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30-43-0 Page 102 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. Nov 15/67
RAIN REPELLENT SYSTEM - MAINTENANCE PRACTICES
EFFECTIVITY
All airplanes with active rain repellent systems
1. General
A. The rain repellent system maintenance practices are instructions on replacing an empty rain repellent container, depressurizing the system prior to maintenance on the system plumbing, and cleaning rain repellent from the windshield that has been allowed to dry to a hard film.
B. With repellent container installed and the shutoff valve open, the rain repellent system will be pressurized between 40 and 80 psi, depending on the amount of fluid in the container. Before attempting maintenance on the pressurized plumbing, the system should be depressurized to avoid spraying repellent solution on the airplane structure or personnel. Rain repellent allowed to stand on the windshield will dry to a hard film. Special cleaner must be used to remove the hard film.
2. Rain Repellent Container - Replacement
A. Remove Rain Repellent Container
(1)
Turn selector valve to the closed position.
(2)
Unfasten container retaining clamp (Fig. 201).
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.
(3)
Unscrew container from receptacle and remove.
WARNING: DO NOT REMOVE CONTAINER UNLESS SELECTOR VALVE IS IN CLOSED POSITION AS PRESSURIZED REPELLENT FROM SYSTEM MAY BE SPRAYED FROM RECEPTACLE ONTO PERSONNEL.
B. Install Rain Repellent Container
(1)
Ensure that selector valve is turned to closed position.
(2)
Position container in receptacle and screw in position.
NOTE: Tighten container finger tight only. If connection shows evidence of leaking remove container and inspect container valve and receptacle for damage.
(3)
Fasten container retaining clamp.
(4)
Turn shutoff valve to open position.
NOTE: If a new rain repellent container is installed and the fluid remains at the low level, then the removal and reinstallation of the rain repellent container is required to relieve the gas pressure. This allows the fluid level indicator to read the correct level of the fluid.
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BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
3. Rain Repellent System Depressurization
A. Depressurize Selector Valve to Solenoid Valve.
(1)
Provide electrical power and check that the REPELLENT circuit breakers on the P6-1 panel are closed.
(2)
Turn shutoff valve to the closed position.
(3)
Wet windshield area down with water and actuate the repellent control switches several times to relieve system of any residual pressure.
(4)
Wash any remaining repellent from airplane structure.
CAUTION: DO NOT ALLOW REPELLENT SOLUTION TO REMAIN IN CONTACT WITH THE AIRPLANE STRUCTURE. ALL REPELLENT SOLUTION SHOULD BE WASHED OFF WITHIN TWO HOURS AFTER IT IS APPLIED.
(5)
If no longer required, remove electrical power from the airplane.
B. Depressurize container to shutoff valve.
(1) Remove container per paragraph 2.
4. Cleaning Dried Rain Repellent from Windshield
A. If rain repellent is inadvertently applied to a dry windshield and not washed off, it will dry to a hard film. To remove the hard film, use a mild detergent and a foam-filled nylon scrubber or its equivalent with a damp cloth and water, or an Ardrox 275-G cleaning pad (Ref 20-30-51).
B. In cases of heavy concentration of dried rain repellent on windshield, use rain repellent as a solvent with a damp cloth and water. Then rinse with clear water. Rain repellent may be applied from rain repellent system.
C. Wash any remaining repellent from the airplane structure.
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BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
RAIN REPELLENT SYSTEM - ADJUSTMENT/TEST
EFFECTIVITY
All airplanes with active rain repellent systems
1. Rain Repellent System Test
A. General
(1)
The following system tests are intended to functionally check the valve control circuit for continuity, the pressurized plumbing system for leakage and the time delay setting for proper flow control.
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