3. Fault Confirmation
__________________
A. Test
(1) Do the BITE test of the BMC1 (Ref. AMM TASK 36-11-00-740-001).
4. Fault Isolation
_______________
A. If the test gives the maintenance message:
APU LOOP INOP OR BMC IDENT CKT:
-remove the BMC-1 (1HA1) (Ref. AMM TASK 36-11-34-000-001).
-do a continuity check of the APU loop from pin AA/7B of the BMC1 to pin AA/8B of the BMC1 (Ref. ASM 36-22/01).
NOTE : This procedure is related to the loss of the APU-loop detection
____ signal or to incorrect continuity of the loop. The resistance of the loop must be less than 15 ohms at ambient temperature. The BMC gives the maintenance message when the resistance of the loop is more than 75 ohms (discontinuity). There is continuity when the resistance of the loop is less than 75 ohms.
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(1)
If there is continuity:
-do a check for a ground signal at pin AA/9A of the BMC1.
(a)
If there is no ground signal:
-repair the wiring.
-install the BMC-1 (1HA1) (Ref. AMM TASK 36-11-34-400-001).
(b)
If there is a ground signal:
-replace the BMC-1 (1HA1) (Ref. AMM TASK 36-11-34-400-001).
(2)
If there is no continuity:
1_ If the fault continues and the resistance of the loop is
between 15 ohms an d 75 ohms:
- do a check and clean all the connections (Ref. ASM 36-22/01)
to remove contamination and decrease the resistance of the
loop.
-do a check of the wiring from pin AA/7B of the BMC1 to the cable (11HF) and from pin AA/8B of the BMC1 to the cable (20HF) (Ref. ASM 36-22/01).
(a)
If there is no continuity:
-repair the wiring.
-install the BMC-1 (1HA1) (Ref. AMM TASK 36-11-34-400-001).
(b)
If there is continuity:
-do a visual inspection of the sensing elements on the APU loop.
1 If a sensing element is damaged:
_ -replace the sensing element.
-install the BMC-1 (1HA1) (Ref. AMM TASK 36-11-34-400-001).
2 If no sensing element is damaged:
_
-do a continuity check of each sensing element, one after the other.
a If there is no continuity on a sensing element:
_
-replace the sensing element (Ref. AMM TASK 36-22-17-000-001) and (Ref. AMM TASK 36-22-17-400-001).
-install the BMC-1 (1HA1) (Ref. AMM TASK 36-11-34-400-001).
b If there is continuity on a sensing element:
_
-
do a check and repair the wiring from the connector AA/7B to the sensing element (12HF) (Ref. ASM 36-22/01).
-
do a check and repair the wiring from the sensing element (19HF) to the connector AA/8B (Ref. ASM 36-22/01).
-install the BMC-1 (1HA1) (Ref. AMM TASK 36-11-34-400-001).
B. Do the test given in para. 3.
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Loss of the Left-Wing Leak Detection
1.
Possible Causes
_______________
2.
Job Set-up Information
______________________
A. Referenced Information
-------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
36-22-00-810-807 Loss of the Leak Detection Loop A on the Left Wing 36-22-00-810-809 Loss of the Leak Detection Loop B on the Left Wing AMM 36-11-00-740-001 BITE Test of the BMC 1(2)
3. Fault Confirmation
__________________
A. Test
(1) Do the BITE test of the BMC1 and BMC2 (Ref. AMM TASK 36-11-00-740-001).
4. Fault Isolation
_______________
A. If the test gives these two maintenance messages: 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 PNEUMATIC(121)
