Hydraulics Flashcards
Which pumps supply normal hydraulic
power to the hydraulic system
The 3 A pumps which operate
continuously
How many ACMP’s may be operating
on the ground while on APU power
One
Which hydraulic systems are powered
by engine driven pumps
Systems 1 and 2 by 1A and 2A
How is the hydraulic reservoir quantity
accurately checked before eng. start
Turn on the B pump to pressurize
the system
What is the priority for the ACMP’s
3A - 3B - 2B - 1B
When the ACMP is set to AUTO,
When will the pump start
Either slats or flaps not IN / 0, motion stopped,
and at least one eng. gen. operating
system 1 or 2 low pressure detected
Gear down
In flight, when system 1 or 2 low pres. detected, how long will the B pumps operate once activated
minimum of 5 minutes
What ways can the
EDP HYD SOV
be closed
selecting the HYD SOV
switch closed
Pulling the fire discharge
handle
What are the electrically driven pumps
and associated AC buses
1B - AC bus 3
2B - AC bus2
3B - AC bus 1
3A - AC bus 4
What is the normal RAT accumulator
pre-charge pressure
1000 psi
What is the normal hydraulic system
brake accumulator pre-charge pressure
500 psi
How is hydraulic fluid
cooled prior to
returning to reservoir
Heat exchangers in
wing tanks
note:
Left wing
system 1 and 3
Right wing - system 2
Which hydraulic pumps are
available / operating during single
generator operations in flight
Engine pumps 1A and 2A
AC pumps 3A and 3B
Note:
1B and 2B are shed due to
buses being shed
