Originally Posted by
matkat
Originally Posted by
SLF3
Without wishing to start Boeing versus Airbus debate, does the A350 have the foil in the wings?
The question is only because, if the wing construction is broadly similar and EASA / Airbus require it, that is strong evidence that the FAA should have insisted.
Yes it does, it(The A350) has copper sandwiches embedded in the CRP wing.
Yet, Airbus also finds that it is very difficult to prove that lightning related ignition sources in fuel tanks are
extremely improbable (< 1 x 10^-9).
Back in 2014, they requested from the FAA that the proof of extreme improbability is moved from ignition sources to fuel-tank vapour ignition.
This switch allows to factor the use of inerting gas in the probability calculation.
https://www.federalregister.gov/docu...k-structure-to
As this came after the B787 certification (August 2011), it may be that Boeing wanted to benefit from this change in probability calculation rules.