Gulfstream G200 (IAI 1126 Galaxy)
Flight Crew Air Transport Pilot (ATP)
Confusion; Workload; Troubleshooting; Training / Qualification
Aircraft Equipment Problem Less Severe; Flight Deck / Cabin / Aircraft Event Other / Unknown
Aircraft Aircraft Damaged; Flight Crew Took Evasive Action; General Maintenance Action; General Release Refused / Aircraft Not Accepted
Aircraft
During enroute climb I detected that my head was actually getting hot from the cockpit dome light. I immediately selected it off; this did not shut off the light. [I] called Maintenance from my personal phone who patched in with Gulfstream to determine how to shut it off. [I] attempted air stair dome light switch; which also failed to extinguish the light. By this time the light was beginning to overheat to the point of discoloration. It was then suggested I attempt to find a Circuit Breaker (CB); to isolate the light. CB recommendations from Maintenance were not successful. Then I pulled the air stair light CB and the dome light went out. Continued to intermediate stop; and requested an aircraft change; which was honored.
The reporter stated that he was at the point of considering diverting as the light continued to overheat. Maintenance was at a loss about the correct circuit breaker to open; so he began opening circuit breakers on a secondary lighting panel until the light was finally extinguished by an open Air Stair breaker. The reporter stated that the Galley Light Panel and Air Stair Light Panel are similar in design and both have been a source of problems in the past. The reporter has pushed on the Air Stair Light panel and had a light respond before the switch was selected ON.
A G-200 cockpit dome light overheated during climb; and would not turn off by its normal switch. After troubleshooting; a dome light circuit breaker was opened which extinguished the light.