Detailed Inspection of Outer Wing, Bottom Skin Upper Surface Butt Straps at Stringer 8 and Stringer 11, between RIB8 and RIB21

TASK 57-21-00-200-026-A
Detailed Inspection of Outer Wing, Bottom Skin Upper Surface Butt Straps at Stringer 8 and Stringer 11, between RIB8 and RIB21

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: BE CAREFUL WHEN YOU USE CONSUMABLE MATERIALS. OBEY THE MATERIAL MANUFACTURER'S INSTRUCTIONS AND YOUR LOCAL REGULATIONS.

ZONE: 540
ZONE: 640

1. Reason for the Job
Refer to the MPD TASK: 572155-01
DETAILED INSPECTION OF OUTER WING, BOTTOM SKIN UPPER SURFACE BUTT STRAPS AT STRINGER 8 AND STRINGER 11, BETWEEN RIB 8 AND RIB 21

NOTE: The effectivity of this task is ALL. To know if this task is applicable for your aircraft, refer to the MPD task applicability and the weight variant data given in the SRM introduction.

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	SAFETY BARRIER(S)
No specific	1	WARNING NOTICE(S)
98D27803500001	1	LOCKING TOOL ZERO POS

B. Consumable Materials

REFERENCE	DESIGNATION
(Material No.08BAA9)	Non Aqueous Cleaner-General - -
(Material No.14SBA1)	Textile-Lint free Cotton -

C. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
540	FUEL TANK
640	FUEL TANK
540CB, 540DB, 540EB, 540FB, 540GB, 540HB, 540JB, 540KB, 540LB, 540MB, 540NB, 540PB, 540QB, 640CB, 640DB, 640EB, 640FB, 640GB, 640HB, 640JB, 640KB, 640LB, 640MB, 640NB, 640PB, 640QB

D. Referenced Information

REFERENCE	DESIGNATION
TASK 12-11-28-650-003-A	Pressure Refuel with Automatic Control
TASK 28-10-00-910-001-A	Safety Procedures When You Do Work in a Fuel Tank
TASK 28-10-00-910-002-A	Access to the Fuel Tanks and the Work Areas
TASK 28-12-46-000-001-A	Removal of the Overpressure Protector Outlet
TASK 28-12-46-400-001-A	Installation of the Overpressure Protector Outlet
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 28-25-00-869-001-A	Fuel Transfer
TASK 57-27-11-000-001-A	Removal of the Access Panel
TASK 57-27-11-000-002-A	Removal of the Access Panel
TASK 57-27-11-400-001-A	Installation of the Access Panel
TASK 57-27-11-400-002-A	Installation of the Access Panel
SRM 572100	(for corrective action)
Outer Wing Bottom Skin - RIB8 thru RIB21

3. Job Set-up
Subtask 57-21-00-941-076-A

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

Subtask 57-21-00-650-078-A

B. Fuel Configuration
(1) Defuel the applicable fuel tank (Ref. AMM TASK 28-25-00-650-001).
(2) Drain the remaining fuel from the applicable fuel tank (Ref. AMM TASK 28-25-00-650-003).

Subtask 57-21-00-010-069-A ** ON A/C NOT FOR ALL

C. Get Access
(1) Put the ACCESS PLATFORM 3M (10 FT)- ADJUSTABLE in position below the applicable wing fuel tank, zone 540 (640).
(2) Remove the applicable access panels (Ref. AMM TASK 57-27-11-000-001) (Ref. AMM TASK 57-27-11-000-002) (Ref. AMM TASK 28-12-46-000-001) and (Ref. AMM TASK 28-10-00-910-002):

for the left wing, remove 540CB 540DB 540EB 540FB 540GB 540HB 540JB 540KB 540LB 540MB 540NB 540PB 540QB
for the right wing, remove 640CB 640DB 640EB 640FB 640GB 640HB 640JB 640KB 640LB 640MB 640NB 640PB 640QB.

Subtask 57-21-00-010-069-B ** ON A/C NOT FOR ALL

for the left wing, remove 540CB 540DB 540EB 540FB 540GB 540HB 540JB 540KB 540LB 540MB 540NB 540PB 540QB
for the right wing, remove 640CB 640DB 640EB 640FB 640GB 640HB 640JB 640KB 640LB 640MB 640NB 640PB 640QB.

4. Procedure
Subtask 57-21-00-110-075-A

A. Preparation for Inspection
(1) Use a clean Textile-Lint free Cotton - (Material No.14SBA1) , made moist with Non Aqueous Cleaner-General - - (Material No.08BAA9) , to clean the upper-surface of the bottom-skin butt strap at the stringers 8 thru 11 (RIB8 thru RIB21).

Subtask 57-21-00-210-079-A

B. Inspection
(1) Examine the upper surface of the bottom butt straps at stringers 8 and 11 (RIB8 thru RIB21). Make sure that:

there is no corrosion or damage
there are no scratches or scores
there are no loose or damaged fasteners
the surface protection is in the correct condition.

NOTE: If necessary, refer to the SRM 572100 for the correct repair procedure.

5. Close-up
Subtask 57-21-00-410-069-A ** ON A/C NOT FOR ALL

A. Close Access
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Install the applicable access panels (Ref. AMM TASK 57-27-11-400-001), (Ref. AMM TASK 57-27-11-400-002) and (Ref. AMM TASK 28-12-46-400-001):

for the left wing, install 540CB 540DB 540EB 540FB 540GB 540HB 540JB 540KB 540LB 540MB 540NB 540PB 540QB
for the right wing, install 640CB 640DB 640EB 640FB 640GB 640HB 640JB 640KB 640LB 640MB 640NB 640PB 640QB.

Subtask 57-21-00-410-069-B ** ON A/C NOT FOR ALL

for the left wing, install 540CB 540DB 540EB 540FB 540GB 540HB 540JB 540KB 540LB 540MB 540NB 540PB 540QB
for the right wing, install 640CB 640DB 640EB 640FB 640GB 640HB 640JB 640KB 640LB 640MB 640NB 640PB 640QB.

Subtask 57-21-00-650-079-A

B. Fuel Configuration
(1) Refuel (Ref. AMM TASK 12-11-28-650-003), defuel (Ref. AMM TASK 28-25-00-650-001) or transfer fuel (Ref. AMM TASK 28-25-00-869-001) as necessary.

Subtask 57-21-00-942-075-A

C. Removal of Equipment
(1) Remove the safety barriers.
(2) Remove the access platform(s).
(3) Remove the 98D27803500001 LOCKING TOOL ZERO POS from the flap/slat control lever.
(4) Remove the WARNING NOTICE(S).
(5) Remove the ground support and maintenance equipment, the special and standard tools and all other items.

[Rev.10 from 2021] 2026.04.01 02:10:27 UTC