Ethiopian Airlines 787 fire investigation last week, officials are concentrated in London and possible condensation in the plane filigree EPIRB, may lead to fire, according to people familiar with the probe.
The Federal Aviation Administration said on Friday it will call by Honeywell Boeing 787 airliner beacon check, but, halted require airlines to disable or remove the equipment, the UK authorities to investigate the fire proposal.
The FAA said inspections should ensure proper wire routing and should look filigree or unusual signs of moisture or heat. It gave no further details of how these factors may result in fire.
However, informed sources have told Reuters reporters said inquiry, investigators have found a filigree aboard the aircraft's emergency locator transmitter (ELT) shell.
After the message is a British Air Accident Investigation Bureau (AAIB) said on Thursday that it is possible to Honeywell beacon fire, but said it was still trying to understand what ignited the plane.
July 12 fire rekindled concerns of the industry about Boeing's advanced carbon composite dream after two incidents involving lithium-ion battery to overheat, which is more year and three months, this kind of ground. AAIB said the Great Fire of London is not with these batteries.
Honeywell ELT fully assembled and installed by Boeing delivered. Units involved in the fire, was not open, prompting filigree Honeywell plant origin, according to a person familiar with the investigation.
Honeywell declined to comment. Boeing's investigation, but declined to comment, said it was working with airlines inspect or remove the beacon, in order to meet regulatory guidelines.
The researchers also are trying to determine whether the aircraft condensation infiltrated English teaching, triggering cell lithium manganese battery short circuit, which is made Ultralife companies, according to people familiar with the investigation. Source unauthorized speak publicly because the probe continues.
In all large aircraft condensation is normal, but the 787 has a higher longer, so that passengers more comfortable humidity levels, about 15% of the 787 with a 4-5% compared to traditional metal aircraft, Boeing said. On any flat surface when the door is opened on the ground, perhaps 95%, as it is consistent with the humidity of ambient air will be much higher. Cruising altitude, but the air-drying, moisture mostly from passengers.
Water conductivity, high moisture content can increase the possibility of a short circuit. Long-term exposure to moisture can lead to corrosion of wires and batteries.
"ALL AVENUES"
Boeing 787's chief engineer, told Reuters 迈克辛尼特, 787 humidity controller by CTT Systems AB in Sweden, the purpose is to "dry out the crown" or the upper fuselage of the aircraft, and to prevent moisture accumulation. Without the system, "We will wind there is water left in the insulation."
Sinnett said aircraft design against corrosion, CTT system's main purpose is to eliminate the water, because the water cut (by weight) of fuel efficiency.
He declined to comment on the AAIB ongoing probe, but said any investigation, "in all possible ways to go and see."
AAIB also looking for ELT, which is bolted to the plane of the frame bracket position - exactly where condensation build one of the sources said.
"Condensation, humidity and installation - this is the focus of the investigation," the source said.
ELT must pass tests to demonstrate that it can be submerged in one meter of water for one hour. It is unclear what kind of impact, any long-term accumulation of condensation on the device on the plane, which is mounted on aluminum, its battery sources.
ELT need by the U.S. aviation regulations, but some state regulations.
Boeing spokesman Marc Birtel said, all 68 Boeing 787 aircraft in operation, because all airlines customers beacons select this option. Boeing aircraft beacon installed in different areas, depending on the airline's preferences and their own regulations.
Birtel said this week that Boeing has no plans to change suppliers, the company will "continue to work with researchers and regulatory agencies to develop acceptable mitigation actions, if necessary."
In ELT non-rechargeable lithium - manganese battery has been used in products such as digital cameras and pacemakers few decades, because of its long life.
Last week, the fire came less than three months later, Ethiopian Airlines and other new all-composite aircraft return to flight after the FAA grounded.
The researchers are also looking at what kind of impact, there may be a long grounding in aircraft batteries and electrical systems, said one of the sources.
Ethiopian Airlines aircraft sit on the outside of Africa raise the question of whether that may affect battery locator beacon, said the source.
Two sources stressed that investigators are continuing a comprehensive review of the various components and issues. But they said that the aircraft wiring on the humidity and the complex interactions, is a clear focus.
One source, who is close to the 787 said it might be a need for better isolation of electrical components.
Investigators have not determined what prompted the lithium-ion battery in front of the fire from overheating. Boeing solved this problem by redesigning the batteries to prevent heat buildup better, fireproof steel box packing them in the vent in the plane cutting dumping smoke and heat away from the passengers.
 



Other News:
UBS in settlement with US over mortgages
Verizon posts strong device additions in 2Q
Boeing 787 probe looks at condensation, wiring
Blast during sermon by radical Myanmar monk wounds 4
Opponents of Dell buyout say don't delay vote
Aurora victims honored, gun groups stage protest
U.S. launches push to boost women's role in Afghanistan
World powers see Iran's Rouhani as chance for nuclear deal