The performance of navigation and attitude or heading indication of inertial systems is directly influenced by the metrological quality of the accelerometers and gyroscopes used for supplying information to the servo controlled systems. This thesis presents a methodology for estimating the metrological confidence level of servo controlled pendular accelerometer and dry tuned gyroscope parameters. This thesis also presents a methodology for calculating the uncertainty envelope of inertial system parameters as a function of time when submitted to a dynamic profile. Based on these studies the Navy Research Institute Inertial Laboratory will be able to provide detailed test report on the inertial systems. The methodologies that were developed in this thesis will help design people to achieve a better performance when a typical dynamic profile is applied to an inertial system.