Emulation of Radius-to-Fix legs in Departure Routes via Fly-By Turns

• Main Authors: Carlos GONZAGA-LOPEZ, Florian Michael BUCHMANN, Henrik EKSTRAND, Andreas LINNÉR, Philipp Daniel SCHAAD
• Format: Article
• Language: English
• Published: National Institute for Aerospace Research “Elie Carafoli” - INCAS 2019-12-01
• Series: INCAS Bulletin
• Subjects: radius-to-fix (rf); standard instrument departure (sid); multiple-tf turn (mtt); track adherence; fly-by
• Online Access: http://bulletin.incas.ro/files/gonzaga-lopez_buchmann_ekstrand_linner_schaad_vol_.pdf

The results of a preliminary study on the emulation of radius-to-fix legs in turning departures by means of standard track-to-fix legs are presented in this technical note. While radius-to-fix equipage rates keep gradually increasing over time, a traffic mix containing aircraft with and without this navigation capability can impede an optimal management of the traffic flows whenever precise and repeatable curved flight paths are required. After test-flying various sequences of track-to-fix segments to emulate a reference constant-radius arc in a typical departure environment, the deviations to the desired flight path and the flyability aspects were assessed. The first results for a given scenario and aircraft type show an adequate path conformance for a navigation specification RNAV/RNP 1 within a certain range of aircraft performances and weather conditions. However, the reduced predictability of the roll steering when transitioning between track-to-fix segments and the high frequency in the oscillations of the bank angle may pose a problem to flight crews and passengers, respectively.