Air Conditioning Flashcards
T/F: The air conditioning packs cool the hot bleed air prior to it entering the flight compartment and passenger cabin.
TRUE
T/F: There are two turbine shutoff valves on the Q400, one for each pack.
TRUE
T/F: 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?
Engine 1, Engine 2, APU, and ground air connection port
T/F: Bleed air can be used from the APU and engines at the same time.
FALSE, bleed air from APU or engines but not both
T/F: The ECU modulates the Pack Flow Control and Shutoff Valve position based on Air Conditioning Control Panel selections.
TRUE (also modulates bypass valve)
T/F: If only one pack is operational, air flow will be reduced.
TRUE (reduced to 70% of flow)
How many different positions do the pack switches have?
3 (OFF, MANUAL, AUTO)
If the pack FCSOV malfunctions, it defaults to which of the following positions?
OPEN to permit continuous ECS operations
FCSOV (Flow Control and Shut Off Valve)
If bleed air from the engines is unavailable in flight, where does the air come from for cabin ventilation?
Emergency outside ram air
does not provide pressurization only ventilation
Where is the vent that allows ram air to enter the aircraft for the air conditioning system located?
Dorsal fin NACA vent
When both packs are operating, what is the distribution of the air for the flight deck and passenger cabin?
25% to the flight deck and 75% to the cabin
When the temperature control is set to full warm, it targets what specific temperature?
27 C in AUTO
or
71 C in MANUAL
When the temperature control set to full cool, it targets what specific temperature?
15 C in AUTO
or
2.8 C in MANUAL
How many fans must fail before a message illuminates on the ED?
Two fans must fail before a message illuminates
If two fans fail in flight = FANS FAIL
If two fans fail on ground = AVIONICS
