(7)
Each solenoid valve is installed as near as possible to its associated spray nozzle to limit:
-the response time of the system,
-loss of fluid between the valve and the nozzle,
-the risks of internal clogging due to the evaporation of the residual fluid.
(8)
Each spray nozzle protrudes from the skin panel of the aircraft and incorporates four directional orifices with calibrated diameters. The two nozzles are arranged symmetrically and are not interchangeable ; precise angular positioning is required.
(9)
The purge system is provided to eliminate the fluid remaining between the check valve and the nozzle after each application of the fluid. The hot air manifold of the air conditioning system supplies the purge air at a pressure of 4 plus or minus 1 PSID with reference to the cabin pressure. The assembly comprising the check valves and the rain-repellent blowout reservoir:
-enables air to flow permanently to the spray nozzles when the rain-repellent system does not operate,
-shuts off the air supply lines during spraying of the
rain-repellent fluid.
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(10) The system is inhibited on the ground (connection to the Engine Vibration Monitoring Unit (EVMU)).
4. Power Supply
____________
(Ref. Fig. 008)
Power supply to and protection of the equipment and the function are
provided as follows:
------------------------------------------------------------------------------|EQUIPMENT - FUNCTION CIRCUIT BREAKERS BUSBARS | |----------------------------------------------------------------------------| |CAPT Wiper Motor Converter 4DB1 101PP | |----------------------------------------------------------------------------| |F/O Wiper Motor Converter 4DB2 202PP | ------------------------------------------------------------------------------
(Ref. Fig. 009)
The supply and protection of the solenoid valves is as follows:
------------------------------------------------------------------------------|COMPONENT - FUNCTION CIRCUIT BREAKERS BUSBARS | |----------------------------------------------------------------------------| |CAPT rain-repellent solenoid 1DB1 101PP | |valve | |----------------------------------------------------------------------------| |F/O rain-repellent solenoid 1DB2 202PP | |valve | ------------------------------------------------------------------------------
5.
Interfaces
__________ The rain-repellent system is connected to the Engine Interface Vibration Monitoring Unit (EIVMU) system; this ensures inhibition of the rain-repellent system on the ground, with engines shut down.
6.
Component Description
_____________________
A. Wiper System
(1) Motor converter
(Ref. Fig. 010)
(a)
The motor and converter form a single assembly.
(b)
The motor is provided with a thermal protection which protects the mechanical and electrical components of the system.
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R Wiper System - Schematic Figure 008
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R Rain Repellent System-Schematic Figure 009
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Wiper Motor Converter Figure 010
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(c) The motor converter assembly provides the sweeping angles defined on the referenced figure, via the wiper arm/blade assembly (Ref. Fig. 011) The motor converter serves to obtain the parking position of the wiper arm when the WIPER control switch is placed in the OFF position. The converter changes the rotary motion of the motor into an oscillatory motion of the wiper arm (alternate sweeping). The motor leading particulars are:
-direct current,
-permanent magnet,
-two rotation speeds (slow/fast) for sweeping,
- one slow speed, inverted rotation, for the parking position.
It is possible, even on aircraft, to replace the motor from the
assembly without mechanical damage to the motor/converter
junction.
(2)
CAPT and F/O wiper arms Each rigid arm serves to adjust the parking position angle (lower position) to plus or minus 1 deg. by the use of a splined bushing between the converter output shaft and the arm. The arm/blade junction is rigid enough to maintain the blade/arm angle constant in all the utilization cases. The pressure of the arm on the windshield is adjustable, (Ref. Fig. 012) A roller device allows the adjustment of the arms on the rest blocks. (Ref. Fig. 005) The arm is coated with a dull-black anti-reflective paint.
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