What action must be taken if a flight crew member has not checked in within 5 minutes after the scheduled report time?

The correct action that must be taken if a flight crew member has not checked in within five minutes after the scheduled report time is to contact the crew scheduling supervisor. This procedure ensures that any potential issues with the flight crew's availability are promptly addressed. The crew scheduling supervisor is responsible for managing crew assignments and can determine the appropriate next steps to ensure that the flight is adequately staffed. Reporting the situation to the supervisor allows for efficient handling of the circumstance, whether that means locating the absent crew member or making alternative arrangements to maintain operational efficiency.

In this context, checking in via CrewTrac is not a suitable action after the designated report time has passed, as this could further delay necessary responses. Similarly, notifying the captain directly may not be the most efficient initial step, considering that the scheduling supervisor typically has the authority and resources to take appropriate action regarding crew availability. Preparing for ground duties is also not relevant without first attempting to ascertain the crew member's status through established communication channels such as the crew scheduling supervisor.