(1) If the test gives the maintenance message SKIN AIR INLET V 15HQ, replace the VALVE-SKIN AIR INLET, AVNCS VENT (15HQ) (Ref. AMM TASK 21-26-52-000-001) and (Ref. AMM TASK 21-26-52-400-001).
(2) If the test gives the maintenance message ISOL V 24HQ, replace the VALVE-SKIN EXCHANGER ISOLATION, AVNCS VENT (24HQ) (Ref. AMM TASK 21-26-55-000-001) and (Ref. AMM TASK 21-26-55-400-001).
(3) If the test gives the maintenance message DUCT TEMP SENSOR 26HQ, replace the SENSOR-DUCT TEMP, AVNCS VENT (26HQ) (Ref. TASK 21-26-00-810-818).
(4) If the test gives the maintenance message BLOWER FAN 20HQ:
- make sure that the avionics ventilation filter is not clogged. If necessary, replace the CARTRIDGE-AVNCS VENT FILTER (2082HM) (Ref. AMM TASK 21-26-43-920-001).
- do a check of the status of the circuit breaker (1HQ).
(5) If the test also gives the maintenance message PRESSURE SW 19HQ and/or PRESSURE SW 17HQ:
- do the procedures (Ref. TASK 21-26-00-810-814) and (Ref. TASK 21-26-00-810-815).
(6) If the circuit breaker (1HQ) is closed:
- do a check for 115VAC at pins A/J, A/K, A/L of the blower fan (20HQ).
(a) If there is no 115VAC:
- do a check for 115VAC at pins T1, T2, T3 of the blower fan control-contactor (8HQ).
1 If there is no 115VAC:
_
- do a check for a short to ground at the wiring between the blower fan control-contactor (8HQ) and the circuit breaker
「一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一1 EFF : ALL ∞∞21-26-00∞∞∞∞∞∞∞∞∞∞Page 228
May 01/05 CES (1HQ), pins L1, L2, L3 and respectively pins A2, B2, C2 (Ref. ASM 21-26/03).
a If there is a short to ground:
_ - repair the related wiring.
b If there is no short to ground:
_
- replace the C/B-AVNCS BLOWER FAN (1HQ).
2 If there is 115VAC:
_
- do a check of the status of the circuit breaker (3HQ).
a If the circuit breaker (3HQ) is closed:
_ - do a check for 28VDC at pin A/E of the blower fan (20HQ).
. If there is no 28VDC:
* do a check for a short to ground at the wiring between the blower fan (20HQ) pin A/E and the circuit breaker (3HQ) (Ref. ASM 21-26/03).
** If there is a short to ground:
*** repair the related wiring.
** If there is no short to ground:
*** replace the C/B-AIR COND AVNCS VENT/MONG (3HQ).
. If there is 28VDC, make sure that the warning light of
the blower fan (20HQ) is off.
* If the warning light is on, push the RESET pushbutton switch on the blower fan (20HQ).
NOTE : The fan can operate immediately.
____ The warning light goes off.
** If the fault continues, replace the FAN-BLOWER, AVNCS VENT (20HQ).
* If the fault continues, do a check for 28VDC at pin AA/8A of the AEVC (10HQ).
** If there is 28VDC:
*** replace the AEVC (10HQ) (Ref. AMM TASK 21-26-34-000-001) and (Ref. AMM TASK 21-26-34-400-001).
** If there is no 28VDC:
*** do a check and repair the wiring between the AEVC
(10HQ), pin AA/8A and the blower fan control-contactor
(8HQ), pin Z and between the blower fan control-contactor
(8HQ), pin X and the blower fan (20HQ), pin A/D (Ref. ASM
21-26/03).
** If the fault continues:
「一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一1R EFF : 001-049, 101-149, 151-199, 201-299, ∞∞21-26-00∞∞∞∞∞∞∞∞∞∞Page 229
May 01/05 CES
*** replace the CNTOR-BLOWER FAN CTL, AVNCS VENT (8HQ).
**** If the fault continues:
***** replace the FAN-BLOWER, AVNCS VENT (20HQ) (Ref. AMM
TASK 21-26-51-000-001) and (Ref. AMM TASK 21-26-51-400-001).
b If the circuit breaker (3HQ) is open:
_ - close the circuit breaker.
. If the circuit breaker trips:
* do a check for a short to ground at the wiring between the blower fan (20HQ) pin A/E and the circuit breaker (3HQ) (Ref. ASM 21-26/03).
** If there is a short to ground:
*** repair the related wiring.
** If there is no short to ground:
*** replace the FAN-BLOWER, AVNCS VENT (20HQ) (Ref. AMM
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本文链接地址：A320 Trouble Shooting Manual 排故手册 AIR CONDITIONING 空调1(69)
