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 assembly (3QF). You can remove the actuator, with the valve in position,
 without the necessity to drain the system. The ball valve assembly (14QM)
 is attached with four bolts in self-locking inserts to the rear spar of
 the wing center-box. Four studs in the valve, which come through holes in
 the rear spar, are used to attach the actuator (3QF). The valve is a body
 with pipeline attachments. The fuel inlet connector is a threaded-type
 connection. The fuel outlet-port has four studs for installation of the
 fuel outlet tube. The valve body includes a ball with 0.5 in. (12.7 mm)
 dia. bore and a drive-shaft for the includes a ball with 0.5 in. (12.7
 mm) dia. bore and a drive-shaft for the Polytetrafluorethylene (PTFE)
 valve seat. An integrated spring loaded poppet-valve allows thermal
 pressure relief in the opposite direction to normal flow when the valve
 is closed. The drive slot on top of the ball lets the ball move in direct
 relation to the drive shaft.
 B. Actuator Assembly
 The actuator assembly (3QF) has two electrical DC motors which drive
 together. The two motors drive a common planetary gear system, with the
 drive-shaft through clutches, to operate the valve. The gear system
 permits one motor to drive the valve if the other motor does not operate.
 Two groups of three microswitches activate the related 'OPEN' or 'CLOSED'
 circuit for operation of the valve. They are located at the bottom of the
 actuator. The microswitches are operated with levers, which are tipped
 with a cam on the actuator drive-shaft. A window in the actuator body
 gives a visual indication of the valve, RED for 'OPEN' or GREEN for
 'CLOSED' position.

 1EFF : ALL 1 28-29-00Page 9 1 1 May 01/04 1 1 1CES 1

 APU LP Fuel Shut-Off Valve System - Block Diagram Figure 004
 1EFF : 1 1R 1CES  ALL  1 11 1 28-29-00 Page 10 Feb 01/99

 

 APU LP Fuel Shut-Off Valve Figure 005
 1EFF : 1 1R 1CES  ALL  1 11 1 28-29-00 Page 11 Feb 01/99

 

 7. Operation/Control and Indication
________________________________
 (Ref. Fig. 003)

 **ON A/C 001-049, 051-099, 101-105, 151-199, 201-299,
 (Ref. Fig. 006)

R **ON A/C 106-149, 401-499,
 (Ref. Fig. 006A)
 **ON A/C 301-302,
 (Ref. Fig. 006B)
 **ON A/C 303-399,
 (Ref. Fig. 006C)
 **ON A/C ALL
 A. Normal Operation
 (1)
 The APU Fuel Supply When the APU MASTER SW is set to on, the ECB energizes the APU MAIN RELAY 4KD. It energizes the APU fuel LP valve-actuator 3QF and the APU fuel LP valve 14QM opens. Then the engine pump or APU fuel pump supply the necessary fuel from the engine feed line to the APU fuel distribution system.

 (2)
 APU Shutdown When the APU shuts down, the ECB de-energizes the APU MAIN RELAY 4KD. It de-energizes the APU fuel LP valve-actuator 3QF and the APU fuel LP valve 14QM closes. The APU MAIN RELAY 4KD de-energizes the APU fuel feed pump 4QC if it was in operation.

 (3)
 APU Fuel-Feed Pump Operation for Ground Maintenance The vent APU fuel line pushbutton switch 8QC permits the APU fuel-feed pump 4QC to operate on the ground (to purge the APU fuel-feed line during ground maintenance). When you operate the VENT APU FUEL LINE pushbutton switch 8QC:

 -the APU fuel line vent relay 6QC energizes,
 1EFF : ALL 1 28-29-00Page 12 1 1 Aug 01/05 1 1 1CES 1

 ECAM Location and Typical Displays
 Figure 006

R 1EFF : 001-049, 051-099, 101-105, 151-199, 1 28-29-00Page 13 1201-299, 1May 01/05 1 1 1CES 1

 ECAM Location and Typical Displays
 Figure 006A

R 1EFF : 106-149, 401-499, 1 28-29-00Page 14 1 1 Aug 01/05 1 1 1CES 1

 ECAM Location and Typical Displays 
R  Figure 006B 
R 1EFF :  301-302,  1  28-29-00 Page 15 
1  1  May 01/05
 1  1
 1CES  1

 

 ECAM Location and Typical Displays 
R  Figure 006C 
R 1EFF :  303-399,  1  28-29-00 Page 16 
1  1  May 01/05
 1  1
 1CES  1

 

 -
the actuator fuel LP valve 3QF energizes and opens the APU fuel LP valve 14QM,

 -
the ESSENTIAL AC BUS 1 401XP supplies 115VAC single-phase to

 operate the motor of the APU fuel-feed pump 4QC. The pump will continue to operate and the valve will stay open as long as the pushbutton is pushed. When the pushbutton is released the pump will stop and the valve will close.
　
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