This document provides the minimum operational, Safety and Performance Requirements (SPR) and Interoperability Requirements (INTEROP) to implement Airborne Spacing (ASPA) - Flight Deck Interval Management (FIM) in support of an identified set of operational scenarios. ASPA-FIM is defined as the flight deck component of a larger Interval Management (IM) System. It defines and allocates the set of minimum requirements for the end-to-end operational, safety, performance, and interoperability aspects for implementations of an initial set of IM Operations. The document was developed jointly by ADS-B Requirements Focus Group (RFG) within RTCA Special Committee 186 and EUROCAE Working Group 51.