EASA AD CF-2018-07
Fuel System — Corrosion of fuel system components
Summary
Canadian Airworthiness Directive CF-2018-07 addresses corrosion issues in the fuel system components of Viking Air Ltd. DHC-6-400 aircraft, serial numbers 845 to 957, specifically those operating on floats. The directive mandates inspections and modifications to prevent fuel leaks, electrical arcing, and fuel system malfunctions caused by corrosion in the fuel gallery. It provides detailed corrective actions to ensure continued airworthiness and safety.
What Changed
This new Airworthiness Directive introduces mandatory inspections and modifications for corrosion protection in the fuel system of float-equipped Viking DHC-6-400 aircraft. It requires operators to inspect and rectify fuel gallery components within 50 flight hours or 3 months and to complete specified modifications within 12 months. Additionally, it mandates recurring sealant removal and corrosion inspections every 1000 flight hours for certain serial numbers.
Why It Matters
This directive is critical for aviation professionals to prevent fuel system failures that can lead to engine power loss or fire hazards. Operators and maintenance teams must comply to ensure the reliability of fuel boost pumps and accurate fuel quantity readings, especially for floatplane operations. Compliance reduces safety risks associated with corrosion-induced fuel leaks and electrical arcing in the fuel system.
What To Do
Operators of Viking DHC-6-400 aircraft with serial numbers 845 to 957 operating on floats must inspect fuel gallery components within 50 flight hours or 3 months from March 9, 2018, and complete required modifications within 12 months. For aircraft converted to float operation after this date, modifications must be done within 12 months of conversion. For serial numbers 845 to 935, recurring inspections and sealant maintenance are required every 1000 flight hours after modification.
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