This may mean that they sometimes work in unpleasant and extremely hot weather. This is especially true at airports where repairs are made quickly in order to maintain schedules. Mechanics are occasionally exposed to electrical shock, working with explosives, and other environmental conditions. Helicopter mechanics often spend weeks or months away from their home bases. Hangars tend to be very noisy.
Mechanics wear ear protection when engines are being tested or riveting is being done.
They are sometimes exposed to fumes, noxious odors, or dust that may affect their lungs, eyes, or skin. They may also be exposed to toxic or caustic chemicals. Occasionally mechanics work in close proximity to moving mechanical parts. They often stand on tall ladders or scaffolds. Mechanics generally work 40 hours per week, although is overtime is frequent.