Ateliers mathématiques au cycle des apprentissages premiers by Collectif

By Collectif

Livre pédagogique pour le préscolaire et los angeles maternelle.
4-5 ans Moyenne part.

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In cases where physical effort is required to operate controls, ergonomics has established rules which enable people to supply the effort with a minimum of fatigue. These rules lay down, for instance, that it is uneconomical to underload large muscles and dangerous to overload small ones; that however perfect a machine may be, it is not correctly designed if only an athlete or contortionist can operate it; and that needless fatigue must always be avoided. Some of these rules may seem obvious, but are nevertheless often overlooked.

In addition it must be possible for the test gear to be easily and safely positioned when in use, within comfortable manual and visual range. Test indicators should be as simple as possible. For instance, if only a 'Satisfactory-Not Satisfactory' indication is needed, the use of a lamp or buzzer is better than a meter. If a gauge or meter must be read, the dial should be as simple as possible and not capable of being read to a greater accuracy than the test requires. In more sophisticated types of special test equipment it may be desirable to incorporate some form of quick check to show that the equipment is functioning normally.

Tyres, brakes, steering, lighting and lubrication fluids are often checked at a service interval (check cycle) of 4500, 5000 or 6000 miles. Clutch, gearbox, transmission, and other major items may be checked at a longer service interval (check cycle) of either 9000, 10 000 or 12 000 miles. 1. 1 Boeing 747 check cycles Check type Flying hours Calendar days Landings Service I Service 2 Intermediate Major 1 060 2 120 6 360 24 000 85 160 500 1825 160 320 900 3800 52 An Elementary Guide to Reliability Mean time to repair The MTBF is a measure of the likelihood that an equipment will break down in a given period, but it is also necessary to know how long it will be out of service for maintenance and repair.

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