Monitor the availability, use, or condition of lifesaving equipment or pollution preventatives to ensure that international regulations are followed. Monitor engine, machinery, or equipment indicators when vessels are underway and report abnormalities to appropriate shipboard staff. Maintain electrical power, heating, ventilation, refrigeration, water, or sewerage systems. Record orders for changes in ship speed or direction and note gauge readings or test data, such as revolutions per minute or voltage output, in engineering logs or bellbooks. Perform or participate in emergency drills, as required. Maintain complete records of engineering department activities, including machine operations. Start engines to propel ships and regulate engines and power transmissions to control speeds of ships, according to directions from captains or bridge computers. Monitor and test operations of engines or other equipment so that malfunctions and their causes can be identified. Maintain or repair engines, electric motors, pumps, winches, or other mechanical or electrical equipment or assist other crew members with maintenance or repair duties. Perform general marine vessel maintenance or repair work, such as repairing leaks, finishing interiors, refueling, or maintaining decks. Operate or maintain off-loading liquid pumps or valves. Clean engine parts and keep engine rooms clean. Supervise the activities of marine engine technicians engaged in the maintenance or repair of mechanical or electrical marine vessels and inspect their work to ensure that it is performed properly. Order and receive engine room stores, such as oil or spare parts, maintain inventories, and record usage of supplies.