Auto Speed Brake MEL Performance question
Hi - I am posting this under a new thread title that might attract a performance or certification whizz to respond.
Can you help me understand the MEL weight restrictions imposed by an inoperative automatic speed brake extension?
Each airplane imposes a substantial penalty to landing runway limit weight but no penalty to takeoff runway limit weight. The amount of landing penalty and lack of takeoff penalties are counterintuitive. Examples include:
757: 25,000lb landing penalty, but no takeoff penalty
767: 63,000lb landing penalty, but no takeoff penalty
How were these penalties calculated?
Thanks for any thoughts
OH