Primary Flight Display Symbols
Econ Speed Range
The Econ Speed Range appears in magenta when: in the DES phase of flight, speed is managed, and the DES FMA is annunciated (NAV required).
Provides a range of up to ± 20 knots of target speed, limited by VMAX as an upper limit and the greater of green dot, S, F, or VLS as the lower speed limit.
If a speed limit or constraint exists, the range is +5/-20 knots of target speed. Minimizes thrust variations while maintaining the VNAV descent profile. Target speed is either the auto speed entered in the PERF DES page or ECON descent speed.