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31 Cards in this Set
- Front
- Back
- 3rd side (hint)
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Bleed air is normally taken from the ___th stage (low pressure)
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5th
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------th stage of the compressor assists during low engine speeds
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9th
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9th stage (high pressure) valve is ____ ________ closed, open at ____, and closes at __ psi.
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spring loaded
idle 35 |
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The Engine Bleed Valve is __ controlled and uses ____ force to open, _____ force to close
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DC
pneumatic spring |
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Engine Bleed Valve acts as a ______ _______ and ____ ___ _____
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Pressur Regulator
Shut-off Valve |
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Engine Bleed Valve gets electrical control from ____ __ and ____ __ busses
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DC 1
DC 2 |
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Engine Bleed Valve acts as a temperature regulator and closes at ____ F. The _____, _____, and ____ lights illuminate.
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490F
BLEED TRIP OFF AIR COND MASTER CAUTION |
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The APU Bleed Switch/Valve is __V DC operated off the ____ Bus.
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28 V
Battery |
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The APU Bleed Valve is able to open into the left duct when APU speed is > ___ RPM
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95%
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Max Pneumatic System Pressure
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60 PSI
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The ______ valve separates the Manifold into left and right sides
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Isolation
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The Isolation Valve is ___ operated and remains in position with a ____ _____.
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AC
Power Failure |
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When in AUTO with either one or more packs or bleeds off, the isolation valve _____.
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opens
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The Isolation Valve looks at the bleed ______, not the bleed _____.
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switches
valves It is "switch sensitive" |
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The _____ bleed switch has no effect on isolation valve position
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APU
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Pneumatic Pressure Indicator requires ____ power.
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AC
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Wing Body Overheat
Left Side elements Right Side elements |
Left: engine strut, leading edge, air cond bay, keel beam, APU
Right: engine strut, leading edge, air cond bay |
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Electronic (Analog) Pressure Controller failure causes
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1) Loss of AUTO AC pwr for more than 15 seconds
2) Cabin ALT 13, 875 ft 3) Excessive cabin rate of change +/- 1800 fpm |
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OFF SCHED DESCENT light causes
(Analog Pressure Controller) |
1) A/C descent prior to cruise
-Controller programs cabin to land at takeoff field elevation |
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OUTFLOW VALVE switch
(Analog Pressure Controller) |
OPEN- opens main cabin outflow valve electrically
CLOSE- closes main cabin outflow valve electrically when in manual mode: full travel 7 sec in AC, 14 sec in DC |
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Digital Pressure Controller failure causes
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1) loss of DC power
2) pressure controller fault/failure 3) excessive cabin rate of change +/- 2000 fpm 4) Cabin ALT > 15,800 ft |
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OFF SCHED DESCENT light causes
(Digital Pressure Controller) |
1) A/C has started descent at least 1000 ft prior to cruise
-T/O alt is retained in memory and auto controller schedules descent for return to dept airport minus 300 ft |
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Main Outflow Valve is signalled closed if cabin alt exceeds ____ft in AUTO or ALT mode or ___ft in STBY mode.
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14,500 ft - AUTO or ALT
14,625 ft - STBY mode |
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Flow Control Valve (300/500) is spring loaded open during ____ ____, ____ ___, and ____ ____ below a cabin diff press of approximately ___ psi
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Ground Operation
Unpressurized Flight Pressurized Flight, 2.5 psi |
Discharges warm air from EE Bay. When valve closes, air is directed around fwd cargo compartment liner for in-flight heating.
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Overboard Exhaust Valve OEV (700) 3 modes
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Normal Mode
High Flow Mode Smoke Clearance Flow Mode |
Pneumatically controlled pressure regulated air shutoff valve
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OEV Normal Mode
Fully closed when diff press is more than ___psi |
1 psi
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Exhaust air is then discharged under the fwd cargo compartment floor for inflight heating
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OEV High Flow Mode occurs when (3 conditions)
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1) Either pack in HIGH
2) Recirc Fan in AUTO 3) Main Outflow Valve has supplied "open enable" cmd |
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OEV Smoke Clearance Flow Mode occurs when (2 conditions)
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1) Either pack in HIGH
2) Recirc Fan OFF |
28 V DC actuator overrides pneumatic control to open OEV to clear smoke
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Forward Outflow Valve (300/500) closes when Main Outflow Valve is within ___ of full-closed position or ___ ___ is operating.
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0.5 degrees
recirc fan |
Discharge exit for air circulated around the fwd cargo compartment
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Forward Outflow Valve opens when the Main Outflow Valve opens approx ___, or if the ___ ___ is not operating.
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4.5 degrees
recirc fan |
Placing the right pack to HIGH turns off recirc fan and opens FOV, adding more fresh air to pressure vessel
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Pressurization Relief Valves limit differential pressure to ___ psi in 300/500 or ___ psi in 700.
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8.65 psi
9.1 psi |
Vacuum relief valve prevents pressure inside a/c from becoming less than ambient pressure. Can be checked on walk-around by pushing door inward
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