A320 Landing Gear
 

Can normal landing gear operation be restored after a gravity extension if green hydraulic pressure is available?

A. It may be possible if the gravity extension was not caused by a failure of the landing gear mechanism.
B. No, only maintenance can restore normal operation.
C. Restoration is always possible.

lokeshm11
It can be restored in the air with hydraulics available. It is routinely done in training flights provided everything else is normal.