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ALL ú ú 02.1 Page 406 ú Jul 12/02
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
ú ú ú (g) Momentary press and hold the master dim and test LIGHTS switch(P1-3) to the TEST position and make sure the lights on P1-3come on.
(5) S 864-015Put the airplane back to its usual condition.
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ALL ú ú 01.1 Page 407 ú Jul 12/02
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
RAIN REPELLENT SYSTEM - DESCRIPTION AND OPERATION
_________________________________________________
1. General_______
A. The rain repellent system is used together with the windshield wiper system to improve visibility through the pilots' windshields during heavy rain. The system is controlled independently for each window by separate control switches located on the overhead panel and, when actuated, the system sprays a rain repellent solution on the respective window as selected. The maximum quantity of solution sprayed per system actuation (approx 6cc) is predetermined by the setting on a time delay relay and cannot be exceeded by extended duration of switch actuation. The solution is spread over almost all of the window by the rain and airstream, however spreading is enhanced within the wiped area of the windows by the action of the wiper blades. The length of time that an application remains effective varies inversely with the rain intensity and will last longer in the wiped area than in the unwiped area. Reapplication is repeated as required to maintain repellent effectiveness.
B. The rain repellent system should not be operated on dry windows, as heavy undiluted solution will restrict window visibility. In the event of inadvertent dry window application, do not operate the windshield wipers as this tends to increase smearing. Also, the rain repellent residues caused by application in dry weather or very light rain may cause staining or minor corrosion of the airplane skin. To prevent this, any concentrated repellent or residue should be removed by a thorough fresh water rinse at the earliest opportunity, preferably within a few hours after exposure. Repellent residues allowed to dry or "cure" on the surface will require polishing with an approved aluminum polish to remove the stain. To remove residue from glass windows, use a repellent remover pad.
C. The rain repellent system consists of a pressurized container of rain repellent fluid, a container receptacle, a visual reservoir, a pressure gage, two solenoid valves, two nozzles, associated plumbing, and two electrical control circuits (Fig. 1 and 2).
D. AIRPLANES WITH HYDROPHOBIC COATING ON THE WINDSHIELD; The rain repellent system also consists of a hydrophobic coating applied to the number 1 window. No pilot actions are necessary to operate the system.
(1) Periodic maintenance is necessary to test and restore the coating on the windshield surface (AMM 30-43-00/201).
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ALL ú ú 02 Page 1 ú Jul 12/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
CONTROL SWITCH
SEE A
RAIN REPELLENT
NOZZLE ASSEMBLY AND TIME DELAY MODULE
SEE C
L R
CONTAINER INSTALLATION SEE B
A
NOZZLE
CAUTION TIGHTEN RAIN REPELLENT CAN INTO SYSTEM FINGER EXCESSIVE TORQUE MAY CAUSE LEAKAGE. TIGHT ONLY. TORQUE IS NOT REQUIRED FOR SEALING.
PRESSURIZED CAN CLAMP RELEASE TIME DELAY MODULE SOLENOID VALVE
BRACKET
SHUTOFF VALVE CAN CONNECTION SEE D C
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