Enviro PILATUS PC12 - Table 3 Trouble Shooting List

Component Maintenance Manual
12037 N Highway 99
Seminole, OK 74868
Phone (405) 382-0731
Fax (405) 382-0737
http://www.enviro-ok.com
Copyright © 2017
ATA 21-00-23
Page | 24
Revision 10
June 1, 2017
INDICATION
PROBABLE CAUSE
POSSIBLE SOLUTION
G. Compressor Assembly Will
Not Operate
1. Circuit Breaker failed or off
1. Energize or replace
2. Relay failed
2. Replace
3. Pressure switch failed
3. Replace
4. Drive motor failed
5. Replace
5. Drive motor fuse blown
6. Replace
6. Ground power cart not plugged
in
7. Connect as required
7. Low ambient temperature
8. Normal cutout
8. Low refrigerant charge
9. Charge system
9. Motor temperature switch failed
10. Replace switch
H. No Evaporator Module Air
Flow
1. Circuit breaker off
1. Energize or replace
2. Mode switch failed
2. Replace
3. Fan speed switch failed
3. Replace
4. Seized motor
4. Replace
5. Blower wheel failed
5. Replace
6. Blocked air ducts
6. Remove debris
7. Aircraft power not on
7. Energize
8. Ground power not on
8. Energize
I. Evaporator Module Coil
Freezing
1. No air flow
1. Turn fan on
2. Expansion valve failed or
clogged
2. Remove debris or replace
3. Expansion valve setting low
3. Reset to obtain 26-30 psig
suction pressure
J Pressure Switch Cycles (High
Pressure Cutout)
1. System over charged
1. Reclaim refrigerant as required
2. Condenser coil inlet air
extremely hot
2. Normal condition
3. Condenser inlet clogged
3. Remove debris
4. Discharge line clogged or
kinked
4. Replace or straighten line
5. Excessively high ambient
temperature
5. Normal Condition
K Fault LED Light Illuminated
Inside Evaporator Motor Vent
Cap/Screen (1134200-60/-61/-63)
1. Numerous evaporator failures
can cause this indication.
1. Replace evaporator module
assembly
Table 3 Trouble Shooting List