-
the 28VDC BUS 2 supplies the motor 2.
If damage occurs to the electrical circuit, it is necessary to make sure that the valve can still operate. Thus the electrical supply to each motor goes through a different routing. The routing for motor 1 is along the front spar. The routing for motor 2 is along the rear spar and then forward through the flap track fairing at RIB6.
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LP Fuel Shut-Off - Component Location and Detail
Figure 001
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The actuators send position data to the System Data-Aquisition Concentrators (SDAC1 and SDAC2) (Ref. 31-54-00). The SDACs process the data and send it to the ECAM which shows the information on the FUEL page.
4. Power Supply____________ (Ref. Fig. 002)
5. Interface_________ (Ref. Fig. 003)
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LP Fuel-Valve - Electrical Schematic
Figure 002
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Engine LP Fuel Shut-Off - Interfaces
Figure 003
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6. Component Description_____________________
R A. LP Fuel Valve 12QM(13QM) (Ref. Fig. 001)
The LP fuel-valve has:
R - a valve body - a ball valve with a thermal relief valve
- a valve spindle - a mounting flange.
R R R R R R R R The valve body contains the ball-valve which has a bore of 38.1 mm (1.5 in). The ball valve is connected to the LP valve actuator by the valve spindle. A location slot makes sure that the valve spindle engages correctly with the actuator. The thermal relief valve is installed in the ball valve. When the LP valve is closed, the thermal relief valve operates at 0.83 bar (12 psi) to 1.52 bar (22 psi) to release downstream fuel-pressure (caused through thermal expansion) back through the valve. The LP valve is installed on the front-face of the wing front spar by the mounting flange.
B. LP Fuel Valve Actuator 9QG(10QG)
(Ref. Fig. 001) The LP fuel-valve actuator has two electrical motors which drive the same
differential-gear to turn the ball valve through 90 deg. The 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 or close the valve if the other motor does not operate. The actuator drive shaft has a see/feel indicator where it goes through the actuator body. The see/feel indicator gives an indication of the valve position without removal of the LP fuel-valve.
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7. Operation/Control and Indicating
________________________________
The engine LP fuel shut-off system is controlled manually. For the system to operate it is necessary to:
-
energize the 28VDC ESS BUS 1 (401PP)
-
energize the 28VDC BUS 2 (206PP)
-close the circuit breakers 1QG, 2QG, 3QG and 4QG.
There is one LP fuel-valve for each engine, and each engine has an equivalent circuit. Thus as each LP fuel-valve circuit is the same, only the operation of the No. 1 engine circuit is given here.
A. Operation
(Ref. Fig. 002, 004)
When the No. 1 ENG MASTER switch (Ref. 76-12-00) is set to ON, it
disconnects a 28VDC supply from the relay 11QG (HP FUEL SOV SOL P/BSW).
The relay 11QG de-energizes and connects a 28VDC supply (through the ENG
1 FIRE PUSH switch (Ref. 26-12-00)) to the 'open' side of the LP
fuel-valve actuator. The actuator then opens the LP fuel-valve.
When the No. 1 ENG MASTER switch is set to OFF, it connects a 28VDC
supply to the relay 11QG. The relay energizes and connects a 28VDC supply
(through the ENG 1 FIRE PUSH switch) to the 'close' side LP fuel-valve
actuator. The actuator then closes the LP fuel-valve.
If the ENG 1 FIRE PUSH switch is operated:
-
it disconnects the 28VDC supply to the 'open' side of the LP fuel-valve actuator
-
it connects a 28VDC supply to the 'close' side of the LP fuel valve actuator - the LP fuel-valve moves to the closed position.
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