Hydraulic actuators rely on expensive scheduled maintenance to assure mission-critical performance. The Wireless Hydraulic Actuator Monitor (WHAM) will monitor the actual condition of the actuator and connected valves, allowing both condition-based maintenance and predictive health maintenance (CBM/PHM) of the actuators, saving time and manpower and providing assurance of operation. International Electronic Machines is experiencee in wired and wireless sensor development for transportation systems safety, maintenance, and security. Target platforms for WHAM are the Virginia-Class and Ohio Replacement submarines (PMS 450 and PMS 397). Phase I test and demonstrations have proven the feasibility and practicality of this project. IEM is seeking to integrate this technology with actuators and with onboard wireless systems to provide seamless installation of this monitoring capability.