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How many hydraulic systems are on the airplane ?
What are the main components of the hydraulic system?
- 2 systems.
- Each has an accumulator, two pumps and a reservoir.
- One engine driven the other electric.
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What is the pressure on the engine driven pumps?
Electric pumps? any difference in volume?
- 3000 psi
- 2900 psi
- Yes electric pump puts out less volume
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What is the purpose of the Hydraulic resevoir?
How many liters are held in the reservoir?
When is a low quantity signaled?
- Self pressurized to avoid cavitation.
- 6 liters
- < 1liter
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How does the hydraulic shut off valve close?
Where is it installed?
Can the Engine Driven pump be turned off?
- By pressing the hydraulic ENG pump shutoff. By pulling the fire extinguishing handle.
- Between the reservoir and the engine driven pump.
- NO
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What are the hydraulic engine driven pumps driven by?
The accessory gear box.
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What side is the priority valve located and what is its purpose?
- Only on #1 engine.
- Used to give the flight controls priority if pressure drops below 2600 psi and landing gear is commanded to retract.
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What is the purpose of the accumulator on the #1 system? #2 system?
- Keep surges of the hydraulic system to a minimum.
- Assists in raising gear if pressure drops below 2600psi with priority valve. Also let's four cycles of the main cabin door.
- #2 six applications of emergency brake, will hold for 24 hours.
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When do electric pumps come on?
- In AUTO MODE:
- N2 is below 56.4% or
- Hydraulic pressure <1600 psi="" br="">In ON mode: selected above.
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What are each hydraulic pump powered by?
Powered by opposite DC bus.
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What is on hydraulic system 1? 2?
- #1
- Ailerons, rudder, outboard brakes, inboard spoilers, thrust reversers 1, landing gear, nose wheel steering, main door.
- #2
- Ailerons, rudder, inboard brakes, outboard spoilers, thrust reversers 2, emergency brake.
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How is the airstair main door operated?
- raised by two hydraulic door actuators.
- hydraulic system 1
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Where is the accumulator located for number one system?
front right side.
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Why do we have four gear pins?
for each landing gear and on for the hydraulics.
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