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In view of comparatively higher landing frequencies expected in operation of short range jets, analysis of costs by a measure other than flying hours are a necessity. Turbojet and turboprop systems are compared in terms of logical exposure to usage, and cost per landing are found to be most meaningful for several systems, which are further analyzed. Because the landing gear system costs were found to be greatest in magnitude of the airframe sytems, these are reviewed in some detail. While good progress in brake cost reduction has been achieved further developments in wheel design toward reduced cost are in order, and considerable emphasis is needed on tires, which account for half of all landing gear costs.

The use of personal protective equipment (e.g., gloves, boots, apron, slicker suits) have been used for many years to protect employees from toxic chemicals. The scientific development over the last few years has been established to assist employers in choosing the best available protective equipment to protect the employee. There are recommended guidelines to develop a program in the selection, use, and employee training of this equipment to meet the employer's needs for normal and everyday use. This paper does not address emergencies.