B737-300
Flight Crew Air Transport Pilot (ATP)
Flight Crew Last 90 Days 169; Flight Crew Type 10660
Aircraft Equipment Problem Less Severe
Flight Crew Overcame Equipment Problem
Aircraft
On approach at the FAF we lowered the gear but had no Landing Gear Indication lights. With no time to trouble shoot; we elected a low approach while leaving the landing gear handle down and asking the Tower to give us their opinion of our gear status. The Tower confirmed what we believed. Our gear was in fact down. After the low approach and establishing ourselves on downwind we began an analysis and found [a] circuit breaker was popped.The First Officer found the breaker and after a discussion that his shoulder harness may have popped the CB; I directed him to reset the breaker. We regained two of the three gear lights. However the left gear light remained extinguished. We swapped the right gear light for the left light and it illuminated down. So we swapped it back and replaced the bulbs in the left gear indicator. One of the bulbs illuminated in the left gear and we elected to land with no further incident.
[Report narrative contained no additional information].
B737 flight crew reported an issue with the landing gear indicating light system that was traced to a popped circuit breaker. Flight crew surmised the popped breaker could have been caused by the shoulder harness.