Originally Posted by
oicur12.again
Interesting. I'm wondering what sort of failure would result in a return to normal operation after waiting several minutes particularly having established that the FSEU removes hydraulic power when asymmetry or skew is sensed.
….
Does this imply the lever must remain at position 2 or is it permissable to place the lever at 0 for the diversion in order to retract all LE devices.
Cheers.
There is NO “returning to normal operation after waiting several minutes” with a flap assymetry. When an assymetry is detected, the trailing edge bypass valve
closes and normal trailing edge flap operation is
NOT possible. The valve can only be re opened on the ground by maintenance.
There are 3 parts to this checklist.
1. position flap lever (drives speed tape to correct position).
2. DONT USE ALTERNATE FLAP EXTENSION/RETRACTION.
3.pick a speed to land at (or if lever up do flap up checklist).
In terms of moving the flap lever to try and retract leading edge devices - NO, do not overthink this. The instructions to place the flap lever in a particular position is so it drives the speed tape correctly. Boeing has thought long and hard about this. Just do what it says.