INSTRUCTOR WITH ATP STUDENT HAS 2 GREEN ON GEAR EXTENSION BUT NOTHING FOR L GEAR. REQUEST CFR EQUIP.

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THE FLT WAS FOR TRAINING OF AN ATP APPLICANT. IN THE PRACTICE AREA WE PERFORMED MINIMUM CTLABLE AIRSPD MANEUVER (MCA). DURING THE MANEUVER WE SELECTED GEAR DOWN AND RECEIVED A GREEN FOR THE NOSE AND R GEAR BUT NOTHING FOR THE L GEAR. WE TESTED THE BULB AND IT WAS FINE. WE RECYCLED THE GEAR 2 OR 3 TIMES. NOTHING FOR THE L GEAR BUT NORMAL FOR THE NOSE AND R. ON THE 4TH ATTEMPT THE LIGHT CAME ON; THEN OFF; THEN ON -- IT WAS FLICKERING. WE CHKED THE EMER CHKLIST TO SEE WHAT WE COULD DO. THERE WAS NOTHING LISTED FOR THIS KIND OF PROB. WE THEN RETURNED TO THE ARPT FOR A FLY-BY AND THE TWR SAID THE L GEAR APPEARED DOWN. WE ASKED FOR THE EQUIP TO BE BROUGHT OUT AND LANDED SUCCESSFULLY. WE PULLED OFF THE RWY; SHUT DOWN AND ASKED FOR A TOW IN TO THE RAMP. AT THIS TIME IT APPEARS TO HAVE BEEN A MICRO SWITCH PROB IN THE WHEEL WELL. THE ACFT TYPE WAS A BE-76. HANDLING OF OUR FLT BY THE TWR WAS EXCELLENT; WE RECEIVED ALL THAT WE ASKED FOR. WE DID NOT EMER EXTEND THE GEAR BECAUSE WE WERE NOT SURE IF THAT WOULD COMPLICATE PROBS WITH THE 2 GOOD GREENS. WE HAD FELT THAT ALL THE TIME IT WAS ELECTRICAL PROB/MICRO SWITCH PROB. IT WOULD BE NICE IF BEECHCRAFT WOULD INDICATE SOME SORT OF CHKLIST FOR THIS KIND OF PROB.