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The main cause of the accident is due to a failure of the aircraft’s right engine. Severalfactors provided crucial evidence to the main cause of the accident. First, slipstream soot marksran along right engine nacelle to the right horizontal stabilizer, indicating an engine fire. Several3
Zonk Air Accidentwitnesses attested to black smoke, fire, and or explosion of the right engine. The failure of theright engine, leading to a fire, gave warning signs from multiple sources. The crew indicatedabnormal engine operations ten days prior to the accident. The owner ignored the warnings.Multiple indications pointed toward fuel leaks resulting in power loss during normal operationand found minor fuel droplets below the engine. Maintenance personnel noted a small seep offuel in the line gasket just fifteen hours prior to the flight. As a result, maintenance personnelfixed the issue, also adjusting the turbo waste gates. The crew noticed small fuel leaks on thefaulty engine on the morning of the flight. Further investigation into maintenance historyvalidates failure to properly update and log required maintenance for its aircraft. Owner/operatorrelied on contract maintenance personnel and did not properly complete logs and sign-offs. Thecompany also failed to prove documentation for its crew in regards to human factors training orprocedures for a safety management system. The aircraft was due to comply with an airworthiness directive for cracking of fuel line support brackets. Although the aircraft was deemedairworthy by the company and possessed an FAA registration, it was within ten hours of TimeBefore Overhaul (TBO) of the engines and also within two hours of its 100 hour inspection.