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17 Cards in this Set
- Front
- Back
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How is the hydraulic system pressurised?
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Bleed air
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Each system has an engine driven and electric driven pump. Explain which pump runs which system or which engine/electrical source.
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ENG 1 pump - System A
ENG 2 pump - System B ELEC 2 pump - System A ELEC 1 pump - System B |
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Hydraulic fluid is used for cooling and lubrication of ELEC pumps. Heat exchangers are located in each respective main fuel tank. What is minimum fuel in each main tank for ground operation of ELEC pump?
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Min fuel in main tank for ELEC hydraulic pump operation, on the ground, is 760 kg.
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When is the RF (refill) indication displayed?
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On the ground only, when the quantity is less than 76%.
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With a leak in system A engine driven pump, is there a total system fluid/pressure loss?
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No. A standpipe prevents complete loss. Indication of approx 20% is left and pressure maintained (reduced) by the ELEC pump.
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With a leak in system A ELEC pump (ELEC 2), is there a total system fluid/pressure loss?
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Yes. The reservoir steadily decrease to indicate 0% and system pressure is lost.
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With a leak in system B engine driven pump, is there a total system fluid/pressure loss?
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One standpipe services both the ENG & ELEC pumps. If a leak occurs in either of the pumps, fluid is lost to the top of the standpipe. Quantity indicates 0% and system pressure is lost.
The fluid below the standpipe runs the PTU. |
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Standby reservior is connect to System B reservior for pressurisation. If a leak occurs in System B is the Standby System affected?
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No.
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Name the 4 items the Standby System runs.
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1. No 1 & No 2 thrust reversers
2. rudder 3. leading edge flaps and slats 4. standby yam damper |
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PTU uses system A pressure to power a hydraulic pump which uses system B fluid. What does the PTU do and under what conditions?
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The PTU supplies additional volume to help the autoslat and leading edge devices when system B engine driven pump loses volume.
3 conditions for the PTU to operate: 1. system B ENG driven pump drops volume below limits 2. airborne 3. flaps are less that 15 but not up |
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Explain how the Landing gear transfer unit works and what conditions it operates in?
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The landing gear transfer unit uses System B hydraulic fluid to help raise the landing gear when System A ENG pump volume is lost.
It operate when: - airborne - No 1 ENG RPM drops below limit - landing gear lever is up - either main landing gear is not up and locked |
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How can you manually activate the STBY RUD system?
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Position either FLT CTRL switch to STBY RUD. This will illuminate the STBy RUD ON light.
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The Standby hydraulic system has an automatic operation under what conditions?
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- loss of both System A & B
- flaps extended - airborne or wheel spin up greater than 60 kts - FLT CONTROL switch A or B in the ON position |
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If a leak occurs in the Standby system what indications are shown?
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The LOW QUANTITY light illuminates (always armed) and the system B reservoir quantity indicator shows 72%.
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Name what systems run of HYD A (A REAL GIANT P)
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Autopilot
Rudder Elevator Ailerons Landing Gear Ground spoilers Inboard flt spoilers Alternate brakes NWS Thrust Reverser Power transfer unit |
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Name what systems run off HYD B (A TOY BAAT L)
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Auotpilot B
Rudder Elevator Aileron Leading edge devices Trailing edge flaps Outboard flt spoilers Yaw damper Brakes (normal) Auto slats ALT NWS Thrust reverser Landing gear transfer unit |
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Name what systems are run off the STBY HYD ( RATY )
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Rudder
Ailerons Thrust Reversers Yaw damper |
