1.8 Hydraulic System Flashcards
What services are powered by the main hydraulic system?
1) Roll Spoilers
2) Powered ailerons
3) Power brake and anti-skid control valve
4) Airbrake
5) Flaps
6) Landing Gear
7) Uplock actuators
Where is the main hydraulic pump located and what is its purpose?
- Driven by and situated on the accessory gearbox
- Purpose is pump pressurized hydraulic fluid to be used by the hydraulic system.
Where is the firewall shut off valve located and what is its purposed?
- Located between the low pressure hydraulic reservoir and the main hydraulic pump
- When operated, it stops the flow of hydraulic fluid to the engine.
After the hydraulic pump, where does hydraulic fluid flow?
To the power pack manifold where it is then filtered
After the power pack manifold, where does the pressurized hydraulic fluid flow?
1) To the selector manifold for distribution to hydraulic services
2) Directly to the flap actuator UP port
3) Directly to the emergency manifold to charge the emergency accumulator
What does the selector manifold contain?
5 solenoid valves to:
- Landing gear actuator
- Flaps TO actuator
- Flaps LDG actuator
- Airbrake actuator
- Servo manifold
What does the servo manifold do?
It filters the hydraulic fluid even further to then supply hydraulic fluid to powered ailerons, roll spoilers, powered wheel brakes and anti-skid valves.
What switch controls the servo solenoid?
TRIM AIL PWR switch
What services will you lose if the TRIM AIL PWR switch is turned to off?
Lose hydraulic power to:
1) Powered wheel brakes
2) Roll spoilers
3) Anti-skid
4) Powered ailerons
Lose electrical power to:
1) Trims
2) Autopilot
Without servo power, how will the aircraft handle?
1) Significantly reduced roll rate
2) Aileron forces will be heavier than neutral
3) No trims
4) Wheel brake pedals must be pressured harder than normal
5) Anti-ski inoperative
What does the emergency hydraulic system give?
Used to:
1) Extend the landing gear
2) Operate the powered wheel brakes
How does one activate the emergency hydraulic system?
Through the EMER LDG GR handle
What does pulling the EMER LDG GR handle do?
1) Landing gear extends and cannot be retracted
2) Flaps can be lowered but not retracted
3) Powered brakes can be used for 6 full applications
4) Anti-skid system is inhibited
5) Main hydraulic system is shut off
Is electrical power required for hydraulic services?
Yes except:
1) Emergency landing gear extension system
2) Manual braking hydraulic services
What hydraulic services does the BATT BUS power?
1) Landing gear
2) Flaps
3) Servo solenoid
4) Trim Ail PWR Off switch
