Electronic Flight Rules (EFR)-A Concept for Enhanced Freedom of Airspace

A new control procedure for aircraft operations, termed Electronic Flight Rules (EFR), is proposed as a means of achieving the flexibility and cost advantages of Visual Flight Rules under instrument meteorological conditions. EFR depends on the electronic determination of relative aircraft position by ground-based or airborne equipment, and provides automatic assistance to pilots in resolving conflicts. When not in potentially conflicting situations, aircraft flight paths are not constrained by air traffic control.