When must crewmembers wear seat belts and shoulder harnesses?

• A. Seat belts only during turbulence; shoulder harness at all times.
• B. Seat belts anytime a crewmember is in their seat; shoulder harnesses for takeoff and landing, unless interference.
• C. Seat belts never required; shoulder harnesses during flight.
• D. Only passengers must wear seat belts.

Answer: (B)

Crewmembers must be secured with a seat belt anytime they are in their seat, providing protection through taxi, takeoff, landing, and any turbulence or unexpected movement. The shoulder harness adds an upper-body restraint and is required specifically during takeoff and landing to protect against the higher accelerations in those phases. It should be worn unless wearing it would interfere with performing duties. This combination keeps crewmembers protected during the most critical moments while also ensuring a basic restraint is in place at all times when seated.