Detailed Inspection of Keelbeam Box

TASK 53-31-00-210-007-A
Detailed Inspection of Keelbeam Box

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

ZONE: 147
ZONE: 148
ZONE: 191
ZONE: 192
ZONE: 195
ZONE: 196

1. Reason for the Job
Refer to the MPD TASK: 533151-01
DETAILED INSPECTION OF KEELBEAM BOX

NOTE: The effectivity of this task is ALL. To know, if this task is applicable for your aircraft, refer to the MPD task applicability and the weight variant data given in the SRM introduction.

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.05RDA1)	Adhesive Film Tape-Masking - -
(Material No.08BAA9)	Non Aqueous Cleaner-General - -
(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
191	AIR CONDITIONING COMPT AND FAIRINGS
192	AIR CONDITIONING COMPT AND FAIRINGS
195	HYDRAULIC COMPT AND FAIRINGS
196	HYDRAULIC COMPT AND FAIRINGS

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
TASK 51-78-00-916-001-A	Application of Temporary Protection System (TPS)
TASK 53-35-11-000-001-A	Removal of the Wing-to-Fuselage Fairings
TASK 53-35-11-400-001-A	Installation of the Wing-to-Fuselage Fairings
TASK 53-35-13-000-001-A	Removal of the Belly Fairing Access Panels
TASK 53-35-13-000-002-A	Removal of the Quick-Release Access Panels from the Belly Fairing Structure
TASK 53-35-13-400-001-A	Installation of the Belly Fairing Access Panels
TASK 53-35-13-400-002-A	Installation of the Quick-Release Access Panels on the Belly Fairing Structure
SRM 511100
SRM 512200
Keelbeam Box

3. Job Set-up
Subtask 53-31-00-869-052-A

A. 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 53-31-00-865-058-A

B. 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 53-31-00-010-056-A ** ON A/C NOT FOR ALL

C. 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 at the area to be inspected.
(5) Remove the access panels 147AB, 147BB, 147EB, 147FB, 148DB, 148FB, 191GB, 191HB, 191JB, 191KB, 192KB, 195AB and 196AB (Ref. AMM TASK 53-35-11-000-001), (Ref. AMM TASK 53-35-13-000-001), (Ref. AMM TASK 53-35-13-000-002).

Subtask 53-31-00-010-056-B ** ON A/C NOT FOR ALL

C. 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 at the area to be inspected.
(5) Remove the access panels 147AB, 147BB, 147EB, 147FB, 148DB, 148FB, 191BB, 191GB, 191HB, 191JB, 191KB, 192KB, 195AB and 196AB (Ref. AMM TASK 53-35-11-000-001), (Ref. AMM TASK 53-35-13-000-001), (Ref. AMM TASK 53-35-13-000-002).

Subtask 53-31-00-110-107-A

D. 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 a Textile-Lint free Cotton - (Material No.14SBA1) .
(3) Remove the TPS layer, if it does not let you to do a satisfactory inspection (Ref. AMM TASK 51-78-00-916-001).

4. Procedure
Subtask 53-31-00-210-056-A

A. Inspection
(1) Do a detailed inspection of the keelbeam box for damage or discontinuities:
(a) For A320, between FR35 and FR47
(b) For A321, between FR35.8 and FR47
(c) For A319, between FR35 and FR47/51
(d) For A318, between FR35 and FR47/54.
(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.

Subtask 53-31-00-916-055-A

B. Application of Temporary Protection System

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

CAUTION: DO NOT APPLY TEMPORARY PROTECTION ON THE OXYGEN SYSTEMS. MAKE SURE THAT THE TEMPORARY PROTECTION DOES NOT GET:

ON COMPOSITE PARTS, CONTROL CABLES, PULLEYS,TEFLON BEARINGS.
ON LUBRICATED SURFACES.
IN DRAIN VALVES OR OTHER ORIFICES.

TEMPORARY PROTECTION ON OR IN THESE PARTS CAN CAUSE DAMAGE.

(1) Apply masking paper or tape Adhesives Adhesive Film Tape-Masking - - (Material No.05RDA1) on the equipment and fittings adjacent to the area.
(2) If there is a TPS layer, do a check of the condition and integrity of the TPS layer (Ref. AMM TASK 51-78-00-916-001).

NOTE: Airbus recommends that you always apply a new layer of TPS. This is to make sure that the TPS layer continues to give satisfactory corrosion protection. Make sure that the TPS layer is in the correct condition after the check. If the TPS is in the correct condition, apply a new layer as a spray on the remaining layer.

(3) Replace the damaged TPS layer with a new layer on the inspection area, as recommended in the MPD (Ref. AMM TASK 51-78-00-916-001).
(4) If you used solvents, high pressure water, steam and/or cleaning agents to clean the TPS layer:
(a) Apply a full new layer of TPS on the inspection area, as recommended in the MPD (Ref. AMM TASK 51-78-00-916-001).
(b) If there is no TPS layer, apply a new layer of TPS on the inspection area, as recommended in the MPD (Ref. AMM TASK 51-78-00-916-001).
(5) Remove the masking paper or the masking tape.

5. Close-up
Subtask 53-31-00-865-059-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 53-31-00-410-056-A ** ON A/C NOT FOR ALL

B. Close Access
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Install the access panels 147AB, 147BB, 147EB, 147FB, 148DB, 148FB, 191GB, 191HB, 191JB, 191KB, 192KB, 195AB and 196AB (Ref. AMM TASK 53-35-11-400-001), (Ref. AMM TASK 53-35-13-400-001), (Ref. AMM TASK 53-35-13-400-002).
(3) Close the MLG doors (Ref. AMM TASK 32-12-00-410-001).
(4) Remove the WARNING NOTICE(S).
(5) Remove the access platform(s).
(6) Remove the ground support and maintenance equipment, the special and standard tools and all other items.

Subtask 53-31-00-410-056-B ** ON A/C NOT FOR ALL

B. Close Access
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Install the access panels 147AB, 147BB, 147EB, 147FB, 148DB, 148FB, 191BB, 191GB, 191HB, 191JB, 191KB, 192KB, 195AB and 196AB (Ref. AMM TASK 53-35-11-400-001), (Ref. AMM TASK 53-35-13-400-001), (Ref. AMM TASK 53-35-13-400-002).
(3) Close the MLG doors (Ref. AMM TASK 32-12-00-410-001).
(4) Remove the WARNING NOTICE(S).
(5) Remove the access platform(s).
(6) 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