MIL-HDBK-516A, DEPARTMENT OF DEFENSE HANDBOOK: AIRWORTHINESS CERTIFICATION CRITERIA (5 FEB 2004)., This document establishes the airworthiness certification criteria to be used in the determination of airworthiness of all manned and unmanned, fixed and rotary wing air vehicles. It is a foundational document to be used by the single manager, chief engineer, and contractors to define their airworthiness certification basis.