The resulting engine had better high-altitude performance and entered production in 1938. However, the engine proved unreliable and suffered from failure of gears in the reduction gearbox. Later the M-88 was designed to address the shortcomings of the M-87.
In 1938, an improved engine with better high-altitude capabilities began production. Unfortunately, this engine had reliability issues and gear failures in its gearbox. To address these concerns, the M-88 design was created to improve upon the shortcomings of the M-87.