Air Conditioning Questions Flashcards
The Air conditioning system temperature is regulated by
One zone controller and two PACK controllers
The pack flow control valve automatically closes for all but which of the following
High air pressure
Under normal conditions it is possible to control temperature in all areas except the
Forward cargo compartment
If the APU is supplying bleed air or one PACK fails, ______ flow is delivered regardless of pack flow selector position
HI
If Pack Flow is selected to LO and temperature demand cannot be satisfied, the pack reverts to _____flow
NORM
What happens if a zone cooling demand is not met due to low bleed pressure
Engine idle is automatically increased
The PACK valves close when the ENG MODE SEL switch is placed to ING/START on the ground prior to engine start. When will they reopen?
30 seconds after first engine start if second engine start has not been initiated
Hot _____ air from the pneumatic system is used to maintain desired zone temperature
Trim
Using external conditioned ground air simultaneously with airplane pack air is
Prohibited
The HOT AIR FAULT light illuminates amber when a duct _____ is detected
Overheat
What happens to cabin zone inlet duct temperature if the lab/galley extract fan fails?
Cabin zone inlet duct temperature is fixed at 59F
Which of the following is true if the primary PACK controller channel fails
Secondary channel takes over automatically and the pack flow is fixed at pre-failure setting
What occurs if both PACK channels fail?
PACK outlet temp goes to a set temperature range by the pack anti-ice valve.
If the primary zone controller channel fails,
The flight deck is controlled to 76 degrees F by pack 1 and the cabin forward and aft zones are controlled to 76 degrees F by pack 2
ALTN MODE displays in green on the ECAM COND page when a
Primary zone controller fault is detected
IF both zone controller channels fail,
The related ECAM information is not displayed, and the message PACK REG apples
What pilot action is required with loss of primary and secondary zone controller channels
None. System automatically goes to a fixed temperature
Selecting the RAM AIR switch ON, opens the ram air inlet valve provided the _____ switch is not selected ON
DITCHING
When will the avionics ventilation system be in the closed configuration while on the ground?
Cold Skin temperatures
You are doing the walk around at ORD in January and notice both the inlet and extract valves are closed. You should
Continue the walk around this is normal
The avionics ventilation system provides cooling for all the following except the
Cabin entertainment system
The Air Conditioning RAM AIR switch is selected to ON, the differential pressure less than 1 PSI. The ream air inlet opens and the outflow valve
Opens to approximately 50% if the cabin pressure MODE SEL switch is in AUTO
While pre-flighting, you hear a horn in the nose wheel well. Since the APU is NOT running, this may indicate a
Duct overheat in the avionics ventilation system
