Gear Horn Issue

[Skymaster337B]

Check the main gear down lock switches. It is possible they make a very soft contact. I had a similar problem. I had to put a shim on the contact pads so the switch would make a very firm contact. I guess the contact pads wear with time. Additionally, you can replace the switch actuator arm (part number S2112-1) too, without replacing the switch. An actuator arm is only $12, but the whole switch is $100+. Let me know if this helped.

[billsheila]

Herb;
I had this problem (but inconsistent) with the horn. Never tried the hand pump test, but I am not surprised because the light circuit is hooked into the horn circuit, (and into the door solenoid) as you know. I think the prior thread suggesting to look at the switches is a good place to start. I think the solenoid either works or it doesn't. When they were troubleshooting all my problems they tested it by simply putting power to it...if you get a nice solid click, all is find with the solenoid.

Bill

[Skymaster337B]

With my gear problem, it worked fine during the manual hand pump down. But in flight, with a dynamic load on it, the switch didn't make a full contact.

[hew]

With my '70 C337E. When the gear is up and throttles open horn sounds . Press to test the green light, light comes on horn quiet. When gear goes down, horn quiet, green light on.
Did anyone find a solution??

[hharney]

HEW

What about your throttle body switches on the engine? Are they adjusted correctly? They should sound the horn when the gear is up and the throttles are pulled back to low power. It is a warning system to alert you that the gear is not down. One on each engine

[hew]

Yup, throttle microswitches ok.

[hew]

Got rid of the noise of the gear warning horn. One of the throttle body switches had an intermittent fault which didn't show up on ground testing but then did so in the air and occasionally went away. While waiting for a new microswitch we simply bypassed the microswitch allowing the other engine to provide the gear-up throttle closed warning. If we had just disconnected the ground from the warning noise box we would have lost all warning sounds. Nevertheless, I had trouble hearing the horn anyway as I have good noise cancelling headsets!