That lamp is a 250 watt lamp and should draw 9 amps.
If you are popping a 20 amp breaker you have a wire that is shorting
to chassis somewhere. Turn the light on shake the wires and tap with
a rubber mallet along the wire's route till the breaker pops. Some
where that wire runs over a sharp metal edge.

On 20 Aug 2004 23:34:19 GMT, (Hankal) wrote:

Landing light circuit breaker 20 amp. Pops after about one minute.
I have changed the landing light 4552, changed the CB and thought I had the
problem solved.
This morning Taxi at 6 am (still dark) I was pleased to have the landing light
while in close quarters, then the CB popped.
I have checked the wiring and connections and everything looks good.
Will go with my trusty amp meter and see what the bulb draws.
In the meantime can any one give some advise.
The plane is a C 172 with the Avcon conversion.
Thanks
Hank