Incident Description
During cruise altitude, the captain and first officer observed smoke emanating from underneath the airplane's instrument panel glareshield. The flight crew promptly donned smoke goggles and oxygen masks and initiated the emergency checklist.
Crew Actions
As part of the emergency procedures, the crew shut down the generators. Following this action, the smoke dissipated from the cockpit within approximately 4 minutes. The flight continued to its destination and landed without further event. All passengers deplaned without incident.
Investigation Findings
Subsequent examination of the instrument panel area revealed burnt wiring and a charred position light switch. Further inspection determined that the left wingtip's oscillating position light autotransformer had shorted out. Additionally, the position light circuit breaker was found stuck in the closed position, preventing it from tripping during the fault.