DOC AIRBUS | AMM A320FCROSSFEED SYSTEM - DESCRIPTION AND OPERATION
** ON A/C NOT FOR ALL
** ON A/C NOT FOR ALL
** ON A/C NOT FOR ALL
** ON A/C NOT FOR ALL
1. General
The valve of the crossfeed system is usually closed, and in this configuration it divides the main fuel pump system (Ref. AMM D/O 28-21-00-00) into two parts (one part for each engine). When the crossfeed valve is open, the two fuel supplies are connected together. Thus the two engines can be supplied with fuel from one of the wing tanks or from the two wing tanks.
The crossfeed system is operated manually by the X FEED pushbutton switch 4QE. The X FEED pushbutton switch is installed in the cockpit on the fuel control panel 40VU.
The Engine/Warning Display (EWD) (Ref. AMM D/O 31-66-00-00) and the System Display (SD) (which together make the ECAM) give crossfeed system information to the crew. If specified failures occur:
** ON A/C NOT FOR ALL The valve of the crossfeed system is usually closed, and in this configuration it divides the main fuel pump system (Ref. AMM D/O 28-21-00-00) into two parts (one part for each engine). When the crossfeed valve is open, the two fuel supplies are connected together. Thus the two engines can be supplied with fuel from one of the wing tanks or from the two wing tanks.
The crossfeed system is operated manually by the X FEED pushbutton switch 4QE. The X FEED pushbutton switch is installed in the cockpit on the fuel control panel 40VU.
The Engine/Warning Display (EWD) (Ref. AMM D/O 31-66-00-00) and the System Display (SD) (which together make the ECAM) give crossfeed system information to the crew. If specified failures occur:
- a warning is given on the EWD
- the FUEL page shows on the SD.
2. Component Location
Crossfeed System - Component Location ** ON A/C NOT FOR ALL
Crossfeed System - Component Location ** ON A/C NOT FOR ALL
** ON A/C NOT FOR ALL Crossfeed System - Component Location ** ON A/C NOT FOR ALL Crossfeed System - Component Location ** ON A/C NOT FOR ALL | FIN | FUNCTIONAL DESIGNATION | PANEL | ZONE | ACCESS DOOR | ATA REF |
|---|---|---|---|---|---|
| ** ON A/C ALL | |||||
| 5QE | ACTUATOR-FUEL CROSSFEED VALVE | 148 | 28-23-51 | ||
| 10QM | VALVE-FUEL CROSSFEED | 148 | 28-23-41 | ||
| 83QM | V BAND CLAMP-CROSSFEED VALVE ACTR | 148 | 28-10-00 | ||
3. System Description
The crossfeed system has:
The actuator is attached with a V-band clamp 83QM to the crossfeed valve drive-assembly (on the rear face of the rear spar). The interface between the actuator and the crossfeed valve is a valve spindle that goes through the rear spar. The actuator has two motors, which get their power supply from two different sources:
The crossfeed valve actuator has a control and indication circuit. The indication circuit has a X FEED pushbutton switch (P/BSW) on the cockpit fuel panel 40VU. The indication circuit interfaces with the two System Data-Aquisition Concentrators (SDAC1/SDAC2) (Ref. AMM D/O 31-54-00-00).
The P/BSWs and the actuators send data to the SDACs. The SDAC units send the data to the ECAM. The ECAM shows the position of the crossfeed valves on the SD FUEL page. If there is a failure of a crossfeed valve, the EWD (Ref. AMM D/O 31-66-00-00) shows the message X FEED VALVE FAULT.
There are two indicator lights in the P/BSW (ON and OPEN). These lights are included in the annunciator-light test and dimming (Ref. AMM D/O 33-14-00-00).
** ON A/C NOT FOR ALL The crossfeed system has:
- a crossfeed valve actuator 5QE
- a crossfeed valve 10QM
- a V-band clamp 83QM.
The crossfeed valve 10QM is installed in the fuel pipe in the center tank. This fuel pipe connects the fuel supply pipes of the left wing to the fuel supply pipes of the right wing. When the crossfeed valve is open the fuel supply pipes are connected. In this configuration, the fuel can be supplied to the engines from either wing tank.
The crossfeed valve is installed on the forward-face of the rear spar.
The actuator is attached with a V-band clamp 83QM to the crossfeed valve drive-assembly (on the rear face of the rear spar). The interface between the actuator and the crossfeed valve is a valve spindle that goes through the rear spar. The actuator has two motors, which get their power supply from two different sources:
- motor 1, the 28VDC ESS BUS (801PP)
- motor 2, the 28VDC BUS 2 (206PP).
The crossfeed valve actuator has a control and indication circuit. The indication circuit has a X FEED pushbutton switch (P/BSW) on the cockpit fuel panel 40VU. The indication circuit interfaces with the two System Data-Aquisition Concentrators (SDAC1/SDAC2) (Ref. AMM D/O 31-54-00-00).
The P/BSWs and the actuators send data to the SDACs. The SDAC units send the data to the ECAM. The ECAM shows the position of the crossfeed valves on the SD FUEL page. If there is a failure of a crossfeed valve, the EWD (Ref. AMM D/O 31-66-00-00) shows the message X FEED VALVE FAULT.
There are two indicator lights in the P/BSW (ON and OPEN). These lights are included in the annunciator-light test and dimming (Ref. AMM D/O 33-14-00-00).
** ON A/C NOT FOR ALL
** ON A/C NOT FOR ALL
A. Crossfeed Valve FIN: 10-QM
The primary components of the crossfeed valve are:
The crossfeed valve body holds the ball valve which has a bore of 38.1 mm (1.5 in). The ball valve has a master key-way that engages with the valve spindle. The valve spindle also has a master key-way that engages with the drive assembly.
The mounting flange of the crossfeed valve body is attached to the forward face of the rear spar with four studs and two countersunk bolts. The studs also attach the drive assembly to the rear face of the rear spar. The drive assembly has a flange to which the actuator is attached and a location slot to make sure the actuator engages correctly. A set of O-ring seals prevent a leakage of fuel through the mounting flange.
The primary components of the crossfeed valve are:
- the valve body with a mounting flange
- the ball valve with its valve spindle
- the drive assembly.
The crossfeed valve body holds the ball valve which has a bore of 38.1 mm (1.5 in). The ball valve has a master key-way that engages with the valve spindle. The valve spindle also has a master key-way that engages with the drive assembly.
The mounting flange of the crossfeed valve body is attached to the forward face of the rear spar with four studs and two countersunk bolts. The studs also attach the drive assembly to the rear face of the rear spar. The drive assembly has a flange to which the actuator is attached and a location slot to make sure the actuator engages correctly. A set of O-ring seals prevent a leakage of fuel through the mounting flange.
B. Crossfeed Valve Actuator 5QE
The crossfeed valve actuator has two electrical motors which drive the same differential gear to turn the ball valve through 90 deg. Limit switches in the actuator control this 90 deg. movement and set the electrical circuit for the next operation. One of the two motors can open/close the valve if the other motor does not operate. A V-band clamp (83QM) attaches the actuator to the flange of the drive assembly. A location peg makes sure the actuator engages correctly.
The crossfeed valve actuator has two electrical motors which drive the same differential gear to turn the ball valve through 90 deg. Limit switches in the actuator control this 90 deg. movement and set the electrical circuit for the next operation. One of the two motors can open/close the valve if the other motor does not operate. A V-band clamp (83QM) attaches the actuator to the flange of the drive assembly. A location peg makes sure the actuator engages correctly.
A. Operation/Control
The crossfeed valve is controlled manually. To operate it is necessary to have:
When the same P/BSW is released (out):
The crossfeed valve is controlled manually. To operate it is necessary to have:
- the 28VDC BUS 2 206PP and the 28VDC ESS.SHED. BUS 801PP energized
- the circuit breakers 1QE and 2QE closed.
- the 28VDC supply energizes the two electrical motors of the actuator
- the crossfeed valve turns to the open position
- the crossfeed valve signals its position to the ECAM FUEL page display.
When the same P/BSW is released (out):
- the 28VDC supply energizes the two electrical-motors of the actuator
- the crossfeed valve turns to the closed position
- the crossfeed valve signals its position to the ECAM FUEL page display.
B. Indicating
Crossfeed Valve - ECAM Display ** ON A/C NOT FOR ALL
Crossfeed Valve - ECAM Display ** ON A/C NOT FOR ALL
Crossfeed Valve - ECAM Display ** ON A/C NOT FOR ALL
Crossfeed Valve - ECAM Display ** ON A/C NOT FOR ALL
Crossfeed System - ECAM Display ** ON A/C NOT FOR ALL
Crossfeed System - ECAM Display ** ON A/C NOT FOR ALL
Crossfeed Valve - ECAM Display ** ON A/C NOT FOR ALL
Crossfeed System - ECAM Display ** ON A/C NOT FOR ALL
The crossfeed valve position is shown on the FUEL page of the ECAM System Display. If a failure occurs in the fuel system the FUEL page is shown on the ECAM System Display. If you want to look at the ECAM FUEL page you must push the FUEL push-button switch on the ECAM control panel.
System Failures
If the crossfeed valve is not in the set position:
Crossfeed Valve - ECAM Display ** ON A/C NOT FOR ALL Crossfeed Valve - ECAM Display ** ON A/C NOT FOR ALL Crossfeed Valve - ECAM Display ** ON A/C NOT FOR ALL Crossfeed Valve - ECAM Display ** ON A/C NOT FOR ALL Crossfeed System - ECAM Display ** ON A/C NOT FOR ALL Crossfeed System - ECAM Display ** ON A/C NOT FOR ALL Crossfeed Valve - ECAM Display ** ON A/C NOT FOR ALL Crossfeed System - ECAM Display ** ON A/C NOT FOR ALL System Failures
If the crossfeed valve is not in the set position:
- the message FUEL X FEED VALVE FAULT is shown on the ECAM Engine/Warning Display Page
- the crossfeed valve indication is shown amber on the ECAM SD FUEL page.