Beech C90A King Air
Worn Fuel Cap
The crew noticed fuel leaking from the right hand outboard fuel cap. Aircraft returned and the fuel cap was replaced with a new one. The aircraft has since flown 4.9 hours with no defects noted.
Fuel Cap Failures
The following is derived from maintenance facility submissions to the FAA’s Service Difficulty Reports database.
Key Takeaways:
- Fuel cap malfunctions present diverse aviation safety risks, from minor leaks caused by worn parts or deteriorated gaskets to critical in-flight fuel loss and engine failure due to manufacturing flaws, design defects, or unsecured/missing caps.
- Problems include physical damage (broken plastic), improper securing, manufacturing/design flaws (e.g., incorrect sealing, plugged vents), and general wear and tear of components.
- These issues can lead to consequences such as fuel siphoning, complete fuel tank depletion, and power loss during flight, emphasizing the critical need for proper cap function and maintenance.
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