Originally Posted by
eckhard
The 787-9 MLG doors open at lift-off and close after gear retraction or 30 seconds (?) whichever is first. It's a way of reducing the time taken for the gear to retract in the event of EFTO, the thereby reducing the time spent in the 'first segment'
What about wind shear after takeoff? The whole reason you don't raise the gear in windshear (even though it's creating a load of drag) is because first of all the gear doors have to open temporarily increasing drag. So I guess their procedure is different. Might as well raise the gear as the doors are already open?