Hydraulics Flashcards
Normal operating pressure?
3,000 psi
Where are system 1 & 2 serviced?
Aft equipment bay
How many pumps does each system have?
2:
Main pump A (EDP - 1A/2A)
Backup pump B (ACMP - 1B/2B 3A/3B)
How many hydraulic systems?
3
Which of the 3 is the largest?
3
Which of the 3 is the smallest?
1
System 1 powers:
(Refer to picture)
RUDDER ELEVATOR L AIL OB SPLRON OB FLT SPLRS OB GND SPLRS L REVERSER
System 2 powers:
Refer to picture)
RUDDER ELEVATOR AIL R IB SPLRON IB FLT SPLRS IB GND SPLRS LG ALT EXT OUTBD BRAKES REVERSER R
1A/2A are running when:
The associated engine is running
Do 1B/2B auto start after engine/EDP failure?
No
System 1 & 2 cooling cooled by:
Cooled by common air/oil heat exchanger in aft equipment bay (air from ram air scoop moves across heat exchanger)
What 2 switchlights close the Hydraulic Shutoff Valve?
HYD SOV
ENG FIRE PUSH
How are 3A/3B actuated?
Electrically
How often does 3A normally run?
Continuously
System 3 is serviced where?
Ground service panel, right side of fuselage, aft of wing root
When does 3B normally run?
During periods of high-flow requirement
Which pump is automatically powered during AC power failure?
3B
What do the hydraulic systems power?
- rudder
- elevators
- ailerons
- multifunction spoilers
- ground spoilers
- thrust reversers
- wheel brakes
- nosewheel steering
- landing gear
What kind of hydraulic fluid?
Skydrol
Main pumps (A) meet needs of:
Normal flight controls
Auto Mode causes 1B/2B to operate when:
- their respective bus is powered
- any generator operating
- flaps not at 0
During Manual Mode, 1B/2B operate when:
- their respective bus is powered
- any generator is operating
Where is hydraulic info displayed?
Hydraulic Synoptic Page
How many reservoirs/accumulators?
1 per system
System 3 powers:
Rudder & Elevator L & R Ailerons IB GND SPLRS LDG GEAR NW STEERING INBD BRAKES
Does system 3 use a heat exchanger?
No
Does 3B auto start after 3A failure?
No
3B Auto Mode: Activated when:
- Associated bus is powered
- Flaps not at 0
Are there any flight deck controls for EDP1/2?
No
Reservoir quantity?
45-85%
Low pressure?
<1800 psi
High pressure?
3200 psi
Pressure relief occurs at:
3750 psi
High temp?
> = 96 C
How many accumulators?
5 (1 for each system, 1 for each brake system)
What color is the hydraulic fluid?
Purple
How many systems actuate the elevator, rudder, & ailerons?
All 3
Stab trim rates & priority:
CA: .5 deg/sec
FO: .5 deg/sec
AP: .5 deg/sec (flaps in motion)
.1 deg/sec (flaps stationary)
Mach trim: .03-.06 deg/secSystem 3 powers:
(Refer to picture)
RUDDER ELEVATOR L AIL R IB GND SPLRS LDG GEAR N/W STEER
