IF NECESSARY, REPLACE
THE RECEIVER DRIER.
AIR IN SYSTEM MAY CAUSE
BUBBLES IN SIGHT GLASS
Insufficient cooling with bubbles in sight glass
Figure 101
WA
Validity : KEITH 21 55 00Page 102
(BA) AUG 01
INSUFFICIENT COOLING WITHOUT BUBBLES IN SIGHT GLASS PREREQUISITES
"AIR COND.", "A/C CLUTCH", "EVAP. FAN"
AND "A/C CTL" CIRCUIT BREAKERS CLOSED
CONDUCT A
PERFORMANCE TEST AND
MEASURE THE
PRESSURES AND THE
TEMPERATURES
IS HEAD PRESSURE
HIGH ?
NO
IS SUCTION PRESSURE
HIGH WHILE HEAD
PRESSURE IS LOW ?
NO
0
THE THERMAL EXPANSION
VALVE IS EXCESSIVELY
OPEN.
REPLACE THE THERMAL
EXPANSION VALVE
- OVERCHARGE OF REFRIGERANT : DISCHARGE SOME OF REFRIGERANT TO CORRECT LEVEL
- AIR IS MIXED IN : DISCHARGE SYSTEM AND REPLACE RECEIVER DRIER. EVACUATE AND RECHARGE SYSTEM
- CONDENSER'S FIN IS DENTED OR CLOGGED WITH DUST :
CLEAN EXTERIOR SURFACE WITH WATER
VALVE OR GASKET OF
COMPRESSOR IS
DAMAGED.
REPAIR OR REPLACE
COMPRESSOR
(MM 21-55-01)
Insufficient cooling without bubbles in sight glass
Figure 102 (1/2)
WA
Validity : KEITH 21-55-00Page 103
(BA) AUG 01
PIPE AT RECEIVER DRIER
OUTLET HAS LOW
TEMPERATURE.
RECEIVER DRIER IS
RESTRICTED.
REPLACE RECEIVER DRIER
FINS AND TUBES OF
EVAPORATOR ARE
DAMAGED.
REPAIR OR REPLACE
EVAPORATOR
THERMAL EXPANSION
VALVE IS EXCESSIVELY
CLOSED OR GAS LEAKAGE
FROM TEMPERATURE
CONTROL/SENSOR.
REPLACE THERMAL
EXPANSION VALVE
Insufficient cooling without bubbles in sight glass
Figure 102 (2/2)
NOISY OPERATION, PREREQUISITES
COMPRESSOR ON "AIR COND.", "A/C CLUTCH", "EVAP. FAN"
AND "A/C CTL" CIRCUIT BREAKERS CLOSED
4
IS THE BELT YES ADJUST TENSION OF BELT
LOOSE ? (MM 21-55-01)
NO
V YES
REPLACE THE
COMPRESSOR
IS THE COMPRESSOR
NOISY ?
(MM 21-55-01)
NO
WHEN ENGINE RPM IS
CHANGED, ARE THERE YES RETIGHTEN BRACKET
VIBRATIONS AND ATTACHMENT BOLTS
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本文链接地址：TB20 MAINTENANCE MANUAL 21 AIR CONDITIONING TB20飞机维护手册 21 空调(21)
