Flap Position Indication Disagree

TASK 27-51-00-810-833-A
Flap Position Indication Disagree

1. Possible Causes

IPPU-FLAP [3CN]
FWC-1 [1WW1]
FWC-2 [1WW2]
FLAP-PCU [6201CM]

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
AMM 27-54-51-000-001	Removal of the Power Control Unit of the Flap System
AMM 27-54-51-400-001	Installation of the Power Control Unit of the Flap System
ASM 275501
AMM 27-55-11-000-001	Removal of the Instrumentation Position Pick-Off Unit
AMM 27-55-11-400-001	Installation of the Instrumentation Position Pick-Off Unit
AMM 31-53-34-000-001	Removal of the Flight Warning Computer (FWC)
AMM 31-53-34-400-001	Installation of the Flight Warning Computer (FWC)

3. Fault Confirmation
Subtask 27-51-00-740-065-A

A. Make sure of the apparently incorrect Slat/Flap position indications on the ECAM display.

4. Fault Isolation
Subtask 27-51-00-810-083-A

A. If the apparently incorrect Slat/Flap position indications show on the ECAM display:
(1) Replace the IPPU-FLAP [3CN] ,
AMM 27-55-11-000-001 and AMM 27-55-11-400-001.
(2) If the fault continues:

Pull circuit breaker of FWC 1 (1CN):

(a) If the fault does not continue:

Replace the FWC-1 [1WW1] ,
AMM 31-53-34-000-001 and AMM 31-53-34-400-001.

Push the circuit breaker of FWC 1 (1CN).

(3) If the fault continues:

Pull the circuit breaker of FWC 2 (2CN):

(a) If the fault does not continue:

Replace the FWC-2 [1WW2] ,
AMM 31-53-34-000-001 AMM 31-53-34-400-001.

Push the circuit breaker of FWC 2 (2CN).

(4) If the fault continues:

Do a check for 26VAC at the electrical connector of the IPPU 3CN-A/A,B.

(a) If the voltage is correct:

Do a check and repair the aircraft wiring from IPPU (3CN) A/C,D,E to the FWC 1 (1WW1) AA/13B,13C,13D
Do a check and repair the aircraft wiring from IPPU (3CN) B/C,D,E to the FWC 2 (1WW2) AD/13F,13G,13H ASM 275501.

(b) If the voltage is not correct:

Do a check and repair the aircraft wiring from IPPU (3CN) A/A,B to the circuit breaker (1CN) and the ground
Do a check and repair the aircraft wiring from IPPU (3CN) B/A,B to the circuit breaker (2CN) and the ground ASM 275501.

(5) If the fault continues:

Replace the FLAP-PCU [6201CM] ,
AMM 27-54-51-000-001 and AMM 27-54-51-400-001.

[Rev.8 from Aug 2018] 2026.04.04 04:39:13 UTC