A decision was made early in the program to have the thrust acting close to the center of gravity to minimize pitch changes with power and the consequential effects on adverse handling qualities and certification requirements. This engine location design element avoids the requirement to develop an automatic trim system to deal with the issues of power-pitch coupling. While such systems have been proposed for other aircraft, none has yet been certified on this category of aircraft.
A single engine jet has many advantages over a twin engine jet. However it poses the question of the optimum location for engine placement.
The general aircraft layout including engine placement is referred to as "configuration". Early in the program, considerable time was spent studying various configurations prior to settling on bifurcated inlets with the engine mounted centrally in the fuselage. This was primarily the result of three considerations:1. Thrust Line vs. Center of Gravity