The landing light in my 1979 Cessna 172N keeps blowing out. I have
replaced it 3 time and rarely use it. The past bulb hasn't been
lighted more than 3 minutes, max. I preflight and it is fine, went to
land - dark, no light. Perhaps a lose connection (I'll) check again
or possible a surge in the electrical system? Any thought would be
appreciated. Thanks C.Urick (VA)