737NG PTU
Something I don't get about the 737NG PTU..
1. The PTU is only used when Engine #2 EDP is lost to provide the extra volume of hyd fluid required to retract the Leading Edge devices.
2. The PTU itself is powered by Hyd System A pressure.
3. The Hyd B reservoir has a hole in the very bottom of the reservoir that is used to supply the PTU.
Question is then: Why does the Hyd B reservoir supply anything to the PTU? I thought only Hyd A pressure is used to power the PTU.
Does the PTU provide hydraulic pressure directly to the LE devices via its own separate line???
That's the only reason I can think of why the Hyd B reservoir would supply fluid to the PTU.