Theoretical Knowledge Flashcards
Which systems are powered by the #1 hydraulic system?
- Flaps
- Inboard Spoilers
- Rudder
- Elevator
- PTU
- Brake
- Anti-Skid
Which systems are powered by the #2 hydraulic system?
- Landing Gear
- Outboard Spoilers
- Steering
- Elevator
- Rudder
- Emergency Brake
In which hydraulic system is the priority valve located?
1 hydraulic system
Which systems are lost when the priority valve closes?
- PTU
- Flaps
When does the priority valve close?
Pressure in #1 system falls below 2100 psi.
Which systems remain available when the isolation valve in #1 hydraulic system closes?
- PTU
- Elevator
- Rudder
- Flaps
When does the standby hydraulic pump come on automatically?
- Failure of #1 Engine
- Flaps selected to more than 0
- Parking Brake released
The pump does not come on automatically when the #1 hydraulic pump fails.
When does the PTU come on automatically?
- # 2 hydraulic pump failure
- # 2 engine failure
- Flaps selected to more than 0
- Parking brake not set
Which systems remain available when the isolation valve in #2 hydraulic system closes?
- Elevator
- Rudder
What are the requirements for the PTU to work?
- Normal hydraulic pressure (>2400 psi) in #1 hydraulic system
- Normal hydraulic fluid in #2 hydraulic system
Will the green ON light come on if the standby hydraulic pump comes on automatically?
No
Will the green ON light come on if the PTU comes on automatically?
Yes
How are the different hydraulic pumps powered?
- # 1 and #2 are engine driven
- # 3 is electrically powered (DC from the stby battery)
- Standby hydraulic pump is electrically powered (AC)
Which systems are powered by the #3 hydraulic system?
Elevators
When does the isolation valve open automatically in the #3 hydraulic system?
- Failure of either #1 or #2 hydraulic system
- Failure of both hydraulic systems
- Dual Engine Failure
What should be the fluid quantity in the hydraulic systems?
- 40% in system #1 and #2
- 45% in system #3
Pressure of standby hydraulic pump
2800 - 3000 psi
Pressure of #1 and #2 hydraulic system
2900 - 3100 psi
Pressure of #3 hydraulic system
2400 - 3100 psi
3 HYD PUMP caution light illuminates when:
- Pressure falls below 900 psi
- # 3 hydraulic pump motor operates more than 60 seconds on the ground
Function of the Battery Master switch
Connecting the Batteries to the respective essential Buses.
- Stby and Main Battery are connected to the right essential Bus
- Aux Battery is connected to the left essential Bus
Function of specific Battery switches?
Connects the Batteries to their respective Main Buses.
- Stby and Aux Batteries are connected to the left Main Bus
- Main Battery is connected to the right Main Bus