Maintaining and repairing gas turbine engines and auxiliary equipment; working with blueprints, schematics and charts; performing administrative procedures related to gas turbine propulsion system operation and maintenance; performing work area inspections; testing lubricating oil and distillate fuels forcontamination, neutralization and precipitation; operating standard test equipment; stopping engines and checking proper performance; replacing and adjusting operating tolerance of contacts, microswitches, relay switches, pressure switches and temperature switches; operating electric plant control and main propulsion equipment; operating pumps, turning gear, air compressors, oil purification system, low pressure air dehydrators and engineering control systems; performing preventive maintenance on ship's fuel system and air system; maintaining sea water service system, waste drain system, oil purification system and manually operated valves; using hoisting and lifting devices and maintaining special tools.Maintaining and operating ship's service gas turbine generators and support systems; maintaining and controlling ship's service steam water chemistry; maintaining the controllable pitch propeller system.