Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

FCOM NG System Description > 13. Hydraulics > Flashcards

13. Hydraulics Flashcards

1
Q

Engine Hydraulic Pump Switch

A
  • ON: De-energizes blocking valve in pump to allow pump pressure enter system,
  • OFF: Energizes blocking valve and isolates fluid flow from the system components,
  • However the EDP continues to rotate as long as the engine is operating,
  • Should remain ON at shutdown to prolong solenoid life
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

HYDRAULIC System QUANTITY Range

A

0-106%

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

HYDRAULIC System PRESSURE Indications

A
  • Normal: 3000psi,
  • Maximum: 3500psi,
  • When pumps OFF: Normally less than 100psi
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

RF Indications

A
  • Refill shows when hydraulic quantity < 76%,
  • Valid only when airplane on ground with both engines shutdown or,
  • After landing with Flaps Up during taxi-in
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

FLIGHT CONTROL Switches

A
  • STBY RUD: Activates Standby Pump and opens Standby Rudder SOV to pressurize Standby Rudder PCU,
  • OFF: Closes Flight Control SOV isolating ailerons, elevators
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

Flight Control LOW PRESSURE Lights Deactivation

A
  • When associated FLIGHT CONTROL switch is positioned to STBY RUD,
  • And Standby Rudder SOV opens
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

STANDBY HYDRAULIC LOW QUANTITY and LOW PRESSURE Lights

A
  • LOW QUANTITY: Always armed, illuminates when the reservoir approximately half empty,
  • LOW PRESSURE: Armed only when standby pump is operating
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

ALTERNATE FLAPS Master Switch

A

ARM:
- Closes Trailing Edge Flap Bypass Valve,
- Activates Standby Pump and,
- Arms ALTERNATE FLAPS position switch

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

STBY RUD ON Light

A

Standby hydraulic system is commanded to pressurize the Standby Rudder PCU

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

Hydraulic Fluid Reservoirs

A
  • Located in the Main Wheel Well area,
  • Pressurized by bleed air,
  • Standby reservoir connected to System B reservoir
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

Hydraulic System Joint Powered Components

A
  • Ailerons, rudder, elevator,
  • Elevator Feel,
  • Flight Spoilers (A 2, 4, 9, 11 / B 3, 5, 8, 10)
  • Thrust Reversers (A1, B2),
  • Autopilot
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

Only Hydraulic System A Powered Components

A
  • Ground Spoilers (1, 6, 7, 12),
  • Alternate Brakes,
  • Normal Nose Wheel Steering,
  • Landing Gear,
  • Landing Gear Transfer Valve,
  • Power Transfer Unit
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

Only Hydraulic System B Powered Components

A
  • Leading Edge Flaps and Slats,
  • Trailing Edge Flaps,
  • Normal Brakes,
  • Alternate Nose Wheel Steering,
  • Landing Gear Transfer Valve,
  • Autoslats,
  • Yaw Damper
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

Hydraulic System Pumps

A
  • Engine Driven Pumps supplies approximately 6 times more fluid volume than Electric Motor Driven Pumps,
  • Loss of an EDP and high demand may cause LOW PRESSURE for EMDP and Flight Control LOW PRESSURE light,
  • EMDP powered by AC power,
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

Hydraulic Fluid Cooling

A
  • Passes through Heat Exchanger located in Main Fuel tanks (1 for A, 2 for B),
  • Minimum fuel for ground EMDP operation is: 760KG in the related Main Tank
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

Hydraulic Leaks

A

System A:
- If EDP or its related lines: Standpipe prevents total loss. Quantity shows 20% full,
- EMDP maintains System A pressure,
- If EMDP or its related lines or joint lines: All system pressure is lost

System B:
- If either pump, line or component: Quantity indicates approximately zero,
- Standpipe provides enough fluid for Power Transfer Unit operation,
- Leak does not affect Standby Hydraulic operation

Standby:
- Quantity decreases to zero,
- System B fluid level indication decreases and stabilizes at 70% full

17
Q

Power Transfer Unit

A
  • Supplies the additional volume of hydraulic fluid to operate Autoslats and LE Flaps & Slats at normal rate,
  • When System B EDP is inoperative,
  • Uses System A pressure to power a hydraulic motor driven pump,
  • Which pressurizes System B hydraulic fluid
18
Q

PTU Automatic Operation Conditions

A
  • System B EDP pressure drops below limits,
  • Airborne,
  • Flaps “1, 2, 5, 10” or for SFP aircraft not UP
19
Q

Landing Gear Transfer Unit

A
  • Supplies volume of hydraulic fluid to raise the Landing Gear at normal rate,
  • When System A EDP volume is lost,
  • System B EDP supplies the required the volume of hydraulic fluid to operate Landing Gear Transfer Valve,
20
Q

LGTU Automatic Operation Conditions

A
  • Airborne,
  • No. 1 Engine RPM drops below a limit value,
  • Landing Gear Lever is UP,
  • Either Main Landing Gear is not up and locked
21
Q

Standby Hydraulic System Powered Components

A
  • Thrust Reversers,
  • Rudder,
  • Leading Edge Flaps and Slats (extend only),
  • Standby Yaw Damper
22
Q

Standby Hydraulic System Manual Operation

A

By positioning either FLT CONTROL switch to STBY RUD:
- Allows Standby System to power: the Rudder and Thrust Reversers

By positioning ALTERNATE FLAPS switch to ARM:
- Allows Standby System to power: LE Flaps and Slats

23
Q

Standby Hydraulic System Automatic Operation

A
  • Loss of System A or B and,
  • Flaps Extended and,
  • Airborne or wheel speed greater than 60KT and,
  • FLT CONTROL switch A or B ON,
  • OR: The Main PCU Force Fight Monitor (FFM) trips,
  • Allows Standby System to power: the Rudder and Thrust Reversers
24
Q

Hydraulic Quantity Variations

A
  • When the system becomes pressurized after engine start,
  • Raising or lowering the Landing Gear or Leading Edge Devices,
  • Cold soaking occurs during long periods of cruise
25
Q

Hydraulic LOW PRESSURE Light Flickering

A

Foaming can occur at higher altitudes if the hydraulic system is not properly pressurized

FCOM NG System Description (16 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2025 Bold Learning Solutions. Terms and Conditions