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737-300/400/500MAINTENANCE MANUAL
B. When the control switch is turned to the PARK position and the wiper is in any position other than PARK, the switch completes a circuit through the PARK contacts of the control switch and through the N C contacts of the cam operated switch in the motor to ground. This will shunt the resistor box out of the control circuit and drive the motor at high speed until the motor reaches the PARK position of the wiper cycle and the switch cam moves the switch to close the N O contacts of the cam operated switch. With the cam operated switch in the N O position, the motor armature is shunted out by the cam operated switch and the circuit is completed to ground through the PARK contact of the control switch and the full resistor load. With the motor field coil still energized and the motor armature shorted by the cam operated switch, dynamic braking is provided to stop the motor from coasting. This stops the motor with the wiper blades in the PARK position.
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737-300/400/500MAINTENANCE MANUAL
WINDSHIELD WIPER SYSTEM - TROUBLE SHOOTING
1. Windshield Wiper System Trouble Shooting Chart
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CONTINUED FROM PRECEDING PAGE
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WINDSHIELD WIPER SYSTEM - ADJUSTMENT/TEST
_________________________________________
1. General
_______
A. This procedure is an operational test of the windshield wiper system. During this procedure you must apply water to the windshield.
TASK 30-42-00-705-001
2. Operational Test - Windshield Wiper System
__________________________________________
A. References
(1) 24-22-00/201, Manual Control
B. Access
(1) Location Zone 101 Control Cabin, LH - Outside No. 1 Left Window 102 Control Cabin, RH - Outside No. 1 Right Window
C. Procedure
S 865-002
(1) Supply electrical power (Ref 24-22-00/201).
S 645-004
CAUTION: YOU MUST APPLY WATER TO THE WINDSHIELD BEFORE YOU OPERATE THE
_______ WIPERS. OPERATION OF THE WIPERS WITHOUT WATER CAN CAUSE DAMAGE TO THE WINDSHIELD.
(2) Apply a spray of clean water to the windshield.
NOTE: Continue to apply the water when the wiper is in motion.
____
S 715-005
(3) Make sure that the windshield wipers operate correctly:
(a) Set the WIPER switch (P5 panel) to LO. 1) Make sure that the wiper blades move freely and smoothly. 2) Make sure that the wiper blades do not touch the airplane
structure.
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(b) Set the windshield WIPER switch to HI.
NOTE: In the HI position, the wiper blade moves at a minimum
____
of 250 strokes per minute.
1) Make sure that the wiper blades move freely and smoothly. 2) Make sure that the wiper blades do not make too much noise. 3) Make sure that the wiper blades do not touch the airplane 中国航空网 www.aero.cn 航空翻译 www.aviation.cn 本文链接地址：737-300 400 500 AMM 飞机维护手册 防冰和排雨(79)
