Air Conditioning Flashcards
Can you run the packs while connected to ground air
No
What Do the 3 stby modes for pack operation do (N,C,W)
N- constant moderate temp
C- full cold
W-full warm
How is the flow control and shutoff valve controlled and powered
Electronically controlled with the pack control selector and pneumatically powered
A compartment INOP light indicates
Excessive temp of the conditioned air in the distribution ducting
Temp selector is off
A fault in the trim air controller
When will FLT DK INOP light illuminate
Fault in zone temp controller
Trim air switch is off
When will the VALVE light illuminate and FWD EQPT VAL display
If system fails to reconfigure during automatic operation
What dose placing the equipment cooling selector in standby do
Reconfigures to recirculate cooling air back through the system for inboard air flow
What dose placing the equipment cooling selector in OBRD do
Uses differential air pressure to draw air back through the system and exhaust it overboard
What happens if no cooling airflow is sensed after selecting OVRD
The NO COOLING light illuminates and FWD EQPT COOLING eicas
When is the NO COOLING light active
When equip cooling selector is in OVRD
When will the cargo compartment valve shut off automatically
Compartment is over 90 degrees F (32C)
The INOP light and EICAS advisory message FWD CARGO A/C indicate a failure in the cargo air condition system or:
Either pack valve is closed
Either engine bleed valve is closed
The forward cargo air conditioning shutoff valve failed closed
An auxiliary zone controller failed
The forward cargo temperature selector failed
Either cargo fire switch is armed
What dose a PACK OFF light indicate
Pack valve closed:
Either pack control selected off or loss of air to the pack
When will the PACK INOP light illuminate
Pack overheat or fault in automatic controller
The amber FAULT light illuminates and the EICAS advisory message FWD CGO BACKUP displays when
There is a fault in the forward cargo compartment temperature control system
Both cargo ground valves failed open
The system is operating in backup mode
