What is the first action in the Interphone Check performed by the SCCM?

What is the first action in the Interphone Check performed by the SCCM?

• A. Press INT+ALL
• B. Confer with the flight deck
• C. Announce 'PA CHECK'
• D. Call CAPT

Answer: (A)

The first action is to initiate a system-wide test by sending a call to all interphone stations. Pressing INT+ALL starts a signal that reaches every interphone path—from the cabin to the flight deck—so you can quickly verify that the basic communication link is active. Establishing this baseline ensures the interphone system is functioning before you attempt to contact a specific party or perform additional checks. Once you confirm the path to all stations, you would then proceed with targeted steps like checking with the flight deck, performing a PA test, or calling the Captain as required. Skipping this initial broadcast could hide a fault in the interphone system, delaying or preventing any further communication during the check.

The first action is to initiate a system-wide test by sending a call to all interphone stations. Pressing INT+ALL starts a signal that reaches every interphone path—from the cabin to the flight deck—so you can quickly verify that the basic communication link is active. Establishing this baseline ensures the interphone system is functioning before you attempt to contact a specific party or perform additional checks. Once you confirm the path to all stations, you would then proceed with targeted steps like checking with the flight deck, performing a PA test, or calling the Captain as required. Skipping this initial broadcast could hide a fault in the interphone system, delaying or preventing any further communication during the check.