Failure of the Dual Flow and Shut Off Valve 6YA

TASK 47-11-00-810-803-A
Failure of the Dual Flow and Shut Off Valve 6YA

1. Possible Causes

VALVE-NEA FLOW CTL, IGGS [6YA]
wiring from IGGS CTL UNIT (1YA) pin A/14 to DUAL FLOW SOV (6YA) pin A/9
wiring from IGGS CTL UNIT (1YA) pin A/38 to DUAL FLOW SOV (6YA) pin A/8
wiring from IGGS CTL UNIT (1YA) pin A/82 to DUAL FLOW SOV (6YA) pin A/2
wiring from IGGS CTL UNIT (1YA) pin A/23 to DUAL FLOW SOV (6YA) pin A/12
wiring from IGGS CTL UNIT (1YA) pin A/50 to DUAL FLOW SOV (6YA) pin A/11
wiring from IGGS CTL UNIT (1YA) pin A/60 to DUAL FLOW SOV (6YA) pin A/5
wiring from ground to DUAL FLOW SOV (6YA) pin A/1
wiring from ground to DUAL FLOW SOV (6YA) pin A/4

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
ASM 471101
AMM 47-21-43-000-001	Removal of the Dual-Flow and Shut-off Valve
AMM 47-21-43-400-001	Installation of the Dual-Flow and Shut-off Valve
AMM 47-31-34-740-001	BITE Test of the IGGS with Bleed Air

3. Fault Confirmation
Subtask 47-11-00-740-054-A ** ON A/C NOT FOR ALL

A. Do the BITE test of the IGGS with bleed air AMM 47-31-34-740-001.

4. Fault Isolation
Subtask 47-11-00-810-052-A ** ON A/C NOT FOR ALL

A. Procedure
(1) Replace the VALVE-NEA FLOW CTL, IGGS [6YA] AMM 47-21-43-000-001 and AMM 47-21-43-400-001.
(2) Do the test given in para. 3.
(3) It the fault continues:
(a) Do a check and repair the:

wiring from IGGS CTL UNIT (1YA) pin A/14 to DUAL FLOW SOV (6YA) pin A/9
wiring from IGGS CTL UNIT (1YA) pin A/38 to DUAL FLOW SOV (6YA) pin A/8
wiring from IGGS CTL UNIT (1YA) pin A/82 to DUAL FLOW SOV (6YA) pin A/2
wiring from IGGS CTL UNIT (1YA) pin A/23 to DUAL FLOW SOV (6YA) pin A/12
wiring from IGGS CTL UNIT (1YA) pin A/50 to DUAL FLOW SOV (6YA) pin A/11
wiring from IGGS CTL UNIT (1YA) pin A/60 to DUAL FLOW SOV (6YA) pin A/5
wiring from ground to DUAL FLOW SOV (6YA) pin A/1
wiring from ground to DUAL FLOW SOV (6YA) pin A/4 ASM 471101.

Subtask 47-11-00-740-055-A ** ON A/C NOT FOR ALL

B. Do the test given in para. 3.

NOTE: After the subsequent flight make sure that the fault does not continue.

[Rev.8 from Aug 2018] 2026.04.04 04:34:22 UTC