Pratt & Whitney Canada PW500 active business-aviation turbofan family spanning three series and eight models in the 2,900–4,500 lbf class. Pratt & Whitney identifies PW545D as the latest derivative and current support fleet; MTU Aero Engines records a 25 percent development and manufacturing share in the family since 1993. Exact PW535/PW545 series variants and aircraft installations remain separate identities.