Fuel, Main Transfer System - Right Wing Tank Overflow

TASK 28-26-00-810-809-A
Fuel, Main Transfer System - Right Wing Tank Overflow

WARNING: OBEY THE FUEL SAFETY PROCEDURES.

1. Possible Causes

CLACK VALVE [215QM]
CLACK VALVE [217QM]
SDAC-1 [1WV1]
SDAC-2 [1WV2]
Transfer Control Valve 2 (Right) does not close
Main Transfer System Auto Control Failure
JET PUMP-WATER SCAVENGE, R WING TK [68QM]

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
TSM TASK 28-12-00-810-801-A	Fuel - Unwanted Transfer From The Left Wing Tank To The Center Tank At Any Time
TSM TASK 28-21-00-810-849-A	MAIN FUEL PUMP SYSTEM - Right Wing Tank Overflow
TSM TASK 28-26-00-810-801-A	Fuel, Main Transfer System - Auto Control Failure
TSM TASK 28-26-00-810-805-A	Fuel, Main Transfer System - Control Valve 2 (Right) Does Not Close
TSM TASK 28-46-00-810-812-A	L(R) Surge Tank Overflow Sensor 28QJ1(2)
TSM TASK 31-55-00-810-801-A	Unwanted (Spurious) Warnings/Indications involving the SDAC
AMM 28-11-42-000-002	Removal of the Clack Valve
AMM 28-11-42-400-002	Installation of the Clack Valve
AMM 28-12-00-200-001	Inspection of the Tank Venting System
AMM 28-21-53-000-001	Removal of the Jet Pump
AMM 28-21-53-400-001	Installation of the Jet Pump
AMM 28-26-00-710-001	Operational Test of the Main Transfer System
ASM 282601
AMM 28-46-00-740-001	Functional (BITE) Test
ASM 284603
ASM 284604

3. Fault Confirmation
Subtask 28-26-00-865-051-A

A. Table of the circuit breakers referred to in this procedure:

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C NOT FOR ALL
121VU	FUEL/CTR TK/L&R XFR/CTL & IND	2QL	R26
121VU	FUEL/CTR TK/L&R XFR/CTL & IND	1QL	R25

Subtask 28-26-00-710-058-A ** ON A/C NOT FOR ALL

B. Test

During aircraft operations on the ground and in flight, it is possible for fuel to get into the vent/surge-tank. If this occurs during normal (serviceable) operation the jet pump(68QM) will let the fuel move back into the related wing-tank.

If the jet pump become unserviceable, fuel can collect in the related vent/surge-tank. The collected fuel quantity will increase (cumulatively in separate, successive additions) until the status of the related sensor 28QJ2 changes from dry to wet.

This can cause the two related results that follow:

the ECAM warning 'FUEL R WING TK OVERFLOW' will be given, if in an applicable flight phase
the P/BSW-FUEL/CTR TK/R XFR (6QL) FAULT legend will light, if it was set to the on (pushed in) position.

NOTE: You can get more data from the Aircraft Schematic Manual (ASM) ASM 282601 ASM 284603 and ASM 284604.

(1) If the FAULT legend of the P/BSW-6QL comes on, set the P/BSW to OFF (released out) to prevent a possible fuel spill.
(2) Make sure that the C/Bs 1QL and 2QL are closed.

NOTE: The 28VDC supplies related to this procedure are as follows:

C/B-1QL supplies the FAULT indication circuit in the P/BSW-FUEL/CTR TK/R XFR (6QL).
C/B-2QL supplies the level sensor 28QJ2 channel in the FLSCU-2 (9QJ) and the actuator control valve of jet pump 2 (center-tank, right-side transfer)

(3) Read:

the MAINTENANCE NOTICE, MAIN TRANSFER SYSTEM - SPURIOUS L(R) WING TANK OVERFLOW WARNING (Ref. P. Block 301).

(4) Do the Functional (BITE) Test of the FLSS AMM 28-46-00-740-001.
(5) Examine the FLSS STATUS page for the message 284616 R SURGE SENSOR 28QJ2:
(a) If the message:

is shown, do step (6) and then step (7)
is not shown, do step (7).

(6) Do the TSM procedure (Ref. TSM TASK 28-46-00-810-812).
(7) Do the Operational Test of the Main Transfer Control System AMM 28-26-00-710-001.

if a new fault occurs (or shows during the Operational Test) refer to Troubleshooting, Fault Symptoms with the new related fault symptom(s) to find the applicable TSM procedure number(s).
if the test operates as specified, do the steps given in Para. 4.A.

Subtask 28-26-00-710-058-B ** ON A/C NOT FOR ALL

B. Test

During aircraft operations on the ground and in flight, it is possible for fuel to get into the vent/surge-tank. If this occurs during normal (serviceable) operation the clack valves will let the fuel move back into the related wing-tank.

If the two clack valves 215QM and 217QM become unserviceable, in the closed position, fuel can collect in the related vent/surge-tank. The collected fuel quantity will increase (cumulatively in separate, successive additions) until the status of the related sensor 28QJ2 changes from dry to wet.

This can cause the two related results that follow:

the ECAM warning 'FUEL R WING TK OVERFLOW' will be given, if in an applicable flight phase
the P/BSW-FUEL/CTR TK/R XFR (6QL) FAULT legend will light, if it was set to the on (pushed in) position.

NOTE: You can get more data from the Aircraft Schematic Manual (ASM) ASM 282601 ASM 284603 and ASM 284604.

(1) If the FAULT legend of the P/BSW-6QL comes on, set the P/BSW to OFF (released out) to prevent a possible fuel spill.
(2) Make sure that the C/Bs 1QL and 2QL are closed.

NOTE: The 28VDC supplies related to this procedure are as follows:

C/B-1QL supplies the FAULT indication circuit in the P/BSW-FUEL/CTR TK/R XFR (6QL).
C/B-2QL supplies the level sensor 28QJ2 channel in the FLSCU-2 (9QJ) and the actuator control valve of jet pump 2 (center-tank, right-side transfer)

(3) Read:

the MAINTENANCE NOTICE, MAIN TRANSFER SYSTEM - SPURIOUS L(R) WING TANK OVERFLOW WARNING (Ref. P. Block 301).

(4) Do the Functional (BITE) Test of the FLSS AMM 28-46-00-740-001.
(5) Examine the FLSS STATUS page for the message 284616 R SURGE SENSOR 28QJ2:
(a) If the message:

is shown, do step (5) and then step (6)
is not shown, do step (6).

(6) Do the TSM procedure (Ref. TSM TASK 28-46-00-810-812).
(7) Do the Operational Test of the Main Transfer Control System AMM 28-26-00-710-001.

if a new fault occurs (or shows during the Operational Test) refer to Troubleshooting, Fault Symptoms with the new related fault symptom(s) to find the applicable TSM procedure number(s).
if the test operates as specified, do the steps given in Para. 4.A.

Subtask 28-26-00-710-058-C ** ON A/C NOT FOR ALL

B. Test

During aircraft operations on the ground and in flight, it is possible for fuel to get into the vent/surge-tank. If this occurs during normal (serviceable) operation the jet pump (66QM) will let the fuel move back into the related wing-tank.

If the jet pump (66QM) become unserviceable, fuel can collect in the related vent/surge-tank. The collected fuel quantity will increase (cumulatively in separate, successive additions) until the status of the related sensor 28QJ1 changes from dry to wet.

This can cause the two related results that follow:

the ECAM warning 'FUEL L WING TK OVERFLOW' will be given, if in an applicable flight phase
the P/BSW-FUEL/CTR TK/L XFR (5QL) FAULT legend will light, if it was set to the on (pushed in) position.

In the left wing it can also cause the fuel level to increase until it is above the level of the center-tank vent (duct/outlet-pipe at RIB22). Gravity can then cause fuel flow through the center-tank vent and into the center tank (Ref. TSM TASK 28-12-00-810-801).

NOTE: You can get more data from the Aircraft Schematic Manual (ASM) ASM 282601 ASM 284603 and ASM 284604.

(1) If the FAULT legend of the P/BSW-5QL comes on, set the P/BSW to OFF (released out) to prevent a possible fuel spill.
(2) Make sure that the C/Bs 1QL and 2QL are closed.

NOTE: The 28VDC supplies related to this procedure are as follows:

C/B-1QL supplies the level sensor 28QJ1 channel in the FLSCU-1 (7QJ) and the actuator control valve of jet pump 1 (center-tank, left-side transfer)
C/B-2QL supplies the FAULT indication circuit in the P/BSW-FUEL/CTR TK/L XFR (5QL).

(3) Do the Functional (BITE) Test of the FLSS AMM 28-46-00-740-001.
(4) Examine the FLSS STATUS page for the message 284616 L SURGE SENSOR 28QJ1:
(a) If the message:

is shown, do step (5) and then step (6)
is not shown, do step (6).

(5) Do the TSM procedure (Ref. TSM TASK 28-46-00-810-812).
(6) Do the Operational Test of the Main Transfer Control System AMM 28-26-00-710-001.

if a new fault occurs (or shows during the Operational Test) refer to Troubleshooting, Fault Symptoms with the new related fault symptom(s) to find the applicable TSM procedure number(s)
if the test operates as specified, do the steps given in Para. 4.A.

4. Fault Isolation
Subtask 28-26-00-810-058-A ** ON A/C NOT FOR ALL

A. Procedure
(1) Get access to the right wing fuel-tank inboard side of Rib 22 AMM 28-12-00-200-001.
(2) Inspect the tank tank venting system AMM 28-12-00-200-001 and replace, if necessary, the items that follow:

CLACK VALVE [215QM] and CLACK VALVE [217QM] AMM 28-11-42-000-002 and AMM 28-11-42-400-002.

(3) Do the TSM procedure Unwanted (Spurious) Warnings/Indications involving the SDAC-1 [1WV1] ( SDAC-2 [1WV2] (Ref. TSM TASK 31-55-00-810-801).
(4) If the fault continues, do the Fault Isolation Procedures (in Para. 4.A.), of the TSM Tasks that follow:
(a) Transfer Control Valve 2 (Right) does not close - (Ref. TSM TASK 28-26-00-810-805).
(b) Main Transfer System Auto Control Failure - (Ref. TSM TASK 28-26-00-810-801).
(5) If the fault continues:

Do the TSM Procedure (Ref. TSM TASK 28-21-00-810-849).

Subtask 28-26-00-810-058-B ** ON A/C NOT FOR ALL

A. Procedure
(1) Get access to the right wing fuel-tank inboard side of Rib 22 AMM 28-12-00-200-001.
(2) Inspect the tank tank venting system AMM 28-12-00-200-001 replace, if necessary, the items that follow:

the JET PUMP-WATER SCAVENGE, R WING TK [68QM] AMM 28-21-53-000-001 and AMM 28-21-53-400-001.

Do the TSM Procedure (Ref. TSM TASK 28-21-00-810-849).

[Rev.8 from Aug 2018] 2026.04.04 04:28:47 UTC