(2)  
Do not allow the rain repellent solution to remain in contact with the airplane structure. The area around the outside of the windshields should be wetted down with water prior to test. All repellent solution should be washed off within 2 hours after it is applied.

B.  Equipment and Materials
(1)  
Supply of new repellent containers

(2)  
Source of clean water for washing repellent solution from airplane structure

C.  Test Rain Repellent System
(1)  
Connect external electrical power and check that the left and right RAIN REPELLENT circuit breakers on the P18 circuit breaker panel are closed.

(2)  
Install a new container of repellent solution in the receptacle.

WARNING:  DO NOT LET THE RAIN REPELLENT FLUID TOUCH YOUR SKIN OR EYES. THE FLUID CAN CAUSE IRRITATION. DO NOT BREATHE THE FUMES. IF THE FLUID TOUCHES YOU, WASH YOUR SKIN OR EYES WITH WATER.
NOTE:  Tighten container finger-tight only. If connection shows evidence of leaking remove container and inspect container valve and receptacle for damage.
(3)  
Lower the left and right pilot instrument panels.

(4)  
Wet down the left windshield area with water and actuate the LEFT rain repellent control switch until solution is observed squirting from the nozzle.

May 01/99 30-43-0 Page 501
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.

(5)  Check that by the third actuation the rain repellent solution is sprayed on the windshield from all holes in the nozzle head in approximately equal streams, no evidence of entrapped air is present and the time delay circuit is shutting the system off while the switch is depressed. If fluid discharge time appears inadequate or excessive, adjust the time delay circuit as follows: 
NOTE:  If amount of fluid released is insufficient, before attempting circuit adjustment, check that cause is not due to release of entrapped air or blocked spray holes. 
(a)  
Gain access to time delay module, mounted on the rain repellent solenoid valve. 

(b)  
Disconnect time delay module from solenoid valve by backing off attachment nut. 

(c)  
Adjust time delay circuit through access hole in module. 

NOTE:  Adjusting for increased delay time provides increased repellent discharge volume.

(d)  
Reconnect time delay module to solenoid valve. 

(e)  
Repeat steps (4) and (5).

(6)  
Repeat steps (4) and (5) using the RIGHT rain repellent control switch. 

(7)  
Check all pressurized joints, connections and couplings between container receptacles and nozzles for evidence of leakage. No detectable leakage is permissible. 

NOTE: The fluid in rain repellent container P/N 65-38196-5 has a citrus scent.

(8)  
Raise and secure pilot's instruments panels back in place. 

(9)  
Upon completion of test and adjustments check that fluid level in reservoir is above REPLACE CAN Mark, if not, replace container. 

(10)
Determine whether or not there is any further need for electrical power on the airplane, if not, remove external power. 

(11)
Wash all remaining repellent solution from airplane structure. 

525 
30-43-0 Page 502  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  Feb 20/93 

RAIN REPELLENT SYSTEM - MAINTENANCE PRACTICES
EFFECTIVITY
All airplanes with active rain repellent systems Airplanes with Hydrophobic Coating on the Number 1 Windows
1.  General
A.  This procedure lists the equipment required to test and reapply the hydrophobic coating.
B.  A vendor kit is necessary to do this procedure.
2.  Hydrophobic Coating Maintenance Practices
A.  General
(1)  The maintenance procedures for the hydrophobic coating are contained in the Master Kit listed below.
B.  References
NOTE: These references are in the Master Kit.
(1)  
Maintenance Assessment, Application Procedures for Boeing Aircraft Models (P/N DSS 1022)

(2)  
Coating-Efficiency Assessment - video tape (P/N DSS 1023)

(3)  
Reapplication and First Time Application - video tape (P/N DSS 1024)

C.  Equipment
(1)  
Master Kit Complete (P/N DSS 1020)
PPG Industries, Inc.
Aircraft Products Sales

P.O. Box 04004
Huntsville, AL 35804 USA
FAX 205-851-8822

(2)  
Stand - 17 feet minimum

D.  Prepare for the Test/Reapplication
WARNING:  BEFORE YOU DO MAINTENANCE ON THE WINDSHIELD, OPEN THE WINDOW HEAT CIRCUIT BREAKERS. IF YOU DO NOT OPEN THESE CIRCUIT BREAKERS DURING MAINTENANCE, YOU CAN GET AN ELECTRICAL SHOCK WHEN YOU TOUCH THE WINDOW.
　
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