207WF Posted April 29, 2014 Author Report Posted April 29, 2014 Its the round rheostat in the center of the photo. Anyone know of a source? It seems to have failed internally. WF
Anticept Posted April 30, 2014 Report Posted April 30, 2014 What are the symptoms? I ask because you can strip the cheap plastic splines off and it may SEEM like it's broken.
Doug G. Posted April 30, 2014 Report Posted April 30, 2014 I am not certain mine does anything. The only thing I can think of is if the compass is lighted. I've never noticed if it is or not.
coppercity Posted April 30, 2014 Report Posted April 30, 2014 It should control the brightness of the light strip above the electrical switches, the lights in the wing root for the fuel sight tubes, the compass and the light rings on the analog gauges if they are installed. It only works if your navigation/position lights are on though.
Anticept Posted April 30, 2014 Report Posted April 30, 2014 I would need to look inside at the wiring, but in some aircraft installations, the rheostat is connected to the base of an NPN transistor. This is so that if the rheostat fails, the lighting will go full bright. That's why I am asking for symptoms, so I would know what to look for to cut down on research.
207WF Posted April 30, 2014 Author Report Posted April 30, 2014 There is an on-off position with a click; you turn it on then further clockwise to brighten the lights. The on-off position seems to "slip" around in a circle, retreating away from my attempts to click it off counter clockwise. I looked in the back and saw nothing loose. I am leaving it on, at the dimmest possible position, until I can get it fixed for fear that it might not turn on some time when I need it. WF
Doug G. Posted April 30, 2014 Report Posted April 30, 2014 Hmm...I need to go out to my hanger, keep the lights off and check this out. I wonder if the CTLS is different.
cdarza Posted April 30, 2014 Report Posted April 30, 2014 Is that a new style 'switch' for the master batt and gen ?
Anticept Posted April 30, 2014 Report Posted April 30, 2014 There is an on-off position with a click; you turn it on then further clockwise to brighten the lights. The on-off position seems to "slip" around in a circle, retreating away from my attempts to click it off counter clockwise. I looked in the back and saw nothing loose. I am leaving it on, at the dimmest possible position, until I can get it fixed for fear that it might not turn on some time when I need it. WF Pull the knob off and make sure the splines aren't stripped. Mine is stripped and I can't turn the lights off.
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