BA 777 crash at Heathrow

Big John wrote in
:

On Fri, 18 Jan 2008 02:59:24 +0000 (UTC), Bertie the Bunyip
wrote:

"Ridge" wrote in
:


I saw one report that said the pilot reported loosing all
electronics
on final.

Well, the news, ya know?

If they lost both engines they would have lost a lot of electrics
unless
they had the APU runnning, which they would not have done most likely.


Bertie


------------------------------------
Bertie

Whar rpm would the 777 engines windmill on final approach speed if you
know.

Well, modern jets are all expressed in percentage ( TO RPM would be
about 100%) You'd be looking at around 60% N1 when you're dirty and
stabilised, and they would have been so at 600'.

Also what RPM would the generators/alternators drop off line?

Pretty low. They have a constant speed drive to keep the freq steady and
that can cope down to about 45% N2 ( I think it's a two spool engine,
but it might be three) You lose a genny pretty quickly after an engine
failure. The APU door was open, so they may have been runing it for the
approach, or they may have tried to start it after the failure, but I
reckon that at 600 feet they had other things on their minds than a few
clocks going black.

Do any of those brds have a RAT?

Yeah,It should be on the right wing root just behing the leading edge.
It'll run hydraulics and electrics. The airplane also has battery power
to provide both essential DC and AC for probably an hour and a half as
well. I was talking briefly to a friend who flies the 777.
They have a lot of additional generators dedicated to the computers. Of
course if they engines aren't running you won't have those either, but
something provided enough for the flight controls, it appears, or they
would have had no control. So something was making sparks.


Bertie

Bertie

------------------long clip-----------------------

I have time in C-130, C-121 and C-141 but nothing in the modern Jet
transport airliners. Weren't around when I retired.

Want to thank you for the Tech data you gave in basic post that I
clipped to save space.

I ask lots of questions and learn something new every day.

What bird do you normally fly or are you multiple currently qualified?

Big John

On 2008-01-18, Blueskies wrote:
What the heck happened? Fuel starvation?

They've already ruled that out (or at least, they've ruled out fuel
_exhaustion_).

--
From the sunny Isle of Man.
Yes, the Reply-To email address is valid.

"Dylan Smith" wrote in message ...
On 2008-01-18, Blueskies wrote:
What the heck happened? Fuel starvation?

They've already ruled that out (or at least, they've ruled out fuel
_exhaustion_).

--
From the sunny Isle of Man.
Yes, the Reply-To email address is valid.

Didn't look like much if any fuel was spilled, even with the big hole in the wing. Didn't see any evidence of fire
either. Does BA use a fuel tank inerting system on these 777s?

I can't imagine what would cause loss of power to both engines at the same time...

Blueskies,

Didn't look like much if any fuel was spilled,


Well, the AIB reports a lot of fuel being spilled.

--
Thomas Borchert (EDDH)

Blueskies wrote:
What the heck happened? Fuel starvation? Doesn't sound like wind shear could have been an issue.

http://seattletimes.nwsource.com/htm...inplane17.html






BBC America reported a second hand report that the pilot said that all
power was loss.

On Jan 18, 6:25*am, Gig 601XL Builder
wrote:
Blueskies wrote:
What the heck happened? Fuel starvation? Doesn't sound like wind shear could have been an issue.

http://seattletimes.nwsource.com/htm...30291_apbritai...

BBC America reported a second hand report that the pilot said that all
power was loss.


Here's a link I found that may give some insight... From my side, I'm
just glad that everyone made it off the plane okay.
http://money.cnn.com/news/newsfeeds/...3-22365773.htm


Warmest Regards,

Jeff

wrote:
On Jan 18, 6:25 am, Gig 601XL Builder
wrote:
Blueskies wrote:
What the heck happened? Fuel starvation? Doesn't sound like wind shear could have been an issue.
http://seattletimes.nwsource.com/htm...30291_apbritai...
BBC America reported a second hand report that the pilot said that all
power was loss.


Here's a link I found that may give some insight... From my side, I'm
just glad that everyone made it off the plane okay.
http://money.cnn.com/news/newsfeeds/...3-22365773.htm

Yes, it is great that nobody was hurt. I see the engines for R-R so
that keeps the investigation close to home also. I have to admit that
I've become a more nervous airline passenger as modern airplanes have
become even more computer controlled. I never should have started out
with a CS degree! :-)

Matt

Matt Whiting wrote in
:

wrote:
On Jan 18, 6:25 am, Gig 601XL Builder
wrote:
Blueskies wrote:
What the heck happened? Fuel starvation? Doesn't sound like wind
shear could have been an issue.
http://seattletimes.nwsource.com/htm...130291_apbrita
i...
BBC America reported a second hand report that the pilot said that
all power was loss.


Here's a link I found that may give some insight... From my side, I'm
just glad that everyone made it off the plane okay.
http://money.cnn.com/news/newsfeeds/...-0013-22365773
.htm

Yes, it is great that nobody was hurt. I see the engines for R-R so
that keeps the investigation close to home also. I have to admit that
I've become a more nervous airline passenger as modern airplanes have
become even more computer controlled. I never should have started out
with a CS degree! :-)


Well, RR engines are crap anyway. I've flown them on two types. They;re
needlessly complicated, labor intensive to maintain and they leak oil
everywhere,including into the cabin.
The failure rate is low, however.. I haven't yet flown anything that
doesn't have manual reversion on the throttles, but most airplanes built in
the last ten years or so are straight FADEC.

Bertie

On Jan 19, 7:14 pm, Bertie the Bunyip wrote:

Well, RR engines are crap anyway. I've flown them on two types. They;re
needlessly complicated, labor intensive to maintain and they leak oil
everywhere,including into the cabin.


Bertie, by 'cabin', do you mean the portion of the turbine that houses
the vanes?

Ramapriya