What document should be referenced to determine if a piece of equipment can be deferred under the MEL?

To ascertain if a piece of equipment can be deferred under the Minimum Equipment List (MEL), the correct document to reference is the Procedures Document. The Procedures Document contains specific guidelines and protocols that outline how to handle equipment malfunctions and deferred maintenance items in compliance with the MEL. This document is essential as it provides detailed instructions on the conditions and limitations associated with deferrals, ensuring adherence to regulatory requirements while maintaining safety.

The other options, while relevant in their contexts, do not specifically address the deferral process under the MEL. For instance, 14 CFR Part 91 outlines regulations for general aviation but does not provide the operational procedures required for MEL deferrals. The Kinds of Operations List (KOL) is useful for determining the operational categories of the aircraft but does not offer procedural guidance. Lastly, the Maintenance Manual contains technical information about the maintenance and repair of the aircraft but lacks the specific procedures necessary for deferring items per the MEL. Thus, referencing the Procedures Document is critical for proper adherence to deferral policies.