LSA. In addition, the regulations governing the sport pilot rule  define the training requirements of prospective sport pilots  and the airworthiness requirements for their machines. For  instance, an ultralight vehicle must not exceed 254 pounds  or carry more than one person. Aircraft that carry more than  one person and weigh over 254 pounds but less than 1,320  pounds may be certified as LSA provided they meet specifi c  certification requirements. Therefore, many WSC ultralight  vehicles became LSA (provided they were properly inspected  and issued an airworthiness certificate by the FAA). WSC aircraft are single- and two-place trikes that do not meet  the criteria of an ultralight vehicle but do meet the criteria of  LSA. The definition for WSC can be found in 14 CFR part 1.  Flight control of the aircraft depends on the wing’s ability to  flexibly deform rather than on the use of control surfaces. The common acronyms for this LSA are WSC (weight-shift  control); WSCL (WSC land), which can be wheels or ski  equipped; and WSCS (WSC Sea) for water operations. A  LSA WSC used for sport and private pilot flying must be  registered with a FAA N-number, have an airworthiness  certificate, a pilot’s operating handbook (POH), and/or  limitations with a weight and loading document aboard. The  aircraft must be maintained properly by the aircraft owner  or other qualified personnel and have the aircraft logbooks  available for inspection. Dual flight controls are required in  two-seat aircraft used for training. The carriage is comprised of the engine and fl ight deck  attached by a structure to wheels, floats, or skis; it may also  be referred to as the fuselage. The wing is the sail, structure  that supports the sail, battens (ribs) that form the airfoil, and  associated hardware.  [Figure 1-13] There are several unique features of the WSC aircraft: •  The wing structure is in the pilot’s hands and is used  to control the aircraft. There are no mechanical devices  between the pilot and the wing. The pilot can directly  feel the atmosphere while flying through it because the  pilot is holding the wing. This is a direct connection  between the wing and the pilot like no other aircraft. •  The pilot can feel the wing as the wingtips or nose  moves up and down, but the carriage and passenger  are more stable. Turbulence is not felt as much as in  a fi xed-wing aircraft. •  Different wings can be put on a single carriage. This  allows the pilot to have a large wing that can take off  in short distances, which would be good for low and  slow flying. A large wing with a lightweight carriage  can also be used for soaring and is capable of fl ying  at speeds below 30 miles per hour (mph). At the other  extreme, a smaller high performance wing can be  used for flying long distances at high speeds. With a  small wing and a larger motor, WSC aircraft can fl y  at speeds up to 100 mph. •  The wing can be taken off the carriage and folded up  into a tube that can be easily transported and stored.  This allows owners to store the WSC aircraft in a  trailer or garage, transport the WSC aircraft to a local  site, and set it up anywhere.  [Figure 1-14]   Weight-Shift Control Aircraft Carriage Wing Figure 1-14. Wing folded and on top of a recreational vehicle with  the carriage in a trailer. Figure 1-13. Carriage and wing of a WSC aircraft. 1-7