The Impact of ATTCS on Reduced-Thrust Takeoff Field Performance

This paper explores the interplay between the five regulations (14 CFR § 25.105, 14 CFR § 25.107, 14 CFR § 25.109, 14 CFR § 25.113, and 14 CFR § 25.121) and their interactions with two other regulations: 14 CFR § 25.149 and 14 CFR § 25.904. Together, these laws control the means by which the takeoff runway requirements of transport category aircraft are computed. Inspection of airline pilot manuals indicate the popularity of “reduced thrust” or “flex-temp” takeoff procedures that are not discussed in popular aircraft design texts. This paper documents the design and certification implementation strategies that the designer should take when including de-rated thrust takeoff procedures and alternative decision speed strategies into the aircraft conceptual design process.