Component Maintenance Manual
EFFECTIVITY: ALL
21-00-22
Page
1005
JULY 21, 2011
NOTE
: Refer to Refrigerant Flow (Figure 2)
INDICATION PROBABLE
CAUSE POSSIBLE
SOLUTION
A. No System Power
1. Ground power not connected
1. Plug in ground power cart
2. Aircraft power switch off
2. Energize power switch
B. Power On But System Will
Not Operate
1. Air conditioner breaker off
1. Turn on
2. Air conditioner breaker failed
2. Replace
3. Air conditioner mode switch
failed
3. Replace
4. Relay(s) failed
4. Replace
5. Failed pressure switch
5. Replace
6. Failed drive motor
6. Replace
7. Vented system
7. Pressure check, evacuate and
charge
8. Low ambient temperature
8. Normal cut out function
9. Drive motor fuse blown
9. Replace
10 Drive motor temp sw failed
10 Replace switch
11. Contactor control line fuse
blown
11. Replace
Table 3 Trouble Shooting List
