(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 from which the fluid level is visible. 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.
**ON A/C ALL
(3)
Solenoid valve
(a)
Upon energization, the valve controls the flow of rain repellent fluid released to the nozzles by means of an incorporated electronic timing device. The timing device, adjustable between 0.1 and 1.0 second, is set at 0.4 second.
(b)
The solenoid valve is normally closed and is supplied with 28VDC nominal.
(4)
Spray nozzle
(a)
A single nozzle serves to spray the rain repellent fluid on the corresponding windshield.
(b)
The nozzle has four orifices of small diameter.
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(5)
Rain-repellent blowout reservoir
(a)
During application of the fluid onto the windshield, the reservoir provides an increase in transient air pressure which serves to purge the lines of the system after each application of the fluid.
(b)
It constitutes a decantation reservoir :
-
for the rain repellent fluid in the event of possible leakage of valves
-
for water which could remain in the air bled from the air conditioning system and freeze on the nozzle orifices.
(c)
The reservoir can serve as a test connector to check for absence of clogging of the nozzles, using an appropriate pressurization tool connected to the test valve of the reservoir.
(6)
Purge check valves
(a) Each valve is designed to prevent fluid to flow to the rain-repellent blowout reservoir and to the air conditioning system.
(7)
Test check valve
(a)
Each valve is designed to prevent fluid to flow to the rain-repellent blowout reservoir and to the air conditioning system.
(b)
The check valve is mainly provided to isolate the system located upstream (towards the air conditioning system) when the check of the nozzles is performed using a special pressurization tool which is connected to the rain-repellent blowout reservoir.
(8)
Ground checks
(a)
Check reading on the pressure gage fitted to the fluid gage assembly. If the pointer appears in the yellow band identified REPLACE, approximately ten applications of fluid are left in the can before need of can replacement.
(b)
When replacing the can, purge the system lines using the purge pushbutton located on the fluid gage assembly.
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(c)
Do not operate the system in dry weather conditions. In the event of inadvertent application on dry surfaces, wash at the earliest opportunity.
(d)
Avoid projections of fluid onto the mucous membranes.
(9) Utilization in flight
(a)
The rain-repellent system is used in heavy rain, more precisely when the wipers are not sufficient at high aircraft speed.
(b)
One or two applications of the fluid are generally sufficient for one takeoff or approach and landing sequence; however, the number of applications is unrestricted so as to improve visibility, regardless of the fluid amount used.
(c)
Never spray fluid on a dry windshield. In the event of inadvertent application, do not operate the wipers before the rain wets the windshield.
(10) Fluid leakage The rain repellent fluid contains an odorant (pine), which makes it easy for the crew to detect a leak in the cockpit and apply the associated emergency procedure.
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