Fuel - Tank Venting, L(R) Wing Tank (Outer Cell) Overpressure Protector 102QM(103QM) Broken

TASK 28-12-00-810-804-A
Fuel - Tank Venting, L(R) Wing Tank (Outer Cell) Overpressure Protector 102QM(103QM) Broken

WARNING: OBEY THE FUEL SAFETY PROCEDURES.

CAUTION: DO NOT LET THE REFUEL PRESSURE BE MORE THAN THE MAXIMUM SAFE PRESSURE OF 50psi (3.45bar).

1. Possible Causes

the refuel supply pressure is above the safe limit
VALVE-FLOAT VENT, L WING TK OUTR [15QM]
VALVE-FLOAT VENT, R WING TK OUTR [18QM]
refuel spill pipe
PROTECTOR-OVERPRESSURE, L WING TK [102QM]
PROTECTOR-OVERPRESSURE, R WING TK [103QM]

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
TSM TASK 28-11-00-810-808-A	Fuel - Unwanted Material (Debris) In The Left (Right) Wing Fuel-Tank Collector-Cell Installation
TSM TASK 28-11-00-810-809-A	Fuel - Unwanted Material (Debris) In The Left (Right) Wing-Tank (Outboard of the Rib2)
TSM TASK 28-15-00-810-815-A	Unwanted Fuel Transfer (Migration) Between The Outer and Inner Cells of The Same Wing When The ECAM FUEL System Page ICTV Indications Show Correct
AMM 28-12-00-00-
AMM 28-12-00-200-001	Inspection of the Tank Venting System
AMM 28-12-41-000-002	Removal of the Overpressure Protector
AMM 28-12-41-200-001	Inspection of the Overpressure Protector
AMM 28-12-41-400-002	Installation of the Overpressure Protector
AMM 28-12-43-000-001	Removal of the Vent Float-Valve
AMM 28-12-43-400-001	Installation of the Vent Float-Valve
AMM 28-12-46-000-001	Removal of the Overpressure-Protector Outlet
AMM 28-12-46-400-001	Installation of the Overpressure-Protector Outlet

3. Fault Confirmation
Subtask 28-12-00-710-053-A ** ON A/C NOT FOR ALL

A. Test

NOTE: The function of the overpressure protector 102QM(103QM) is to protect the L(R) wing-tank outer-cell structure from possible damage.
The operation of the overpressure protector 102QM(103QM) will safely release the (unwanted) pressure to the atmosphere through the L(R) wing-tank inner-cell ventilation system.
The defects that follow (and/or) can cause the over pressure protector 102QM(103QM) to break/operate:

the refuel supply pressure is above the safe limit
the refuel spill pipe is blocked
the float vent valve 15QM(18QM) cannot open (or sufficiently) to release the (unwanted) pressure.

(1) Do the Inspection of the Overpressure Protector 102QM(103QM) AMM 28-12-41-200-001.
(a) If the overpressure protector 102QM(103QM):

and the related items are as specified, no more troubleshooting work steps are necessary
is found to be serviceable but the related items are not as specified (example, corroded, wire mesh damaged), make them good before you do the close-up
safety disc has operated (is broken or damaged), do Para. 4.A.

NOTE: The overpressure protector 102QM(103QM) is included as a Possible Cause in the related TSM procedure (Unwanted Fuel Transfer (Migration) Between The Outer and Inner Cells of The Same Wing When The ECAM FUEL System Page ICTV Indications Show Correct (Ref. TSM TASK 28-15-00-810-815)).

4. Fault Isolation
Subtask 28-12-00-810-053-A ** ON A/C NOT FOR ALL

A. Procedure

NOTE: Read all of the steps in this paragraph before you start work.
The order in which the work steps are done is best decided by the maintenance staff together with:

other malfunction indications
the fuel configuration
the aircraft location.

(1) If the (frangible) overpressure protector 102QM(103QM) has operated (is broken), it is important to do all the steps that follow to find what caused it to break.

NOTE: The reasons why a burst disc can break are as follows:

a defective/unserviceable disk (non standard)
that breaks below the (its) correct operating pressure
a serviceable disk that operated because the pressure difference between the center tank and the adjacent left wing tank was more than the correct safe operating pressure AMM 28-12-00-00-.

(2) Do a check of the applicable fuel tanker or fuel hydrant hose end pressure.
(a) If the fuel pressure is more than 50psi (3.45bar):

change the fuel pressure if possible or
get another source of fuel supplied at the correct pressure.

NOTE: If the fuel tanker or fuel hydrant hose end pressure is more than the maximum safe pressure it can cause:

a refuel valve that has been commanded to shut, to stay open
a overpressure protector (burst disc) to operate
damage to the refuel gallery.

(3) Do an Inspection of the Tank Venting System items that follow AMM 28-12-00-200-001:
(a) The VALVE-FLOAT VENT, L WING TK OUTR [15QM] ( VALVE-FLOAT VENT, R WING TK OUTR [18QM] ) and replace, if necessary, AMM 28-12-43-000-001 and AMM 28-12-43-400-001.
(b) The related refuel spill pipe and replace, if necessary, all unserviceable items (example, damaged or blocked) AMM 28-12-46-000-001 and AMM 28-12-46-400-001.
(4) Do the procedures and if necessary remove any unwanted material from the wing tank (Ref. TSM TASK 28-11-00-810-808) and (Ref. TSM TASK 28-11-00-810-809).
(5) Replace the PROTECTOR-OVERPRESSURE, L WING TK [102QM] ( PROTECTOR-OVERPRESSURE, R WING TK [103QM] ) AMM 28-12-41-000-002 and AMM 28-12-41-400-002.
(6) If, when all the tests and inspections are complete:
(a) The cause(s) of the operation (broken/damaged) of the overpressure protector 102QM(103QM) has(have) been found (and all the unserviceable LRUs have been replaced):
1 Refuel the aircraft and return it to service.
(b) If no cause of the operation of the overpressure protector 102QM(103QM) is found and all the unserviceable LRUs have been replaced:
1 Put the aircraft back into operation.
2 Send the damaged overpressure protector 102QM(103QM) to the vendor.
3 If the fault continues, refer the problem to AIRBUS.

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