What is particularly useful to ground crew members if the communication channel with the pilot is lost?

The Standard Operating Procedures Document is particularly useful to ground crew members if communication with the pilot is lost because it contains essential guidelines and protocols for various operational scenarios, including emergencies. This document typically outlines the steps to take for safety, emergency responses, and how to handle situations when communication fails.

In the absence of live guidance from the pilot, ground crew members can refer to these procedures to ensure that they are acting within the established safety protocols and maintaining operational integrity. This can involve instructions on how to safely land the aircraft, manage chemical applications, or evacuate the area if necessary.

Other references, such as equipment manuals and weather reports, while valuable in their own right, do not provide immediate operational guidance in the context of lost communication. An emergency contact list is also important, but it pertains more to reporting incidents rather than guiding day-to-day operations or emergency directives.