DOC AIRBUS | TSM A320FCPC 1 - MCDU Fault
TASK 21-31-00-810-841-A
CPC 1 - MCDU Fault
1. Possible Causes
A. Referenced Information
3. Fault Confirmation
Subtask 21-31-00-710-130-A
Subtask 21-31-00-810-194-B
[Rev.8 from Aug 2018]
2026.04.04 04:24:44 UTC
CPC 1 - MCDU Fault
1. Possible Causes
- PRESS CONT 1 [11HL]
VALVE-OUTFLOW (10HL), ELECTRONIC MODULE 1 - wiring
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 213101 | |
| 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) |
Subtask 21-31-00-710-130-A
A. Test
(1) Do the operational test of the pressure control and monitoring system AMM 21-31-00-710-002.
4. Fault Isolation(1) Do the operational test of the pressure control and monitoring system AMM 21-31-00-710-002.
Subtask 21-31-00-810-194-B
A. If the test cannot be done with the CPC 1:
(2) If the fault does not move with the CPC 1:
VALVE-OUTFLOW (10HL), ELECTRONIC MODULE 1 AMM 21-31-51-000-002 and AMM 21-31-51-400-002.
Subtask 21-31-00-710-131-A - swap the CPC 1 (11HL) and the CPC 2 (12HL) AMM 21-31-34-000-001 and AMM 21-31-34-400-001.
- swap back the CPC 1 (11HL) and the CPC 2 (12HL) AMM 21-31-34-000-001 and AMM 21-31-34-400-001.
(2) 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.
NOTE: The electronic module 1 is connected to the electrical connector 10HL-A.
(3) If the fault continues:- do a check and repair the wiring from the:
- CPC 1 connector (11HL-AA) pins 7A, 8A, 9A and 10A to the OFV connector (10HL-A) pins R, P, N and M ASM 213102.
- do a check of the earthing resistance at the return ground connections AMM 21-31-00-760-001 on:
- the CPC 1 connector 11HL-AC, pin 2 and on,
- the electronic module 1 connector 10HL-A, pin J.
- do a check and repair the wiring from the:
- CPC 1 connector (11HL-AC) pin 3 to the CB (1HL),
- CPC 1 connector (11HL-AC) pins 2, 4 and 13D to the GND ASM 213101.
B. Do the test as given in the Para. 3.A.