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The UK's Air Accidents Investigation Branch said the initial investigation was likely to take several days. It said it had found "extensive heat damage in the upper portion of the rear fuselage, a complex part of the aircraft". "However, it is clear that this heat damage is remote from the area in which the aircraft main and APU (Auxiliary Power Unit) batteries are located and at this stage there is no evidence of a direct causal relationship."
Originally posted by Zaphod58
reply to post by solidshot
It's possible this is an APU issue too. They recently said that the APU was overheating as well. It's located in the rear near the batteries.
@WSJ Breaking: Investigators are probing Boeing 787's emergency locator transmitter as a potential cause in Heathrow fire
"Our ELT products have been certified by the [US Federal Aviation Administration] since 2005, are used on a number of aircraft models, and we've not seen nor experienced a single reported issue on this product line," the company adds.
Honeywell also supplies the emergency lighting system, terrain awareness warning system, navigation system and nacelle anti-ice regulators on the 787. But only the ELTs are known to be situated in the area immediately proximate to what Honeywell describes as damage from a "fire".
The AAIB statement said: "Detailed examination of the ELT has show some indications of disruption to the battery cells. It is not clear however whether the combustion in the area of the ELT was initiated by a release of energy within the batteries or by an external mechanism such as an electrical short."
As the ceiling space where the ELT is located "do not typically carry the means of fire detection... had this event occurred in flight it could pose a significant safety concern and raise challenges for the cabin crew in tackling the resulting fire."
The U.K. Air Accidents Investigation Branch (AAIB) is asking the FAA to turn off the Honeywell emergency locator transmitters (ELTs) in all Boeing 787s “until appropriate airworthiness actions can be completed.”
The action comes as the AAIB continues to investigate a July 12 “fire event” onboard an Ethiopian Airlines 787-8 that was unoccupied and unpowered on Stand 592 at London Heathrow Airport.
“The initial technical investigation confirmed extensive heat damage in the upper portion of the rear fuselage, with significant thermal effects on aircraft insulation and structure,” says the AAIB in a special bulletin released today.
Investigators determined that the most severe heat damage and highest temperatures were close to the crown of the fuselage on the left side of the aircraft, which coincides with the location of the aircraft’s ELT and its wiring that is mounted internally on structure close to the aircraft skin.
@Bruciebabe Quatar Aitways B787 smoke incident in Doha (A7-BCB). Unconfirmed reports say smoke from the rear equipment bay. APU