Leak Detection on the Engine 1 Pylon

TASK 36-22-00-810-830-A
Leak Detection on the Engine 1 Pylon

1. Possible Causes

2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
9240SI	1	CONTROLLER-LOOP

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
AMM 36-11-34-400-001	Installation of the BMC
ASM 362201
AMM 36-22-15-000-001	Removal of the Pylon Overheat Sensing-Element
AMM 36-22-15-400-001	Installation of the Pylon Overheat Sensing-Element

3. Fault Confirmation
Subtask 36-22-00-710-085-A ** ON A/C NOT FOR ALL

A. Test
(1) Do the BITE test of the BMC1 AMM 36-11-00-740-001.

4. Fault Isolation
Subtask 36-22-00-810-080-A ** ON A/C NOT FOR ALL

A. If the test gives the maintenance message:
ENG1 PYLON LOOP

remove the BMC1 (1HA1) AMM 36-11-34-000-001
on the shelf 95VU, connect the 9240SI CONTROLLER-LOOP between the connector 1HA1-AA/5B and the ground ASM 362201
do a check of the impedance read on the 9240SI CONTROLLER-LOOP.

(1) If the impedance is more than 17 KOhms:

disconnect the 9240SI CONTROLLER-LOOP from the BMC1 connector
replace the BMC-1 [1HA1] which is removed AMM 36-11-34-000-001 and AMM 36-11-34-400-001.
refer to Para. 4.B.

(2) If the impedance is less than 17 KOhms:

disconnect the 9240SI CONTROLLER-LOOP 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 AMM 36-22-15-000-001 and AMM 36-22-15-400-001
disconnect the 9240SI CONTROLLER-LOOP from the BMC1 connector
install the BMC1 AMM 36-11-34-400-001
refer to Para. 4.B.

(b) If no sensing element is damaged:

disconnect the connector between the cable 2HF1 and the sensing element 1HF1
connect the 9240SI CONTROLLER-LOOP between the connector 1HA1-AA/5B and the ground
do a check of the impedance read on the 9240SI CONTROLLER-LOOP.

1 If the impedance is less than 17 KOhms:

replace the CABLE-CONNECTING, ENG 1 PYLON [2HF1] AMM 36-22-15-000-001 and AMM 36-22-15-400-001
do a check of the impedance read on the 9240SI CONTROLLER-LOOP.

a If the impedance is less than 17 KOhms:

do a check and repair the wiring between the pin AA/5B of the BMC1 (1HA1) and the cable 2HF1
connect all the cables or connectors disconnected
disconnect the 9240SI CONTROLLER-LOOP from the BMC1 connector
install the BMC1 (1HA1) AMM 36-11-34-400-001
refer to Para. 4.B.

b If the impedance is more than 17 KOhms:

2 If the impedance is more than 17 KOhms:

a If the impedance is less than 302 KOhms:

b If the impedance is more than 302 KOhms:

Subtask 36-22-00-710-086-A ** ON A/C NOT FOR ALL

B. Do the test given in Para. 3.

[Rev.8 from Aug 2018] 2026.04.04 04:34:06 UTC