Investigators In London Probe Boeing 787 Fire

In London, investigators are still probing the cause of a fire last week on a parked Boeing 787, known as the Dreamliner. One area of interest is the emergency locator transmitter. The device is made by Honeywell, which has sent a technical team to assist in the investigation.

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Investigators in London are continuing to probe the cause of last Friday's fire onboard a parked Boeing 787 - the plane known as the Dreamliner. They're examining what role the emergency locator transmitter might have played.

That device is made by Honeywell and as NPR's Wendy Kaufman reports, the company has sent technical experts to assist in the investigation.

WENDY KAUFMAN, BYLINE: The emergency locator transmitter, or ELT, sends out a digitally encoded signal after a crash and, says aviation analyst Scott Hamilton...

SCOTT HAMILTON: Search teams would rely on the signals emitted from the ELTs, to locate the airplane.

KAUFMAN: These emergency beacons are on every commercial jet. In a statement, Honeywell says its ELT was certified by the FAA in 2008, and there haven't been any reported incidents with the device. It's powered by a very small, non-rechargeable, lithium manganese battery. It's normally quiet and not doing anything while a plane is parked.

This investigation comes roughly three months after the 787s were returned to service after being grounded because of serious problems with a different kind of battery. Investigators have said those lithium ion batteries are not implicated in this incident.

Aviation expert Hans Weber says while we still don't know how this fire started, humans have been to blame for fires on other parked jets.

HANS WEBER: Somebody smoking a cigarette illegally on the aircraft and not extinguishing the cigarette properly, or somebody leaving something on the hot plate, or somebody doing a repair job and causing a fire to smolder - without noticing it.

KAUFMAN: Investigators are expected to have a least some answers in a matter of days.

Wendy Kaufman, NPR News.

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