When does sterile flight deck end after takeoff?

• A. Two single chimes at or above 10,000 feet
• B. One long chime
• C. Three chimes
• D. After reaching destination

Answer: (A)

Sterile flight deck is a rule that minimizes nonessential activity and conversation during critical phases of flight, especially the takeoff and initial climb, to keep pilots focused on safety-critical tasks. The period remains in effect from taxi and takeoff through the climb until the aircraft reaches a certain altitude. When the airplane climbs through 10,000 feet above the surface, two short chimes signal that the sterile phase has ended and normal cockpit communication may resume. This cue helps crews know when they can discuss nonessential items again and proceed with standard operational routines. The other options don’t fit because a long chime isn’t the standard cue for ending sterile, three chimes aren’t the indicated signal for this transition, and ending sterile after reaching the destination would ignore the safety-critical period during takeoff and approach.