1. Possible Causes
_______________
-BMC-1 (1HA1)
-CABLE-CONNECTING, ENG 1 PYLON (2HF1)
-SNSG ELEM-OVHT, ENG 1 PYLON (1HF1)
-CABLE ASSY (3HF1)
-ducts
-seals
-
wiring between the pin 5B of the BMC1 connector (1HA1-AA) and the cable 2HF1
-
wiring between the pin 6B of the BMC1 connector (1HA1-AA) and the cable 3HF1
2. Job Set-up Information
______________________
A. Fixtures, Tools, Test and Support Equipment
-------------------------------------------------------------------------------REFERENCE QTY DESIGNATION -------------------------------------------------------------------------------
9240SI 1 LOOP CONTROLLER
B. Referenced Information
-------------------------------------------------------------------------------REFERENCE DESIGNATION
-------------------------------------------------------------------------------
AMM 36-11-34-000-001 Removal of the BMC (1HA1, 1HA2)
AMM 36-11-34-400-001 Installation of the BMC (1HA1, 1HA2)
AMM 36-22-15-000-001 Removal of the Pylon Overheat Sensing Element (1HF1,
1HF2) AMM 36-22-15-400-001 Installation of the Pylon Overheat Sensing Element (1HF1, 1HF2) ASM 36-22/01
3. Fault Confirmation
__________________
A. Test
(1)
Start the APU.
(2)
On the AIR control panel 30VU, push the APU BLEED pushbutton switch.
1
-EFF : ALL
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4. Fault Isolation
_______________
A. If the fault is confirmed (ENG BLEED LEAK warning):
-do a leakage check of the ducting.
(1)
If the duct is cracked/damaged:
-replace the defective ducts.
(2)
If there are leaks on the seals:
-replace the defective seals.
NOTE : If there are no air leaks, replace the seals (to prevent
____ leaks).
B. If no leak warning comes into view:
-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/5B 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 engine 1 pylon loop.
(a)
If a sensing element or cable is damaged:
-replace the sensing element or cable (Ref. AMM TASK 36-22-15-000-001) and (Ref. AMM TASK 36-22-15-400-001)
-disconnect the LOOP CONTROLLER (9240SI) from the BMC1 connector
-install the BMC1 (Ref. AMM TASK 36-11-34-400-001)
-refer to Para. 4.C.
(b)
If no sensing element is damaged:
-disconnect the connector between the cable 2HF1 and the sensing element 1HF1
-connect the LOOP CONTROLLER (9240SI) between the connector 1HA1-AA/5B and the ground
-do a check of the impedance read on the LOOP CONTROLLER (9240SI).
1_ If the impedance is less than 3 KOhms:
- replace the CABLE-CONNECTING, ENG 1 PYLON (2HF1) (Ref. AMM
TASK 36-22-15-000-001) and (Ref. AMM TASK 36-22-15-400-001)
- do a check of the impedance read on the LOOP CONTROLLER
(9240SI).
1
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2
_
a_ If the impedance is less than 3 KOhms:
- do a check and repair the wiring between the pin 5B of
the BMC1 connector (1HA1-AA) and the cable 2HF1
- 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.
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
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本文链接地址：A320 Trouble Shooting Manual 排故手册 PNEUMATIC(112)
