When does system 3 main pump run?
Continuously
What does the hydraulic system supply pressure at?
3000 psi
Which flight controls are powered by more than 1 hydraulic system?
Rudder, elevators, and ailerons
When do systems 1b and 2b operate?
- respective bus powered
- any generator operating
- flaps out of 0°
Do systems 1b and 2b automatically activate after an engine failure or EDP failure?
No
What is normal hydraulic system level?
45-85%
Low pressure caution
1800 psi
High temperature caution
96°C
How can you close the hydraulic shutoff valve?
Pressing the HYD SOV push light or ENG FIRE PUSH
Does hydraulic system use a heat exchanger?
No, relies on natural convection
How are hydraulic systems 1 and 2 cooled?
A single air/hydraulic oil heat exchanger
Which system will automatically be powered if the ADG deploys?
System 3b
How many accumulators?
- 5 total
- 1 for each system (1, 2, 3)
- 1 for each brake system (inboard/outboard)
What are the hydraulic accumulators charged with?
Dry nitrogen
What is the purpose of the accumulators?
Dampens pressure surges and satisfies instantaneous demands of aircraft systems
