Interphone Code 29 is used for which communication?

• A. Public Address to main cabin
• B. Emergency call to all stations
• C. Interphone call to FD
• D. Interphone call to AFT cabin

Answer: (B)

The situation tests understanding of when a signal is meant to reach every crew member. An emergency call to all stations is used when a crisis requires immediate, universal alert and coordination—flight deck and all cabin sections alike must hear and respond. That broad broadcast ensures no one is left out, which is essential in urgent situations. In contrast, calling the flight deck only, calling only the aft cabin, or issuing a public-address to the main cabin would not reach the entire crew simultaneously, so they wouldn’t be as effective for an all-hands emergency response.