Which statement describes when differences training is required?

• A. After every flight
• B. When moving to a different variant with substantive differences in systems or procedures
• C. Only for rotorcraft types
• D. Only for aircraft certified as experimental

Answer: (B)

Differences training is required when you move to a different variant that has substantive differences in its systems or procedures. The idea is to ensure you understand changes that could affect how the aircraft operates, including new or altered flight controls, avionics, procedures, performance figures, or emergency steps. This isn’t about flying the same aircraft more often or about rotorcraft specifically; it’s about bridging knowledge for variants where the differences could impact safety. If the variant’s differences are minor or cosmetic, differences training may not be needed, but when there are meaningful system or procedure changes, it’s required before operating that variant.