Failure of the IGGS Control Unit 1YA detected by CSAS Control Unit 100HW

TASK 47-11-00-810-808-A
Failure of the IGGS Control Unit 1YA detected by CSAS Control Unit 100HW

1. Possible Causes

IGGS CTL UNIT [1YA]
CSAS CONTROL UNIT [100HW]
wiring from IGGS CTL UNIT (1YA) pin A/115 to CSAS CTL UNIT (100HW) pin AB/H11
wiring from IGGS CTL UNIT (1YA) pin A/106 to CSAS CTL UNIT (100HW) pin AB/J11
wiring from IGGS CTL UNIT (1YA) pin A/86 to CSAS CTL UNIT (100HW) pin AB/H12
wiring from IGGS CTL UNIT (1YA) pin A/98 to CSAS CTL UNIT (100HW) pin AB/J12
wiring from IGGS CTL UNIT (1YA) pin A/2 to 103PP (28VDC NORM)
wiring from IGGS CTL UNIT (1YA) pin A/3 to 103PP (28VDC NORM)
wiring from IGGS CTL UNIT (1YA) pin A/4 to 103PP (28VDC NORM)
wiring from IGGS CTL UNIT (1YA) pin A/5 to 103PP (28VDC NORM)
circuit breaker 7YA

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
AMM 21-58-34-000-001	Removal of the CSAS Control Unit
AMM 21-58-34-400-001	Installation of the CSAS Control Unit
ASM 471101
AMM 47-31-34-000-001	Removal of the IGGS Controller Unit
AMM 47-31-34-400-001	Installation of the IGGS Controller Unit
AMM 47-31-34-740-001	BITE Test of the IGGS with Bleed Air

3. Fault Confirmation
Subtask 47-11-00-740-064-A ** ON A/C NOT FOR ALL

A. Do the BITE test of the IGGS without bleed air AMM 47-31-34-740-001.

4. Fault Isolation
Subtask 47-11-00-810-057-A ** ON A/C NOT FOR ALL

A. Procedure
(1) Replace the IGGS CTL UNIT [1YA] AMM 47-31-34-000-001 and AMM 47-31-34-400-001.
(2) Do the test given in para. 3.
(3) If the fault continues:
(a) Replace the CSAS CONTROL UNIT [100HW] AMM 21-58-34-000-001 and AMM 21-58-34-400-001.
(b) Do the BITE test of the IGGS without bleed air AMM 47-31-34-740-001.
(4) If the fault continues:
(a) Do a check and repair the:

wiring from IGGS CTL UNIT (1YA) pin A/115 to CSAS CTL UNIT (100HW) pin AB/H11
wiring from IGGS CTL UNIT (1YA) pin A/106 to CSAS CTL UNIT (100HW) pin AB/J11
wiring from IGGS CTL UNIT (1YA) pin A/86 to CSAS CTL UNIT (100HW) pin AB/H12
wiring from IGGS CTL UNIT (1YA) pin A/98 to CSAS CTL UNIT (100HW) pin AB/J12
wiring from IGGS CTL UNIT (1YA) pin A/2 to 103PP (28VDC NORM)
wiring from IGGS CTL UNIT (1YA) pin A/3 to 103PP (28VDC NORM)
wiring from IGGS CTL UNIT (1YA) pin A/4 to 103PP (28VDC NORM)
wiring from IGGS CTL UNIT (1YA) pin A/5 to 103PP (28VDC NORM) ASM 471101.

(b) Do a check and replace the circuit breaker 7YA .

Subtask 47-11-00-740-065-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 04:34:23 UTC