DOC AIRBUS | AMM A320FInstallation of the Magnetic Level-Indicator Assembly
TASK 28-43-22-400-002-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 28-43-22-941-053-A ** ON A/C NOT FOR ALL
Subtask 28-43-22-420-056-B ** ON A/C NOT FOR ALL
Subtask 28-43-22-942-051-A ** ON A/C NOT FOR ALL
[Rev.10 from 2021]
2026.04.02 06:18:13 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:
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.
WARNING:
BE CAREFUL WHEN YOU USE CONSUMABLE MATERIALS. OBEY THE MATERIAL MANUFACTURER'S INSTRUCTIONS AND YOUR LOCAL REGULATIONS.
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.06HAA1) | Coating Sealant-Fuel Tank Brushable - |
| (Material No.08BAA9) | Non Aqueous Cleaner-General - - |
| (Material No.14SBA1) | Textile-Lint free Cotton - |
| ZONE/ACCESS | ZONE DESCRIPTION |
|---|---|
| FOR [64QM] (HOUSING-MLI, L WING TK OUTR) | |
| 540RB | |
| FOR [65QM] (HOUSING-MLI, R WING TK OUTR) | |
| 640RB | |
| FIG.ITEM | DESIGNATION | IPC-CSN |
|---|---|---|
| 4 | O-RING | AIPC 28-43-05-21-150 |
| 5 | O-RING | AIPC 28-43-05-21-160 |
| 4 | O-RING | AIPC 28-43-85-20-090 |
| 5 | O-RING | AIPC 28-43-85-20-100 |
| 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 28-43-22-941-053-A ** ON A/C NOT FOR ALL
A. Safety Precautions
(2) Make sure that the SAFETY BARRIER(S) is in position.
Subtask 28-43-22-860-051-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 540RB (640RB).
(4) Make sure that the applicable access panel 540RB (640RB) 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 540RB (640RB).
(4) Make sure that the applicable access panel 540RB (640RB) is removed (Ref. AMM TASK 57-27-11-000-002) and (Ref. AMM TASK 28-10-00-910-002).
Subtask 28-43-22-420-056-B ** ON A/C NOT FOR ALL
A. Preparation for Installation
(1) Make sure that the parts retained from the removed component are clean and in the correct condition.
(2) Clean the component interface and/or the adjacent area with a clean Textile-Lint free Cotton - (Material No.14SBA1) made moist with Non Aqueous Cleaner-General - - (Material No.08BAA9) .
(3) Do an inspection of the component interfaces and the adjacent area.
(4) Soak the AIPC 28-43-05-21-150 O-RING (4) or AIPC 28-43-85-20-090 O-RING (4) and AIPC 28-43-05-21-160 O-RING (5) or AIPC 28-43-85-20-100 O-RING (5) in Turbine Fuel-- Kerosene - (Material No.01ABA1) .
Subtask 28-43-22-420-052-A ** ON A/C NOT FOR ALL (1) Make sure that the parts retained from the removed component are clean and in the correct condition.
(2) Clean the component interface and/or the adjacent area with a clean Textile-Lint free Cotton - (Material No.14SBA1) made moist with Non Aqueous Cleaner-General - - (Material No.08BAA9) .
(3) Do an inspection of the component interfaces and the adjacent area.
(4) Soak the AIPC 28-43-05-21-150 O-RING (4) or AIPC 28-43-85-20-090 O-RING (4) and AIPC 28-43-05-21-160 O-RING (5) or AIPC 28-43-85-20-100 O-RING (5) in Turbine Fuel-- Kerosene - (Material No.01ABA1) .
B. Installation of the Magnetic Level-Indicator Assembly 64QM (65QM)
(1) Install the O-ring (5) on to the base (2).
(2) Apply a thin layer of Coating Sealant-Fuel Tank Brushable - (Material No.06HAA1) to the interface of the bolts (6).
(3) Install the bolts (6), the O-rings (4) and the nuts (3).
(4) Bonding check:
(5) Apply a thin layer of Coating Sealant-Fuel Tank Brushable - (Material No.06HAA1) over the nuts (3) and the bolts (6).
(6) Make sure the float (1) moves smoothly along the complete length of the MLI tube.
Subtask 28-43-22-410-050-A ** ON A/C NOT FOR ALL (1) Install the O-ring (5) on to the base (2).
(2) Apply a thin layer of Coating Sealant-Fuel Tank Brushable - (Material No.06HAA1) to the interface of the bolts (6).
(3) Install the bolts (6), the O-rings (4) and the nuts (3).
(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) Apply a thin layer of Coating Sealant-Fuel Tank Brushable - (Material No.06HAA1) over the nuts (3) and the bolts (6).
(6) 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 [64QM] (HOUSING-MLI, L WING TK OUTR)
install 540RB
(b) FOR [65QM] (HOUSING-MLI, R WING TK OUTR)
install 640RB.
Subtask 28-43-22-650-052-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 [64QM] (HOUSING-MLI, L WING TK OUTR)
install 540RB
(b) FOR [65QM] (HOUSING-MLI, R WING TK OUTR)
install 640RB.
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 outer tank is filled to high level.
Subtask 28-43-22-790-050-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 outer tank is filled to high level.
NOTE: If the adjacent inner tank is empty, fuel will be go into the inner tank first. When the two low level sensors are wet (approximately 750 kg (1653.4665 lb) to 800 kg (1763.6976 lb) of fuel) the two intercell transfer valves will close. The outer tank will then fill with fuel.
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 28-43-22-942-051-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.