Originally Posted by
stilton
Don't see the big deal, the landing gear on the 767-400 was raised by 18 inches, cockpit displays were all redone amongst other changes and it was still covered by the 767 type rating.
Not quite sure what you're saying here - yes the 767-400ER was included on the 767 type certificate (as an "Amended Type Certificate" or ATC). But, per the CPR that I described in the previous post, the systems that were updated for the -400 were certified at the then current amendment level - which is documented in that type certificate.
As for common type rating - that's always a major driver when designing a derivative aircraft.
BTW, if anyone is wondering, CPR is harmonized between EASA and the FAA - Airbus is also using CPR for their various NEO projects.