Special Detailed Inspection (HFEC and US) of Outer Wing, Bottom Skin Lower Surface at Fuel Pump Apertures and Adjacent Holes between Rib 1 and Rib 2

TASK 57-20-00-280-803-A
Special Detailed Inspection (HFEC and US) of Outer Wing, Bottom Skin Lower Surface at Fuel Pump Apertures and Adjacent Holes between Rib 1 and Rib 2

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

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.

CAUTION: DO NOT APPLY TEMPORARY PROTECTION SYSTEM (TPS) ON THE INSPECTION AREA. IF YOU APPLY TPS ON THE INSPECTION AREA, YOU CAN CAUSE DAMAGE TO THE AIRCRAFT.

ZONE: 540
ZONE: 640

1. Reason for the Job
Refer to the MPD TASK: 572054-03
SPECIAL DETAILED INSPECTION (HFEC AND US) OF OUTER WING, BOTTOM SKIN LOWER SURFACE AT FUEL PUMP APERTURES AND ADJACENT HOLES BETWEEN RIB 1 AND RIB 2.

NOTE: The effectivity of this task is "ALL". To know if this task is applicable to your aircraft, refer to the MPD task applicability.

NOTE: To do this task, fuel pumps 21QA(26QA) and 25QA(22QA) must be removed.

2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	1	ACCESS PLATFORM 3M (10 FT)
No specific	1	AIR SOURCE FILTERED, DRY
No specific	AR	SAFETY BARRIER(S)
No specific	AR	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

D. Referenced Information

REFERENCE	DESIGNATION
TASK 28-00-00-910-001-A	Fuel Safety Procedures
TASK 28-21-51-000-001-A	Removal of the Fuel Pumps
TASK 28-21-51-400-001-A	Installation of the Fuel Pumps
TASK 51-78-00-916-001-A	Application of Temporary Protection System (TPS)
SRM 511100
SRM 512200
NTM 572054
SRM 512300	(for corrective action)
SRM 512400	(for corrective action)
Openings - Fuel Pumps 25QA(22QA) and 21QA(26QA)

3. Job Set-up
Subtask 57-20-00-941-117-A

A. Safety Precautions

WARNING: OBEY THE FUEL SAFETY PROCEDURES.

(1) Obey the fuel safety procedures (Ref. AMM TASK 28-00-00-910-001).
(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 the slats.

Subtask 57-20-00-010-121-A

B. Get Access
(1) Put the ACCESS PLATFORM 3M (10 FT) in position at zone 540(640).
(2) Remove fuel pumps 21QA(26QA) and 25QA(22QA) (Ref. AMM TASK 28-21-51-000-001).

Subtask 57-20-00-110-106-A

C. Preparation of the Inspection Area
(1) Make sure that the inspection area is sufficiently clean to do a satisfactory inspection of the area.

WARNING: WHEN YOU USE COMPRESSED AIR:

USE THE CORRECT PROTECTION (FACE SHIELD OR GOGGLES)
DO NOT POINT THE AIRFLOW AT YOURSELF OR OTHER PERSONS.

LOOSE PARTICLES AND/OR HIGH PRESSURE AIR CAN CAUSE INJURY.

(2) If not, clean the edges of the two fuel pump openings with the clean Textile-Lint free Cotton - (Material No.14SBA1) made moist with Non Aqueous Cleaner-General - - (Material No.08BAA9) and the AIR SOURCE FILTERED, DRY.
(3) Make sure that there is no TPS layer and if there is a TPS layer, remove it (Ref. AMM TASK 51-78-00-916-001).
(4) Remove the sealant and/or paint from the inspection area if this is necessary for the Nondestructive Testing Manual (NTM) task.

4. Procedure
Subtask 57-20-00-280-062-A

A. Inspection
(1) Do a special detailed inspection (HFEC and US) of the bottom skin lower-surface of the outer wing for damage or discontinuities. Do this inspection at the fuel pump openings and the adjacent holes, between rib 1 and rib 2 NTM 572054.
(2) Make a report of the damage after the NTM inspection:
(a) Corrosion damage:
If you find corrosion, refer to the Structural Repair Manual ( SRM 512200) for the corrosion types, inspection, removal and subsequent corrosion protection.
(b) Other damage (scratches, cracks, gouges, dents, creases):
If you find this type of damage, refer to the Structural Repair Manual ( SRM 511100) for damage types, classification and corrective action.

Subtask 57-20-00-370-050-A

B. Sealant or Paint Application
(1) If the NTM procedure asked to remove the sealant and/or paint from the inspection area, apply sealant ( SRM 512400) or paint ( SRM 512300) on the inspection area.

5. Close-up
Subtask 57-20-00-410-117-A

A. Close Access
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Install fuel pumps 21QA(26QA) and 25QA(22QA) (Ref. AMM TASK 28-21-51-400-001).

Subtask 57-20-00-942-118-A

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

[Rev.10 from 2021] 2026.04.02 06:30:38 UTC