Removal of the Closing Panel

TASK 57-27-11-000-007-A
Removal of the Closing Panel

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: 540
ZONE: 640

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

REFERENCE	QTY	DESIGNATION
No specific	1	ACCESS PLATFORM 5M (16 FT)- ADJUSTABLE
No specific	AR	SAFETY BARRIER(S)
No specific	1	WARNING NOTICE(S)
98D27803500001	1	LOCKING TOOL ZERO POS

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
540	FUEL TANK
640	FUEL TANK
521AZ, 521BZ, 521CZ, 540BB, 621AZ, 621BZ, 621CZ, 640BB

C. Referenced Information

REFERENCE	DESIGNATION
TASK 28-10-00-910-001-A	Safety Procedures When You Do Work in a Fuel Tank
TASK 28-25-00-650-001-A	Pressure Defuel
TASK 28-25-00-650-003-A	To Drain Remaining Fuel from the Wing Tanks and the Center Tank
TASK 28-25-00-650-003-A-01	To Drain Remaining Fuel from the Wing Tanks and the Center Tank
TASK 57-27-11-000-001-A	Removal of the Access Panel
TASK 57-27-11-000-005-A	Removal of the Access Panel
Closing Panels 540CZ(640CZ)/540DZ(640DZ) ** ON A/C NOT FOR ALL
Closing Panels 540CZ(640CZ) and 540DZ(640DZ) ** ON A/C NOT FOR ALL

3. Job Set-up
Subtask 57-27-11-941-060-A ** ON A/C NOT FOR ALL

A. Safety Precautions

WARNING: BEFORE YOU DO WORK IN OR NEAR A FUEL TANK, MAKE SURE THAT YOU OBEY ALL THE SAFETY PROCEDURES. THIS WILL PREVENT INJURY TO PERSONS AND/OR DAMAGE TO THE AIRCRAFT.

(1) Obey the fuel safety procedures when you do the work in a fuel tank (Ref. AMM TASK 28-10-00-910-001).
(2) As necessary, use the applicable SAFETY BARRIERS, specified by the operator's instructions and your local regulations.
(3) Install the 98D27803500001 LOCKING TOOL ZERO POS on the flap/slat control lever.
(4) Put the WARNING NOTICE(S) in position in the cockpit to tell persons not to operate the flaps or slats.

Subtask 57-27-11-650-069-A ** ON A/C NOT FOR ALL

B. Fuel Configuration
(1) Put the ACCESS PLATFORM 5M (16 FT)- ADJUSTABLE in position below the wing fuel tank at zone 540(640).
(2) Defuel the aircraft (Ref. AMM TASK 28-25-00-650-001).
(3) Drain the remaining fuel from the applicable fuel tank(s) (Ref. AMM TASK 28-25-00-650-003).

Subtask 57-27-11-010-058-A ** ON A/C NOT FOR ALL

C. Get Access
(1) Remove access panel 540BB( 640BB) (Ref. AMM TASK 57-27-11-000-001).
(2) Remove access panels 521AZ( 621AZ), 521BZ( 621BZ) and 521CZ( 621CZ) (Ref. AMM TASK 57-27-11-000-005).

4. Procedure
Subtask 57-27-11-020-056-B ** ON A/C NOT FOR ALL

A. Removal of the Closing Panels

NOTE: There are two different types of closing panel. Some aircraft will have pre modification 26839 (composite) closing panels. Some aircraft will have post modification 26839 (solid alloy) closing panels.

(1) On aircraft with pre modification 26839 (composite) closing panels:
(a) Remove the bolts (4) and the washers (3) from the closing panel (2) in a diagonally opposite sequence.
(b) Remove the closing panel (2).
(c) Identify the closing panel (2) with a label.
(2) On aircraft with post modification 26839 (solid alloy) closing panels:
(a) Remove the bolts (4) from the closing panel (2) in a diagonally opposite sequence.
(b) Remove the closing panel (2).

Subtask 57-27-11-020-056-D ** ON A/C NOT FOR ALL

A. Removal of the Closing Panel
(1) Remove the bolts (4) and the washers (3) from the closing panel (2) in a diagonally-opposite sequence.
(2) Remove the closing panel (2).

[Rev.10 from 2021] 2026.04.01 03:54:18 UTC