NOTE : The overheat detection threshold is between 117 and 131 degrees
____ Celsius. An overheat detection by one loop can occur in these conditions :
-high Outside Air Temperature (OAT),
-ECS supplied with hot bleed air. In these conditions, the ambient air around the sensing elements can increase to the detection threshold but there is not an air leak. If there is an air leak, there will be an AIR L(R) WING LEAK warning on the ECAM. No other maintenance action is necessary if:
-
the overheat detection was by one loop only with high OAT and ECS supplied with hot bleed air,
-
the result of the BMC BITE test is TEST OK.
(1) Do the BITE test of the BMC1 (Ref. AMM TASK 36-11-00-740-001).
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4. Fault Isolation
_______________
A. If the test gives the maintenance message: L 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/3B 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:
-disconnect the LOOP CONTROLLER (9240SI) from the BMC1 connector
-do a visual inspection of the sensing elements and cables on the L 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 36-22-16-000-007), (Ref. AMM TASK 36-22-16-400-008), (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 36-22-18-000-001), (Ref. AMM TASK 36-22-18-400-001), (Ref. AMM TASK 36-22-16-000-006) and (Ref. AMM TASK 36-22-16-400-007)
-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 elements 28HF and 29HF
-connect the LOOP CONTROLLER (9240SI) between the connector 1HA1-AA/3B 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 cables 24HF and 25HF
- 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 81HF and 22HF
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-do a check of the impedance read on the LOOP CONTROLLER (9240SI). . if the impedance is less than 3 KOhms:
-disconnect the connector between the cable 21HF and the
sensing element 81HF
-do a check of the impedance read on the LOOP CONTROLLER
(9240SI)
* if the impedance is less than 3 KOhms: 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(130)
