Noise

Noise - any unwanted sound, especially if it is loud, unpleasant and annoying.
Noise in  the workplace can have both short-term and long-term negative effects: 
                it can be annoying, 
                can interfere with verbal communication and mask warnings,
                and it can damage workers’ hearing (either temporarily or permanently).
 Ear is sensitive to sounds between 20 HZ to 20 KHz.
 Intensity of sound is measured  in decibels (dB), 
Exposure in excess of 115 dB without ear protection even for a short duration is not recommended. 
This equates to standing within a few hundred metres of a moving jet aircraft.
General background noise can be ‘filtered out’ by the brain through focused attention.  
Hearing protection  Devices - HPD - ear plugs and ear muffs  - to help the engineer to concentrate.
Canal Cap -intermitted noise exposure
 Noise environment in which the AME works can vary considerably. 
 It is not unusual for this to exceed 85 dB - 90 dB which can cause hearing damage if the time of exposure is prolonged. 
The hangar area can also be noisy, usually due to the use of various tools during aircraft maintenance. 
Short periods of intense noise are not uncommon here and can cause temporary hearing loss.
 Engineers may move to and from these noisy areas into the relative quiet of rest rooms, aircraft cabins, stores and offices.

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