Removal of the Trimmable Horizontal Stabilizer (THS) Leading Edge

TASK 55-12-11-000-001-A
Removal of the Trimmable Horizontal Stabilizer (THS) Leading Edge

WARNING: MAKE SURE THAT THE TRAVEL RANGES OF THE FLIGHT CONTROLS SURFACES ARE CLEAR. MOVEMENT OF FLIGHT CONTROLS CAN CAUSE INJURY TO PERSONS AND/OR DAMAGE TO EQUIPMENT.

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.

WARNING: YOU MUST PUT ON AND ATTACH A SAFETY HARNESS BEFORE YOU START WORK:

ON THE THS OR IN THE REAR FUSELAGE
ON TOP OF THE WINGS OR PYLONS.

WITHOUT A SAFETY HARNESS, YOU CAN FALL. THIS CAN KILL YOU OR CAUSE YOU INJURY.

WARNING: MAKE SURE THAT THE GROUND SAFETY-LOCKS ARE IN POSITION ON THE LANDING GEAR. THIS WILL PREVENT UNWANTED MOVEMENT OF THE LANDING GEAR, AND THUS POSSIBLE INJURY TO PERSONS AND DAMAGE TO THE AIRCRAFT AND/OR EQUIPMENT.

CAUTION: DO NOT CAUSE DAMAGE TO THE SURFACES. THE COMPONENTS ARE MADE OF CARBONFIBER REINFORCED PLASTIC.

ZONE: 331
ZONE: 341

1. Reason for the Job
To get access to the front spar of the spar box.
To replace damaged leading edge sections.
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	AR	ACCESS PLATFORM 4M (13 FT)
No specific	AR	SAFETY CLIP - CIRCUIT BREAKER
No specific	AR	WARNING NOTICE(S)
98D27903500000	2	PIN-SIDE STICK LOCKING

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
331	THS LEADING EDGE
341	THS LEADING EDGE

C. Referenced Information

REFERENCE	DESIGNATION
TASK 29-10-00-864-001-A	Depressurize the Green Hydraulic System
TASK 29-10-00-864-002-A	Depressurize the Yellow Hydraulic System
TASK 29-10-00-864-003-A	Depressurize the Blue Hydraulic System
Trimmable Horizontal Stabilizer Leading-Edge
Trimmable Horizontal Stabilizer Leading Edge Left Hand

3. Job Set-up
Subtask 55-12-11-860-050-A

A. Depressurize Hydraulic Systems
(1) Make sure that the Green, Yellow and Blue hydraulic systems are depressurized (Ref. AMM TASK 29-10-00-864-001), (Ref. AMM TASK 29-10-00-864-002) and (Ref. AMM TASK 29-10-00-864-003).

Subtask 55-12-11-865-050-A

B. Open, safety and tag this(these) circuit breaker(s):

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C NOT FOR ALL
49VU	FLIGHT CONTROLS/THS/ACTR/MOT2	19CE2	B09
** ON A/C NOT FOR ALL
49VU	FLIGHT CONTROLS/THS/ACTR/MOT2	19CE2	B04
** ON A/C ALL
121VU	FLIGHT CONTROLS/THS ACTR/MOT3	19CE3	Q17
121VU	FLIGHT CONTROLS/THS ACTR/MOT1	19CE1	Q16

Subtask 55-12-11-481-050-A

C. Install Locking Devices
(1) Install the 98D27903500000 PIN-SIDE STICK LOCKING in the CAPT and F/O side stick controllers.

Subtask 55-12-11-941-050-A

D. Safety Precautions
(1) Put the WARNING NOTICE(S) in the flight compartment to tell persons not to operate the flight controls.
(2) Put the WARNING NOTICE(S) in position to tell persons not to operate the hydraulic systems.
(3) Put the ACCESS PLATFORM 4M (13 FT) in position at zone 330 for the left hand horizontal stabilizer leading edge and/or zone 340 for the right hand horizontal stabilizer leading edge.

4. Procedure

NOTE: Only the removal of the left hand leading edge is shown. The removal of the right hand leading edge is the same. Identify all hardware for reinstallation.

Subtask 55-12-11-020-058-C

A. Removal of Leading Edge
(1) Remove the inboard and the outboard leading edge (2) and (3).
(a) Remove the screws (4), (5) and (6) from the leading edge sections (2) and (3).
(b) Remove the leading edge sections (2) and (3).
(2) Remove the leading edge intersection (1).
(a) Remove the screws (4) from the leading edge intersection (1).
(b) Remove the leading edge intersection (1).

[Rev.10 from 2021] 2026.04.01 03:50:21 UTC