Which of the following documents must include the required crewmember functions during emergencies as per regulations?

The document that must include the required crewmember functions during emergencies as per regulations is the certificate holder's manual. This manual is a comprehensive document that outlines the policies, procedures, and operational guidelines for the organization operating the aircraft. It is mandated by aviation regulations to ensure that all aspects of operations, including emergency procedures, are documented and accessible to crewmembers. This ensures that in the event of an emergency, the crew is aware of their specific roles and responsibilities, thus reinforcing safety and operational efficiency.

While the Pilot's Emergency Procedures Handbook and the Operating Manual may contain valuable information regarding emergencies, they typically focus on specific aspects of operations, such as pilot responsibilities or aircraft operation procedures. However, the certificate holder's manual serves as a centralized resource that encompasses all regulatory requirements for crew roles in emergencies, making it essential for compliance with aviation standards.