Flap System Uncommanded Movement

TASK 27-51-00-810-825-A
Flap System Uncommanded Movement

1. Possible Causes

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
AMM 27-50-00-869-006	Reset of the Wing Tip Brake (WTB) of the Flap System on the Ground
AMM 27-51-00-710-001	Operational Test of the Wing Tip Brake and the Pressure Off Brake
AMM 27-51-19-000-001	Removal of the Feed Back Position Pick-Off Unit
AMM 27-51-19-400-001	Installation of the Feed Back Position Pick-Off Unit
AMM 27-54-00-710-001	Operational Test of the Flap System
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
AMM 27-54-52-000-001	Removal of the Pressure-Off Brake of the Flap Power Control Unit
AMM 27-54-52-400-001	Installation of the Pressure-Off Brake of the Flap Power Control Unit

3. Fault Confirmation
Subtask 27-51-00-740-061-A

A. For the fault confirmation, do the fault isolation.

4. Fault Isolation
Subtask 27-51-00-810-074-A

A. Procedure
(1) Do the reset of the WTB's AMM 27-50-00-869-006.
(2) Do the operational test of the flap system AMM 27-54-00-710-001.
(a) If a fault is found, replace the FPPU-FLAP [27CV] , AMM 27-51-19-000-001 and AMM 27-51-19-400-001.
(b) If fault continues, replace the FLAP-PCU [6201CM] , AMM 27-54-51-000-001 and AMM 27-54-51-400-001.
(3) If fault cannot be reproduced on ground, do the test that follows:
(a) Do the operational test of the wing tip brake and the pressure-off brake AMM 27-51-00-710-001 to find the defective system.
(b) Replace the applicable Pressure-off Brake ,
AMM 27-54-52-000-001 and AMM 27-54-52-400-001.

5. Close-up
Subtask 27-51-00-942-075-A

A. Remove the ground support and maintenance equipment, the special and standard tools and all other items.

Subtask 27-51-00-860-077-A

B. Put the aircraft back to its initial configuration.

[Rev.8 from Aug 2018] 2026.04.04 04:27:38 UTC