Incident Overview
After receiving takeoff clearance, the pilot activated the strobe lights and transponder. Approximately 2 to 5 seconds later, a minor explosion occurred, and fire engulfed the right wing. The airplane had a recent history of fuel leaks in the right wing.
Maintenance Findings
A review of the maintenance records revealed that Airworthiness Directive (AD) 74-24-03 had not been accomplished. The AD stated, "To preclude possible ignition of flammable fluids and vapors by arcing between the strobe light and aircraft structure, deactivate the strobe light system."
Inspection Program Deficiencies
The operator's Approved Aircraft Inspection Program (AAIP) did not address fuel systems and related components. Subsequently, the Federal Aviation Administration (FAA) issued directives revising the operator's AAIP to include routine inspections of fuel systems and related components.
Conclusion
The investigation documented the sequence of events and the unmet AD requirement. The FAA acted to update the inspection program to cover fuel systems.