Which item indicates airworthiness and legality for the planned flights?

• A. MEL remains in its category window.
• B. EFB is current and accessible with current versions of Jepps, GOM, GMM, and OEM.
• C. Airworthiness Release is current and valid for the planned flights.
• D. QRH's are present.

Answer: (C)

Airworthiness and legality for the planned flight are confirmed by the Airworthiness Release. This document certifies that the aircraft has undergone required maintenance and inspections and is approved to operate for the upcoming flight under the applicable regulations. It directly ties the aircraft’s condition to its eligibility to fly, which is the essence of airworthiness.

The other items touch on useful aspects of flight operation but don’t by themselves prove airworthiness: the MEL status only covers permitted inoperative equipment, not the overall airworthiness; the EFB and navigation data being current supports safe planning but isn’t a certification of airworthiness; and the QRH being present relates to abnormal procedures rather than the aircraft’s legal flight authorization.