This document specifies those requirements and procedures for periodic for periodic tests to insure maintenance of balance machine capabilities for balancing jet engine components. It will specify: (a) Requirements for tests (b) Calibration tests (c) Residual unbalance and accurate angle and amount indication tests (d) Plane separation test (e) End-drive system unbalanced disturbance test PURPOSE To define a standard method for the Periodic Surveillance of Horizontal Dynamic Balancing Machines.