Removal of the Line Gearbox

TASK 27-54-47-000-001-A
Removal of the Line Gearbox

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: 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: BE CAREFUL WHEN YOU DO MAINTENANCE TASKS ON THE WING TRAILING EDGE:

DO NOT CAUSE DAMAGE TO THE ELECTRICAL CABLE RACEWAYS.
DO NOT CAUSE DAMAGE TO THE ELECTRICAL CABLE INSTALLATIONS.
MAKE SURE THAT THE ELECTRICAL CABLES ARE INSTALLED CORRECTLY. INCORRECT INSTALLATION CAN CAUSE DAMAGE.

FIN: 6209CM
FIN: 6259CM

1. Reason for the Job
Self explanatory
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	AR	ACCESS PLATFORM 3M (10 FT)
No specific	AR	SAFETY BARRIER(S)
No specific	AR	SAFETY CLIP - CIRCUIT BREAKER
No specific	AR	WARNING NOTICE(S)

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
FOR [6209CM] (FLAP LINE GEARBOX)
573AB
FOR [6259CM] (FLAP LINE GEARBOX)
673AB

C. Referenced Information

REFERENCE	DESIGNATION
TASK 27-50-00-866-008-A	Extension of the Flaps on the Ground
TASK 27-50-00-866-008-A-01	Extension of the Flaps/Slats on the Ground
TASK 27-54-45-000-005-A	Removal of the Torque Shaft
TASK 57-51-37-000-002-A	Removal of the Access Panels 571AB(671AB), 573AB(673AB), 573BB(673BB), 573CB(673CB), 573EB(673EB)
Line Gearbox

3. Job Set-up
Subtask 27-54-47-941-052-A

A. Safety Precautions
(1) Put the SAFETY BARRIER(S) in position.
(2) Put a WARNING NOTICE(S) in position to tell persons not to operate the flap controls.

Subtask 27-54-47-860-051-A

B. Aircraft Maintenance Configuration

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.

(1) Extend the flaps fully (Ref. AMM TASK 27-50-00-866-008).
(2) Install the 98D27803000000 LOCKING TOOL-FLAP SLAT LEVER,INT. POSITION on the flap/slat control lever.

Subtask 27-54-47-865-051-A

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

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C NOT FOR ALL
49VU	FLIGHT CONTROLS/FLP/CTL AND MONG/SYS1	6CV	B07
** ON A/C NOT FOR ALL
49VU	FLIGHT CONTROLS/FLP/CTL AND MONG/SYS1	6CV	B02
** ON A/C ALL
121VU	FLIGHT CONTROLS/FLP/CTL AND/MONG/SYS2	8CV	Q21

Subtask 27-54-47-010-050-A

D. Get Access
(1) Put the ACCESS PLATFORM 3M (10 FT) in the applicable position.
(2) Remove the applicable access panel (Ref. AMM TASK 57-51-37-000-002):
(a) FOR [6209CM] (FLAP LINE GEARBOX)
remove 573AB
(b) FOR [6259CM] (FLAP LINE GEARBOX)
remove 673AB.
(3) Remove the applicable torque shaft that is outboard of the line gearbox (Ref. AMM TASK 27-54-45-000-005):
(a) FOR [6209CM] (FLAP LINE GEARBOX)
remove FIN 6210CM
(b) FOR [6259CM] (FLAP LINE GEARBOX)
remove FIN 6260CM.

4. Procedure

CAUTION: BE CAREFUL WHEN YOU DO MAINTENANCE TASKS ON THE WING TRAILING EDGE:

DO NOT CAUSE DAMAGE TO THE ELECTRICAL CABLE RACEWAYS.
DO NOT CAUSE DAMAGE TO THE ELECTRICAL CABLE INSTALLATIONS.
MAKE SURE THAT THE ELECTRICAL CABLES ARE INSTALLED CORRECTLY. INCORRECT INSTALLATION CAN CAUSE DAMAGE.

Subtask 27-54-47-020-050-A

A. Removal of the Line Gearbox
(1) Disengage the line gearbox (1) from the torque shaft (4) as follows:
(a) Move the retaining ring (3) on to the input shaft of the line gearbox (1), and remove the pin (2) from the torque shaft (4).
(b) Remove the bolts (7) and the washers (6).
(c) Hold the torque shaft (4) and remove the line gearbox (1) from the mounting bracket (5) and the torque shaft (4).

[Rev.10 from 2021] 2026.03.31 23:53:58 UTC