Helicopter Fuel & Systems

Most modern helicopters use Jet A turbine fuel; many piston trainers (Robinson R22, R44) use 100LL avgas. Different fuels mean different density, different cold-weather behavior, different contamination risks. This section covers fuel types and density (6.0 lb/gal avgas vs 6.7 lb/gal Jet A at standard temperature), fuel reserve requirements under 14 CFR 91.151(b), sump procedures, anti-icing additives, and contamination detection.