What happened
The flight was operating under visual meteorological conditions during nighttime hours. The crew was conducting a return flight to San Jose but diverted to the Long Beach Airport. During the descent and final approach to this unfamiliar airport, the two pilots encountered a rapid succession of critical mechanical failures. First, the turbocharger system failed, followed by the loss of an alternator. Shortly thereafter, engine oil pressure was lost entirely.
As the aircraft continued its circling approach, the crew received an unsafe landing gear indication. To verify the position of the wheels, the pilots made a flyby of the control tower. During this maneuver, an in-flight fire broke out, which quickly led to a complete loss of engine power. Unable to maintain altitude or glide to the airport, the aircraft crashed onto the southbound lanes of the San Diego Freeway in Long Beach.
The investigation
Examination of the wreckage and components revealed multiple severe mechanical defects that contributed to the sequence of failures. Investigators found an improperly installed turbocharger unit, which likely initiated the cascade of events. Additionally, a cracked manifold exhaust was discovered, allowing hot gases to escape into areas where they could ignite materials.
Further inspection identified a burned main power lead, consistent with the electrical failure experienced by the crew. The engine itself had suffered catastrophic internal damage, including a separated cylinder. Hydraulic systems were also compromised, with a low fluid level found in the hydraulic reservoir, which likely contributed to the unsafe landing gear indication despite the gear potentially being mechanically extended.
Findings
The investigation highlighted significant maintenance and operational factors. Two years prior to this accident, the instructor pilot involved had been responsible for an unintentional gear-up landing in a different aircraft, suggesting a pattern of procedural errors. Furthermore, one year before this incident, the Federal Aviation Administration had revoked the inspection authorization of the mechanic who had performed work on the aircraft, indicating known deficiencies in the maintenance provider's qualifications.
The combination of improper turbocharger installation, exhaust leaks causing fire, and subsequent engine separation created an unsurvivable situation during a low-altitude approach. The crew's decision to circle at night over an unfamiliar airport with multiple system failures left no margin for error.