Chapter 1 Introduction To  Weight-Shift Control Introduction Weight-shift control (WSC) aircraft means a powered aircraft  with a framed pivoting wing and a fuselage controllable only  in pitch and roll by the pilot’s ability to change the aircraft’s  center of gravity (CG) with respect to the wing. Flight control  of the aircraft depends on the wing’s ability to deform fl exibly  rather than on the use of control surfaces. This chapter provides background on the development of the  WSC aircraft, its unique characteristics, the requirements for  obtaining a WSC license (airman certifi cate), aeronautical  decision-making (ADM), and the unique medical factors  required to operate WSC aircraft safely. Further, it is highly  recommended that all pilots develop a general understanding  of aviation by becoming familiar with the Pilot’s Handbook  of Aeronautical Knowledge and the Aeronautical Information  Manual (AIM). Listings of other available handbooks can be  found on the Federal Aviation Administration (FAA) website  at www.faa.gov.