A single chime indicates the end of the sterile flight deck at ____ feet, meaning it is safe to begin duties.

A single chime indicates the end of the sterile flight deck at ____ feet, meaning it is safe to begin duties.

• A. 5,000
• B. 10,000
• C. 15,000
• D. 20,000

Answer: (B)

The main idea here is understanding sterile flight deck procedures and the cue that signals when nonessential duties can resume. On the flight deck, operations during critical phases are kept “sterile” to minimize distractions and reduce risk, allowing only essential actions and communications related to aircraft handling. A single chime is the standardized signal that ends that sterile period. When you hear it, you’re at the point where it’s safe to begin duties again, specifically at 10,000 feet, and crew may return to normal activity and conversations while still following safety protocols. The other altitudes would not align with the standard timing for resuming nonessential duties: ending too early at a lower altitude risks distractions during ongoing critical tasks, while ending later at higher altitudes would keep crew restrained longer than necessary.

The main idea here is understanding sterile flight deck procedures and the cue that signals when nonessential duties can resume. On the flight deck, operations during critical phases are kept “sterile” to minimize distractions and reduce risk, allowing only essential actions and communications related to aircraft handling. A single chime is the standardized signal that ends that sterile period. When you hear it, you’re at the point where it’s safe to begin duties again, specifically at 10,000 feet, and crew may return to normal activity and conversations while still following safety protocols.

The other altitudes would not align with the standard timing for resuming nonessential duties: ending too early at a lower altitude risks distractions during ongoing critical tasks, while ending later at higher altitudes would keep crew restrained longer than necessary.