BA pilots.
25 May 2009, 09:00 PM
#1
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BA pilots.
After gliding a 777 for a few mile BA 038 at LHR, ladies and gents I give you the flight crew of BA 056. 
32.8ft over the bush.
http://www.pprune.org/rumours-news/3...-incident.html
32.8ft over the bush.
http://www.pprune.org/rumours-news/3...-incident.html
26 May 2009, 12:16 AM
#4
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1)The B747 was very heavy and on rotate one of the engines flamed out, and another "rolled" back to idle RPM.....now on 2 engines only.
2)the thrust reverser light for 2 engines came on, and as per the design features of the B747-436, the leading edge devices retracted.....this is an auto response to prevent F.O.D. to the leading edge devices during reverse thrust operations..... thus even more loss of lift at a very critical phase of flight.
3)thru fast actions the captain was able to restore thrust to the engine that had "rolled back to idle".....but only after leveling off...or even descending doen to 35ft...35ft
4)the aircraft slowly accelerated to climb speed with the partially extended leading edge devices and only on 3 engines.
5)fuel dumping took 2hours
2)the thrust reverser light for 2 engines came on, and as per the design features of the B747-436, the leading edge devices retracted.....this is an auto response to prevent F.O.D. to the leading edge devices during reverse thrust operations..... thus even more loss of lift at a very critical phase of flight.
3)thru fast actions the captain was able to restore thrust to the engine that had "rolled back to idle".....but only after leveling off...or even descending doen to 35ft...35ft
4)the aircraft slowly accelerated to climb speed with the partially extended leading edge devices and only on 3 engines.
5)fuel dumping took 2hours
Good skills! Bit worrying though, look forward to hearing what the full report shows....
Edit - The bits about losing power and flame out seem to be wrong on further reading.
Last edited by Nat; 26 May 2009 at 12:34 AM.
26 May 2009, 07:14 AM
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Yeah, there is some confusion about exactly what happened . Although the height above the bush appears to be accurate. Scary scary stuff.
26 May 2009, 09:50 AM
#7
I was led to belive it was concluded that it was water in the fuel system. Very plausible IMO, as water acumulating in the fuel system of any combustion engine causes havoc.
Obviously who is fault is another issue; plane design not giving enough safe gaurd to trap and drain off accumulated water, tanks that allow excess condensation to accumulate and freeze, or the is the fuel companies at fault for supplying dirty fuel etc. Or maintenance issue regarding purging of any accumulated water in the tanks and fuel system
Last edited by ALi-B; 26 May 2009 at 09:55 AM.
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26 May 2009, 10:52 AM
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That was a very nasty incident with the 747. Looks like the auto retract of the leading edge flaps with the thrust reverser indication is not a very safe part of the automatic systems.
They did very well to cope with what was effectively a double engine failure after takeoff, which the aircraft should be able to cope with according to Performance A, but it was exacerbated by the retraction of the leading edge flaps. Just as well there were no obstructions in the overshoot area.
Les
They did very well to cope with what was effectively a double engine failure after takeoff, which the aircraft should be able to cope with according to Performance A, but it was exacerbated by the retraction of the leading edge flaps. Just as well there were no obstructions in the overshoot area.
Les
26 May 2009, 01:12 PM
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As far as I'm aware, there was no indication that the engines rolled-back on the 747 - the inboard t/r unlocked indications caused the aircraft to retract slats, which resulted in a reduction in lift. ie; the speed required for take-off needed to be greater.
The aircraft returned to Heathrow last week for a thorough systems inspection.
Ref the 777 - reports have been issued. The bun fight over who's responsible still goes on.....
The aircraft returned to Heathrow last week for a thorough systems inspection.
Ref the 777 - reports have been issued. The bun fight over who's responsible still goes on.....
27 May 2009, 11:13 PM
#10
Highly improbable, but I do like it, and the water thing has never hurt any other 777's to this extent doing exactly the same route for how many years.
28 May 2009, 12:27 AM
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There are plenty of reports detailing to progress made with current investigations into the 777 event with G-YMMM on the AAIB website here.
The latest interim report goes into some detail about the icing issues and includes pictures here.
A guy in our office was working on this almost full-time last year, and plenty of work is on-going. Although icing was undoubtedly the cause of the double engine roll-back, the exact circumstances that led to the accumulation of ice, and where the ice sat are still not fully understood. However, there are certain actions that pilots have been advised to take that substantially reduces the already very low chance of a repeat event.
The latest interim report goes into some detail about the icing issues and includes pictures here.
A guy in our office was working on this almost full-time last year, and plenty of work is on-going. Although icing was undoubtedly the cause of the double engine roll-back, the exact circumstances that led to the accumulation of ice, and where the ice sat are still not fully understood. However, there are certain actions that pilots have been advised to take that substantially reduces the already very low chance of a repeat event.
29 May 2009, 04:18 PM
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There are plenty of reports detailing to progress made with current investigations into the 777 event with G-YMMM on the AAIB website here.
The latest interim report goes into some detail about the icing issues and includes pictures here.
A guy in our office was working on this almost full-time last year, and plenty of work is on-going. Although icing was undoubtedly the cause of the double engine roll-back, the exact circumstances that led to the accumulation of ice, and where the ice sat are still not fully understood. However, there are certain actions that pilots have been advised to take that substantially reduces the already very low chance of a repeat event.
The latest interim report goes into some detail about the icing issues and includes pictures here.
A guy in our office was working on this almost full-time last year, and plenty of work is on-going. Although icing was undoubtedly the cause of the double engine roll-back, the exact circumstances that led to the accumulation of ice, and where the ice sat are still not fully understood. However, there are certain actions that pilots have been advised to take that substantially reduces the already very low chance of a repeat event.
Les
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