Another update from the AAIB on the Heathrow 777 crash
Posted by: delusional in Automotive, News
The AAIB has released a further update on their investigation into the cause of Boeing 777 crash at London Heathrow.
Boeing 777-236 G-YMMM of the British Airways fleet crashed with no loss of life 300m short of the threshold of 27L at Heathrow on the 17th of January.
In the preliminary report it was established that neither engine responded to either autothrottle commands or manual throttle inputs during the last 40 or so seconds of flight.
The investigation has now revealed that the engines initially responded and then became asymmetric before both engines dropped to a power setting above flight-idle but below the requested setting.
From the report update:
As previously reported, whilst the aircraft was stabilised on an ILS approach with the autopilot engaged, the autothrust system commanded an increase in thrust from both engines. The engines both initially responded but after about 3 seconds the thrust of the right engine reduced. Some eight seconds later the thrust reduced on the left engine to a similar level. The engines did not shut down and both engines continued to produce thrust at an engine speed above flight idle, but less than the commanded thrust.
The full text of the update is available HERE
The AAIB will continue to investigate the accident and while a full report may be many months or even more than a year away, they will undoubtedly update manufacturers and operators of the 777 if they find any critical flaw in the design of the aircraft or systems.
Photo Credit: Adrian Pingstone
Tags: 27L, aaib, boeing 777, crash, fdr, heathrow, undershoot
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