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29 Cards in this Set
- Front
- Back
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When is standby system used? |
Pressure loss on system A or B |
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How are leaks in system A and B backed up? |
By a standpipe |
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How is standby system pressurized? |
Via bleed air through system B |
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How is hydraulic fluid quantity and pressure displayed? |
Pressing SYSTEM switch on center fwd panel; indications on lower DU |
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Hydraulic pressure range Hydraulic quantity range What does RF mean? When is this accurate? |
3000 - 3500 psi 0 - 106% Refill, depicted when less than 75%. Accurate on the ground with engines off or taxi in with flaps up |
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Hydraulic systen A actuates... |
- ailerons - rudder - elevator (feel) - flight & ground spoilers - alterbate brakes - no. 1 thrust reverser - autopilot A - normal nose wheel steering - landing gear - PTU |
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Items usable after loss of system A... |
- all usual items, exept: - standby systen for No. 1 thrust reverser - gear extension is manual, but no retraction - nose wheel steering selected to ALT; powered by system B |
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Items usable after loss of system B... |
- all usual items, exept: - alternate brakes available - standby pressure for LE flaps & slats and No. 2 thrust reverser - TE flaps extended electrically, but bot retractable |
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Hydraulic system B actuates... |
- ailerons - rudder - elevator (feel) - flight spoilers - LE/TE flaps & slats - normal brakes - no. 2 thrust reverser - autopilot B - alternate nose wheel steering - autoslats - yaw damper |
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What happens when a leak occurs in system A; - in EDP or related lines - electric pump or anything connected to pump |
- standpipe prevents total pressure loss - total pressure loss |
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What happens if leak occurs in system B in any part? |
Total pressure loss, standpipe provides pressure for PTU. |
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What does manual reversion mean and what happens? |
Loss of system A and B. Same as individual loss, but brakes use accumulator pressure only and nose wheel steering is lost. |
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Low pressure light are signaled by... |
Pressure switches |
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Pressure indicator receives input from... |
Pressure sensor, measuring total pump pressure output |
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What happens when hydraulic fluid is foaming or on system A the only working pump is the electrical pump? |
Low pressure light, master caution light and annunciator lights fluctuate. |
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What happens when you switch off engine driven pump? |
Pump keeps rotating. Blocker valve is energized blocking the fluid. |
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EDP flow is ___ times higher than electric driven pump flow. |
4 (6 on newer models) |
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Meaning of OVERHEAT light. |
Pump or hydraulic fluid is hot |
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Minimum fuel for ground operation of electric driven pump |
76p kgs |
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Power Transfer Unit helps power... Operates when... |
System B, autoslats and LE flaps and slats - in flight - system B pressure low - flaps not up (and less than 15) |
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Landing Gear Transfer Unit helps power... Operates when... |
System A: landing gear position - in flight - no. 1 engine low RPM - landing gear lever UP - landing gear not up and locked |
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When engine fire switch is pulled... |
- hydraulic fluid shutoff valve - LOW PRESSURE light deactivated |
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How are pumps cooled? |
By hydraulic fluid passed through heat exchangers |
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Standby system operates |
- thrust reversers - rudder - LE flaps & slats - standby yaw damper |
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When is STANDBY HYD LOW QUANTITY light armed? |
Always |
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When is STANDBY HYD LOW PRESSURE light armed? |
When standby system is activated |
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Manual standby operation |
- FLT CONTROL switch to STBY RUD - ALTERNATE FLAPS ARM |
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Automatic operation of standby system |
- loss of system A or B, and - flaps extended, and - in flight/wheel speed > 60 kts, and - FLT CONTROL switch system A or B ON OR - main PCU FFM trips |
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What happens when there is a leak in standby system? |
System B operative: 72% quantity LOW QUANTITY light on when reservoir is half empty |
