Examine and inspect aircraft components, including landing gear, hydraulic systems, and deicers to locate cracks, breaks, leaks, or other problems. Conduct routine and special inspections as required by regulations. Inspect completed work to certify that maintenance meets standards and that aircraft are ready for operation. Read and interpret maintenance manuals, service bulletins, and other specifications to determine the feasibility and method of repairing or replacing malfunctioning or damaged components. Maintain repair logs, documenting all preventive and corrective aircraft maintenance. Modify aircraft structures, space vehicles, systems, or components, following drawings, schematics, charts, engineering orders, and technical publications. Inspect airframes for wear or other defects. Measure parts for wear, using precision instruments. Obtain fuel and oil samples and check them for contamination. Maintain, repair, and rebuild aircraft structures, functional components, and parts such as wings and fuselage, rigging, hydraulic units, oxygen systems, fuel systems, electrical systems, gaskets, and seals. Replace or repair worn, defective, or damaged components, using hand tools, gauges, and testing equipment. Read and interpret pilots' descriptions of problems to diagnose causes. Test operation of engines and other systems, using test equipment such as ignition analyzers, compression checkers, distributor timers, and ammeters. Measure the tension of control cables. Spread plastic film over areas to be repaired to prevent damage to surrounding areas. Remove or install aircraft engines, using hoists or forklift trucks. Assemble and install electrical, plumbing, mechanical, hydraulic, and structural components and accessories, using hand or power tools. Locate and mark dimensions and reference lines on defective or replacement parts, using templates, scribes, compasses, and steel rules.