Fuel - Leak Monitor 500QM (Center Tank/Wingbox) Shows Leakage

TASK 28-11-00-810-801-A
Fuel - Leak Monitor 500QM (Center Tank/Wingbox) Shows Leakage

WARNING: OBEY THE FUEL SAFETY PROCEDURES.

1. Possible Causes

damage to the structure
damaged or loose fasteners
incorrect installion of components
damaged seals, o-rings or sealant

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
AMM 12-11-28-650-003	Pressure Refuel with Automatic Control
AMM 28-11-00-200-002	Check Leak Monitor for Evidence of Fuel Leakage and Correct Closure of the Valve
AMM 28-11-00-280-002	Structural Fuel Tank Leaks - General Information
AMM 28-11-00-790-002	Leak Test with Fuel of the Wing-Tank Outer and Inner Cells
AMM 28-11-00-790-003	Leak Test of the Center Tank
AMM 28-11-00-790-005	Leak Test of the Wing Tanks and Vent Surge Tank (without Fuel) by the Local Blowing Procedure
AMM 28-11-00-790-007	Leak Test of the Left Wing and Vent Surge Tanks and the Center Tank (without Fuel) by the Vacuum and Dye Procedure
AMM 28-11-00-790-008	Leak Test with Fuel of the Wing Tank
AMM 28-11-00-790-009	Leak Test of the Fuel Tanks - Without Fuel - Helium Procedure
AMM 28-13-00-200-001	Check Drain Mast Outlet for Obstruction
AMM 28-13-00-700-001	Functional Check (Pressure and Free Flow) of Vapor Seal and Vent/Drain System
AMM 28-13-42-000-001	Removal of the Vapor Seal
AMM 28-13-42-300-001	Center Tank Vapor Seal Membrane Repair
AMM 28-13-42-400-001	Installation of the Vapor Seal
AMM 28-13-43-000-001	Removal of the Drain Mast
AMM 28-13-43-400-001	Installation of the Drain Mast
AMM 28-18-00-200-001	Detailed Inspection of Vapor Seal (Aircraft Fitted with a Center Tank)
SRM 517612
AMM 51-76-12-300-001	Local Repair of the Fuel Tank Sealant
AMM 51-76-12-300-002	Repair of the Fuel Tank Fillet
AMM 51-76-12-300-003	Temporary External Repair of the Fuel Tank

3. Fault Confirmation
Subtask 28-11-00-710-050-B ** ON A/C NOT FOR ALL

A. Test
(1) Read the Topic, Fuel Tank Leak Checks AMM 28-11-00-280-002.
(2) To find the fuel leak, do the leak tests that follow:

NOTE: The cause of fuel leaks are:

damage to the structure
damaged or loose fasteners
incorrect installion of components
damaged seals, o-rings or sealant.

(3) If a fuel leak is found obey the instructions AMM 28-11-00-280-002 and go to Para. 4.A. if/when applicable.

Subtask 28-11-00-710-050-D ** ON A/C NOT FOR ALL

A. Test
(1) Read the Topic, Fuel Tank Leak Checks AMM 28-11-00-280-002.
(2) To find the fuel leak, do the leak tests that follow:

NOTE: The cause of fuel leaks are:

damage to the structure
damaged or loose fasteners
incorrect installion of components
damaged seals, o-rings or sealant.

(3) If a fuel leak is found obey the instructions AMM 28-11-00-280-002 and go to Para. 4.A. if/when applicable.

4. Fault Isolation
Subtask 28-11-00-810-050-A

A. Procedure
(1) Repair all the leaks:
(a) In the tanks AMM 28-11-00-280-002:

Local Repair of Fuel Tank Sealant AMM 51-76-12-300-001
Repair of Fuel Tank Fillet AMM 51-76-12-300-002
Temporary External Repair of the Fuel Tank AMM 51-76-12-300-003
Detailed Fuel Tank Repair Data SRM 517612.

(b) In the fuel pipes:

Replace or repair (Ref. Fuel Pipe Repair Manual - FPRM).

Replace (Ref. Removal and Installation (R & I) Procedures).

(2) When the fuel leak repair is complete, do the procedures that follow:
(a) Do a Detailed Inspection of the Vapour Seal AMM 28-18-00-200-001.
1 If necessary, repair AMM 28-13-42-300-001 or replace the vapour seal AMM 28-13-42-000-001 and AMM 28-13-42-400-001.
(b) Check the Drain Mast Outlet for Obstruction AMM 28-13-00-200-001.
1 If necessary, remove the blockage or replace the drain mast AMM 28-13-43-000-001 and AMM 28-13-43-400-001.
(c) Do the Functional Test of the Center Box/Tank Vapour Seal and Vent/Drain System AMM 28-13-00-700-001.
(d) Refuel, to full (high level cut off) the applicable/repaired tank(s) AMM 12-11-28-650-003.
(e) Do a check of the Fuel Leak Monitor 500QM for evidence of fuel leakage AMM 28-11-00-200-002.

[Rev.8 from Aug 2018] 2026.04.04 04:28:25 UTC