The main cause of the accident is due to a failure of

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The main cause of the accident is due to a failure of the aircraft’s right engine. Several factors provided crucial evidence to the main cause of the accident. First, slipstream soot marks ran along right engine nacelle to the right horizontal stabilizer, indicating an engine fire. Several 3
Zonk Air Accident witnesses attested to black smoke, fire, and or explosion of the right engine. The failure of the right engine, leading to a fire, gave warning signs from multiple sources. The crew indicated abnormal 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 operation and found minor fuel droplets below the engine. Maintenance personnel noted a small seep of fuel in the line gasket just fifteen hours prior to the flight. As a result, maintenance personnel fixed the issue, also adjusting the turbo waste gates. The crew noticed small fuel leaks on the faulty engine on the morning of the flight. Further investigation into maintenance history validates failure to properly update and log required maintenance for its aircraft. Owner/operator relied on contract maintenance personnel and did not properly complete logs and sign-offs. The company also failed to prove documentation for its crew in regards to human factors training or procedures for a safety management system. The aircraft was due to comply with an air worthiness directive for cracking of fuel line support brackets. Although the aircraft was deemed airworthy by the company and possessed an FAA registration, it was within ten hours of Time Before Overhaul (TBO) of the engines and also within two hours of its 100 hour inspection.

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