HSA E.7 Hornero is a Lisenian advanced trainer aircraft built by HSA in the early 1950s. The aircraft entered service with Lisenian Air Force and Lisenian Navy and was in service until they were replaced by Beechcraft T-34 Mentor on 1970s. By the early 1950s, the Lisenian Air Force and Navy's training aircraft fleet was composed of several obsolete pre-war and WWII types. As a result, the HSA company began a private venture program to develop an advanced piston engine trainer to serve both services. The E.7 Hornero combined an all-metal structure with a well-proven engine. The resulting aircraft was simple, affordable and easy to maintain. Most importantly, the E.7 provided good performance and vice-free handling. Several subvariants were developed, including a naval variant with strengthened airframe and arresting gear, and a weapons training/COIN variant which saw combat service in Southeast Asia. The Hornero served in the training role until begin eventually replaced by the Turbo-Mentor in the 1970s. Apart from training naval aviators, the E.7 was also used for target towing, weapons testing, and many were converted into drones for air defense training. The surviving aircraft are very popular on the civilian market and on the warbird circuit.