(b)
If there is continuity:
-do a visual inspection of the sensing elements on the L wing loop B.
1_ If a sensing element is damaged:
- replace the sensing element.
- install the BMC-2 (1HA2) (Ref. AMM TASK 36-11-34-400-001).
2 If no sensing element is damaged:
_
-do a continuity check of each sensing element, one after the other.
a If there is no continuity on a sensing element:
_
-replace the sensing element: (Ref. AMM TASK 36-22-16-000-001) (Ref. AMM TASK 36-22-16-000-004) (Ref. AMM TASK 36-22-16-000-005) (Ref. AMM TASK 36-22-16-000-006) (Ref. AMM TASK 36-22-16-400-001) (Ref. AMM TASK 36-22-16-400-004)
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(Ref. AMM TASK 36-22-16-400-005) (Ref. AMM TASK 36-22-16-400-007).
-install the BMC-2 (1HA2) (Ref. AMM TASK 36-11-34-400-001).
b If there is continuity on a sensing element:
_
-
do a check and repair the wiring from the connector AA/4D to the sensing element (83HF) (Ref. ASM 36-22/01).
-
do a check and repair the wiring from the sensing element (50HF) to the sensing element (53HF) (Ref. ASM 36-22/01).
-
do a check and repair the wiring from the sensing element (63HF) to the connector AA/5D (Ref. ASM 36-22/01).
-install the BMC-2 (1HA2) (Ref. AMM TASK 36-11-34-400-001).
B. Do the test given in para. 3.
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-EFF : ALL
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Loss of the Leak Detection Loop on the Engine 1 Pylon
1. Possible Causes
_______________
-BMC-1 (1HA1)
-SNSG ELEM-OVHT, ENG 1 PYLON (1HF1)
-wiring
2. Job Set-up Information
______________________
A. 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 36-22-15-000-001 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) Do the BITE test of the BMC1 (Ref. AMM TASK 36-11-00-740-001).
4. Fault Isolation
_______________
A. If the test gives the maintenance message:
ENG1 PYLON LOOP INOP
-remove the BMC-1 (1HA1) (Ref. AMM TASK 36-11-34-000-001)
-do a check of the engine 1 pylon-loop from pin AA/5B of the BMC1 to pin AA/6B of the BMC1 (Ref. ASM 36-22/01).
NOTE : This procedure is related to the loss of the engine 1 pylon-loop
____ detection signal or to incorrect continuity of the loop. The resistance of the loop must be less than 10 ohms at ambient temperature. The BMC gives the maintenance message when the resistance of the loop is more than 75 ohms (discontinuity). There is continuity when the resistance of the loop is less than 75 ohms.
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(1)
If there is continuity:
-replace the BMC-1 (1HA1) (Ref. AMM TASK 36-11-34-400-001).
(a) If the fault continues and the resistance of the loop is between 10 ohms and 75 ohms:
-do a check and clean all the connections (Ref. ASM 36-22/01) to remove contamination and decrease the resistance of the loop.
(2)
If there is no continuity:
-do a check of the wiring from pin AA/5B of the BMC1 to the cable (2HF1) and from pin AA/6B of the BMC1 to the cable (3HF1) (Ref. ASM 36-22/01).
(a)
If there is no continuity:
-repair the wiring from pin AA/5B of the BMC1 to the cable (2HF1) and from pin AA/6B of the BMC1 to the cable (3HF1)
-install the BMC-1 (1HA1) (Ref. AMM TASK 36-11-34-400-001).
(b)
If there is continuity:
-do a check of the sensing element (1HF1).
1 If there is no continuity:
_
-replace the SNSG ELEM-OVHT, ENG 1 PYLON (1HF1) (Ref. AMM TASK 36-22-15-000-001) and (Ref. AMM TASK 36-22-15-400-001)
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