Grounding av 787

[Frequent Traveller]

NTSB naermer seg avlevering av endelig teknisk rapport, som avventes til engang i mars mnd (fra Reuters) :

http://news.airwise.com/story/view/1389218484.html

 

[Frequent Traveller]

NTSB har avlagt rapport i 787-batterisaken. FAA's sertifiserings-prosedyre spesielt for sikkerhet ved bruk av Li-Ion batterier i fly er anmeldt som ikke tilfredsstillende. Den säkalte "spiker-testen" er anmeldt som ubrukelig for det den sikter ä teste ...

http://www.flightglobal.com/news/ar...valuate-risk-on-lithium-ion-batteries-399649/

Kort referat :

The NTSB also discovered that other federal agencies were aware that a nail-penetration test would not conclusively ensure that a failure in one of lithium ion’s cells would not cause a chain reaction in other cells, called a thermal runaway.
The FAA instead relied exclusively on Boeing’s expertise to approve the lithium ion battery. As a result, the FAA should consult a panel of independent experts when considering how to determine the safety of new technologies, the NTSB says.
The FAA also approved Boeing’s solution to the battery crisis in 2013. Rather than switch to a new battery design, the FAA lifted the 787 grounding order after Boeing installed a kit aimed at preventing a thermal runaway event from causing damage to the rest of the aircraft. The battery cells are spaced farther apart and are contained within a stainless steel box with a vent used to channel any escaping fumes directly out of the aircraft.
But the NTSB also urges the FAA to “re-evaluate internal short circuit risk for lithium ion batteries now in-service”.