Detailed Inspection of Lower Surface of Pressure Deck Membranes, between FR 42 and FR 46, Including Connections to Longitudinal Beams, Side Boxes, ...

TASK 53-31-00-210-006-A
Detailed Inspection of Lower Surface of Pressure Deck Membranes, between FR 42 and FR 46, Including Connections to Longitudinal Beams, Side Boxes, ...

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

ZONE: 147
ZONE: 148

1. Reason for the Job
Refer to the MPD TASK: 533111-01
DETAILED INSPECTION OF LOWER SURFACE OF PRESSURE DECK MEMBRANES, BETWEEN FR 42 AND FR 46, INCLUDING CONNECTIONS TO LONGITUDINAL BEAMS, SIDE BOXES, SUPPORT RIBS, REAR SPAR OF CENTER WING BOX AND PRESSURE BULKHEAD, LH/RH
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	1	ACCESS PLATFORM 3M (10 FT)- ADJUSTABLE
No specific	AR	SAFETY CLIP - CIRCUIT BREAKER
No specific	1	WARNING NOTICE(S)

B. Consumable Materials

REFERENCE	DESIGNATION
(Material No.08BBB1)	Non Aqueous Cleaner-- Petroleum Based -
(Material No.14SBA1)	Textile-Lint free Cotton -

C. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
147	MAIN GEAR WELL AND HYDRAULIC COMPARTMENT
148	MAIN GEAR WELL AND HYDRAULIC COMPARTMENT

D. Referenced Information

REFERENCE	DESIGNATION
TASK 24-41-00-862-002-A	De-energize the Aircraft Electrical Circuits Supplied from the External Power
TASK 24-41-00-862-002-A-01	De-energize the Aircraft Electrical Circuits Supplied from the APU
TASK 24-41-00-862-002-A-02	De-energize the Aircraft Electrical Circuits Supplied from the Engine 1(2)
TASK 29-10-00-864-001-A	Depressurize the Green Hydraulic System
TASK 29-10-00-864-002-A	Depressurize the Yellow Hydraulic System
TASK 29-10-00-864-003-A	Depressurize the Blue Hydraulic System
TASK 32-00-00-860-001-A	Flight Configuration Precautions with Electrical Power
TASK 32-00-00-860-001-A-01	Flight Configuration Precautions without Electrical Power
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
SRM 53311400	(for corrective action)
SRM 53311600	(for corrective action)
Lower Surface of the Pressure Deck Membranes

3. Job Set-up
Subtask 53-31-00-010-055-A

A. Get Access
(1) Open the MLG doors (Ref. AMM TASK 32-12-00-010-001).
(2) Depressurize the Green, Blue and Yellow hydraulic systems (Ref. AMM TASK 29-10-00-864-001), (Ref. AMM TASK 29-10-00-864-002), (Ref. AMM TASK 29-10-00-864-003).
(3) Put the WARNING NOTICE(S) in position to tell persons not to operate the landing gear.
(4) Put the ACCESS PLATFORM 3M (10 FT)- ADJUSTABLE in position.

Subtask 53-31-00-869-054-A

B. Flight Configuration Precautions
(1) If the electrical power is not necessary for other maintenance tasks, de-energize the aircraft electrical circuits (Ref. AMM TASK 24-41-00-862-002). Then, it is not necessary to operate the LGCIU circuit breakers.
(2) If the electrical power is necessary, do the precautions for flight configuration (Ref. AMM TASK 32-00-00-860-001) before you open the LGCIU circuit breakers.

Subtask 53-31-00-865-056-A

C. Open, safety and tag this(these) circuit breaker(s):

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C ALL
49VU	L/G/LGCIU/SYS1/NORM	1GA	C09
121VU	HYDRAULIC/LGCIU/SYS2	2GA	Q35
121VU	HYDRAULIC/LGCIU/SYS1/GRND SPLY	52GA	Q34

Subtask 53-31-00-110-106-A

D. Preparation of the Inspection Area
(1) Carefully clean the lower surface of the pressure deck with Non Aqueous Cleaner-- Petroleum Based - (Material No.08BBB1) and a clean lint-free cloth Textile-Lint free Cotton - (Material No.14SBA1) .

4. Procedure
Subtask 53-31-00-210-055-A

A. Inspection
(1) Examine the lower surface of the pressure deck membranes between FR42 thru FR46 with the connections to the longitudinal beams, side boxes, support ribs, rear spar of the wing box and the pressure bulkhead, LH/RH for:

cracks,
corrosion,

NOTE: If necessary, refer to the ASRM SRM 53311400 and SRM 53311600 for the correct repair procedures.

5. Close-up
Subtask 53-31-00-865-057-A

A. Remove the safety clip(s) and the tag(s) and close this(these) circuit breaker(s):

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C ALL
49VU	L/G/LGCIU/SYS1/NORM	1GA	C09
121VU	HYDRAULIC/LGCIU/SYS2	2GA	Q35
121VU	HYDRAULIC/LGCIU/SYS1/GRND SPLY	52GA	Q34

Subtask 53-31-00-410-055-A

B. Close Access
(1) Close the MLG doors (Ref. AMM TASK 32-12-00-410-001).
(2) Remove the WARNING NOTICE(S).
(3) Remove the access platform(s).
(4) Remove the ground support and maintenance equipment, the special and standard tools and all other items.

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