Which command may be used to signal a cabin crew emergency on some aircraft?

• A. Cabin pressurization warning
• B. Emergency alarm button
• C. Interphone emergency button
• D. Smoke detection signal

Answer: (B)

The emergency alarm button is specifically designed to signal a cabin crew emergency on certain aircraft. This button enables the flight crew to alert cabin crew members instantly regarding a critical situation that requires their immediate attention. Activation of this button typically results in an audible alert or visual indication, allowing the cabin crew to respond to emergencies, such as medical issues or security threats, effectively and efficiently.

In contrast, other options may indicate specific issues but do not serve the primary function of signaling a cabin crew emergency. For instance, a cabin pressurization warning is related to cabin pressure levels, an interphone emergency button typically facilitates communication rather than alerting of an emergency, and smoke detection signals focus specifically on smoke presence rather than serving as a general emergency alert. Therefore, the emergency alarm button stands out as the appropriate command for signaling a cabin crew emergency.