Takeoff alternate suitability time

[arakotoarson]

Hi all,

For destination alternate airport, suitability time is 1 hour before and 1 hour after estimated arrival time, easy to compute.

And how about suitability time for Takeoff alternate airport, does anyone know how is it computed ?

Thanks for your reply !

[+TSRA]

2-Engine aircraft: The distance that can be flown in 60 minutes at the one-engine inoperative cruise speed. 3- and 4-Engine aircraft: the distance that can be flown in 120 minutes at the one-engine inoperative cruise speed, where the operator is authorized for ETOPS flights. Otherwise, it defaults to the 60 minute rule.

[arakotoarson]

Thanks for your reply !

Originally Posted by +TSRA

2-Engine aircraft: The distance that can be flown in 60 minutes at the one-engine inoperative cruise speed. 3- and 4-Engine aircraft: the distance that can be flown in 120 minutes at the one-engine inoperative cruise speed, where the operator is authorized for ETOPS flights. Otherwise, it defaults to the 60 minute rule.