RH Wing Loop B Inoperative

TASK 36-22-00-810-839-A
RH Wing Loop B Inoperative

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
TSM TASK 36-22-00-810-878-A	Leak Detection from the Loop B in the Right Wing
ESPM 204422
AMM 36-11-00-740-802	BITE Test of the Engine Bleed Air System (EBAS) (System Test)
AMM 36-11-34-000-001	Removal of the BMC
AMM 36-11-34-400-001	Installation of the BMC
AMM 36-22-00-100-803	Clean the Overheat Detection System (OHDS) Connectors and Apply the Electrical Insulating Compound
ASM 362201
AWM 362202
AMM 36-22-16-000-001	Removal of the Overheat Sensing Elements
AMM 36-22-16-000-002	Removal of the Cables
AMM 36-22-16-000-003	Removal of the Cables
AMM 36-22-16-000-004	Removal of the Overheat Sensing Elements
AMM 36-22-16-000-005	Removal of the Overheat Sensing Elements
AMM 36-22-16-000-006	Removal of the Overheat Sensing Elements
AMM 36-22-16-000-007	Removal of the Cables
AMM 36-22-16-400-001	Installation of the Overheat Sensing Elements
AMM 36-22-16-400-002	Installation of the Cables
AMM 36-22-16-400-003	Installation of the Cables
AMM 36-22-16-400-004	Installation of the Overheat Sensing Elements
AMM 36-22-16-400-005	Installation of the Overheat Sensing Elements
AMM 36-22-16-400-007	Installation of the Overheat Sensing Elements
AMM 36-22-16-400-008	Installation of the Cables

3. Fault Confirmation
Subtask 36-22-00-740-054-A ** ON A/C NOT FOR ALL

A. Test
(1) Do the BITE test of the EBAS AMM 36-11-00-740-802.

4. Fault Isolation
Subtask 36-22-00-810-096-B ** ON A/C NOT FOR ALL

A. If the test gives the maintenance message R WING LOOP B INOP or R WING LOOP B OPEN:

NOTE: This procedure is applicable when there is a loss of the RH wing loop-B detection-signal or to the incorrect continuity of the loop.

Remove BMC-2 AMM 36-11-34-000-001.
On shelf 96VU, connect the 9240SI CONTROLLER-LOOP between BMC-2 pin AA/4F and AA/5F ASM 362201.
Do a check of the continuity resistance shown on the 9240SI CONTROLLER-LOOP:

(1) If the continuity resistance value is less than 16.5 Ohms:

On shelf 96VU, connect the 9240SI CONTROLLER-LOOP between connector BMC-2 pin AA/4F and the ground ASM 362201.
Do a check of the insulation resistance shown on the 9240SI CONTROLLER-LOOP.

(a) If the insulation resistance is more than 10 kOhms:

(b) If the insulation resistance is less than 10 kOhms:

(2) If the continuity resistance value is more than 16.5 Ohms

Connect the 9240SI CONTROLLER-LOOP between connector 1968VC pin A/20 to connector 1900VC pin A/28 AWM 362202.

(a) If the continuity resistance value is more than 16.5 Ohms:

Do a visual inspection of the sensing elements and the connecting cables on RH wing loop B.

1 If a sensing element or a connecting cable is damaged:

2 If no sensing elements or connecting cables are damaged:

(b) If the continuity resistance value is less than 16.5 Ohms:

Connect the 9240SI CONTROLLER-LOOP between connector 1968VC pin A/20 and BMC-2 pin AA/4F AWM 362202.

1 If the continuity resistance value is more than 16.5 Ohms:

Disconnect the 9240SI CONTROLLER-LOOP from connector 1968VC pin A/20 and BMC-2 pin AA/4F.
Repair or replace the wiring ESPM 204422.
Install BMC-2 AMM 36-11-34-400-001.

2 If the continuity resistance value is less than 16.5 Ohms:

Connect the 9240SI CONTROLLER-LOOP between connector 1900VC pin A/28 and BMC-2 pin AA/5F AWM 362202.

a If the continuity resistance value is more than 16.5 Ohms:

b If the continuity resistance value is less than 16.5 Ohms:

Do the cleaning procedure AMM 36-22-00-100-803.
Do the BITE test of the EBAS AMM 36-11-00-740-802.
* If the fault continues:
** Replace BMC-2 [1HA2] AMM 36-11-34-000-001 and AMM 36-11-34-400-001.

Subtask 36-22-00-810-208-A ** ON A/C NOT FOR ALL

B. Dichotomy Procedure

NOTE: The purpose of this procedure is to find and isolate the elements that causes a high continuity resistance on loop-B of the RH wing.

(1) Do a check of the continuity resistance shown on the 9240SI CONTROLLER-LOOP:
(a) If the continuity resistance value is more than 16.5 Ohms:

Disconnect the connecting cable (76HF) of connector 1968VC pin A/20 and the connecting cable (64HF) of the connector 1900VC pin A/28 AMM 36-22-16-000-002. Disconnect one after the other all the sensing elements between the connection cables (76HF) and (64HF) AMM 36-22-16-000-001, AMM 36-22-16-000-003, AMM 36-22-16-000-007, AMM 36-22-16-000-004, AMM 36-22-16-000-005 and AMM 36-22-16-000-006.
Measure the continuity resistance with the 9240SI CONTROLLER-LOOP between the center pin on the two ends of each of the elements.
Do a check of the continuity resistance shown on the 9240SI CONTROLLER-LOOP:

1 If the continuity resistance value is more than 16.5 Ohms:

2 If the continuity resistance value is less than 16.5 Ohms:

Disconnect the 9240SI CONTROLLER-LOOP.
Clean all the connections of the sensing elements and the connecting cables to remove contamination and decrease the resistance of the loop AMM 36-22-00-100-803 AWM 362202.
Connect again all the sensing elements or connecting cables disconnected AMM 36-22-16-400-001, AMM 36-22-16-400-002, AMM 36-22-16-400-003, AMM 36-22-16-400-008, AMM 36-22-16-400-004, AMM 36-22-16-400-005 and AMM 36-22-16-400-007.
Install BMC-2 AMM 36-11-34-400-001.

(b) If the continuity resistance value is less than 16.5 Ohms:

[Rev.8 from Aug 2018] 2026.04.04 04:34:07 UTC