(3)
Blade
-The form of the blade is designed to ensure even sweeping of the windshield in all the utilization conditions; the tolerances of the blade pressure adjustment must be observed, (Ref. Para (6)(a)).
-It is possible to replace the blade without removing the arm.
-When the wiper system is in operation, the blade should in no case overlap onto the metal frame of the windshield.
(4)
Control switch The WIPER control switch located on the overhead panel (panels 21VU and 22VU) incorporates a quick-break device which enables electrical switching in the following positions:
-OFF: parking and stop position,
-SLOW: slow speed,
-FAST: fast speed.
1EFF : ALL 1 30-45-00Page 17 1 1 May 01/05R 1 1 1CES 1
R Wiper System - Sweeping Area Figure 011
1EFF : 1 1 1CES ALL 1 111 30-45-00 Page 18 May 01/99
Adjustment of the Pressure of the Arm on the Windshield R Figure 012
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(5)
Parking position and liftoff device When the wiper system is selected OFF, the arm/blade assembly stops in the parking position; in this position, the arm is lifted off with respect to the aircraft structure, at the windshield lower part (parking position). The liftoff device avoids any risk of collecting dust, sand or other abrasive particles which could cause windshield damage upon next operation of the wipers.
(6)
Various characteristics
(a)
Sweeping pressure (Ref. Fig. 012) The pressure of the wiper arm-blade assembly is adjustable within the range of pressures corresponding to forces between 2 daN (4.4961 lbf) and 5.5 daN (12.3644 lbf); these are applied to the center of the blade perpendicular to the windshield plane. Within these limits, there is no degradation of the system performance. In all the utilization conditions (normal or abnormal operation of the wiper system), rupture of one or several parts of this system will not result in damage to the aircraft structure or the engines. If, due to wiper system failure, the wiper arm stops away from the stop position (impossible to return the arm to the stop position), the flight can continue in all safety without any speed restriction.
(b)
Speed The wiper system operates efficiently without adverse effect on its performance up to corrected speeds, Vc, of 200 kts. Operation of the wiper system is even possible for speeds between 200 and 250 kts. In such a case, the wiper arm can be placed in the parking position.
R **ON A/C 001-049, 051-056,
B. Rain Repellent System
(1)
Rain-repellent fluid can
(a)
The pressurized can is attached to the aft-left wall of the cockpit.
(b)
The can contains 475 cubic centimeters of usable rain-repellent fluid.
(c)
The system is pressurized with nitrogen; the nitrogen pressure in the can when full is 5.8 +0.7 -0.4 bar (84.1218 +10.1526 -5.8015 psi).
(d)
A valve held closed under the load of internal pressure seals the can. A thin pin is provided for displacement of the valve.
(2)
Rain-repellent fluid-gage assembly
(a)
The gage assembly forms the can receptacle. The can is mounted on the receptacle, valve downwards. The receptacle includes the pin provided for unseating of the sealing valve of the can.
(b)
A pressure gage indicates the pressure in the can and thereby the quantity of fluid in the can:
-green band: the pressure is sufficient,
-yellow band: the pressure is low; the can must be replaced.
(c)
The fluid gage incorporates a 80 cubic centimeters transparent chamber in which a yellow float indicates the fluid level. When the can is completely empty, the remaining nitrogen pressure and the fluid remaining in the gage are still sufficient for several flights before replacement of the can.
(d)
A purge pushbutton located on the can serves to purge the lines of the system when the can is replaced.
R **ON A/C 001-049, 051-052, 054-099, 101-149, 151-199, 201-299, 301-399, R 401-499,
Post SB 30-1037 For A/C 001-049,051-052,054-056,
B. Rain Repellent System
(1)
Rain-repellent fluid can
(a)
The pressurized can is attached to the aft-left wall of the cockpit.
(b)
The can contains 475 cubic centimeters of usable rain-repellent fluid.
(c)
The system is pressurized with nitrogen; the nitrogen pressure in the can when full is 5.8 +0.7 -0.4 bar (84.1218 +10.1526 -5.8015 psi).
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本文链接地址：A320飞机维护手册 AMM ICE AND RAIN PROTECTION 防冰和排雨2(18)
