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2. operating position.) Study on level 3) The average monthly income of 4). 5.) the length of time working in the company. The task group, task 1.2: 1 aircraft wing structure groups employees) (Wing Group). Structural Group employee, 2), trunk (Floor Group) aircraft. 3) employees, passengers and crew rooms (Cabin Group). 4) electrical system to help employees of aircraft (IERA Group). 2. the variable is the main security forces strengthen employees ' repair (2 aircraft), flight engineer, company director Thailand public company limited. 2.1 engineering 2.2 education 23. the issue 1.5.3 scope of the population and sample Employees who perform routine repair force (2 aircraft), flight engineer, company director Thailand limited number of 170 people (large aircraft repair Division 2 at 2557 December 16), the only male employee because there is not a female operating. A sample of this storage is a fund the repair job, the operating employees (2 aircraft), flight engineer, company director Thailand public company limited from 4 groups: employees, aircraft wing (Wing) aircraft floor (Floor), employees, employees, groups of aircraft passenger room (Cabin) and an electric system to help the aircraft (IERA) basis size, a sample of the finished table is used by the khret and Morgan (Morgan & Krejcie, 1970) that 95 per cent confidence level has a sample number of 118 people using a multiple-stage sampling (Multi-Stage Random Sampling). 1.5.4 time scope. A study of the 2557 starting from December-March, 2558.1.6 the definition used in the study. 1.6.1 primary strengthen security means to control the causes will result in or cause an accident. The environment is the cause of the accident, including why is caused by people. The cause of the crash from the machine and cause damage to nature from operations, including specialized aircraft have fallen accidentally in the prevention of injury from work until he was injured in the collision, was a sharp drop or shock the device's purge advance trauma and injury, deep in the muscle system. As a result, employees have been injured. As a result of damage, both direct and indirect company. Thailand aviation limited 1. engineering refers to the use of the Department of engineering science. To calculate the safest decision criteria to perform aircraft maintenance, as well as evaluating.
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