Special Detailed Inspection (US) of Center Wing Box, Triform Fitting and Stiffener between Stiffener 6 and FR 42, LH/RH

TASK 57-10-00-270-803-A
Special Detailed Inspection (US) of Center Wing Box, Triform Fitting and Stiffener between Stiffener 6 and FR 42, LH/RH

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: 140

1. Reason for the Job
Refer to ALI TASK: 571202-02
SPECIAL DETAILED INSPECTION (US) OF CENTER WING BOX, TRIFORM FITTING AND STIFFENER BETWEEN STIFFENER 6 AND FR 42, LH/RH.

NOTE: The effectivity of this task is "ALL". To know if this task is applicable to your aircraft, refer to the MPD task applicability.
The information on weight variant groups is given in the MPD and SRM introductions.

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

REFERENCE	QTY	DESIGNATION
No specific	AR	ACCESS PLATFORM 2M (6 FT)
No specific	AR	FLASHLIGHT
No specific	AR	MIRROR - INSPECTION

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
140	CENTER WING
734, 744

D. Referenced Information

REFERENCE	DESIGNATION
TASK 32-12-00-010-001-A	Open the Main Gear Doors for Access
TASK 32-12-00-410-001-A	Close the Main Gear Doors after Access
TASK 57-17-11-000-001-A	Removal of Access Cover 147AZ(148AZ)
TASK 57-17-11-000-001-B	Removal of Access Cover 148AZ or/and the ACT-Equipment Support Door
TASK 57-17-11-400-001-A	Installation of Access Cover 147AZ(148AZ)
TASK 57-17-11-400-001-B	Installation of Access Cover 148AZ or/and the ACT-Equipment Support-Door
SRM 512300
SRM 512400
NTM 571202
SRM 511100	(for corrective action)
SRM 512200	(for corrective action)
Triform Fitting and Stiffener of the Center Wing Box, between Stiffener 6 and FR42 ** ON A/C NOT FOR ALL
Triform Fitting and Stiffener of the Center Wing Box, between Stiffener 6 and FR42 ** ON A/C NOT FOR ALL

3. Job Set-up
Subtask 57-10-00-010-099-A

A. Get Access
(1) Open the Main Landing Gear (MLG) door 734 ( 744) (Ref. AMM TASK 32-12-00-010-001).
(2) Put an ACCESS PLATFORM 2M (6 FT) in position in zone 147 (148).
(3) Remove the necessary access covers or/and ACT-equipment support door to get access to the inspection areas (Ref. AMM TASK 57-17-11-000-001).

Subtask 57-10-00-110-087-A

B. Preparation of the Inspection Area
(1) Remove the sealant and/or paint from the inspection area if this is necessary for the Non-destructive Testing Manual (NTM) task.
(2) Make sure that the inspection area is sufficiently clean to do a satisfactory inspection of the area.
(3) If it is not sufficiently clean, clean the inspection area with Non Aqueous Cleaner-General - - (Material No.08BAA9) and Textile-Lint free Cotton - (Material No.14SBA1) .
(4) Use a FLASHLIGHT and a MIRROR - INSPECTION for the inspection, if necessary.

4. Procedure
Subtask 57-10-00-270-060-A

A. Inspection

Triform Fitting and Stiffener of the Center Wing Box, between Stiffener 6 and FR42 ** ON A/C NOT FOR ALL

(1) Do a special detailed inspection (US) of the triform fitting and the stringer of the center wing box for damage or discontinuities. This inspection includes the area between stiffener 6 and FR42. Do this inspection on the left and right sides on the bottom center tank from inside the aircraft. Refer to the Non-destructive Testing Manual ( NTM 571202).
(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 the damage types, classification and corrective action.

5. Close-up
Subtask 57-10-00-390-057-A

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

Subtask 57-10-00-410-100-A

B. Close Access
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Install the access covers or/and ACT-equipment support door (Ref. AMM TASK 57-17-11-400-001).
(3) Remove the access platform(s).
(4) Close the Main Landing Gear (MLG) door 734 ( 744) (Ref. AMM TASK 32-12-00-410-001).

[Rev.10 from 2021] 2026.04.02 06:30:32 UTC