Hydraulics COPY

Question 1

When is the PTU inhibited?

Answer 1

Parking brake off and n/w steering disconnected
If only one engine master is set to on
During cargo door operation or yellow hand pump use and 40s afterwards
PTU pushbutton set to off

FCOM hydraulics

Question 2

Which systems have hydraulic priority and how does this work?

Answer 2

Primary flight controls have priority and each hydraulic system has a priority valve to cut off high power users (gear, flaps, slats, emergency generator) if the system pressure gets too low.

FCOM