-drive the valve to the fully open position.
It is possible to manually override and lock the valve in either the open or
closed position. Without application of motive pressure, it is possible to
move the valve to the desired position by application of a torque of not
more than 200 lbf.in. to a standard hexagonal nut attached to the butterfly
shaft.
R Anti Ice Valve of the Engine Air Intake - General View R Figure 007
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Anti Ice Valve of the Engine Air Intake - Schematic
Figure 008
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Anti Ice Access Panel
Figure 009
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R Insertion of the locking pin through the locking hole on the valve body into
R the mating hole in the piston locks the valve. A ball detent mechanism in
R the end of the locking pin retains the pin in the hole corresponding to the
R desired valve position.
R A visual position indicator shows the position of the valve.
R Two hermetically sealed switches actuated by a cam give the electrical
R position indication.
R The cam is splined to the shaft of the actuator. The switches are capable of
R operation in a high temperature environment. The switches are configured to
R give a disagrement indication signal if the valve is not in the commanded
R position.
R
7. Operation/Control and Indicating________________________________
R A. General
R The air bled from the fifth stage of the compressor passes through four
R duct sections and a line-mounted valve of the on-off type. At the forward
R bulkhead of the intake cowl, the anti ice system interfaces with the
R swirl nozzle in the intake lip. The spent air then enters the cavity of
R the intake cowl aft of the forward bulkhead: the air passes through holes
R in the inner cap of the bulkhead between the skin inner barrel and the
R bulkhead.
R Finally, the air exhausts overboard through the flush duct in the outer
R barrel.
R The airflow pressure is controlled by an anti ice valve which is of the
R butterfly type and electrically operated. The safety position of the
R valve is full open.
R Q = airflow (kg/s).
R When the anti ice valve is open, the information is fed to the zone
R controller. The latter determines the configuration of the engine bleed
R air to control the FADEC: this decreases the N1 limit relative to the
R ambient conditions, the engine operating conditions and the load of the
R anti ice bleed.
B. Control and Indicating
(Ref. Fig. 003, 004, 010, 011)
The control and indicating components are located on the overhead panel,
on the ANTI ICE section of panel 25VU. Two pushbutton switches designated
ENG 1 and ENG 2 are available, each associated with one engine.
Each pushbutton switch includes two luminous legends:
- ON: blue,
- FAULT: amber.
Anti Ice Valve of the Engine Air Intake Not Closed
Figure 010
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Anti Ice Valve of the Engine Air Intake Not Open
Figure 011
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(1)
When you release the pushbutton switch, the ON legend is off and the system is not selected on.
(2)
When you push the pushbutton switch, the ON legend is on and the system is selected on.
(3)
Illumination of the FAULT legend indicates:
