Air Conditioning Flashcards
- When controlling the cabin temperature with the manual temperature toggle switch, the ram-air modulating valve is positioned from full hot to full cold in approximately:
D. 15 seconds
- The AIR DUCT O’HEAT annunciator illuminates when the:
B. Temperature of air in the duct to the cabin is too hot.
- How can the windshield anti-ice shutoff valve be opened?
D. All of the above
A. Lost DC power
B. Select windshield anti-ice to HI or LOW
C. Select EMER pressure mode
- Hot engine bleed air through the precooler is further cooled by:
C. Pylon ram scoop air
- The cabin heat exchanger ram-air modulating valve is opened for cooler cabin air or closed for warmer cabin source air by:
C. Both A and B
A. Automatic temperature control
B. Manually toggling the 15-second motorized valve
- The source of bleed air when the EMER PRESS ON annunciator is illuminated in flight is:
A. Either the left, right, or both engines
- The vapor-cycle compressor may be on (green light-on) when:
D. All of the above.
A. Air conditioner in AUTO on a hot day with the ram-air modulating valve full open.
B. Any altitude in AUTO.
C. On the ground without ram air, the ram valve will motorize FULL OPEN any time cabin temperature is above the cabin temperature control set point engaging the compressor.
- The vapor-cycle compressor is off (green light-out) when:
D. All of the above.
A. AIR COND circuit breaker is popped.
B. Ram-air modulating valve more than
50% closed in AUTO.
C. Automatic load-shedding circuit during engine or generator failure.
- What closes the L and/or R PRSOVs:
D. All of the above
A. Selecting L or R
B. Selecting FRESH AIR, EMER, or OFF
C. In AUTO, during cabin taxi temperatures over 18°C (65°F), temperature sensor closes the PRSOVS
- The pilot and copilot footwarmer outlets are located:
B. Under the pilot and copilot rudder pedals
- In the AUTO position, the forward fan is
OFF except:
B. When the compressor is on, then operating at low speed
- The AFT fan switch has:
B. LOW, HI, and FLOOD positions
- The FWD fan switch has:
A. LOW, AUTO, or HI positions
- During climb and cruise, the COCKPIT AIR DIST knob is selected to:
C. NORM, 50% air to crew
- Cabin air is circulated through two evapo-rators; one is in the forward left cabin just ahead of the main cabin entry door, and one is on the aft pressure bulkhead. The aft evaporator provides conditioned air to the:
B. Overhead WEMACs
- The cabin air temperature in the AUTO mode keeps the cabin temperature in a selectable range of:
C. 65° to 85°F
- The ram-air modulating valve controls:
A. The amount of cooling ram inlet air that passes through the main cabin heat exchanger
- Selecting the FRESH AIR position:
B. Depressurizes the cabin in flight
- The GPU is powering the compressor and both evaporators in AUTO on a hot day before engine start. The pilot is concerned that no cool air is venting the cabin overhead WEMACs when the AFT FLOOD fan switch is in HI or LOW.
D. All of the above
A. This is normal
B. The flood-cooling door spring loads to the flood cool (open) position without 23 psi service air
C. With either engine running, 23 psi service air closes the flood-cooling doors, thus sending all aft evaporator cooling air to the overhead WEMACS
