Identify one emergency procedure for elevator entrapment.

Using the emergency communication system to contact help is the most appropriate emergency procedure for elevator entrapment. This system is specifically designed to connect passengers trapped inside an elevator with emergency responders or building management. It ensures safety by providing a direct line of communication, allowing trained professionals to assess the situation and send assistance as needed. This method is essential because it prevents the entrapment situation from worsening and reduces the risk of injury that might result from other attempted escape methods.

In contrast, attempting to exit through the ceiling hatch may pose significant risks, such as falling or getting stuck, and is typically not recommended unless explicitly instructed by emergency personnel. Forcing the doors open can lead to dangerous conditions, including potential harm from the elevator moving unexpectedly or electrical hazards. Similarly, signaling for help with a flashlight might not guarantee that help will arrive promptly, especially if the response mechanisms in place—like the emergency communication—are thoroughly established to ensure swift assistance. Thus, using the communication system is the safest and most effective procedure in the event of an elevator entrapment.