On Interphone Code 26, what does a steady blue call light indicator with one high chime indicate?

• A. Lavatory assistance request
• B. Guest Seat Call
• C. FD to cabin
• D. Smoke detector activated

Answer: (B)

Interphone signaling uses color and tone to convey who is calling and what they want. A steady blue light with a single high-pitched chime means a guest seat call—the passenger at a seat has pressed their call button and is requesting assistance. The steady light shows the call is active until acknowledged, and the one high chime identifies it as a standard passenger call rather than an emergency or other type of alert. When you hear it, go to the indicated seat, assist the passenger, then acknowledge the call to clear the light. Other calls use different light colors or patterns, so the crew can tell at a glance what kind of request is coming in.