you are in a full power dive.

The ACARS error messages are purely for advance maintenance purposes, and
are simplistic in that if the pilot switches a system off - such as the
autopilot or the auto cruise control - this will immediately trigger exactly
the same 'error' message as if the system had failed on its own. There is no
distinction between a failure and a deliberate disconnect. Either way, it is
an 'error'. The bad thing is though, that if the system is then switched
back on (or recovers from a temporary fault), this does not trigger a
different message to say it's back on. It is just an error that has now gone
away again.

Another interesting point is that the aircraft took on every last ounce of
fuel that it could, before leaving Rio. Not so much that it was overloaded
out of spec, but much more than it would have needed for the flight with
divert margin. So this might mean that the pilot was aware of the massive
storm on his proposed routing, and was covering for the possibility of
having to go around it. However, all of this extra fuel meant that he could
not attain his filed flightplan cruise altitude of FL370, and was instead,
at a radio approved FL350.

If it does turn out to be down to Pitot icing, and this was a known problem,
I wonder if a charge of corporate culpability will be levelled at Airbus ?

That one that you mentioned where the tail fell off, I seem to recall that
was due to a stress fracture in the composite which was repaired with a
horseshoe of ally rivetted on over it. This is a valid repair technique for
an ally skin fracture, but not for composite. I believe that there are no
approved techniques for repairing this kind of problem, in this kind of
material. Apparently the aircraft that has just gone down, was involved in a
ground collision a couple of years back, when its wing hit the tail of
another aircraft, doing that tail serious damage. I wonder if any unseen
latent damage was done to the Airbus's wing, that then failed in the
turbulence / excess power conditions ?

Arfa

 

[N_Cook]

Returning to lightning , this news report from yesterday - perhaps there
should be a return to thermionic valves for safety reasons

http://news.bbc.co.uk/1/hi/england/dorset/8087964.stm
Page last updated at 14:44 GMT, Sunday, 7 June 2009 15:44 UK

Fishermen rescued in thunderstorm
Poole lifeboat Sgt Bob Martin
The new Poole RNLI inshore lifeboat took part in the rescues

Two fishermen had to be rescued after they became cut off and were unable to
return to shore during a thunderstorm off Dorset.

Relatives of the men, who had been out fishing all day, alerted the
coastguard when they had not returned by midnight.

The Poole RNLI lifeboats located the men's motorboat and dinghy in the
harbour. Their radio, phone and mobiles had been put out by the electric
storm.

They were transferred to the lifeboat and taken back to shore unhurt.

Gavin McGuinness, volunteer helmsman, said: "They did the right thing
staying put. It was the worst conditions I have seen for some time.

"The visibility was poor, the rain was hitting us like ball bearings out of
a machine gun, sheets of rain interspersed by bolts of lightning made
conditions horrendous".

"Huge bolts of lightning bouncing of the water all round the harbour,
lighting up the night skies, it was very close to the boats."

He said the torrential rain had also blanked out the radar.