B737 NG PTU and LGTU
With a loss of hydraulic B the PTU uses system A to power the LE devices. Does this just use system A pressure or does it actualy use system A fluid?...(think its just pressure but not sure)
Equaly with loss of system A, System B powers the LGTU to enable normal gear retraction (with a few specific requirements). Does this just once again use the B pressure to raise the gear or does it actualy use B fluid?