3. Fault Confirmation
__________________
A. Test
(1) Do the operational test of the avionics equipment ventilation from the Multipurpose Control and Display Unit (MCDU) (Ref. AMM TASK 21-26-00-710-001).
(2) Read the LAST LEG REPORT (Ref. AMM TASK 21-26-00-710-009).
(3) Read the CLASS 3 messages (Ref. AMM TASK 21-26-00-710-008).
4. Fault Isolation
_______________
A. Table of the circuit breakers used in this procedure:
-------------------------------------------------------------------------------PANEL DESIGNATION IDENT. LOCATION -------------------------------------------------------------------------------49VU AIR COND/AVNCS VENT/CTL 6HQ D06
R **ON A/C 001-049, 051-099, 101-149, 151-199, 201-299, 401-499,
123VU AVNCS VENT/EXTC/FAN 2HQ AE02 **ON A/C 301-399,
123VU AVNCS VENT/EXTC/FAN 2HQ AC04 **ON A/C 001-049, 051-099, 101-149, 151-199, 201-299,
B. If the test gives the maintenance message EXTRACT FAN 18HQ:
- do a check of the status of the circuit breaker (2HQ).
(1) If the test also gives the maintenance message PRESSURE SW 30HQ:
- do the trouble shooting procedure (Ref. TASK 21-26-00-810-816).
「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 233
Aug 01/05 CES (2) If the circuit breaker (2HQ) is closed:
- do a check for 115VAC at pins A/J, A/K, A/L of the extract fan (18HQ).
(a) If there is no 115VAC:
- do a check for 115VAC at pins T1, T2, T3 of the extract fan control-contactor (7HQ).
1 If there is no 115VAC:
_
- do a check for a short to ground at the wiring between the extract fan control-contactor (7HQ) pins L1, L2, L3 and the circuit breaker (2HQ) pins A2, B2, C2 (Ref. ASM 21-26/02).
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 EXTRACT FAN (2HQ).
2 If there is 115VAC:
_
- do a check of the status of the circuit breaker (6HQ).
a If the circuit breaker (6HQ) is closed:
_
- do a check for 28VDC at pin A/E of the extract fan (18HQ).
. If there no 28VDC:
* do a check for a short to ground at the wiring between the extract fan (18HQ) pin A/E and the circuit breaker (6HQ) (Ref. ASM 21-26/02).
** 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 (6HQ).
. If there is 28VDC, make sure that the warning light of
the extract fan (18HQ) is off.
* If the warning light is on, push the RESET pushbutton switch on the extract fan (18HQ).
NOTE : The fan can operate immediately.
____ The warning light goes off.
** If the fault continues, replace the FAN-EXTRACT, AVNCS VENT (18HQ).
* If the fault continues, do a check for 28VDC at pin AA/9A of the AEVC (10HQ).
** If there is 28VDC:
「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, 051-099, 101-149, 151-199, ∞∞21-26-00∞∞∞∞∞∞∞∞∞∞Page 234
201-299, May 01/05 CES
*** 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/9A and the extract fan control-contactor
(7HQ) pin Z and between the extract fan control-contactor
(7HQ) pin X and the extract fan (18HQ) pin A/D (Ref. ASM
21-26/02).
*** If the fault continues:
**** replace the CNTOR-EXTRACT FAN CTL, AVNCS VENT (7HQ).
***** If the fault continues:
****** replace the FAN-EXTRACT, AVNCS VENT (18HQ) (Ref. AMM
TASK 21-26-51-000-001) and (Ref. AMM TASK 21-26-51-400-001).
b If the circuit breaker (6HQ) is open:
_ - close the circuit breaker.
. If the circuit breaker trips:
* do a check for a short to ground at the wiring between the extract fan (18HQ) pin A/E and the circuit breaker (6HQ) (Ref. ASM 21-26/02).
** If there is a short to ground:
*** repair the related wiring.
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本文链接地址：A320 Trouble Shooting Manual 排故手册 AIR CONDITIONING 空调1(71)
