Human Performance and Limitation

AME is part of maintenance system  have certain capabilities and limitations that.  It is  useful to have an understanding of how various parts of his body and mental processes function and how performance limitations can influence his effectiveness at work
Human Performance is likely to degrade and eventually ‘fail’ under certain conditions. 
Physically, humans become fatigued, affected by the cold, can break bones.
Mentally, humans can make errors, have limited perceptual powers, can exhibit poor judgement due to lack of skills and knowledge, etc. 
Human performance is also affected by social and emotional factors. Failure by aircraft maintenance engineers can also be to the detriment of aircraft safety.
Vision - Anatomy of the Human eye.
Factors Affecting Clarity of Sight- An individual with an acuity of 20/20 vision should be able to see at 20 feet that which the so-called ‘normal’ person is capable of seeing at this range. It  may be expressed in metres as 6/6 vision. The figures 20/40 mean that the observer can read at 20 feet what a ‘normal’ person can read at 40 feet.
Hearing - The ear performs two quite different functions.  
              1. detect sounds by receiving vibrations in the air, 
              2.responsible for balance and sensing acceleration. 
Anatomy of Ear - Ear has three divisions: outer ear, middle ear and inner ear. 
             These act to receive vibrations from the air and turn these signals into nerve impulses that the brain can recognize as sounds.
Information Processing - Process of receiving information through the                                                     senses,  
                         analysing it and 
                         making it meaningful.

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