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232

Boeing faces fresh safety questions after engine fire on flight from Scotland (www.theguardian.com)

submitted 4 months ago by girlfreddy@lemmy.ca to c/world@lemmy.world

22 comments fedilink hide all child comments

Boeing faces fresh questions about the safety of its aircraft after an engine fire on a transatlantic flight from Edinburgh caused an emergency landing soon after takeoff.

Flames were seen by passengers briefly shooting from the engine of a Delta Air Lines 767 soon after it took off for New York in February last year, after a turbine blade broke off during takeoff.

The flames subsided while the plane was airborne but it made an emergency landing at Prestwick airport south of Glasgow, where ground crew noticed fuel leaking from the plane’s right wing.

The Air Accidents Investigation Branch, the UK government agency that investigates aviation safety, has written to the Federal Aviation Administration in the US asking it to take action with Boeing, which has its headquarters in Virginia.

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[–] girlfreddy@lemmy.ca 52 points 4 months ago (1 children)

Nobody is accusing Boeing for the turbine failure. They are questioning Boeing's drain tube track design failure. Source

According to the (Air Accidents Investigation Branch) AAIB, a high-pressure turbine blade had "fractured" in the 767's right engine, damaging a further five blades.

Vibrations from the "out of balance" turbine led a section of the wing to rupture, causing fuel to leak out, which was then ignited by the engine's exhaust.

The AAIB's report questioned why the vibrations from a broken engine were sufficient to fracture the Boeing 767's "slat track housing drain tube."

At the end of its report, the AAIB said: "It is recommended that the Federal Aviation Administration requires the Boeing Airplane Company to demonstrate that following this serious incident, the design of the slat track housing drain tube on the Boeing 767 family of aircraft continues to comply with the certification requirements for large transport aircraft."

[–] Zipitydew@sh.itjust.works 6 points 4 months ago* (last edited 4 months ago)

The new design was vibration tested for five hours both laterally and vertically without failure and the system had a first mode resonant frequency response at 170 Hz and a second mode at 260 Hz. Analysis of the drain tube at 165 Hz demonstrated that with a 5g or 10g input load, the drain tube would fracture after either 200,000 or 21,000 fatigue cycles respectively, at the bend adjacent to the slat track housing. This equates to approximately either 20 minutes or 2 minutes of operation.

Doesn't seem to be major issue there either. Above is a quote from the AAIB report. They're talking about an already redesigned and upgraded drain this plan had installed in 2012. It was found the redesigned part performed better than required. Even when damaged on purpose before testing. The recommendation here is more like hey FAA maybe you should update the test requirements. 20 minutes or 2 minutes of holding up while shit is going wrong might not be enough.

https://asn.flightsafety.org/wikibase/308139

But even with all this going on the engine was making thrust. Pilot was just worried about flying across the Atlantic with a vibration they noticed was getting worse after 20 minutes in the air. They suspected but didn't even know the engine was blown until back on the ground. The fire was happening in the exhaust stream and not within any part of the plane itself.