Which option names the regulation prohibiting flight crewmembers from performing any duties during the critical phase of flight except those required for the safe operation of the airplane?

• A. Rest period regulation
• B. No-Fly Zone
• C. Passenger service rule
• D. Sterile flight deck

Answer: (D)

During the most demanding moments of flight, only tasks essential to safely operating the airplane are allowed in the cockpit. This restriction is the sterile flight deck rule. It exists to keep pilots focused and free from distractions when workload is highest, such as during taxi, takeoff, approach, and landing. That’s why this regulation is named the sterile flight deck. The other ideas don’t match because rest period rules govern how long crew must rest, No-Fly Zone refers to restricted airspace, and passenger service rules cover interacting with passengers.