"Morgans" wrote in message
...

"Hankal" wrote in message
...
Landing light circuit breaker 20 amp. Pops after about one minute.
.
Thanks
Hank

Check voltage drop across the switch. Could be high resistance in the
switch. Could be corroded slide terminals that go on the bulb. Could be
multi strand wires, with some of the strands broken. Find the culprit, as
one of them could let you down, when most needed. Also, has anyone stole
some power from that circuit, to power some avionics, or such?
--
Jim in NC


High resistance in the switch will make the current less, with less chance
to pop the breaker.
Likewise for corroded bulb terminals. Likewise for strands broken in the
wires (as long as the strands are not breaking through the insulation and
contacting the airframe.

Now the breaker itself could develop high resistance contacts....heating the
breaker internally and causing it to trip at a lower current than the rated
20 Amps. I suspect the breaker if the insulation on the wiring is in good
shape. Also check the lugs and wires as they attach to the back of the
breaker. If these are loose or corroded, the heated lugs can also warm the
breaker causing premature tripping.

J. Severyn