Narrative:

While preparing to land the landing gear was selected down. I noticed the left main gear 'green' light was inoperative and a red in-transit light illuminated. I notified the tower we had an unsafe gear indication and would need some time to complete a checklist before landing. I; the pilot not flying; completed the landing gear not down and locked checklist and also the alternate gear extension checklist. Upon completion of the checklist the red in-transit light extinguished and 3 green lights were illuminated. We landed with no further events.

Google
 

Original NASA ASRS Text

Title: A BE400 executed a go-around when the left main landing gear failed to extend on final approach. Upon completion of the Alternate Gear Extension checklist the gear indicated safe and a normal landing was made.

Narrative: While preparing to land the landing gear was selected down. I noticed the left main gear 'green' light was inoperative and a red in-transit light illuminated. I notified the Tower we had an unsafe gear indication and would need some time to complete a checklist before landing. I; the pilot not flying; completed the Landing Gear Not Down And Locked checklist and also the Alternate Gear Extension checklist. Upon completion of the checklist the red in-transit light extinguished and 3 green lights were illuminated. We landed with no further events.

Data retrieved from NASA's ASRS site as of April 2012 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.