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17 Cards in this Set

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How many hydraulic systems are on the airplane?
3
What systems use hydraulic power?
Flight controls
Spoilers
Landing gear
Nosewheel steering
Brakes
Thrust reversers
Can hydraulic fluid be transferred between systems?
No
How many hydraulic pumps are on the airplane?
6 total
2 Engine driven
4 AC
What are the basic components of the hydraulic systems
Reservoir
Pumps
Accumulator
What is the purpose of the accumulator?
Maintains constant pressure by covering transient demands

Avoids pump cavitations
When will ACMP 1 or 2 automatically activate?
Ground
Flaps >0 and
T/L set to T/O or
Groundspeed >50 knots
Flight
Engine or EDP failure
Flaps >0
What are some important items controlled by HYD 2?
Landing gear
Nosewheel steering
Inboard brakes
What is the PTU?
Power Transfer Unit

Mechanical pump that uses HYD 1 power to provide HYD 2 pressure
What is the primary purpose of the PTU?
To allow landing gear retraction in the event of an engine 2 or EDP 2 failure
When will the PTU automatically activate?
During t/o and landing with flaps >0 if
Engine 2 fails or
EDP 2 fails
How is single engine taxi possible if nosewheel steering is on HYD 2?
Releasing the parking brake activates ACMP 2
What is the primary purpose of HYD 3 system?
Backup for the flight controls
Why are HYD ACMP 3A & 3B pump switch positions ON & AUTO respectively?
3A is primary and has no automation

3B is a backup and automatically activates if 3A fails
Which HYD ACMP will function if the RAT is the only power source?
3A only
In an electrical emergency what provides hydraulic pressure to flight controls until the RAT comes online?
HYD 3 accumulator

After 8 seconds the RAT will power ACMP 3A
In an electrical emergency can the HYD 3 system power requirements overload the RAT?
No. A flow limiter valve is used to reduce flow and limits pump electrical power draw to prevent a RAT stall