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Air Conditioning

Terms in this set (20)

True or False: The air conditioning packs cool the hot bleed air prior to it entering the flight compartment and passenger cabin.
TRUE
True or False: There are two turbine shutoff valves on the Q400, one for each Pack.
TRUE
True or False: Within the air cycle machine, there is a primary and a secondary heat exchanger.
TRUE
The air conditioning system can receive bleed air from what sources?
Engines. APU.
True or False: Bleed air can be used from the APU and engines at the same time.
FALSE
True or False: The ECU modulates the pack Flow Control and Shutoff Valve position based on Air Conditioning Control Panel selections.
TRUE
True or False: If only one pack is operational, air flow will be reduced?
TRUE
How many different positions do the pack switches have?
Three (OFF, MAN, AUTO)
If the pack FCSOV malfunctions, it defaults to which of the following positions?
OPEN
If bleed air from the engines is unavailable in flight, where does the air come from for cabin ventilation?
NACA vent on dorsal fin
Where is the vent that allows ram air to enter the aircraft for the air conditioning system located?
NACA vent on dorsal fin
When both packs are operating, what is the distribution of the air for the flightdeck and passenger cabin?
25% to flightdeck, 75% to cabin.
When the temperature control is set to full warm, it targets what specific temperature?
27C / 80F
When the temperature control set to full cool, it targets what specific temperature?
15C / 60F
How many fans must fail before a message illuminates on the ED?
Two
The Pack FCSOV will open when what happens?
FCSOV Malfunction. At least one BLEED source selected.
What valves are responsible for controlling the temperature of pack outlet air?
Left/Right Bypass SOV
When the packs are in the AUTO mode, what does the ECU base temperature control upon?
Temperature sensors in aircraft zones.
When the packs are in the MAN position, what does the ECU do?
Controls temperature based on duct supply temperature instead of compartment temperature.
Which of the following statements regarding the avionics cooling system is most accurate?
Uses 3 fans to cool the system & is completely automatic with no cockpit controls
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