-
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/3B of
the BMC2 (1HA2) and the cable 64HF
-connect all the cables or connector disconnected
-disconnect the LOOP CONTROLLER (9240SI) from the BMC2
connector
-install the BMC2 (1HA2) (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 BMC2
connector
1
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-install the BMC2 (1HA2) (Ref. AMM TASK 36-11-34-400-001)
-refer to Para. 4.C.
B. If the test gives the TEST OK message:
-
do a functional test of the bleed air supply system (Ref. AMM TASK 36-11-00-720-004)
-
do the leak check on the bleed air ducts (Ref. AMM TASK 36-22-00-790-001).
-repair the duct which causes the leak.
C. Do the test given in para. 3.
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APU Leak Detection
1. Possible Causes
_______________
-BMC-1 (1HA1)
-CONNECTING CABLE (11HF)
-
OVHT SENS ELEMENT (12HF)
-
OVHT SENS ELEMENT (13HF)
-
OVHT SENS ELEMENT (14HF)
-
OVHT SENS ELEMENT (15HF)
-
OVHT SENS ELEMENT (16HF)
-
OVHT SENS ELEMENT (17HF)
-
OVHT SENS ELEMENT (18HF)
-
OVHT SENS ELEMENT (19HF)
-CABLE ASSY (20HF) R - OVERHEAT SENSING ELEM (84HF)
-wiring
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 36-11-00-740-001 BITE Test of the BMC 1(2)
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 36-22-17-000-001 Removal of the APU Overheat Sensing-Elements
AMM 36-22-17-400-001 Installation of the APU Overheat Sensing-Elements
ASM 36-22/01
3. Fault Confirmation
__________________
A. Test
(1) Do the BITE test of the BMC1 (Ref. AMM TASK 36-11-00-740-001).
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4. Fault Isolation
_______________
R **ON A/C 001-049, 051-099, 101-149, 151-199, 201-299, 401-499,
A. If the test gives the maintenance message:
APU 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 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.B.
(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 APU loop.
(a)
If a sensing element or cable is damaged:
-replace the sensing element or 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.
(b)
If no sensing element is damaged:
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本文链接地址：A320 Trouble Shooting Manual 排故手册 PNEUMATIC(145)
