Special Detailed Inspection of Stringer Coupling from Stringer 10 LH/RH to Crown Center Line, FWD and Aft FR 47, Internal Surface

TASK 53-31-00-220-809-A
Special Detailed Inspection of Stringer Coupling from Stringer 10 LH/RH to Crown Center Line, FWD and Aft FR 47, Internal Surface

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

ZONE: 240

1. Reason for the Job
Refer to the MPD TASK: 533191-01
SPECIAL DETAILED INSPECTION (HFEC AND US) OF STRINGER COUPLING FROM STRINGER 10 LH/RH TO CROWN CENTER LINE, FWD AND AFT FR 47, INTERNAL SURFACE.

NOTE: This task is an alternative to MPD task 533191-02.

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

REFERENCE	QTY	DESIGNATION
No specific	1	FLASHLIGHT
No specific	1	SCRAPER - NON METALLIC

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
240	MID PASSENGER COMPARTMENT

D. Referenced Information

REFERENCE	DESIGNATION
TASK 24-42-00-861-001-A	Energize the Ground Service Network from the External Power
TASK 24-42-00-862-001-A	De-energize the Ground Service Network Supplied from the External Power
TASK 25-23-43-000-001-A	Removal of the Upper Sidewall Panel
TASK 25-23-43-400-001-A	Installation of the Upper Sidewall Panel
TASK 25-24-41-000-001-A	Removal of the Overhead Stowage Compartments (OHSC)
TASK 25-24-41-400-001-A	Installation of the Overhead Stowage Compartments (OHSC)
TASK 25-80-00-000-001-A	Removal of the Insulation Blankets
TASK 25-80-00-400-001-A	Installation of the Insulation Blankets
TASK 51-78-00-916-001-A	Application of Temporary Protection System (TPS)
SRM 511100
SRM 512200
SRM 512300
SRM 512400
NTM 533191
Internal Surface of the Stringer Coupling at Forward and Aft Frame 47, from Left and Right Stringers 10 to the Crown Centerline

3. Job Set-up
Subtask 53-31-00-861-083-A

A. Aircraft Maintenance Configuration
(1) Energize the ground service network
(Ref. AMM TASK 24-42-00-861-001).

Subtask 53-31-00-010-135-A

B. Get Access
(1) Remove the Overhead Stowage Compartments (OHSC) (Ref. AMM TASK 25-24-41-000-001).
(2) Remove the upper sidewall panels (Ref. AMM TASK 25-23-43-000-001).
(3) Remove the insulation blankets (Ref. AMM TASK 25-80-00-000-001).

Subtask 53-31-00-110-135-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.
(2) If the inspection area is not sufficiently clean, clean it with the Non Aqueous Cleaner-General - - (Material No.08BAA9) and the Textile-Lint free Cotton - (Material No.14SBA1) .
(3) If there is a TPS layer and if it does not let you do a satisfactory inspection, remove the TPS layer (Ref. AMM TASK 51-78-00-916-001).
(4) If sealant or paint is applied on the inspection area:
(a) Remove the sealant with the SCRAPER - NON METALLIC.
(b) Remove the paint.

4. Procedure
Subtask 53-31-00-220-074-A

A. Inspection
(1) If necessary, use the FLASHLIGHT to do the inspection.
(2) Do a special detailed inspection of the internal surface of the stringer coupling for damage or discontinuities NTM 533191. Do this inspection at forward and aft frame 47, from left and right stringers 10 to the crown centerline.

NOTE: The stringer coupling lengths are different. Thus the number of stringer coupling rivets can increase or decrease. It is necessary to inspect the stringer coupling surface around all the rivet heads.

(3) Refer to the NTM inspection report and do the applicable step:
(a) Corrosion:
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.

Subtask 53-31-00-914-052-A

B. Sealant or Paint Application
(1) If you removed the sealant and/or paint from the inspection area, apply sealant SRM 512400 or paint SRM 512300 on the inspection area.

Subtask 53-31-00-916-088-A

CAUTION: DO NOT APPLY TEMPORARY PROTECTION SYSTEM (TPS) TYPE 3 ON THE MOVABLE COMPONENTS. USE ONLY TPS TYPE 1 GRADE 2. IF YOU DO NOT OBEY THIS INSTRUCTION, THE MECHANISMS WILL NOT OPERATE CORRECTLY.

C. Check and Application of the TPS Layer

NOTE: There is no special requirement about the TPS layer application in this area. The operator can apply TPS or let the surface stay without protection.

(1) If you removed the TPS layer at the ”Preparation of the Inspection Area” paragraph, apply a new TPS layer (Ref. AMM TASK 51-78-00-916-001).
(2) If you did not remove the TPS layer at the ”Preparation of the Inspection Area” paragraph:
(a) Do a check of the condition and integrity of the TPS layer (Ref. AMM TASK 51-78-00-916-001).
(b) In relation to the condition and integrity of the TPS layer, apply a new TPS layer or not.
(3) If the TPS layer has local damage, remove the damaged TPS layer and apply a new TPS layer (Ref. AMM TASK 51-78-00-916-001).

5. Close-up
Subtask 53-31-00-370-069-A

DELETED

Subtask 53-31-00-410-132-A

B. Close Access
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Install the insulation blankets (Ref. AMM TASK 25-80-00-400-001).
(3) Install the upper sidewall panels (Ref. AMM TASK 25-23-43-400-001).
(4) Install the OHSCs (Ref. AMM TASK 25-24-41-400-001).
(5) Remove the ground support and maintenance equipment, the special and standard tools and all other items.

Subtask 53-31-00-862-072-A

C. Aircraft Maintenance Configuration
(1) De-energize the ground service network
(Ref. AMM TASK 24-42-00-862-001).

[Rev.10 from 2021] 2026.04.02 06:29:07 UTC