Learjet 35
Flight Crew Commercial
Aircraft Equipment Problem Less Severe; Inflight Event / Encounter Wake Vortex Encounter
Flight Crew Overcame Equipment Problem; General Declared Emergency
Aircraft; Environment - Non Weather Related
On approach; placed the gear in the down position. Observed 2 green and 2 red lights. The nose and right main gear were down and locked the left main did not indicate it was down and locked. I notified the PIC. Tested the gear lights; [and] then recycled the gear. Full up; then full down to see if they would come down and lock. The gear did not. We then notified the Control Tower we were having gear problems and we needed to do a few turns around the airport to run the checklist and see if we could get the gear down. We did the Emergency Gear Down checklist. Used the air-bottle. It didn't work to get the gear down and locked. Then we notified the Tower that our gear was not coming down and we wanted to go to [a nearby airport] to land. Switched to Approach [and] notified we were an emergency aircraft; we had our nose wheel and right main down and locked; but we didn't have the left main down and locked. We were then vectored for the visual low pass for the Tower to take a look at our gear. Tower advised they had 2 people in the Tower that observed 3 gear. Completed the low pass vectored for visual 26R. While on downwind encountered wake turbulence from the MD80 ahead; 3 green and 2 red indicated on gear indicator. Notified ATC we had 3 down and locked. Landed and taxied in. This aircraft had been written up for gear related issues [twice in the recent past] and returned to service.
Lear 35 First Officer reported problems with the gear indicator lights that were eventually resolved; resulting in a normal landing.