Militärakademie für Ingenieure der Luftstreitkräfte „Prof. N. J. Schukowski“
At 1935 Lyapidevsky returned to the Army. At 1939 he graduated from Department of Engineering of Zhukovsky Air Force Engineering Academy. Beginning in 1939, he was deputy of the head of the Main Inspectorate of People's Commissariat of Aviation Industry and head of Aviation Factory No.156 (Moscow, after October 1941 – Omsk).