In what situation is the use of a Quick Reference Guide most appropriate?

The use of a Quick Reference Guide is most appropriate in non-normal situations because these guides are designed to provide essential information and procedures quickly and efficiently. Non-normal situations can involve emergencies or unexpected events that require immediate action from the crew. The Quick Reference Guide is structured for rapid access to critical checklists and operational procedures, allowing pilots to respond effectively under time pressure and with limited resources.

In contrast, regular training exercises often allow for more in-depth learning and reference to comprehensive manuals or materials. When educational materials are lacking, the reliance on a Quick Reference Guide may not be sufficient because it does not provide the comprehensive context needed for proper understanding. Additionally, at cruising altitude, the focus is typically on routine operations where in-depth knowledge and procedures are already well-integrated into the flight plan, thus reducing the immediate need for a Quick Reference Guide.