-
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
 -EFF : ALL

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 --May 01/04R ---CES -

 -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.
 1
 -EFF : ALL

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 --May 01/04R ---CES -

 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).
 1 -EFF : ALL

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 --May 01/04 ---CES -

 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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