Which statement about the HI-LO chime used on the interphone is true?

Which statement about the HI-LO chime used on the interphone is true?

• A. It sounds at all stations and can be answered anywhere
• B. It sounds only in the cockpit
• C. It triggers a cabin PA announcement
• D. It sounds at all stations but can only be answered at the station being called

Answer: (D)

When the interphone call is placed, the HI-LO chime acts as a broad alert that’s heard at every crew station across the aircraft. It’s designed to grab attention quickly, no matter where you are. At the same time, the system is directional: the call is addressed to a specific station, and only that station can answer to establish the conversation. This keeps communications orderly and prevents multiple people from hopping into the call. So the behavior aligns with the statement that it sounds at all stations but can only be answered at the station being called. It isn’t limited to the cockpit, and it doesn’t automatically trigger a cabin PA announcement.

When the interphone call is placed, the HI-LO chime acts as a broad alert that’s heard at every crew station across the aircraft. It’s designed to grab attention quickly, no matter where you are. At the same time, the system is directional: the call is addressed to a specific station, and only that station can answer to establish the conversation. This keeps communications orderly and prevents multiple people from hopping into the call.

So the behavior aligns with the statement that it sounds at all stations but can only be answered at the station being called. It isn’t limited to the cockpit, and it doesn’t automatically trigger a cabin PA announcement.