Abstract: An energizing and functional exercising apparatus for use with a variable pitch aircraft propeller in a maintenance shop environment is disclosed. Use of the apparatus enables functioning and performance check-out of an overall propeller assembly while the assembly is mounted on a cradle received engine in a hanger or maintenance shop and without requiring use of the aircraft or exposure of maintenance personnel to inclement weather. The disclosed apparatus provides electrical energization and control of the hydraulic system received within the propeller assembly and additionally provides check-out of sensing functions contained within the propeller assembly. Latched energization of the blade driving apparatus until a predetermined blade position is obtained and remote control of the blade movement operation are incorporated features of the disclosed apparatus.