Air Conditioning

Question 1

PACK Light illuminated

Answer 1

Indicates pack trip off
or
Failure of both primary and stanby pack controls
During MC Recall indicates failure of either primary or standby pack controller or
SRADA system fault
Extinguishes with MC Reset

Question 2

Equipment Cooling OFF Light

Answer 2

No airflow from associated Cooling Fan

Question 3

When you press the TRIP RESET Button what happens?

Answer 3

If the fault condition is corrected:
Resets BLEED TRIP OFF, PACK and ZONE TEMP LIGHTS
Related engine bleed air valves open or
related Pack Valves Open or
related air mix valves open
Light remain illumnated until reset

Question 4

Air Conditioning PACK Switch Positions
OFF
AUTO
HIGH

Answer 4

OFF-
Pack signaled OFF

AUTO-
With both Packs operating regulates to Low Flow
With 1 Pack, regulates to High Flow w/Flaps Up
When operating 1 Pack from APU (Both ENG Bleeds OFF) regulates to High Flow

HIGH-
Pack regulates to High Flow
Provides maximum flow rate on the ground with 1 Pack on with APU Bleed Switch ON

Question 5

L and R RECIRC FAN Switches
OFF
AUTO

Answer 5

OFF-
Fan signaled OFF

AUTO MODE
In Flight-
L RECIRC FAN operates if BOTH Packs are operating UNLESS either PACK Switch is in HIGH

The R RECIC FAN operates if both PACKS are operating unless both Pack Switches are in HIGH

On the Ground-
L RECIRC FAN operates if BOTH Packs are operating UNLESS BOTH PACK Switch are in HIGH

R RECIC FAN operates even if both PACKS are operating with both Pack Switches are in HIGH