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4. Fault Isolation
_______________
A. If the test gives the maintenance message: R WING LOOP A
-remove the BMC1 (1HA1) (Ref. AMM TASK 36-11-34-000-001)
- on the shelf 95VU, connect the LOOP CONTROLLER (9240SI) between the connector 1HA1-AA/4D and the ground (Ref. ASM 36-22/01)
-do a check of the impedance read on the LOOP CONTROLLER (9240SI).
(1)
If the impedance is more than 3 KOhms:
-disconnect the LOOP CONTROLLER (9240SI) from the BMC1 connector
-replace the BMC-1 (1HA1) which is removed (Ref. AMM TASK 36-11-34-000-001) and (Ref. AMM TASK 36-11-34-400-001).
-refer to Para. 4.C.
(2)
If the impedance is less than 3 KOhms:
-do a visual inspection of the sensing elements and cables on the R wing loop A.
(a)
If a sensing element or cable is damaged:
-replace the sensing element or cable (Ref. AMM TASK 36-22-16-000-001), (Ref. AMM TASK 36-22-16-400-001), (Ref. AMM TASK 36-22-16-000-002), (Ref. AMM TASK 36-22-16-400-002), (Ref. AMM TASK 36-22-16-000-003), (Ref. AMM TASK 36-22-16-400-003), (Ref. AMM TASK 36-22-16-000-004), (Ref. AMM TASK 36-22-16-400-004), (Ref. AMM TASK 36-22-16-000-005), (Ref. AMM TASK 36-22-16-400-005), (Ref. AMM TASK 36-22-16-000-006), (Ref. AMM TASK 36-22-16-400-007), (Ref. AMM TASK 36-22-16-000-007), (Ref. AMM TASK 36-22-16-400-008)
-disconnect the LOOP CONTROLLER (9240SI) from the BMC1 connector
-install the BMC1 (Ref. AMM TASK 36-11-34-400-001)
-refer to Para. 4.C.
(b)
If no sensing element is damaged:
-disconnect the connector between the sensing element 42HF and the cable 41HF
-connect the LOOP CONTROLLER (9240SI) between the BMC1 connector 1HA1-AA/4D and the ground
-do a check of the impedance read on the LOOP CONTROLLER (9240SI).
1_ If the impedance is less than 3 KOhms:
- disconnect the connector between the sensing elements 38HF
and 39HF
- do a check of the impedance read or the LOOP CONTROLLER
(9240SI).
a If the impedance is less than 3 KOhms:
_
-disconnect the connector between the sensing elements 80HF and the cable 37HF
-do a check of the impedance read on the LOOP CONTROLLER (9240SI).
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. if the impedance is less than 3 KOhms:
-replace the CABLE-CONNECTING, R WING LOOP A (37HF) (Ref. AMM TASK 36-22-16-000-002) and (Ref. AMM TASK 36-22-16-400-002)
-do a check of the impedance read on the LOOP CONTROLLER (9240SI)
* if the impedance is less than 3 KOhms:
-do a check and repair the wiring between the pin AA/4D of the BMC1 (1HA1) and the cable 37HF
-connect all the cables or connectors disconnected
-disconnect the LOOP CONTROLLER (9240SI) from the BMC1 connector
-install the BMC1 (1HA1) (Ref. AMM TASK 36-11-34-400-001)
-refer to Para. 4.C.
* if the impedance is more than 3 KOhms:
-connect all the cables or connectors disconnected
-disconnect the LOOP CONTROLLER (9240SI) from the BMC1 connector
-install the BMC1 (1HA1) (Ref. AMM TASK 36-11-34-400-001)
-refer to Para. 4.C.
. if the impedance is more than 3 KOhms:
-disconnect the connector between the sensing elements 80HF and 38HF
-connect the connector between the sensing element 80HF and the cable 37HF
-do a check of the impedance read on the LOOP CONTROLLER (9240SI)
* if the impedance is less than 3 KOhms:
-replace the SNSG ELEM-OVHT, R WING LOOP A (80HF) (Ref. AMM TASK 36-22-16-000-001) and (Ref. AMM TASK 36-22-16-400-001)
-connect all the cables or connectors disconnected
-disconnect the LOOP CONTROLLER (9240SI) from the BMC1 connector
-install the BMC1 (1HA1) (Ref. AMM TASK 36-11-34-400-001)
-refer to Para. 4.C.
* if the impedance is more than 3 KOhms:
-replace the SNSG ELEM-OVHT, R WING LOOP A (38HF) (Ref. AMM TASK 36-22-16-000-006) and (Ref. AMM TASK 36-22-16-400-007)
-connect all the cables or connectors disconnected
-disconnect the LOOP CONTROLLER (9240SI) from the BMC1 connector
-install the BMC1 (1HA1) (Ref. AMM TASK 36-11-34-400-001)
-refer to Para. 4.C.
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本文链接地址：A320 Trouble Shooting Manual 排故手册 PNEUMATIC(139)
