Intentional selection of the thrust reversers in flight is?

Prohibited

Do not extend flaps above?

20,000' pressure altitude

What is the alternate flap duty cycle in flight?

One complete cycle, then 5 minutes off. (A complete cycle is movement from position 0° to 15° and back to 0°) The ALTERNATE FLAPS position switch must be in the OFF position for 15 seconds before reversing the direction of flap movement