Check the Indicator of the No-Back Wear Detection-Device of the THS-Actuator

TASK 27-44-51-210-003-A
Check the Indicator of the No-Back Wear Detection-Device of the THS-Actuator

WARNING: PUT THE SAFETY DEVICES AND THE WARNING NOTICES IN POSITION BEFORE YOU START A TASK ON OR NEAR:

THE FLIGHT CONTROLS
THE FLIGHT CONTROL SURFACES
THE LANDING GEAR AND THE RELATED DOORS
COMPONENTS THAT MOVE.

MOVEMENT OF COMPONENTS CAN KILL OR CAUSE INJURY TO PERSONS AND/OR CAN CAUSE DAMAGE TO THE EQUIPMENT.

ZONE: 310
FIN: 9CE

1. Reason for the Job
Refer to the MPD TASK: 274451-03
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	1	ACCESS PLATFORM 3M (10 FT)- ADJUSTABLE
No specific	AR	FLASHLIGHT
No specific	AR	WARNING NOTICE(S)

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
310	FUSLG TAIL SECTION AFT OF AFT PRESS BHD
312AR

C. Referenced Information

REFERENCE	DESIGNATION
TASK 27-44-51-000-001-A	Removal of the Trimmable Horizontal Stabilizer (THS) Actuator
TASK 27-44-51-400-001-A	Installation of the Trimmable Horizontal Stabilizer (THS) Actuator
Detection Device - Actuator No-Back Wear

3. Job Set-up
Subtask 27-44-51-010-055-A

A. Get Access
(1) Put the ACCESS PLATFORM 3M (10 FT)- ADJUSTABLE in position.
(2) Open the access door 312AR.
(3) Put the WARNING NOTICE(S) in the cockpit to tell persons not to operate the pitch controls.

4. Procedure
Subtask 27-44-51-210-056-A

A. Examine the indicator of the detection device.
(1) Use a FLASHLIGHT and examine the detection device (30).
(a) Make sure that the red pop-out (31) is not released.
(b) If the red pop-out (31) is released, examine the position of the roller (32) on the detection device (30)

Detection Device - Actuator No-Back Wear

1 If the roller (32) is in the position "TRIPPED BY VIBRATION", reset the red pop-out (31):

Push the roller (32) with a tool, for example a small screwdriver, in the reset position.

2 If the roller (32) is in the position "TRIPPED BECAUSE OF "NO BACK" WEAR", replace the THS-Actuator (Ref. AMM TASK 27-44-51-000-001) and (Ref. AMM TASK 27-44-51-400-001).

5. Close-up
Subtask 27-44-51-410-055-A

A. Close Access
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Close the access door 312AR.
(3) Remove the WARNING NOTICE(S).
(4) Remove the access platform(s).

[Rev.8 from Aug 2017] 2026.03.31 23:51:39 UTC