A320 Trouble Shooting Manual 排故手册 PNEUMATIC(125)_航空信息_民用航空_通用航空

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A. If the fault is identified by the ECAM warning AIR APU BLEED LEAK associated with the FAULT legend on the APU BLEED pushbutton switch:
-release and push the APU BLEED pushbutton switch to clear the warnings.
(1)
If the warning goes out of view:

-no further maintenance action is required.

(2)
If the warning stays in view:

-do the impedance check of the APU overheat detection loop
-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/7B and the ground (Ref. ASM 36-22/01)
-do an impedance check on the LOOP CONTROLLER (9240SI).
(a)
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.B.

(b)
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 the cables on the APU loop.

-replace the sensing element or the cable (Ref. AMM TASK 36-22-17-000-001) and (Ref. AMM TASK 36-22-17-400-001)
-disconnect the LOOP CONTROLLER (9240SI) from the BMC1 connector
-install the BMC1 (Ref. AMM TASK 36-11-34-400-001)
-refer to Para. 4.B.

(d)
If no sensing element is damaged:

-disconnect the connector between the sensing elements 15HF and 16HF
-connect the LOOP CONTROLLER (9240SI) between the connector 1HA1-AA/7B and the ground
-do an impedance check on the LOOP CONTROLLER (9240SI).

(e)
If the impedance is less than 3 KOhms:

-disconnect the connector between the sensing elements 13HF and 14HF
-do an impedance check on the LOOP CONTROLLER (9240SI).
1 If the impedance is less than 3 KOhms:
_
-disconnect the connector between the cable 11HF and the sensing element 12HF
1 -EFF : ALL

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-do an impedance check on the LOOP CONTROLLER (9240SI).
a If the impedance is less than 3 KOhms:
_ -replace the CONNECTING CABLE (11HF) (Ref. AMM TASK 36-22-17-000-001) and (Ref. AMM TASK 36-22-17-400-001)
-do an impedance check on the LOOP CONTROLLER (9240SI)
* If the impedance is less than 3 KOhms:
-do a check and repair the wiring between the pin 7B of the BMC1 connector (1HA1-AA) and the cable 11HF
-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.B.
* 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.B.
b If the impedance is more than 3 KOhms:
_ -disconnect the connector between the sensing elements 12HF and 13HF
-connect the connector between the cable 11HF and the sensing element 12HF
-do an impedance check on the LOOP CONTROLLER (9240SI).
* If the impedance is less than 3 KOhms:
-replace the OVHT SENS ELEMENT (12HF) (Ref. AMM TASK 36-22-17-000-001) and (Ref. AMM TASK 36-22-17-400-001)
-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.B.
* If the impedance is more than 3 KOhms:
-replace the OVHT SENS ELEMENT (13HF) (Ref. AMM TASK 36-22-17-000-001) and (Ref. AMM TASK 36-22-17-400-001)
-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.B.
2 If the impedance is more than 3 KOhms:
_
-connect the connector between the sensing elements 13HF and 14HF
1
R -EFF : 001-049, 051-099, 101-149, 151-199,