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Landing Gear Lights-Need Wiring Help



 
 
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  #1  
Old August 16th 03, 10:18 PM
BG
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Default Landing Gear Lights-Need Wiring Help

Hello,

I'm replacing the landing gear down indicator lights and the transition
light in a Lancair 235. The installed lights are the kind that snap into a
hole in the panel, and the bulb is not accessible without removing the
entire light fixture.

I'm replacing those with the push-to-test type of lights found on most
certified aircraft (MS25041). The advantage being that one can check a
non-illumnating light to determine wether the circuit is open, or the bulb
is bad. The bulb can also be replaced from within the cockpit.

The dilema I am having is how these lights wire up: There are three
terminals on the fixture Vs. two on the old ones.
One terminal in the center and two on the outer edges. If I wire the
center(+) and one of the outer edges(-) to the circuit the light comes on
when its supposed to. However, the light won't illuminate when the
push-to-test feature is used (light pushed in).

What does the un-used terminal get wired to? An always on supply (+)?
I'm afraid to try it for fear of shorting something out. I welcome any
advice from someone who has wired these up before.

thanks in advance,
Bill Gilbert
N235JR


  #2  
Old August 16th 03, 10:27 PM
Morgans
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Posts: n/a
Default


"BG" wrote in message
news:7dx%a.1164$kP.156@fed1read03...
Hello,

I'm replacing the landing gear down indicator lights and the transition
light in a Lancair 235. The installed lights are the kind that snap into a
hole in the panel, and the bulb is not accessible without removing the
entire light fixture.

I'm replacing those with the push-to-test type of lights found on most
certified aircraft (MS25041). The advantage being that one can check a
non-illumnating light to determine wether the circuit is open, or the bulb
is bad. The bulb can also be replaced from within the cockpit.

The dilema I am having is how these lights wire up: There are three
terminals on the fixture Vs. two on the old ones.
One terminal in the center and two on the outer edges. If I wire the
center(+) and one of the outer edges(-) to the circuit the light comes on
when its supposed to. However, the light won't illuminate when the
push-to-test feature is used (light pushed in).

What does the un-used terminal get wired to? An always on supply (+)?
I'm afraid to try it for fear of shorting something out. I welcome any
advice from someone who has wired these up before.

thanks in advance,
Bill Gilbert
N235JR

\

I've not installed one of these before, but what you need to do is check the
terminals with a volt ohm meter. Find out what is normaly open and normaly
closed, then go from there.

--
Jim in NC--


  #3  
Old August 16th 03, 11:21 PM
BG
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Posts: n/a
Default


"Morgans" wrote in message
...


I've not installed one of these before, but what you need to do is check

the
terminals with a volt ohm meter. Find out what is normaly open and

normaly
closed, then go from there.

--
Jim in NC--

I should have included more detail. In the position that you are not
pushing on it, find out which terminals pass the electricity through the
bulb. Next, push the bulb, and find which terminals cause the juice to go
through the bulb. Use the terminals that were not causing the bulb to

light
in the un-pushed state, but lighting when you push it, for hooking to the
always on (with master on), and the other terminals to the indicating
circuit.

Does that make any sense?
--
Jim in NC--

Yep, sure does.

That's what I thought; that the un-used terminal, when the light is on,
would have to be hooked up to a "live" curcuit.
Thanks for confirming my thought. I'll have to try it out next.
Actually, I just saw some lights in Aircraft Spruce that allow for bulb
replacement, but aren't push to test. Simpler to wire up and gives me the
light bulb check I need in case a gear light doesn't go on.

Bill G



 




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