Visual Check of THS Actuator Threaded Nut (Fail-Safe Nut)

TASK 27-44-51-210-002-A
Visual Check of THS Actuator Threaded Nut (Fail-Safe Nut)

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: 274451-06
VISUAL CHECK OF THS ACTUATOR THREADED NUT (FAIL SAFE NUT)
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	1	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
Ball Screw Nut, Ball Screw and Claw Stops

3. Job Set-up
Subtask 27-44-51-010-054-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 27-44-51-210-055-A

A. Do a visual check of the threaded (fail-safe) nut
(1) Use a FLASHLIGHT and do a visual check of the fail-safe nut (23) from the upper side of the nut assembly (8) for:

cracks,
corrosion,
damage.

5. Close-up
Subtask 27-44-51-410-054-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.10 from 2021] 2026.03.31 23:51:26 UTC