This paper presents new results of a flight test of the L1 adaptive control architecture designed to directly compensate for significant uncertain cross - coupling in nonlinear systems . The flight test was conducted on the subscale turbine powered Generic Transport Model that is an integral part of the Airborne Subscale Transport Aircraft Research system at the NASA Langley Research Center . The results presented include control law evaluation for piloted offset landing tasks as well as results in support of nonlinear aerodynamic modeling and real - time dynamic modeling of the departure - prone edges of the flight envelope .