How do you perform a basic check on the cabin interphone and intercom system on the ATR?

• A. Test interphone connectivity between cockpit and cabin; verify call tones and volumes; reset if needed.
• B. Only test onboard speakers in cabin.
• C. Check oxygen system.
• D. Test flight data recorder.

Answer: (A)

A basic check of the cabin interphone and intercom is about ensuring a two-way link between cockpit and cabin and that the alert tones and volume controls work properly. Start by activating the interphone from the cockpit and calling the cabin, then confirm the cabin crew hears the call, the correct alert tone plays, and the volume can be adjusted to a comfortable level. Then do the reverse: have the cabin initiate a call to the cockpit and verify clear voice communication, the tone is present, and the cockpit side responds with adjustable volume. If any part of the path is missing or distorted, reset the interphone system as needed to clear minor faults. Other systems like the oxygen supply or the flight data recorder aren’t part of this basic interphone check, so they’re not included in this procedure.