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9 Cards in this Set
- Front
- Back
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Explain the function of the CKPT/CABIN TEMP selector switches:
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*AUTO - Temperature automatically adjusts toward HOT or COLD when the selector is moved left or right of the index mark.
*MANUAL - (COLD/STOP/HOT) Spring loaded to stop. In MANUAL, momentarily moving the selector toward HOT or COLD opens or closes the temperature control valve. This is displayed on the L/R VALVE TEMP CONTROL indicator. |
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Explain the meaning of the blue AUTO 1 INOP and AUTO 2 INOP lights on the pressurization panel:
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INOP (2) (blue) - Illuminates when that system fails. The standby system automatically controls pressurization.
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Explain the meaning of the amber AUTO INOP light on the pressurization panel:
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AUTO INOP (amber) - Illuminates when both automatic systems fail. Pressurization is manually monitored and controlled.
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Understand the meaning of the flow light:
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FLOW LIGHT (amber) - Illuminates with a closed outflow valve and a cabin climb is detected.
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Understand the function of the air conditioning shutoff switch:
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*OVRD - Deactivates automatic shutdown of air conditioning packs.
*AUTO - Automatically shuts down packs if either engine fails during takeoff (cabin differential pressure of less than 1.3 psid.) NOTE - Excessive thrust during one engine taxi may activate this automatic shutdown circuit and shut off both packs. Subsequent thrust reduction will restart the packs. |
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Understand the function of the L/R pneumatic X-FEED valve levers:
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*OPEN - Opens respective X-FEED valve.
1) On the ground, supplies APU bleed air or air from a pneumatic ground source for operation of one or both air conditioning packs, and for engine start. 2) In flight, supplies the bleed requirements for airfoil ice protection. *CLOSED - Closes respective X-FEED valve. 1) On the ground, shuts off APU bleed air or air from a pneumatic ground source used for operation of one or both air conditioning packs, or for engine starting. 2) In flight, shuts off bleed air supply for the airfoil ice protection system and for opposite engine pneumatic starts. Air conditioning pack pneumatic supply is from its respective engine only. |
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Explain the function of the CABIN ALT Control Wheel:
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*When cabin altitude control is selected auto, the control wheel rotates as the cabin air outflow valve automatically adjusts to maintain cabin altitude.
*When cabin altitude is selected to manual, the cabin control wheel is locked in position. To adjust cabin altitude, push down on the control wheel and rotate in the desired direction. The Outflow Valve Position Indicator will indicate the position of the cabin air outflow valve. |
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Explain the difference between the AUTO and HP BLD OFF positions of the air conditioning L/R SUPPLY Switches:
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*HP BLD OFF - Closes the augmentation valve inhibiting the utilization of high stage bleed air.
*AUTO - If the low stage pneumatic supply pressure is too low, the augmentation valve opens to supply high stage bleed air pressure. |
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Explain the operation of the RADIO RACK Switch:
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*VENTURI - Turns off radio rack fan. Opens venturi valve.
*FAN - Turns on primary radio rack fan and closes venturi valve to cool radio rack and heat forward cargo compartment. If the primary fan fails in flight, the standby radio rack fan automatically comes on. NOTE - On the ground, both primary and standby radio rack fans come on, and the venturi valve is closed. |
