INTERCELL TRANSFER - DESCRIPTION AND OPERATION

** ON A/C NOT FOR ALL

1. General
The wing tanks have an inner and an outer cell that are divided by the sealed RIB 15 (Ref. AMM D/O 28-11-00-00). The two intercell transfer valves in each wing are near to the bottom of the RIB 15. Fuel in the wing tank outer cell is moved to the related inner cell by gravity when the related intercell transfer valve/s is/are open. The operation of the intercell transfer valves is controlled automatically by the Fuel Level Sensing Control Unit (FLSCU) (Ref. AMM D/O 28-46-00-00) and the Fuel Quantity Indicating Computer (FQIC) (Ref. AMM D/O 28-42-00-00).
The Engine/Warning Display (E/WD) (Ref. AMM D/O 31-66-00-00) and the System Display (SD) (Ref. AMM D/O 31-67-00-00), (the Electronic Centralized Aircraft Monitoring (ECAM) display units), show intercell transfer system information to the crew.
If specified failures occur:

a warning is given on the EWD
the FUEL page is shown on the SD.

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2. Component Location

Intercell Transfer System - Component Location ** ON A/C NOT FOR ALL

FIN	FUNCTIONAL DESIGNATION	PANEL	ZONE	ATA REF
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27QM	VALVE-TRANSFER, L FWD SPAR	540KB	540	28-15-41
28QM	VALVE-TRANSFER, L REAR SPAR	540JB	540	28-15-41
29QM	VALVE-TRANSFER, R FWD SPAR	640KB	640	28-15-41
30QM	VALVE-TRANSFER, R REAR SPAR	640JB	640	28-15-41
70QM	DRIVE SHAFT-TRANSFER VALVE, L FWD SPAR	540AZ	540	28-15-42
71QM	DRIVE SHAFT-TRANSFER VALVE, L REAR SPAR	540BZ	540	28-15-42
72QM	DRIVE SHAFT-TRANSFER VALVE, R FWD SPAR	640AZ	640	28-15-42
73QM	DRIVE SHAFT-TRANSFER VALVE, R REAR SPAR	640BZ	640	28-15-42
76QM	V BAND CLAMP-TRANSFER ACTR, L FWD SPAR	521AZ	520	28-10-00
77QM	V BAND CLAMP-TRANSFER ACTR, R FWD SPAR	621AZ	620	28-10-00
78QM	V BAND CLAMP-TRANSFER ACTR, L REAR SPAR	571AB	570	28-10-00
79QM	V BAND CLAMP-TRANSFER ACTR, R REAR SPAR	671AB	670	28-10-00
9QP	ACTUATOR-TRANSFER VALVE, L FWD SPAR		520	28-15-51
10QP	ACTUATOR-TRANSFER VALVE, R FWD SPAR		620	28-15-51
11QP	ACTUATOR-TRANSFER VALVE, L REAR SPAR		570	28-15-51
12QP	ACTUATOR-TRANSFER VALVE, R REAR SPAR		670	28-15-51

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3. System Description

Intercell Transfer System - Location and Detail ** ON A/C NOT FOR ALL

The intercell transfer system has:

two intercell transfer valves 27QM(29QM), 28QM(30QM)
two intercell-transfer-valve actuators 9QP(10QP), 11QP(12QP)
two intercell-transfer-valve drive shafts 70QM(72QM), 71QM(73QM).

The intercell transfer valve 27QM(29QM) is on the outboard side of RIB 15 near to the bottom of the rib and the wing front spar.
The intercell transfer valve 28QM(30QM) is on the inboard side of RIB 15 near to the bottom of the rib and the wing rear spar.
The intercell-transfer-valve actuator 9QP(10QP) is on the front face of the wing front spar. The intercell-transfer-valve actuator 11QP(12QP) is on the rear face of the wing rear spar. Thus the actuators can be replaced without access to the related fuel tank.
The actuators are connected to their related intercell transfer valve by the intercell-transfer-valve drive shaft 70QM(72QM) and 71QM(73QM). The actuators are attached to their related drive shaft by the V-band clamps 76QM(77QM) and 78QM(79QM).
The intercell transfer system is controlled automatically by the FLSS and the FQIC. When one of the two low level sensors 15QJ1/16QJ2 (Ref. AMM D/O 28-46-00-00) becomes dry, the FLSCU1/2 will send an open signal to the two actuators 9QP and 10QP. When one of the two low level sensors 16QJ1/15QJ2 (Ref. AMM D/O 28-46-00-00) becomes dry, the FLSCU1/2 will send an open signal to the two actuators 11QP and 12QP.
When open the intercell transfer valves stay latched open until the next refuel operation. At the start of a refuel operation the intercell transfer valve actuators are de-latched by the FQIC.
During a refuel using battery power, the intercell transfer valves are not energized and will not operate. If the intercell valves are in the open position, they will not close and it is not possible to refuel to maximum capacity.
During a refuel using APU or External power the intercell transfer valves are energized and it is possible to refuel to maximum capacity.
Intercell transfer valve position information is sent to the Display Management Computer (DMC) (Ref. AMM D/O 31-62-00-00) by the FQIC. The DMC sends intercell transfer system and valve position data to the ECAM. The intercell transfer valve position is shown on the SD FUEL page.
If specified failures occur:

a warning is shown on the EWD
the Flight Warning Computer (FWC) (Ref. AMM D/O 31-60-00-00) operates the audible warning and causes the MASTER CAUT light to come on.

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4. Power supplies

Intercell Transfer System - Electrical Schematic ** ON A/C NOT FOR ALL

** ON A/C NOT FOR ALL

5. Interfaces

Intercell Transfer System - Interfaces ** ON A/C NOT FOR ALL

** ON A/C NOT FOR ALL

6. Component Description

Intercell Transfer Valve - Detail ** ON A/C NOT FOR ALL

A. Intercell transfer valve FIN: 27-QM FIN: 28-QM FIN: 29-QM FIN: 30-QM
The intercell transfer valve has:

a housing
a ball valve
a valve spindle
two end retainers.

The ball valve is in the housing and is kept in position by the two end retainers. One of the end retainers has four threaded holes for installation to the RIB 15. The ball valve has a master key-way that engages the valve spindle, and a 38.1 mm (1.5 in.) hole to allow fuel through when open.
The valve spindle has splines at one end for installation of the related drive shaft 70QM(72QM) and 71QM(73QM).

B. Intercell-transfer-valve drive shaft 70QM(72QM), 71QM(73QM)
The intercell-transfer-valve drive shaft has:

a drive shaft
a mounting plate
an actuator mounting
a bearing.

The drive shaft is in three pieces that are connected by two universal joints. The universal joints permit lateral movement of the drive shaft in its installed position.
One end of the drive shaft has internal splines that engage the splines of the valve spindle of the of the intercell transfer valve. The other end of the drive shaft has a master key-way to engage the intercell-transfer-valve actuator.
The mounting plate is on the drive shaft and attaches to the inner face of the related fuel tank. The actuator mounting is also on the drive shaft, but attaches to the outer face of the related fuel tank. The mounting plate and the actuator mounting are connected through the tank wall by studs and nuts. The actuator mounting has a flange for installation of the intercell-transfer-valve actuator 9QP(10QP), 11QP(12QP).

C. Intercell-transfer-valve actuator 9QP(10QP), 11QP(12QP)
The intercell-transfer-valve actuator has an electrical motor that drives a differential gear. The differential gear engages a drive spindle that has a master key-way to engage the intercell-transfer-valve drive shaft. One operation of the electrical motor will turn the ball valve through 90 deg. to open and close the valve. Limit switches in the actuator control this 90 deg. movement and set the electrical circuit for the next operation.
A V-band clamp 76QM(77QM), 78QM(79QM) attaches the actuator to the flange of the actuator mounting of the drive shaft. A location dowel makes sure that the actuator engages the actuator mounting correctly.
The actuator has a see/feel indicator. The indicator gives the valve position, without removal of the actuator or entry to the fuel tank.

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7. Operation/Control and Indicating

SD FUEL Page Intercell Transfer Valve Position Data ** ON A/C NOT FOR ALL

Intercell Transfer System - Interfaces ** ON A/C NOT FOR ALL

A. Operation/control
The intercell transfer system is operated and controlled automatically by the FQIC and the FLSS. To operate the system it is necessary to have:

the 28VDC BUS 2 206PP and the 28VDC ESS SHED BUS 801PP energized
the circuit breakers 1QP, 2QP, 3QP, 4QP, 1QT and 2QT closed.

At the start of a normal refuel procedure (Ref. AMM D/O 28-25-00-00) the four intercell transfer valves will be open. When the two low level sensors 15QJ1/16QJ2 (Ref. AMM D/O 28-46-00-00) become wet, the FLSS will send a close signal to the two actuators 9QP and 10QP. When the two low level sensors 16QJ1/15QJ2 (Ref. AMM D/O 28-46-00-00) become wet, the FLSS will send a close signal to the two actuators 11QP and 12QP. The wing tanks are then refueled in the sequence; outer cells first followed by the inner cells.
During flight, the main fuel pumps (Ref. AMM D/O 28-21-00-00) supply the fuel from the inner cells to the engines. When one of the two low level sensors 15QJ1/16QJ2 (Ref. AMM D/O 28-46-00-00) becomes dry, the FLSS will send an open signal to the two actuators 9QP and 10QP. When one of the two low level sensors 16QJ1/15QJ2 (Ref. AMM D/O 28-46-00-00) becomes dry, the FLSS will send an open signal to the two actuators 11QP and 12QP.
When open, the intercell transfer valves will stay open until the next refuel operation, when they will be allowed to close by a signal from the FQIC.
During a refuel using battery power, the intercell transfer valves are not energized and will not operate. If the intercell transfer valves are in the open position, they will not close and it is not possible to refuel to maximum capacity.
During a refuel using APU or External power the intercell transfer valves are energized and it is possible to refuel to maximum capacity.

B. Indication
The position of the intercell transfer valves is shown on the ECAM SD FUEL page.
If specified failures occur (a valve fails open or both the valves in a wing fail closed) in the intercell transfer system:

the ECAM SD FUEL page is shown
a warning is shown on the ECAM EWD
an audible warning occurs in the cockpit
the MASTER CAUT light, on the cockpit glareshield panel, comes on.

If the two intercell transfer valves in a wing tank fail to open when commanded:

the Fuel Quantity Indication (FQI) (Ref. AMM D/O 28-42-00-00) for the related outer cell goes amber in color
the FQI for the related outer cell is shown boxed. This is to indicate that the outer cell fuel is not available
the Fuel On Board (FOB) FQI on the SD FUEL page is shown amber and boxed. This is to indicate that the FOB is not fully usable.
the FOB FQI on the ECAM EWD is shown amber and half boxed. This is to indicate that the FOB is not fully usable.

** ON A/C NOT FOR ALL

8. Test
The intercell transfer valves are tested during the FLSCU BITE test (Ref. AMM D/O 28-46-00-00). The test results are shown (on the ground) on the Multi-purpose Control and Display Units (MCDUs) (Ref. AMM D/O 22-82-00-00).

[Rev.10 from 2021] 2026.04.02 07:01:09 UTC