The AISA I-115 is a low-wing single-engined military primary trainer with tandem seating, which went into service with the Spanish Air Force in 1956.
The AISA I-115 was a military development of the single-engined side-by-side seat I-11 which first flew in 1951.
This aircraft was designed by Iberavia but built by AISA; later, Iberavia were taken over by AISA.
The I-115 inherited the tail wheel undercarriage of the production version of the I-11, the I-11B, but was a longer machine because the Spanish Air Force wanted tandem seating for its trainers, had a slightly greater span and was considerably heavier.
These changes called for more power, so the I-115 used a 112 kW (150 hp) ENMA Tigre inverted in-line engine.
Like the I-11 the I-115 had an all wood structure and most surfaces were plywood covered apart from fabric covered ailerons and flaps.
The low, tapered, straight edged and square tipped wings had two spars and stressed plywood skin. Wing dihedral was 6°.
The ailerons were differentially operated and drooped when the slotted flaps were lowered.
The vertical stabilizer was almost rectangular and carried a balanced rudder.
The horizontal tail surfaces were more tapered, the elevators balanced and carrying trim tabs.
The fuselage was a wooden monocoque.
The tandem cockpits were enclosed with a long, glazed cover with independent sliding sections for both instructor and pupil.
Dual controls and instrumentation included provision for blind flying.
The undercarriage was fixed and unfaired, each main wheel carried on a single exposed leg.
The main wheels had brakes and the tail wheel was steerable.