DOC AIRBUS | AMM A320FInstallation of the Magnetic Level-Indicator Assembly
TASK 28-43-22-400-004-A
Installation of the Magnetic Level-Indicator Assembly
Self Explanatory
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment
B. Consumable Materials
C. Work Zones and Access Panels
D. Expendable Parts
E. Referenced Information
3. Job Set-up
Subtask 28-43-22-941-057-A ** ON A/C NOT FOR ALL
Subtask 28-43-22-420-057-B ** ON A/C NOT FOR ALL
Subtask 28-43-22-942-053-A ** ON A/C NOT FOR ALL
[Rev.10 from 2021]
2026.04.02 06:18:14 UTC
Installation of the Magnetic Level-Indicator Assembly
WARNING:
THIS PROCEDURE USES A FUEL SYSTEM ITEM THAT IS IN A CATEGORY KNOWN AS A CRITICAL DESIGN CONFIGURATION CONTROL LIMITATION (CDCCL). CDCCL IDENTIFIES AN ITEM THAT CAN BE THE SOURCE OF A POSSIBLE FUEL TANK IGNITION. YOU MUST KEEP ALL CDCCL ITEMS IN THE APPROVED CONFIGURATION. DAMAGE, WEAR OR CHANGES TO A CDCCL ITEM CAN CAUSE A POSSIBLE FUEL TANK EXPLOSION.
WARNING:
BE CAREFUL WHEN YOU USE CONSUMABLE MATERIALS. OBEY THE MATERIAL MANUFACTURER'S INSTRUCTIONS AND YOUR LOCAL REGULATIONS.
WARNING:
MAKE SURE THAT THE GROUND SAFETY-LOCKS ARE IN POSITION ON THE LANDING GEAR. THIS WILL PREVENT UNWANTED MOVEMENT OF THE LANDING GEAR, AND THUS POSSIBLE INJURY TO PERSONS AND DAMAGE TO THE AIRCRAFT AND/OR EQUIPMENT.
WARNING:
MAKE SURE THAT THE FLIGHT CONTROL SAFETY-LOCKS AND THE WARNING NOTICES ARE IN POSITION.
1. Reason for the JobSelf Explanatory
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 | 1 | CONTAINER - CLEAN, APPLICABLE |
| No specific | 1 | SAFETY BARRIER(S) |
| REFERENCE | DESIGNATION |
|---|---|
| (Material No.01ABA1) | Turbine Fuel-- Kerosene - |
| (Material No.03FAB1) | Mineral Oil base Grease-- Vaseline or Petrolatum - |
| (Material No.06ABA1) | Polysulfide Sealant-Fuel Tank Brushable - |
| (Material No.08BAA9) | Non Aqueous Cleaner-General - - |
| (Material No.14SBA1) | Textile-Lint free Cotton - |
| ZONE/ACCESS | ZONE DESCRIPTION |
|---|---|
| FOR [202QM] (HOUSING-MLI NO 7 LEFT) | |
| 540QB | |
| FOR [203QM] (HOUSING-MLI NO 7 RIGHT) | |
| 640QB | |
| FIG.ITEM | DESIGNATION | IPC-CSN |
|---|---|---|
| FOR [202QM] (HOUSING-MLI NO 7 LEFT) | ||
| 4 | O-RING | AIPC 28-43-05-21-150 |
| 5 | O-RING | AIPC 28-43-05-21-160 |
| FOR [203QM] (HOUSING-MLI NO 7 RIGHT) | ||
| 4 | O-RING | AIPC 28-43-05-24-150 |
| 5 | O-RING | AIPC 28-43-05-24-160 |
| REFERENCE | DESIGNATION |
|---|---|
| TASK 12-11-28-650-003-A | Pressure Refuel with Automatic Control |
| TASK 20-28-00-912-802-A | Electrical Bonding - General Maintenance Procedure |
| TASK 28-10-00-910-001-A | Safety Procedures When You Do Work in a Fuel Tank |
| TASK 28-10-00-910-002-A | Access to the Fuel Tanks and the Work Areas |
| TASK 28-25-00-650-001-A | Pressure Defuel |
| TASK 28-25-00-650-003-A | To Drain Remaining Fuel from the Wing Tanks and the Center Tank |
| TASK 28-25-00-650-003-A-01 | To Drain Remaining Fuel from the Wing Tanks and the Center Tank |
| TASK 28-25-00-869-001-A | Fuel Transfer |
| TASK 57-27-11-000-002-A | Removal of the Access Panel |
| TASK 57-27-11-400-002-A | Installation of the Access Panel |
Magnetic-Level-Indicator AssemblySubtask 28-43-22-941-057-A ** ON A/C NOT FOR ALL
A. Safety Precautions
(2) Make sure that the SAFETY BARRIER(S) is in position.
Subtask 28-43-22-860-053-A ** ON A/C NOT FOR ALL WARNING:
BEFORE YOU DO WORK IN OR NEAR A FUEL TANK, MAKE SURE THAT YOU OBEY ALL THE SAFETY PROCEDURES. THIS WILL PREVENT INJURY TO PERSONS AND/OR DAMAGE TO THE AIRCRAFT.
(1) You must obey the fuel safety procedures when you do work in a fuel tank (Ref. AMM TASK 28-10-00-910-001). (2) Make sure that the SAFETY BARRIER(S) is in position.
B. Aircraft Maintenance Configuration
(1) Make sure that the applicable fuel tank is defueled (Ref. AMM TASK 28-25-00-650-001).
(2) Make sure that the remaining fuel has been drained from the applicable fuel tank (Ref. AMM TASK 28-25-00-650-003).
(3) Make sure that the ACCESS PLATFORM 3M (10 FT)- ADJUSTABLE is below the applicable access panel 540QB (640QB). removal task.
(4) Make sure that the applicable access panel 540QB (640QB) is removed (Ref. AMM TASK 57-27-11-000-002) and (Ref. AMM TASK 28-10-00-910-002).
4. Procedure(1) Make sure that the applicable fuel tank is defueled (Ref. AMM TASK 28-25-00-650-001).
(2) Make sure that the remaining fuel has been drained from the applicable fuel tank (Ref. AMM TASK 28-25-00-650-003).
(3) Make sure that the ACCESS PLATFORM 3M (10 FT)- ADJUSTABLE is below the applicable access panel 540QB (640QB). removal task.
(4) Make sure that the applicable access panel 540QB (640QB) is removed (Ref. AMM TASK 57-27-11-000-002) and (Ref. AMM TASK 28-10-00-910-002).
Subtask 28-43-22-420-057-B ** ON A/C NOT FOR ALL
A. Preparation for Installation
(1) Clean the component interface and/or the adjacent area with Textile-Lint free Cotton - (Material No.14SBA1) made moist with Non Aqueous Cleaner-General - - (Material No.08BAA9) .
(2) Do an inspection of the component interfaces and the adjacent area.
(3) Make sure that the parts retained from the removed component are clean and in the correct condition.
(4) Apply Turbine Fuel-- Kerosene - (Material No.01ABA1) or Mineral Oil base Grease-- Vaseline or Petrolatum - (Material No.03FAB1) to:
(a) FOR [202QM] (HOUSING-MLI NO 7 LEFT)
the new AIPC 28-43-05-21-150 O-RING (4) and new AIPC 28-43-05-21-160 O-RING (5)
(b) FOR [203QM] (HOUSING-MLI NO 7 RIGHT)
the new AIPC 28-43-05-24-150 O-RING (4) and the AIPC 28-43-05-24-160 O-RING (5).
(5) Install the O-ring (5) on to the base (2).
Subtask 28-43-22-420-055-A ** ON A/C NOT FOR ALL (1) Clean the component interface and/or the adjacent area with Textile-Lint free Cotton - (Material No.14SBA1) made moist with Non Aqueous Cleaner-General - - (Material No.08BAA9) .
(2) Do an inspection of the component interfaces and the adjacent area.
(3) Make sure that the parts retained from the removed component are clean and in the correct condition.
(4) Apply Turbine Fuel-- Kerosene - (Material No.01ABA1) or Mineral Oil base Grease-- Vaseline or Petrolatum - (Material No.03FAB1) to:
(a) FOR [202QM] (HOUSING-MLI NO 7 LEFT)
the new AIPC 28-43-05-21-150 O-RING (4) and new AIPC 28-43-05-21-160 O-RING (5)
(b) FOR [203QM] (HOUSING-MLI NO 7 RIGHT)
the new AIPC 28-43-05-24-150 O-RING (4) and the AIPC 28-43-05-24-160 O-RING (5).
(5) Install the O-ring (5) on to the base (2).
B. Installation of the Magnetic Level-Indicator Assembly 202QM (203QM)
(1) Apply a thin layer of Polysulfide Sealant-Fuel Tank Brushable - (Material No.06ABA1) to the interface of the bolts (6).
(2) Install the bolts (6), the O-rings (4), the MLI (7) and the nuts (3).
(3) Apply a thin layer of Polysulfide Sealant-Fuel Tank Brushable - (Material No.06ABA1) over the nuts (3) and the bolts (6).
(4) Bonding check:
(5) Make sure the float (1) moves smoothly along the complete length of the MLI tube.
Subtask 28-43-22-410-051-A ** ON A/C NOT FOR ALL (1) Apply a thin layer of Polysulfide Sealant-Fuel Tank Brushable - (Material No.06ABA1) to the interface of the bolts (6).
(2) Install the bolts (6), the O-rings (4), the MLI (7) and the nuts (3).
(3) Apply a thin layer of Polysulfide Sealant-Fuel Tank Brushable - (Material No.06ABA1) over the nuts (3) and the bolts (6).
(4) Bonding check:
WARNING:
THIS INSTRUCTION IS APPLICABLE TO A CRITICAL DESIGN CONFIGURATION CONTROL LIMITATION (CDCCL) ITEM. CAREFULLY OBEY ALL GIVEN INSTRUCTIONS WHEN YOU DO THIS STEP. IF YOU DO NOT OBEY THESE INSTRUCTIONS, A DANGEROUS CONDITION CAN OCCUR THAT CAN CAUSE A POSSIBLE FUEL TANK EXPLOSION.
(a) Do a bonding check (Ref. AMM TASK 20-28-00-912-802). (5) Make sure the float (1) moves smoothly along the complete length of the MLI tube.
C. Close Access
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Install the access panel (Ref. AMM TASK 57-27-11-400-002):
(a) FOR [202QM] (HOUSING-MLI NO 7 LEFT)
install 540QB
(b) FOR [203QM] (HOUSING-MLI NO 7 RIGHT)
install 640QB.
Subtask 28-43-22-650-053-A ** ON A/C NOT FOR ALL (1) Make sure that the work area is clean and clear of tools and other items.
(2) Install the access panel (Ref. AMM TASK 57-27-11-400-002):
(a) FOR [202QM] (HOUSING-MLI NO 7 LEFT)
install 540QB
(b) FOR [203QM] (HOUSING-MLI NO 7 RIGHT)
install 640QB.
D. Fuel Configuration
(1) Refuel or transfer fuel as necessary (Ref. AMM TASK 12-11-28-650-003) or (Ref. AMM TASK 28-25-00-869-001) until the applicable wing tank is filled to high level.
Subtask 28-43-22-790-051-A ** ON A/C NOT FOR ALL (1) Refuel or transfer fuel as necessary (Ref. AMM TASK 12-11-28-650-003) or (Ref. AMM TASK 28-25-00-869-001) until the applicable wing tank is filled to high level.
E. Test
(1) Put a CONTAINER - CLEAN, APPLICABLE directly below the MLI assembly (7) to collect all fuel that leaks.
(2) Monitor the MLI assembly (7) for a minimum period of one hour.
(3) Make sure that fuel does not leak from the MLI assembly (7).
5. Close-up(1) Put a CONTAINER - CLEAN, APPLICABLE directly below the MLI assembly (7) to collect all fuel that leaks.
(2) Monitor the MLI assembly (7) for a minimum period of one hour.
(3) Make sure that fuel does not leak from the MLI assembly (7).
Subtask 28-43-22-942-053-A ** ON A/C NOT FOR ALL
A. Removal of Equipment
(1) Remove the safety barriers.
(2) Remove the access platform(s).
(3) Remove the ground support and maintenance equipment, the special and standard tools and all other items.
(1) Remove the safety barriers.
(2) Remove the access platform(s).
(3) Remove the ground support and maintenance equipment, the special and standard tools and all other items.