What was found
PILOT REPORTED DURING LANDING THAT THE LEFT LANDING GEAR DOWN & LOCK LIGHT DID NOT ILLUMINATE AT DEPLOYMENT. AN "EMERGENCY LANDING GEAR EXTENSION" WAS PERFORMED BY THE PILOT WITH UP TO 60 HAND STROKES AS PER THE POH, BUT THE DOWN & LOCK LIGHT DID NOT ILLUMINATE. THE LANDING WAS NORMAL WITH NO INCIDENTS. MAINTENANCE REVIEWED THE DOWN & LOCK LIGHT INDICATION SYSTEM AND FOUND THE LEFT MICRO-SWITCH WAS DIRTY WITH DEBRIS. THE MICRO-SWITCH WAS CLEANED, LUBRICATED AND FREE PER PA31-350 MM PARAGRAPH 7-23. PERFORMED LANDING GEAR RETRACTION PER PIPER MM AND FOUND SATISFACTORY. PERIODIC MAINTENANCE TO INCLUDE CLEANING AND LUBRICATION OF THE LANDING GEAR DOWN & LOCK MICRO-SWITCH SHOULD REDUCE OR ELIMINATE THE RECURRENCE OF A FALSE INDICATION.