golfyankeesierra
I don't think the batterymalfunction is the root cause the FAA is reconsidering; it merely wakens them up that they have certified a brand new aircraft to ETOPS right from the start, without it proving itself in line flying.
They certified the 777 as suitable for ETOPS-180 before the first revenue flight took off from Dulles for Heathrow.
And it's assumed EASA will certify the A350 as suitable for ETOPS-180 before the first revenue flight departs Doha, so should the FAA break tradition and not accept EASA's certification suitability until the A350 accumulates sufficient flight hours to "prove itself"?
And we should remember that the 787 did fly for over a year without major incident, so how long is long enough when it comes to proving oneself with flying? For the Japanese, it was a year, and once the 787 met that requirement, they allowed NH and JL to operate it on missions with ETOPS-180.