Transdigm Group Incorporated operates in the Aircraft parts and equipment sector. TransDigm Group Incorporated (TD Group) is a global designer, producer and supplier of highly engineered aircraft components for use on commercial and military aircraft. It operates through its wholly owned subsidiary, TransDigm Inc. (TransDigm). It primarily designs, produces and supplies engineered aerospace components (and certain systems/subsystems). On September 25, 2010, TD Group entered into a definitive agreement (the Purchase Agreement) with McKechnie Holdings LLC to purchase all of McKechnie Aerospace Holdings, Inc. (McKechnie), a supplier of aerospace products controlled by JLL Partners Inc. On September 3, 2010, TransDigm Inc. completed the acquisition of Semco Instruments, Inc. In December 2010, it acquired McKechnie Aerospace Holdings Inc. In March 2011, it completed the divestiture of its fastener businesses to Alcoa Inc. In April 2011, it sold Aero Quality Sales (AQS) to Satair A/S. In December 2011, it acquired Harco Laboratories, Incorporated. In our complete report available for purchase the company is compared to: Ducommun Incorporated, HEICO Corporation and AAR Corp..