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Cambridge 302 Gear/Airbrake Warning - How to Test?
I am in the midst of a project to install a gear/airbrake warning
system on my glider based on the built-in capability of my Cambridge 302. This system is better than the simple "airbrakes open, gear up" warning system (http://www.wingsandwheels.com/pdf/gear%20warning.pdf) as it also alerts the pilot to "airbrakes open on tow". My "sensors" will be strategically placed reed switches and associated magnets (and tefzel wire of course). My primary question revolves around how to do a pre-flight test of the system. From the manual... "Warnings depend on presence or absence of airspeed as well as the switch contacts. Here is the logic: Unlocking the airbrakes connects pin 7 to ground. When airspeed rises above 25 knots, the alarm sounds. The alarm is cancelled when the airbrakes are locked. During flight with the landing gear retracted, unlocking the airbrakes connects pin 7 to ground and sounds the alarm. Lowering the landing gear opens the connection between pin 8 and ground and cancels the alarm." Reading from the above it would seem that the alarm system is totally inactive until the GPS indicates I am moving 25+ knots. If so, how can I test this system on the ground? Anyone else install this system and have any experience? This weekend I will experiment to see if the 302 programming is smart enough to allow testing while I am standing still. Thanks, John DeRosa |
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