Incident Overview
During cruise at an altitude of 42,000 feet, the pilot attempted to adjust the map light. This action caused the associated circuit breaker to pop. The copilot subsequently reset the breaker, which immediately ignited a fire at the oxygen panel. The resulting flame exhibited a blowtorch effect, leading to extensive damage to the left interior of the pilot's station. Two passengers required hospitalization due to smoke inhalation.
Investigation Findings
Post-incident examination of the damaged area revealed that a wire from the light assembly had arced and made contact with an oxygen supply line. Additionally, investigators discovered loose oxygen lines located adjacent to the arcing point. These conditions allowed the electrical arc to ignite the oxygen, producing the intense fire.
Subsequent Actions
In response to the mishap, Learjet developed a protection kit designed to prevent contact between oxygen lines and electrical components. The kit aims to eliminate the risk of similar ignition sources in the future.