The following report presents the undercarriage drag predictions for the retractable landing gear of the BAE Jetstream 31, operated by the National Flying Laboratory Centre (NFLC) at Cranfield University.A model of the landing gear was incorporated tothe laser scanned model of the aircraft, and Computational Fluid Dynamics (CFD) techniques were used to measure the undercarriage drag. These results are compared to the flightexperiments and empirical methods, and the CFD drag predictions are just below the prediction intervals for small angles of attack. Due to the flow field and lack of the propellers more discrepancies are observed in lift and drag at higher angles of attack.