What is the signal from the Flight Deck crew to indicate final descent/beginning of Sterile Flight Deck for arrival?

What is the signal from the Flight Deck crew to indicate final descent/beginning of Sterile Flight Deck for arrival?

• A. Double chime
• B. Single chime
• C. Three chimes
• D. No signal

Answer: (A)

The signal is a double chime. This audible cue is used to alert the cabin crew that the aircraft is in the final descent and the Sterile Flight Deck period is beginning, so nonessential service and conversations stop and preparations for landing are completed. The double chime is designed to be clear and unmistakable, reducing any chance of misinterpreting the cue during busy arrival phases. A single chime is typically associated with other cabin calls or operations, and three chimes would imply a different alert; no signal would fail to provide a timely, explicit indication that sterile procedures are now in effect.

The signal is a double chime. This audible cue is used to alert the cabin crew that the aircraft is in the final descent and the Sterile Flight Deck period is beginning, so nonessential service and conversations stop and preparations for landing are completed. The double chime is designed to be clear and unmistakable, reducing any chance of misinterpreting the cue during busy arrival phases. A single chime is typically associated with other cabin calls or operations, and three chimes would imply a different alert; no signal would fail to provide a timely, explicit indication that sterile procedures are now in effect.