Hydraulics Flashcards
1
Q
Normal HYD sys pressure?
A
3000 PSI
2
Q
Define PTU
A
Bi directional power transfer unit
3
Q
When does PTU operate?
A
Diff pressure between G and Y >500PSI
4
Q
When is PTU tested?
A
During second engine start
5
Q
When is PTU inhibited?
A
During first engine start
6
Q
Which hydraulic systems have a fire shut off valve?
A
Green and Yellow
7
Q
Why are hydraulic pumps pressurised?
A
Prevent pump cavitation
8
Q
Purpose of the accumulator
A
Assists in maintaining constant pressure during normal operation
9
Q
Priority valves
A
Hydraulic cut off valve.
If the pressure is low they cut off hydraulic pressure to high load users such as flaps/slats for, landing gear to maintain operation of essential flight controls.
10
Q
HYD sys quantities
A
G 14.5 L
Y 12.5 L
B 6.5 L
11
Q
HYD Quanitty low level
A
G/Y 3.5 L
B 2.4L
