John
if the FAA didn't concur that the gearbox changes were in compliance, one would assume they would pull the certification. Ergo...
To pull the TC the FAA would have to admit their failure plus it would be open to challenge politically because older helicopters are flying that are as bad.
Another catastrophic oil loss and that would be different.
I'd like to see the TC data sheet state the (at best) partial compliance.
Your Blackhawk claim, which
AFAIK is new, that the type (the fleet size is irrelevant) made nearly an hour is interesting. If so that means the S-92, with a total oil loss is 5 or 6 times worse that the H-60. This just illustrates how big Sikorsky's S-92 design failure was.