Air Conditioning Flashcards
During normal operations, 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 before engine start. when will they reopen?
Thirty 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 temp if the lav/galley extract fan fails?
cabin zone inlet duct temperature is fixed at 59* F
If the primary PACK controller channel fails, the secondary pack controller channel automatically takes over and
Pack flow is fixed at pre-failure setting
what occurs if both packs controller channel fail?
PACK outlet temp goes to a set temperature range by the pack anti-ice valve
if a zone controller primary channel fault occurs, what happens to the air conditioning system?
the flight deck is controlled to 76 degrees F by pack 1 and the cabin forward and aft zones are con0trolled to 76 degrees F by pack 2
ALT MODE displays in green on the ECAM COND page when a
primary zone controller fault is detected
if both zone controller channel fail,
the related ECAM information is not displayed and msg PACK REG appears
what pilot action is required with loss of primary and secondary zone contorller channels
none. system automatically goes to a fixed temperature
selecting the RAM AIR switch ON, opens the ram air inlet provided the ___ switch is in its normal position
ditching
when will the avionics ventilation system be in the closed configuration while on the ground?
cold skin temperatures
you are doing the walkaround at ORD in JAN and notice both the inlect and extract valves are closed
this is normal
the avionics ventilation system provides cooling for all the following except the
cabin entretrainment system
The air conditioning RAM AIR switch is selected to ON, the differential pressure is less than 1 PSI. The ram 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
