B757 Air Conditioning Flashcards
Trim air system failure causes the packs to do what?
Maintain a cabin temp of 78F
Recirc Fan is inhibited when?
Load Shed
Cargo Fire
Eqt Cooling Smoke
Where are smoke detectors located for EE?
EE air exhaust ducting
EE Air supply ducting
Forward EE exhaust Duct Smoke automatic Actions?
Left Recirc Fan shut off
Left AC pack high flow
OVBD exhaust valve latched open
FWD EE Supply DUCT actions?
Big supply fans shutoff
OVHT indicator light inhibited for 5 mins
(Pushing ALTN switch starts the alternate supply fan)
Left Recirc fan shutoff
Both AC packs high flow
OVBD exhaust valve is latched open
Recirc Fan provides air to where?
E/E and then back to the mix manifold
What happens if the Recirc Fan is turned off?
Recirc Fan INOP light OVBD exhaust valve opens EICAS - L RECIRC FAN Increased Fuel Consumption MX action to reset OVBD EX VAL OPEN status msg
PACK OUTLET OVHT
INOP light Pack operates - uncontrolled - degraded condition - Requires crew intervention
Internal Pack OVHT
Pack valve closes Pack is shut down automatically EICAS L/R pack off INOP light PACK OFF
Electrical power on acft for more than __________ minutes equipment cooling must be provided
20 minutes
OAT 34 to 49 degrees - one pack
Plus 49 degrees - two packs
Eng bleed Switch
With flow bar
And
OFF light
indicates
• valve is armed
• valve has a fault
Pack RESET Switch - INOP = ?
- Pack overheated
2. Fault in automatic control system
PACK OFF light ?
The PACK valve is closed.
Compartment Temp Control - OFF ?
- Closes compartment trim air valve
2. Compartment temp INOP light illuminates
TRIM AIR switch
ON - trim air valve is commanded open
OFF (not annunciated) - trim air valve is commanded closed
Trim Air OFF light - TRIM AIR switch is off.
