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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/3B to the sensing element (82HF) (Ref. ASM 36-22/01).
-
do a check and repair the wiring from the sensing element (66HF) to the sensing element (69HF) (Ref. ASM 36-22/01).
-
do a check and repair the wiring from to the sensing element (75HF) to the connector AA/4B (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.
1
-EFF : ALL
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Loss of the Leak Detection Loop B on the Left Wing
1. Possible Causes
_______________
-BMC-2 (1HA2)
-wiring
-sensing element
-
wiring from the connector AA/4D to the sensing element (83HF)
-
wiring from the sensing element (50HF) to the sensing element (53HF)
-
wiring from the sensing element (63HF) to the connector AA/5D
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 36-22-16-000-001 Removal of the Overheat Sensing Elements
29HF(45HF),56HF(72HF),81HF(80HF),83HF (82HF) AMM 36-22-16-000-004 Removal of the Overheat Sensing Elements 26HF(42HF),53HF(69HF) AMM 36-22-16-000-005 Removal of the Overheat Sensing Elements 27HF(43HF),50HF(66HF),23HF(39HF),54HF (70HF) AMM 36-22-16-000-006 Removal of the Overheat Sensing Elements 28HF(44HF),49HF(65HF),55HF(71HF), 22HF(38HF) AMM 36-22-16-400-001 Installation of the Overheat Sensing Elements 29HF(45HF),56HF(72HF),81HF(80HF), 83HF(82HF) AMM 36-22-16-400-004 Installation of the Overheat Sensing Elements 26HF(42HF),53HF(69HF) AMM 36-22-16-400-005 Installation of the Overheat Sensing Elements 27HF(43HF),50HF(66HF),23HF(39HF), 54HF(70HF) AMM 36-22-16-400-007 Installation of the Overheat Sensing Elements 28HF(44HF),49HF(65HF),55HF(71HF), 22HF(38HF) ASM 36-22/01
3. Fault Confirmation
__________________
A. Test
(1) Do the BITE test of the BMC2 (Ref. AMM TASK 36-11-00-740-001).
1
-EFF : ALL
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4. Fault Isolation
_______________
A. If the test gives the maintenance message: L WING LOOP B INOP
-remove the BMC-2 (1HA2) (Ref. AMM TASK 36-11-34-000-001).
-do a continuity check of the L wing loop B from pin AA/4D of the BMC2 to pin AA/5D of the BMC2 (Ref. ASM 36-22/01).
NOTE : This procedure is related to the loss of the wing-loop detection
____ signal or to incorrect continuity of the loop. The resistance of the loop must be less than 15 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.
(1)
If there is continuity:
-replace the BMC-2 (1HA2) (Ref. AMM TASK 36-11-34-400-001).
(a) If the fault continues and the resistance of the loop is between 15 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/4D of the BMC2 to the cable (77HF) and from pin AA/5D of the BMC2 to the cable (57HF) (Ref. ASM 36-22/01).
(a)
If there is no continuity:
-repair the wiring.
-install the BMC-2 (1HA2) (Ref. AMM TASK 36-11-34-400-001).
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