4. Fault Isolation
_______________
A. If the test is OK, no other maintenance action is necessary.
**ON A/C 001-003, 051-054,
B. This paragraph is only applicable for flow control valves with the part numbers which follow: P/N 751A0000-07 Amendment ABC, P/N 751A0000-07 Amendment BC and, P/N 751B0000-02 Amendment AB.
(1) If the test confirms the fault:
(a) Replace the Flow-Control Valve Filter (Ref. AMM TASK 21-51-51-600-001).
(b) If the fault continues:
- replace the VALVE-FLOW CTL (8HB) (referred to as FCV (8HB)) (Ref. AMM TASK 21-51-51-000-001) and (Ref. AMM TASK 21-51-51-400-001).
R **ON A/C 004-049, 055-099, 101-105, 151-199, 201-299, 301-399,
B. If the test confirms the fault:
- replace the VALVE-FLOW CTL (8HB) (referred to as FCV (8HB)) (Ref. AMM TASK 21-51-51-000-001) and (Ref. AMM TASK 21-51-51-400-001).
R **ON A/C 106-149, 401-499,
B. If the test confirms the fault:
- replace the P2 FLOW CTL SYSTEM (22HB) (Ref. AMM TASK 21-51-51-000-001) and (Ref. AMM TASK 21-51-51-400-001).
R **ON A/C 004-049, 055-099, 101-149, 151-199, 201-299, 301-399,
C. If the fault continues:
- do the inspection of the delta P sense lines (Ref. AMM TASK 21-51-00-200-001).
R **ON A/C 001-049, 051-099, 101-149, 151-199, 201-299, 301-399,
D. If the fault continues:
- do a check of the RELAY-R PACK CLOSE (12HB) and replace it if necessary (Ref. ASM 21-51/02).
(1) If the fault continues:
- do a check of the RELAY-R FCV DISAGREE (14HB) and replace it if necessary (Ref. ASM 21-51/02).
(2) If the fault continues:
- do a check of the BOARD-ANN LT TEST & INTFC (20LP) and replace it if necessary (Ref. ASM 21-51/02).
(3) If the fault continues:
- do a check of the PUSHBUTTON SWITCH-AIR COND/PACK 2 (6HB) and replace it if necessary (Ref. ASM 21-51/02).
(4) If the fault continues:
- do the operational test of the engine interface unit (1KS2) (Ref. AMM TASK 73-25-34-710-040).
(a) If the test gives a different maintenance message refer to the Fault Symptom List.
(5) If the fault continues:
- do a check of the RELAY-ENGINE 2 START (16HB) and replace it if necessary (Ref. ASM 21-51/02).
(6) If the fault continues:
- do a check of the ENG/APU FIRE PNL (1WD) and replace it if necessary (Ref. ASM 21-51/02) and (Ref. ASM 21-51/02).
(7) If the fault continues:
- do a check of the RELAY-RAM AIR CLOSE CTL (3HZ) and replace it if necessary (Ref. ASM 21-51/02).
(8) If the fault continues:
- do a check of the RELAY-ENGINE 1 START (17HB) and replace it if necessary (Ref. ASM 21-51/02).
(9) If the fault continues:
- replace the CONTROLLER-PACK 2 TEMP (27HH) (Ref. AMM TASK 21-61-34-000-001) and (Ref. AMM TASK 21-61-34-400-001).
「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, ∞∞21-51-00∞∞∞∞∞∞∞∞∞∞Page 215
201-299, 301-399, Aug 01/05 CES E. If the fault continues:
- do a check and repair the wiring (Ref. ASM 21-51/01) between:
- the FCU (8HB) and PC (27HH),
- the FCU (8HB) and ground,
- the RELAY (12HB) and the FCU (8HB),
- the RELAY (12HB) and the PC (27HH),
- the RELAY (14HB) and the FCU (8HB) and,
- the RELAY (14HB) and the PC (27HH).
R **ON A/C 401-499,
D. If the fault continues:
- do a check of the RELAY-R PACK CLOSE (12HB) and replace it if necessary (Ref. ASM 21-51/02).
(1) If the fault continues:
- do a check of the RELAY-R FCV DISAGREE (14HB) and replace it if necessary (Ref. ASM 21-51/02).
(2) If the fault continues:
- do a check of the BOARD-ANN LT TEST & INTFC (20LP) and replace it if necessary (Ref. ASM 21-51/02).
(3) If the fault continues:
- do a check of the PUSHBUTTON SWITCH-AIR COND/PACK 2 (6HB) and replace it if necessary (Ref. ASM 21-51/02).
(4) If the fault continues:
- do the operational test of the engine interface unit (1KS2) (Ref. AMM TASK 73-25-34-710-040).
(a) If the test gives a different maintenance message refer to the Fault Symptom List.
(5) If the fault continues:
- do a check of the RELAY-ENGINE 2 START (16HB) and replace it if necessary (Ref. ASM 21-51/02).
(6) If the fault continues:
- do a check of the ENG/APU FIRE PNL (1WD) and replace it if necessary (Ref. ASM 21-51/02) and (Ref. ASM 21-51/02). 中国航空网 www.aero.cn 航空翻译 www.aviation.cn 本文链接地址：A320 Trouble Shooting Manual 排故手册 AIR CONDITIONING 空调1(133)
