Detailed Inspection of Longitudinal Beam Flange at Stringer 20A LH and Stringer 20A RH

TASK 53-31-00-220-817-A
Detailed Inspection of Longitudinal Beam Flange at Stringer 20A LH and Stringer 20A RH

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

ZONE: 241
ZONE: 242

1. Reason for the Job
Refer to the MPD TASK: 533139-02
DETAILED INSPECTION OF LONGITUDINAL BEAM FLANGE AT STRINGER 20A LH AND STRINGER 20A RH, BETWEEN FR 38 AND FR 39 AND BETWEEN FR 40 AND FR 41.

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

2. Job Set-up Information
A. Consumable Materials

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

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
241	CENTER PASSENGER COMPARTMENT
242	CENTER PASSENGER COMPARTMENT

C. 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 25-23-44-000-001-A	Removal of the Lower Sidewall Panels (Dado Panels)
TASK 25-23-44-400-001-A	Installation of the Lower Sidewall Panels (Dado Panels)
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 52-21-11-000-001-A	Removal of the Emergency Exit Hatch
TASK 52-21-11-400-001-A	Installation of the Emergency Exit Hatch
SRM 511100
SRM 512200
Longitudinal Beam Flange at Stringer 20A LH and Stringer 20A RH, between FR38 and FR39 and between FR40 and FR41

3. Job Set-up
Subtask 53-31-00-861-074-A

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

Subtask 53-31-00-010-153-A

B. Get Access
(1) Remove the emergency exit hatches (Ref. AMM TASK 52-21-11-000-001) and/or (Ref. AMM D/O 52-21-11-00).
(2) Remove the applicable lower side-wall panel (Ref. AMM TASK 25-23-44-000-001).
(3) Remove the applicable insulation blankets from the inspection area (Ref. AMM TASK 25-80-00-000-001).

Subtask 53-31-00-110-156-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 not, clean the inspection area with Non Aqueous Cleaner-General - - (Material No.08BAA9) and the Textile-Lint free Cotton - (Material No.14SBA1) .

4. Procedure
Subtask 53-31-00-210-119-B

A. Inspection
(1) Do a detailed inspection of the longitudinal beam flanges at left and right stringers 20A for damage or discontinuities. Do this inspection between FR38 and FR39 and between FR40 and FR41.
(2) Make sure that there is no:
(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 53-31-00-410-150-A

A. Close Access
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Install the removed insulation blankets (Ref. AMM TASK 25-80-00-400-001).
(3) Install the applicable lower side-wall panel (Ref. AMM TASK 25-23-44-400-001).
(4) Install the removed emergency exit hatches (Ref. AMM TASK 52-21-11-400-001) and/or (Ref. AMM D/O 52-21-11-40).

Subtask 53-31-00-862-070-A

B. De-energize the ground service network (Ref. AMM TASK 24-42-00-862-001).

[Rev.10 from 2021] 2026.04.02 06:29:04 UTC