R **ON A/C 005-049, 057-099, 101-149, 151-199, 201-299, 301-399, 401-499,
(Ref. Fig. 002)
-------------------------------------------------------------------------------FIN | FUNCTIONAL DESIGNATION | PANEL|ZONE|ACCESS | ATA | | | | DOOR | REF.
-------------------------------------------------------------------------------3QF ACTUATOR-APU FUEL LP VALVE 147 734 28-29-51 14QM VALVE-APU FUEL LP 141 315AL 28-29-41
**ON A/C ALL
3. System Description
__________________
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APU LP Fuel Shut-Off Valve
Figure 001
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1 1 Feb 01/98
1 1
1CES 1
INTENTIONALLY BLANK
1 1
28-29-00Page 3
1 1 Feb 01/98 1 1 1CES 1
R APU LP Fuel Shut-Off Valve - Component Location Figure 002 (SHEET 1)
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R APU LP Fuel Shut-Off Valve - Component Location Figure 002 (SHEET 2)
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R APU LP Fuel Shut-Off Valve - Component Location Figure 002 (SHEET 3)
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**ON A/C 001-004, 051-056,
(Ref. Fig. 002) The APU LP fuel shutoff system has a fuel LP valve 14QM and a related fuel LP valve actuator 3QF. The valve and the actuator are installed on the rear spar of the wing center-box. The valve 14QM is installed in the APU fuel-supply line, where it joins the adjacent engine-feed line. The valve isolates the APU fuel-supply line from the engine fuel-feed line. The electrical circuit of the valve is linked to these circuits which control the valve operation:
-
APU fuel pump circuit (Ref. 28-22-00),
-
APU emergency shutdown circuit (Ref. 49-62-00),
-
APU engine fuel and control circuit (Ref. 49-30-00),
-
APU fire extinguishing circuit (Ref. 26-22-00).
The valve closes automatically, when the APU SHUT-OFF pushbutton 1KL or the
APU FIRE pushbutton 1WD is operated. The valve also closes with an APU
shutdown on the ground after a fire detection.
R **ON A/C 005-049, 057-099, 101-149, 151-199, 201-299, 301-399, 401-499,
The APU LP fuel shutoff system has a fuel LP valve 14QM, an adaptor 5020QM and a related fuel LP valve actuator 3QF. The actuator is installed on the adaptor 5020QM. The valve and the adaptor are installed on the rear spar of the wing center-box. The valve 14QM is installed in the APU fuel-supply line, where it joins the adjacent engine-feed line. The valve isolates the APU fuel-supply line from the engine fuel-feed line. The electrical circuit of the valve is linked to these circuits which control the valve operation:
-
APU fuel pump circuit (Ref. 28-22-00),
-
APU emergency shutdown circuit (Ref. 49-62-00),
-
APU engine fuel and control circuit (Ref. 49-30-00),
-
APU fire extinguishing circuit (Ref. 26-22-00).
The valve closes automatically, when the APU SHUT-OFF pushbutton 1KL or the
APU FIRE pushbutton 1WD is operated. The valve also closes with an APU
shutdown on the ground after a fire detection.
**ON A/C ALL
4. Power Supply
____________
(Ref. Fig. 003)
The two DC motors in the actuator 3QF, which move the valve 14QM, are
supplied from different sources. One motor is supplied with 28VDC from the
normal busbar 301PP. The other motor is supplied with 28VDC from the hot
bat. busbar 701PP.
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APU LP Fuel Shut-Off Valve - Electrical Schematic. Figure 003
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5. Interfaces__________
R (Ref. Fig. 004)
R The APU LP fuel shutoff system has interfaces with:
R - APU fuel-pump system (Ref. 28-22-00),
R - APU emergency-shutdown system (Ref. 49-62-00),
R - APU fire-extinguishing system (Ref. 26-22-00),
R - APU fuel distribution system (Ref. 49-31-00),
R - Electronic Centralized Aircraft Monitoring (ECAM) system (Ref. 31-51-00).
6. Component Description_____________________
(Ref. Fig. 005)
A. APU Fuel LP Valve
The APU fuel LP valve has a ball valve assembly (14QM) and an actuator
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