EASA SIB 2008-57
Transport Canada AV-2008-03 - Reciprocating Engine Fuel System Icing - Suspended Water in Fuel
Summary
Transport Canada AV-2008-03 is a Service Difficulty Advisory addressing the risk of fuel system icing caused by suspended water in fuel for aircraft powered by reciprocating engines, including those with Lycoming IO-540-B1A5 engines. The advisory highlights incidents such as an Aero Commander 500B forced landing due to fuel flow blockage from ice formed by dissolved water in the fuel. It aligns with EASA Safety Information Bulletin 2008-57, which supports Transport Canada's recommendations for operators in European Union Member States and associated countries.
What Changed
This advisory introduces awareness and guidance on the dangers of freezing dissolved water in reciprocating engine fuel systems, emphasizing the importance of following aircraft and engine manufacturer procedures to prevent fuel system icing. It reinforces the use of fuel anti-icing additives and references existing service letters from Lycoming and Teledyne Continental Motors for additional operator guidance. The advisory does not mandate regulatory changes but serves as a strong recommendation to improve safety.
Why It Matters
Fuel system icing caused by suspended water can lead to engine power loss and forced landings, posing significant safety risks. Aviation professionals, including operators and maintenance personnel, must understand these risks to prevent incidents and ensure continued airworthiness. Compliance with recommended procedures and use of fuel anti-icing additives can mitigate the risk of fuel system blockages and improve operational safety in cold weather environments.
What To Do
Operators of reciprocating engine aircraft should strictly follow the procedures and precautions outlined in their aircraft and engine operating manuals to prevent fuel system icing. They should familiarize themselves with Transport Canada's Aeronautical Information Manual section on fuel anti-icing additives and FAA Advisory Circular AC 20-113. Additionally, operators are encouraged to use fuel anti-icing additives as recommended in Lycoming Service Letter L172C and Teledyne Continental Motors Service Information Letter SIL99-2B. Any defects or malfunctions related to fuel system icing should be reported to Transport Canada Continuing Airworthiness as per CAR 591 requirements.
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