I've found many examples of ways to write the materials required as COA application attachments (e.g. Communication). Is there a checklist of requirements to follow for each attachment?

The COA application requires a minimum of 5 attachments as follows:

1. The public declaration letter that declared the public agency's public aircraft status;
2. An airworthiness statement from the agency's accountable executive declaring the UAS(s) they are operating is airworthy and that they will maintain an airworthiness program;
3. A lost link document for each UAS that explains the loss of link protocol for the UAS;
4. A loss of communication document that describes the loss of communication between the Remote Pilot in Control (RPIC) and their observer, and the loss of communication between the PIC and air traffic control if that is required; and
5. An emergency procedures document that lists the different emergencies an operation may have and how the public agency will respond to such emergencies.

Still can't find what you are looking for? Please feel free to contact the UAS Support Center for general questions and comments.