#13 Hydraulics Flashcards
(37 cards)
How many hydraulic systems are there and what is the pressure?
Three independent 5000PSI systems
Left, Center, Right
AOM 13.20.1
The hydraulic systems powers which systems?
Flight Controls Landing Gear Leading Edge Slats Nose Gear Steering Thrust Reversers Trailing edge flaps
AOM 13.20.1
How are the hydraulic reservoirs pressurized?
Pump outlet pressure
AOM 13.20.1
What is the difference between the Left and Right system?
The components they power
AOM 13.20.1
What does the left hydraulic system power?
Flight controls
The left engine thrust reverser
AOM 13.20.1
What does the right hydraulic system power?
Flight controls
The right engine thrust reverser
AOM 13.20.1
How are the left and right hydraulic system primary pumps powered?
Engine-driven
AOM 13.20.1
How are the left and right hydraulic system demand pumps powered?
electric motor-driven
AOM 13.20.1
What do demand pumps provide?
supplementary hydraulic power for periods of high system demand
backup hydraulic power source for engine-driven primary pumps.
AOM 13.20.1
How are the demand pumps controlled?
By the ELEC DEMAND L and R pump selectors
AOM 13.20.1
When the ELEC DEMAND L and R selectors are ON, when does the demand pump run?
Continuously
AOM 13.20.2
When the ELEC DEMAND L and R selectors are in AUTO position, what conditions to the the L and R demand pumps run?
- system low pressure
- on the ground, for the first three minutes after the second engine is started
- from takeoff thrust set to flaps retracted
- during descent and landing, from gear down or RA less than 1000 feet to groundspeed less than 40 knots
- thrust reverser operation
AOM 13.20.2
What does the center hydraulic system power?
Flight Controls Flaps Slats Spoiler (right and left wing) Landing gear acuation Nose gear steering
AOM 13.20.2
What does the ram air turbine (RAT) provide hydraulic power to?
Center hydraulic system primary flight controls
AOM 13.20.2
How many electric motor-driven pumps (EMP’s) provide hydraulic power sources for the center hydraulic system?
Two! C1 and C2
AOM 13.20.2
What do the C1 and C2 ELEC pump selectors control?
Center pump controls
AOM 13.20.2
What do the two center pumps alternate between?
As a primary pump and a demand pump.
AOM 13.20.2
When does the center primary pump operate?
Continuously after the second engine is started.
AOM 13.20.2
When conditions does the center demand pump operate?
System low pressure
or
On the ground for the first three minutes after the second engine is started
or
From takeoff thrust until radio altitude exceeds 2000 feet
or
flaps or slats are in motion
or
during descent when gear lever is down and radio altitude is less than 2000 feet until groundspeed is less than 60 knots.
AOM 13.20.2
What protection does the center hydraulic system have in the event of a leak?
Isolation functionality that ensures the crew can lower the landing gear and that the nose wheel steering is operational for landing, rollout and taxi.
AOM 13.20.3
What does the Isolation function on the Center system use?
Nose gear Isolation Valve (NGIV)
Reserve steering Isolation Valve ( RSIV)
Alternate Extend Isolation Valve (AEIV)
Reservoir standpipe
AOM 13.20.3
How does the crew control the isolation valve for lowering the landing gear?
You don’t. It is automatic.
AOM 13.20.3
If a hydraulic pump is shed, where is this shown?
LOAD SHED is shown on the hydraulic synoptic next to the demand pump symbol.
AOM 13.20.3
What hydraulic power does the RAT provide?
5000PSI to primary flight controls connected to the C hydraulic system
AOM 13.20.3
