P A P E R III Category X : Variable Pitch Propellers ___________________________________________________________ Knowledge of the principle of thrust producing characteris- tics of propellers. Knowledge of the construction and functioning of all types of VP propellers and its components. Detailed knowledge of the methods of carrying out overhauls and repairs to VP Propellers. Detailed knowledge of the inspections necessary to detect defects, as a result of wear and deterioration and the permissible allowances in each case. Knowledge of the inspection of components/ parts of VP propellers. Knowledge of the equipments/ instruments/ test-bed required for testing the VP propeller and associated systems; and detailed knowledge of the methods/ procedures employed in carrying out the functional/ serviceability tests of the VP propellers and associated systems after repair and overhaul. Knowledge of the selection and inspection of materials used in the construction, repair and overhaul of VP propellers and associated systems. Detailed knowledge of the inspection of a complete propeller for correct assembly, adjustment, weight and balance; meth- ods employed for correcting balance and checking torque loading of blades. Knowledge of the installation of a propeller to an engine; check testing and adjustment for performance and correction of faults.