Originally Posted by AeroTech
Is the 10 minutes time limit a basic item in all airliners or an option that an airline/operator has to purchase?
It is not a basic item for all airliners but needs to be specifically approved during certification of both the engine and its installation in a particular airplane. I believe approval for engine certification is a formality, but the certification for the airplane requires demonstration of adequate cooling of the engine bay for the longer time. To take advantage of the extended time limit in the scheduling of obstacle-limited take-off weights, you may need additional OEI take-off flight path data for far-away obstacles.
regards,
HN39