After it was decided to put the CI-32L out of service, the possibility of a motorized anti-aircraft gun was investigated. Following the testphase in 1942, were some of the CI-32L were upgraded with the 20mm AA-gun, a first batch of 80 vehicles were ordered.
Part of the hull and the tower was removed, in order to have enough room for the gun. Ammunition was carried in a trailer or a separate vehicle.
AAT-1
Anti-Aircraft Tank
Weight: 5,5t
Crew: 4 men
Length / Width / Hight 4,02 m / 2,06 m / 2,08 m
Speed: 40 km/h
Engine: 60 PS
Armament: 1 x 20mm AA-Gun L/55
Armor: 13 mm