Narrative:

I was called out to check a cessna that I believe made an emergency landing into ZZZ airport; due to a left main gear unsafe light. After arriving at the aircraft; I inspected the left main landing gear electrical connections; and condition of down switch and landing gear in general. In looking at the components; I determined the intermittent problem to be a dirty and oily downlock switch. I proceeded to clean the switch and found the screws holding the switch in position were not tight. I finished the cleaning process with electrical cleaner and moved the switch slightly closer to the down position in the holder and tightened the screws. I was not able to do a gear swing due to lack of equipment at this airport. I would have preferred to do a landing gear swing to check the system and be sure the lights worked properly. All 3 down lights were in the green position when I finished. In the future; I will intend to have jacks brought to this airport; or obtain a ferry flight to repos the airplane to a place that we have the facilities to perform the required task and to assure the job is completed correctly.

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Original NASA ASRS Text

Title: A CESSNA 414 ACFT WAS RELEASED FOR SERVICE WITHOUT ACCOMPLISHING A MAIN LANDING GEAR SWING AFTER L/H GEAR 'UNSAFE' LIGHT ILLUMINATED ON INBOUND FLT.

Narrative: I WAS CALLED OUT TO CHK A CESSNA THAT I BELIEVE MADE AN EMER LNDG INTO ZZZ ARPT; DUE TO A L MAIN GEAR UNSAFE LIGHT. AFTER ARRIVING AT THE ACFT; I INSPECTED THE L MAIN LNDG GEAR ELECTRICAL CONNECTIONS; AND CONDITION OF DOWN SWITCH AND LNDG GEAR IN GENERAL. IN LOOKING AT THE COMPONENTS; I DETERMINED THE INTERMITTENT PROB TO BE A DIRTY AND OILY DOWNLOCK SWITCH. I PROCEEDED TO CLEAN THE SWITCH AND FOUND THE SCREWS HOLDING THE SWITCH IN POS WERE NOT TIGHT. I FINISHED THE CLEANING PROCESS WITH ELECTRICAL CLEANER AND MOVED THE SWITCH SLIGHTLY CLOSER TO THE DOWN POS IN THE HOLDER AND TIGHTENED THE SCREWS. I WAS NOT ABLE TO DO A GEAR SWING DUE TO LACK OF EQUIP AT THIS ARPT. I WOULD HAVE PREFERRED TO DO A LNDG GEAR SWING TO CHK THE SYS AND BE SURE THE LIGHTS WORKED PROPERLY. ALL 3 DOWN LIGHTS WERE IN THE GREEN POS WHEN I FINISHED. IN THE FUTURE; I WILL INTEND TO HAVE JACKS BROUGHT TO THIS ARPT; OR OBTAIN A FERRY FLT TO REPOS THE AIRPLANE TO A PLACE THAT WE HAVE THE FACILITIES TO PERFORM THE REQUIRED TASK AND TO ASSURE THE JOB IS COMPLETED CORRECTLY.

Data retrieved from NASA's ASRS site as of January 2009 and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.