DOC AIRBUS | TSM A320FFuel - Excessive (Too Much) Fuel (or Fluid Mixture) Found During Sumping At The Left (Right) Wing Vent/Surge-Tank Water Drain-Valve 21QM (22QM)
TASK 28-11-00-810-812-A
Fuel - Excessive (Too Much) Fuel (or Fluid Mixture) Found During Sumping At The Left (Right) Wing Vent/Surge-Tank Water Drain-Valve 21QM (22QM)
A. Referenced Information
3. Fault Confirmation
Subtask 28-11-00-710-063-B ** ON A/C NOT FOR ALL
Subtask 28-11-00-810-061-B ** ON A/C NOT FOR ALL
[Rev.8 from Aug 2018]
2026.04.04 04:28:27 UTC
Fuel - Excessive (Too Much) Fuel (or Fluid Mixture) Found During Sumping At The Left (Right) Wing Vent/Surge-Tank Water Drain-Valve 21QM (22QM)
WARNING:
OBEY THE FUEL SAFETY PROCEDURES.
1. Possible Causes- jet pump scavenge system
unwanted material (debris) - jet adaptor assembly
- JET PUMP-WATER SCAVENGE, L VENT SURGE TK or JET PUMP-WATER SCAVENGE, L VENT SURGE TK [66QM]
- JET PUMP-WATER SCAVENGE, R VENT SURGE TK or JET PUMP-WATER SCAVENGE, R VENT SURGE TK [69QM]
- CHECK VALVE-FUEL PUMP, L VENT SURGE TK [37QM]
- CHECK VALVE-FUEL PUMP, R VENT SURGE TK [38QM]
- CLACK VALVE [214QM]
- CLACK VALVE [215QM]
- CLACK VALVE [216QM]
- CLACK VALVE [217QM]
A. Referenced Information
| REFERENCE | DESIGNATION |
|---|---|
| TSM TASK 28-11-00-810-809-A | Fuel - Unwanted Material (Debris) In The Left (Right) Wing-Tank (Outboard of the Rib2) |
| TSM TASK 28-11-00-810-810-A | Fuel - Unwanted Material (Debris) In The Center-Tank Fuel Installation |
| TSM TASK 28-12-00-810-801-A | Fuel - Unwanted Transfer From The Left Wing Tank To The Center Tank At Any Time |
| AMM 28-00-00-000-001 | Removal of the Fuel Pipes |
| AMM 28-00-00-400-001 | Installation of the Fuel Pipes |
| AMM 28-11-00-280-002 | Structural Fuel Tank Leaks - General Information |
| AMM 28-11-42-000-002 | Removal of the Clack Valve |
| AMM 28-11-42-400-002 | Installation of the Clack Valve |
| AMM 28-12-00-00- | |
| AMM 28-12-00-200-001 | Inspection of the Tank Venting System |
| AMM 28-12-00-730-801 | Pressure Test of the Wing-Tank Vent System |
| AMM 28-12-00-730-802 | Pressure Test of the Center-Tank Vent System |
| AMM 28-21-00-00- | |
| AIPC 28210536 | |
| AIPC 28210537 | |
| AMM 28-21-43-000-003 | Removal of the Fuel-Pump Check-Valve |
| AMM 28-21-43-400-003 | Installation of the Fuel-Pump Check-Valve |
| AMM 28-21-53-000-001 | Removal of the Jet Pump |
| AMM 28-21-53-000-003 | Removal of the Jet Adaptor Assembly |
| AMM 28-21-53-400-001 | Installation of the Jet Pump |
| AMM 28-21-53-400-003 | Installation of the Jet Adaptor Assembly |
| AMM 28-25-00-650-003 | To Drain Remaining Fuel from the Wing Tanks and the Center Tank |
Subtask 28-11-00-710-063-B ** ON A/C NOT FOR ALL
A. Introduction
Read all of this paragraph before you start the work steps in Para. 3.B.
During normal aircraft operations on the ground or in flight, fuel can collect in the vent/surge-tank. If this occurs, a jet pump scavenge system moves the collected fuel back into the related wing-tank outer-cell AMM 28-21-00-00- and (Ref. DWG D28250007).
A minimum of one fuel-pump (in a wing-tank) must be in operation for the jet-pump scavenge system (of the same wing) to operate.
The jet pump scavenge system is made from small diameter/bore 0.5 in. (12.7000 mm) (outside diameter) pipe. The flow of fuel from the surge-tank to the wing-tank outer-cell is at a rate of approximately 7.7 l (2.0341 USgal) per minute. If the surge tank was full (with a capacity of 200 l (52.8340 USgal)), it will take approximately 26 minutes to empty the surge tank.
To get a complete fuel transfer to the wing-tank outer-cell the scavenge system must be given sufficient time.
The specified fuel quantities for each vent/surge tank are as follows:
If the jet pump scavenge system is unserviceable, the fuel that is ejected into the surge tank will stay there. It is normal for fuel:
If (in the left wing) the unserviceable conditions given above continued, the fuel-level in the left-wing vent/surge-tank can increase until it is above the level of the center-tank vent (duct/outlet-pipe at RIB22). Gravity can cause fuel to flow through the center-tank vent into the center-tank. The troubleshooting for this fault can be found in the TSM procedure 'Unwanted Transfer From The Left Wing Tank To The Center Tank At Any Time' (Ref. TSM TASK 28-12-00-810-801).
The fuel flow given here can also move unwanted material from the left wing vent/surge-tank to the center-tank.
This procedure is written for the aircraft left wing with the right wing LRUs given in (parenthesis) when applicable.
Subtask 28-11-00-710-062-A ** ON A/C NOT FOR ALL Read all of this paragraph before you start the work steps in Para. 3.B.
During normal aircraft operations on the ground or in flight, fuel can collect in the vent/surge-tank. If this occurs, a jet pump scavenge system moves the collected fuel back into the related wing-tank outer-cell AMM 28-21-00-00- and (Ref. DWG D28250007).
A minimum of one fuel-pump (in a wing-tank) must be in operation for the jet-pump scavenge system (of the same wing) to operate.
The jet pump scavenge system is made from small diameter/bore 0.5 in. (12.7000 mm) (outside diameter) pipe. The flow of fuel from the surge-tank to the wing-tank outer-cell is at a rate of approximately 7.7 l (2.0341 USgal) per minute. If the surge tank was full (with a capacity of 200 l (52.8340 USgal)), it will take approximately 26 minutes to empty the surge tank.
To get a complete fuel transfer to the wing-tank outer-cell the scavenge system must be given sufficient time.
The specified fuel quantities for each vent/surge tank are as follows:
- the Unusable Fuel Quantity is 0.5 l (0.1321 USgal)
- The Undrainable Fuel Quantity is 0.25 l (0.0660 USgal).
NOTE: The unusable fuel quantity is the volume of fuel that cannot be removed with the scavenge jet-pump 66QM (69QM) suction pick-up pipe.
The undrainable fuel quantity is volume of fuel that cannot be drained out of the tank at the water drain valve 21QM (22QM).
If the jet-pump scavenge system operates correctly, then the operation of the water drain in the surge tank should produce approximately 0.25 litres of fluid. If the system does not operate correctly (example, due to a blockage), a larger than usual unusable fuel quantity can be found. The undrainable fuel quantity is volume of fuel that cannot be drained out of the tank at the water drain valve 21QM (22QM).
If the jet pump scavenge system is unserviceable, the fuel that is ejected into the surge tank will stay there. It is normal for fuel:
- (small quantities) to enter the surge tank during each taxi turn (because of centrifugal force)
- to flow into the surge tank during take-off (because of the nose up attitude of the aircraft).
If (in the left wing) the unserviceable conditions given above continued, the fuel-level in the left-wing vent/surge-tank can increase until it is above the level of the center-tank vent (duct/outlet-pipe at RIB22). Gravity can cause fuel to flow through the center-tank vent into the center-tank. The troubleshooting for this fault can be found in the TSM procedure 'Unwanted Transfer From The Left Wing Tank To The Center Tank At Any Time' (Ref. TSM TASK 28-12-00-810-801).
The fuel flow given here can also move unwanted material from the left wing vent/surge-tank to the center-tank.
This procedure is written for the aircraft left wing with the right wing LRUs given in (parenthesis) when applicable.
B. Test
(1) There is no test (or inspection) of the fuel jet-pump scavenge system, but AIRBUS recommends that you continue as follows:
(a) At the drain valve 21QM (22QM), do the AMM procedure 'To Drain the Remaining Fuel from the Wing Tanks and the Center Tank' AMM 28-25-00-650-003.
(b) Measure the quantity of fuel (or fuel and water mixture) removed through the water drain-valve 21QM (22QM).
(c) If the quantity measured is:
(a) Monitor the amount of fuel drained from the left (right) vent/surge-tank water drain-valve 21QM (22QM) for the next five refuel procedures (or for five days).
(b) Do Para. 3.B.(1) (as applicable).
(c) If the quantity of fuel drained from the vent/surge-tank is seen to slowly increase each time you do the water drain procedure (but still less than 20 l (5.2834 USgal)), do Para. 4.A.
Subtask 28-11-00-710-063-C ** ON A/C NOT FOR ALL (1) There is no test (or inspection) of the fuel jet-pump scavenge system, but AIRBUS recommends that you continue as follows:
(a) At the drain valve 21QM (22QM), do the AMM procedure 'To Drain the Remaining Fuel from the Wing Tanks and the Center Tank' AMM 28-25-00-650-003.
(b) Measure the quantity of fuel (or fuel and water mixture) removed through the water drain-valve 21QM (22QM).
(c) If the quantity measured is:
- less than 0.25 l (0.0660 USgal), no more troubleshooting work steps are necessary
- more than 20 l (5.2834 USgal), do Para. 4.A.
- more than 0.25 l (0.0660 USgal) but less than 20 l (5.2834 USgal), do step (2).
(a) Monitor the amount of fuel drained from the left (right) vent/surge-tank water drain-valve 21QM (22QM) for the next five refuel procedures (or for five days).
(b) Do Para. 3.B.(1) (as applicable).
(c) If the quantity of fuel drained from the vent/surge-tank is seen to slowly increase each time you do the water drain procedure (but still less than 20 l (5.2834 USgal)), do Para. 4.A.
C. Introduction
Read all of this paragraph before you start the work steps in Para. 3.B.
During normal aircraft operations on the ground and in flight, fuel can collect in the vent/surge-tank. If this occurs, the clack valves 214QM (215QM) and 216QM (217QM) (that form a fuel return system) let the fuel move (back) to the related wing-tank AMM 28-12-00-00- and (Ref. DWG D28150065).
The specified fuel quantities for each vent/surge tank are as follows:
If the clack-valve return system is unserviceable, the fuel that is ejected into the surge tank will stay there. It is normal for fuel:
If one of the clack-valves becomes unserviceable in the closed position, (example, due to a blockage), the fuel return system efficiency is reduced to half.
If the two (both) of the clack-valves become unserviceable, in the closed position, (example, due to a blockage), the fuel will still collect in the vent/surge-tank but it will not go back to the related wing-tank. This fuel is now unusable.
If one of the clack-valves is incorrectly held open, fuel can incorrectly flow into the vent/surge-tank. This can be because of:
If (in the left wing) the unserviceable conditions given above continued, the fuel-level in the left-wing vent/surge-tank can increase until it is above the level of the center-tank vent (duct/outlet-pipe at RIB22). Gravity can cause fuel to flow through the center-tank vent into the center-tank. The troubleshooting for this fault can be found in the TSM procedure 'Unwanted Transfer From The Left Wing Tank To The Center Tank At Any Time' (Ref. TSM TASK 28-12-00-810-801).
The fuel flow described here can also transport/carry unwanted material from the left wing vent/surge-tank to the center-tank.
This procedure is written for the aircraft left wing with the right wing LRUs given in (parenthesis) when applicable.
Subtask 28-11-00-710-062-C ** ON A/C NOT FOR ALL Read all of this paragraph before you start the work steps in Para. 3.B.
During normal aircraft operations on the ground and in flight, fuel can collect in the vent/surge-tank. If this occurs, the clack valves 214QM (215QM) and 216QM (217QM) (that form a fuel return system) let the fuel move (back) to the related wing-tank AMM 28-12-00-00- and (Ref. DWG D28150065).
The specified fuel quantities for each vent/surge tank are as follows:
- the Unusable Fuel Quantity is 0.5 l (0.1321 USgal)
- The Undrainable Fuel Quantity is 0.25 l (0.0660 USgal).
NOTE: The unusable fuel quantity is the volume of fuel that cannot be removed with the clack-valve return system given before.
The undrainable fuel quantity is volume of fuel that cannot be drained out of the tank at the water drain valve 21QM (22QM).
If the clack-valve return system operates correctly, then the operation of the water drain in the surge tank should produce approximately 0.25 litres of fluid. If the fuel return system does not operate correctly (example, due to a blockage), a larger than usual unusable fuel quantity can be found. The undrainable fuel quantity is volume of fuel that cannot be drained out of the tank at the water drain valve 21QM (22QM).
If the clack-valve return system is unserviceable, the fuel that is ejected into the surge tank will stay there. It is normal for fuel:
- (small quantities) to enter the surge tank during each taxi turn (because of centrifugal force)
- to flow into the surge tank during take-off (because of the nose up attitude of the aircraft).
If one of the clack-valves becomes unserviceable in the closed position, (example, due to a blockage), the fuel return system efficiency is reduced to half.
If the two (both) of the clack-valves become unserviceable, in the closed position, (example, due to a blockage), the fuel will still collect in the vent/surge-tank but it will not go back to the related wing-tank. This fuel is now unusable.
If one of the clack-valves is incorrectly held open, fuel can incorrectly flow into the vent/surge-tank. This can be because of:
- an unserviceable valve movement (that is not completely free)
- unwanted material (located between the flap and the valve seat).
If (in the left wing) the unserviceable conditions given above continued, the fuel-level in the left-wing vent/surge-tank can increase until it is above the level of the center-tank vent (duct/outlet-pipe at RIB22). Gravity can cause fuel to flow through the center-tank vent into the center-tank. The troubleshooting for this fault can be found in the TSM procedure 'Unwanted Transfer From The Left Wing Tank To The Center Tank At Any Time' (Ref. TSM TASK 28-12-00-810-801).
The fuel flow described here can also transport/carry unwanted material from the left wing vent/surge-tank to the center-tank.
This procedure is written for the aircraft left wing with the right wing LRUs given in (parenthesis) when applicable.
D. Test
(1) Do an inspection of the applicable clack valves 214QM (215QM) and 216QM (217QM) as given in the Inspection of the Tank Venting System AMM 28-12-00-200-001. Also look for unwanted material (debris).
(a) If:
4. Fault Isolation(1) Do an inspection of the applicable clack valves 214QM (215QM) and 216QM (217QM) as given in the Inspection of the Tank Venting System AMM 28-12-00-200-001. Also look for unwanted material (debris).
(a) If:
- the clack valves are as specified and no unwanted material is found, no troubleshooting work steps are necessary
- the clack valves are as specified but unwanted material is found, do Para. 4.A. step (1)
- the clack valves are as not specified but no unwanted material is found, do Para. 4.A. step (4)
- the clack valves are as not specified and unwanted material is found, do all of Para. 4.A.
Subtask 28-11-00-810-061-B ** ON A/C NOT FOR ALL
A. Procedure
(1) In the applicable vent/surge tank get access to the jet-pump suction-line pick-up pipe inlet AIPC 28210536 AMM 28-12-00-200-001.
(a) Do a visual inspection of the end of the pick-up pipe and adjacent area forunwanted material (debris) .
1 If found, remove all unwanted material (debris).
2 Make sure that the vent/surge-tank contains no other unwanted material. Remove as necessary.
3 Make a careful estimate of (assess) the possibility that the unwanted material has moved to the other fuel-tanks.
a For the left wing-tank do:
1 Look for damage that could cause the pipe to become blocked.
2 If necessary, replace the pipe and all unserviceable pipe fittings.
(2) In the related wing-tank outer-cell get access to the jet-pump items that follow AIPC 28210537:
(a) The jet adaptor assembly AMM 28-21-53-000-003 and AMM 28-21-53-400-003.
(b) The JET PUMP-WATER SCAVENGE, L VENT SURGE TK or JET PUMP-WATER SCAVENGE, L VENT SURGE TK [66QM] ( JET PUMP-WATER SCAVENGE, R VENT SURGE TK or JET PUMP-WATER SCAVENGE, R VENT SURGE TK [69QM] ) AMM 28-21-53-000-001 and AMM 28-21-53-400-001.
(c) The CHECK VALVE-FUEL PUMP, L VENT SURGE TK [37QM] ( CHECK VALVE-FUEL PUMP, R VENT SURGE TK [38QM] ) AMM 28-21-43-000-003 and AMM 28-21-43-400-003.
(d) The jet-pump pressurized-line, between the fuel-manifold (adjacent to the check valves 33QM (35QM) and 34QM (36QM), in-board of RIB2) and the jet-pump 66QM (69QM).
(e) The jet-pump suction-line, between the Rib 22 through connection and the jet-pump 66QM (69QM).
(f) The jet-pump (output/discharge) pipe-line, between the jet-pump 66QM (69QM) and the fuel discharge (outlet) adjacent to the intercell transfer valve 28QM (30QM) (outboard of RIB15).
(g) Repair/replace all the unserviceable fuel pipes and connections AMM 28-00-00-000-001 and AMM 28-00-00-400-001.
(3) If the fault continues (or if this is the second time this fault has occured), do the steps that follow:
(a) Do a leak test of the applicable Rib 22 as given in the AMM procedure 'Fuel Tank Leak Checks' AMM 28-11-00-280-002.
(b) If the fault continues, do step (4).
(4) Do the applicable leak test:
Subtask 28-11-00-810-061-C ** ON A/C NOT FOR ALL (1) In the applicable vent/surge tank get access to the jet-pump suction-line pick-up pipe inlet AIPC 28210536 AMM 28-12-00-200-001.
(a) Do a visual inspection of the end of the pick-up pipe and adjacent area for
1 If found, remove all unwanted material (debris).
2 Make sure that the vent/surge-tank contains no other unwanted material. Remove as necessary.
3 Make a careful estimate of (assess) the possibility that the unwanted material has moved to the other fuel-tanks.
NOTE: This can occur if the unwanted material items are small (example, 10 mm (0.4 in) across) and of neutral buoyancy (does not sink to the bottom or float to the top).
4 If necessary, do the TSM procedures that follow: a For the left wing-tank do:
- Unwanted Material (Debris) In The Left (Right) Wing-Tank (Outboard of the Rib 2) (Ref. TSM TASK 28-11-00-810-809)
- Unwanted Material (Debris) In The Center-Tank Fuel Installation (Ref. TSM TASK 28-11-00-810-810).
- Unwanted Material (Debris) In The Left (Right) Wing-Tank (Outboard of the Rib 2) (Ref. TSM TASK 28-11-00-810-809).
1 Look for damage that could cause the pipe to become blocked.
2 If necessary, replace the pipe and all unserviceable pipe fittings.
(2) In the related wing-tank outer-cell get access to the jet-pump items that follow AIPC 28210537:
(a) The jet adaptor assembly AMM 28-21-53-000-003 and AMM 28-21-53-400-003.
(b) The JET PUMP-WATER SCAVENGE, L VENT SURGE TK or JET PUMP-WATER SCAVENGE, L VENT SURGE TK [66QM] ( JET PUMP-WATER SCAVENGE, R VENT SURGE TK or JET PUMP-WATER SCAVENGE, R VENT SURGE TK [69QM] ) AMM 28-21-53-000-001 and AMM 28-21-53-400-001.
(c) The CHECK VALVE-FUEL PUMP, L VENT SURGE TK [37QM] ( CHECK VALVE-FUEL PUMP, R VENT SURGE TK [38QM] ) AMM 28-21-43-000-003 and AMM 28-21-43-400-003.
(d) The jet-pump pressurized-line, between the fuel-manifold (adjacent to the check valves 33QM (35QM) and 34QM (36QM), in-board of RIB2) and the jet-pump 66QM (69QM).
(e) The jet-pump suction-line, between the Rib 22 through connection and the jet-pump 66QM (69QM).
(f) The jet-pump (output/discharge) pipe-line, between the jet-pump 66QM (69QM) and the fuel discharge (outlet) adjacent to the intercell transfer valve 28QM (30QM) (outboard of RIB15).
(g) Repair/replace all the unserviceable fuel pipes and connections AMM 28-00-00-000-001 and AMM 28-00-00-400-001.
(3) If the fault continues (or if this is the second time this fault has occured), do the steps that follow:
(a) Do a leak test of the applicable Rib 22 as given in the AMM procedure 'Fuel Tank Leak Checks' AMM 28-11-00-280-002.
(b) If the fault continues, do step (4).
(4) Do the applicable leak test:
- Leak Test of the left(right) Wing-Tank Vent Duct AMM 28-12-00-730-801
- Leak Test of the Center-Tank Vent Pipe/Duct AMM 28-12-00-730-802.
A. Procedure.
(1) Identify theunwanted material (debris) found.
(a) If the unwanted material:
(3) When more than one object (item) is found do the steps that follow:
(a) Remove all the unwanted material adjacent to the clack valve(s).
(b) Make sure that the vent/surge-tank contains no other unwanted material. Remove as necessary.
(c) Make a careful estimate of (assess) the possibility that the unwanted material has moved to the other fuel-tanks.
1 If the unwanted material was found in:
a The left wing vent/surge-tank do:
(5) If the fault continues (or if this is the second time this fault has occured), do the steps that follow:
(a) Do a leak test of the applicable Rib 22 as given in the AMM procedure 'Fuel Tank Leak Checks' AMM 28-11-00-280-002.
(b) If the fault continues, do step (6).
(6) Do the applicable leak test:
(1) Identify the
(a) If the unwanted material:
- is one object (item), do step (2)
- is more than one object (item), do step (3).
(3) When more than one object (item) is found do the steps that follow:
(a) Remove all the unwanted material adjacent to the clack valve(s).
(b) Make sure that the vent/surge-tank contains no other unwanted material. Remove as necessary.
(c) Make a careful estimate of (assess) the possibility that the unwanted material has moved to the other fuel-tanks.
NOTE: This can occur if the unwanted material items are small (example, 10 mm (0.4 in) across) and of neutral buoyancy (does not sink to the bottom or float to the top).
(d) If necessary, do the TSM procedures that follow: 1 If the unwanted material was found in:
a The left wing vent/surge-tank do:
- Unwanted Material (Debris) In The Left (Right) Wing-Tank (Outboard of the Rib 2) (Ref. TSM TASK 28-11-00-810-809)
- Unwanted Material (Debris) In The Center-Tank Fuel Installation (Ref. TSM TASK 28-11-00-810-810).
- Unwanted Material (Debris) In The Left (Right) Wing-Tank (Outboard of the Rib 2) (Ref. TSM TASK 28-11-00-810-809).
(5) If the fault continues (or if this is the second time this fault has occured), do the steps that follow:
(a) Do a leak test of the applicable Rib 22 as given in the AMM procedure 'Fuel Tank Leak Checks' AMM 28-11-00-280-002.
(b) If the fault continues, do step (6).
(6) Do the applicable leak test:
- Leak Test of the left(right) Wing-Tank Vent Duct AMM 28-12-00-730-801
- Leak Test of the Center-Tank Vent Pipe/Duct AMM 28-12-00-730-802.