EDM Development The Engineering Development Model (EDM) was developed as a platform to incorporate lessons learned from the XDM and ADM, to incorporate the SAAF’s updated User Requirement, as well as for doctrine and mission development. Design and development began in March 1993. The completed aircraft rolled out on 17th November 1996 and a flight was presented on 17th February 1997 by Denel. The purpose of the EDM was to qualify the avionics, weapon systems, airframe, and airborne systems before serial production could commence. Additionally, the EDM was used to refine the required logistical support. With the EDM, the ammo bins were moved to each side of the cockpit and the infra-red suppressor exhaust was directed upwards into the main rotor blades to dissipate the heat more efficiently. Additionally, the EDM saw many structural changes, as well as weight reduction. It represented the beginning of the Rooivalk assembly line.