Outflow Valve Electronic Module 1 Fault (52)

TASK 21-31-00-810-831-A
Outflow Valve Electronic Module 1 Fault (52)

1. Possible Causes

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
AMM 21-31-00-710-002	Operational Test of the Pressure Control and Monitoring
AMM 21-31-00-760-001	Resistance Check of the Return Ground Connections - Cabin Pressure Controller (CPC) 1 (11HL) and 2 (12HL) and the Electronic Modules 10HL-1 and 10HL-2
ASM 213102
AMM 21-31-34-000-001	Removal of the Cabin Pressure Controller
AMM 21-31-34-400-001	Installation of the Cabin Pressure Controller
AMM 21-31-51-000-002	Removal of the Outflow Valve (10HL) - Electronics Module 10HL-1 (10HL-2)
AMM 21-31-51-400-002	Installation of the Outflow Valve (10HL) - Electronics Module 10HL-1 (10HL-2)

3. Fault Confirmation
Subtask 21-31-00-710-110-A

A. Test
(1) Do the operational test of the pressure control and monitoring system AMM 21-31-00-710-002.

4. Fault Isolation
Subtask 21-31-00-810-182-A

A. Test Results
(1) If one or both of the reports, LAST LEG REPORT, PREVIOUS LEG REPORT gives the maintenance message which follows,

(2) If one or both of the reports, LAST LEG REPORT, PREVIOUS LEG REPORT gives the maintenance message which follows,

OUTFLOW VALVE ELEC 1 (52) but the test cannot confirm the fault:
replace the VALVE-OUTFLOW (10HL), ELECTRONIC MODULE 1 (referred to as OFV (10HL)) AMM 21-31-51-000-002 and AMM 21-31-51-400-002.

NOTE: The electronic module 1 is connected to the electrical connector 10HL-A.

(3) If the fault continues:

swap the CPC 1 (11HL) and the CPC 2 (12HL) AMM 21-31-34-000-001 and AMM 21-31-34-400-001.

(a) If the fault moves with the CPC 1:

swap back the CPC 1 (11HL) and the CPC 2 (12HL) AMM 21-31-34-000-001 and AMM 21-31-34-400-001 and,
replace the PRESS CONT 1 [11HL] AMM 21-31-34-000-001 and AMM 21-31-34-400-001.

(b) If the fault does not move with the CPC 1:

swap back the CPC 1 (11HL) and the CPC 2 (12HL) AMM 21-31-34-000-001 and AMM 21-31-34-400-001.

1 Do a check and repair the wiring from the:

OFV connector (10HL-A) pins R, P, N, and M to the CPC 1 connector (11HL-AA) pins 7A, 8A, 9A, and 10A ASM 213102.

2 Do a check of the earthing resistance at the return ground connections AMM 21-31-00-760-001 on:

NOTE: The resistance value must be smaller than 20 m.ohms.

Subtask 21-31-00-710-111-A

B. Do the test as given in the Para. 3.A.

[Rev.8 from Aug 2018] 2026.04.04 04:38:50 UTC