Detailed Inspection of Frame Flanges and Longitudinal Beam Flange

TASK 53-31-00-210-028-A
Detailed Inspection of Frame Flanges and Longitudinal Beam Flange

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
Self explanatory
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
241FW, 242FW
241CW, 241LW, 242CW, 242LW

C. Referenced Information

REFERENCE	DESIGNATION
TASK 21-20-00-010-001-A	Removal of the Air-Conditioning Distribution Ducts
TASK 21-20-00-410-001-A	Installation of the Air-Conditioning Distribution Ducts
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 25-23-47-000-002-A	Removal of the Upper Sidewall Panel Assy 241LW, (242LW), 241CW, (242CW) and 241FW, (242FW)
TASK 25-23-47-400-002-A	Installation of the Upper Sidewall Panel Assy 241LW, (242LW), 241CW, (242CW) and 241FW, (242FW)
TASK 25-23-48-000-001-A	Removal of the Cove Light Panel
TASK 25-23-48-400-001-A	Installation of the Cove Light Panel
TASK 25-80-00-000-001-A	Removal of the Insulation Blankets
TASK 25-80-00-400-001-A	Installation of the Insulation Blankets
SRM 53001202	(for corrective action)
Frame Flanges at FR38 thru FR41, between STGR12 and STGR21, and Longitudinal Beam Flange at STGR20A, between FR38 and FR39, and between FR40 and FR41, LH/RH ** ON A/C NOT FOR ALL
Frame Flanges at FR40 and FR41, between STGR12 and STGR21, and Longitudinal Beam Flange at STGR20A, between FR40 and FR41, LH/RH ** ON A/C NOT FOR ALL

3. Job Set-up
Subtask 53-31-00-861-057-A ** ON A/C NOT FOR ALL

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

Subtask 53-31-00-010-086-A ** ON A/C NOT FOR ALL

B. Get Access
(1) Remove the upper sidewall panel assembly 241CW 241LW 242CW 242LW (Ref. AMM TASK 25-23-47-000-002).
(2) Remove the cove light panels above the emergency exits (Ref. AMM TASK 25-23-48-000-001).
(3) Remove the riser duct and the cabin-air outlet assembly from both sides of the cabin, between FR37 and FR41 (Ref. AMM TASK 21-20-00-010-001).
(4) Remove the necessary insulation blankets from the inspection area (Ref. AMM TASK 25-80-00-000-001).

Subtask 53-31-00-010-086-B ** ON A/C NOT FOR ALL

B. Get Access
(1) Remove the upper sidewall panel assembly 241FW 242FW (Ref. AMM TASK 25-23-47-000-002).
(2) Remove the cove light panels above the emergency exits (Ref. AMM TASK 25-23-48-000-001).
(3) Remove the riser duct and the cabin-air outlet assembly from both sides of the cabin, between FR40 and FR41 (Ref. AMM TASK 21-20-00-010-001).
(4) Remove the necessary insulation blankets from the inspection area (Ref. AMM TASK 25-80-00-000-001).

Subtask 53-31-00-110-078-A ** ON A/C NOT FOR ALL

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) .
(3) Make sure that the area is dry before you continue.

4. Procedure
Subtask 53-31-00-210-076-A ** ON A/C NOT FOR ALL

A. Detailed Inspection

Frame Flanges at FR38 thru FR41, between STGR12 and STGR21, and Longitudinal Beam Flange at STGR20A, between FR38 and FR39, and between FR40 and FR41, LH/RH ** ON A/C NOT FOR ALL

(1) Do a detailed inspection of the frame flanges between stringer 12 and stringer 21 and the longitudinal beam flange at stringer 20A. Do this between FR38 and FR39, and between FR40 and FR41, LH and RH. Look for cracks.
(2) For information on repair procedures for cracks, refer to the ASRM SRM 53001202.

Subtask 53-31-00-210-076-C ** ON A/C NOT FOR ALL

A. Detailed Inspection

Frame Flanges at FR40 and FR41, between STGR12 and STGR21, and Longitudinal Beam Flange at STGR20A, between FR40 and FR41, LH/RH ** ON A/C NOT FOR ALL

(1) Do a detailed inspection of the frame flanges between stringer 12 and stringer 21 and the longitudinal beam flange at stringer 20A. Do this between FR40 and FR41, LH and RH. Look for cracks.
(2) For information on repair procedures for cracks, refer to the ASRM SRM 53001202.

5. Close-up
Subtask 53-31-00-410-084-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 insulation blankets (Ref. AMM TASK 25-80-00-400-001).
(3) Install the riser duct and cabin-air outlet assembly (Ref. AMM TASK 21-20-00-410-001).
(4) Install the cove light panels (Ref. AMM TASK 25-23-48-400-001).
(5) Install the upper sidewall panel assembly 241CW 241LW 242CW 242LW (Ref. AMM TASK 25-23-47-400-002).
(6) Remove the ground support and maintenance equipment, the special and standard tools and all other items.

Subtask 53-31-00-410-084-B ** 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 insulation blankets (Ref. AMM TASK 25-80-00-400-001).
(3) Install the riser duct and cabin-air outlet assembly (Ref. AMM TASK 21-20-00-410-001).
(4) Install the cove light panels (Ref. AMM TASK 25-23-48-400-001).
(5) Install the upper sidewall panel assembly 241FW 242FW (Ref. AMM TASK 25-23-47-400-002).
(6) Remove the ground support and maintenance equipment, the special and standard tools and all other items.

Subtask 53-31-00-862-057-A ** ON A/C NOT FOR ALL

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

[Rev.10 from 2021] 2026.04.02 06:29:05 UTC