In cold-weather operations, what parameter must be monitored to prevent fuel icing or gelling?

• A. Monitoring fuel temperature within certified limits to prevent icing or gelling
• B. Checking for water contamination only
• C. Verifying color of fuel
• D. Ensuring fuel is pure kerosene with no additives

Answer: (A)

Monitor fuel temperature within certified limits to prevent icing or gelling. In cold weather, water in the fuel can freeze as the temperature drops, and paraffin waxes can precipitate, forming ice or a gel that can clog filters and restrict fuel flow. Keeping the fuel temperature above the critical points specified for the fuel and aircraft helps ensure water remains dissolved and the fuel stays fluid, reducing the risk of icing or gel. Checking water contamination alone doesn’t address the phase change risks, color isn’t a reliable indicator, and assuming purity or lack of additives doesn’t guarantee avoidance of freezing concerns.