A Simple Adaptive Scheduling Mechanism for Planning Base Level Inspections.

by Louis W. Miller

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Describes a simple and promising improvement over the two systems now used for scheduling aircraft into base-level inspections. Both the periodic concept (hours flown between inspections are held constant) and the isochronal concept (calendar time held constant) have undesirable traits because aircraft accrue flying hours irregularly over time. The solution presented here comprises two steps: (1) Over a long period (perhaps a fiscal quarter), fix the dates on which inspections will begin (perhaps weekly). (2) Divide the period into smaller intervals (perhaps two weeks) and before each interval, schedule those aircraft that have flown the most since their last inspections. Step 1 smooths the flow of work into the docks. Step 2 controls the variability of flying hours between inspections. A computer simulation is described which estimates SASM distributions of flying-hour and calendar-time intervals for the C-141. The experiment affirms that the SASM retains the desirable traits of both current systems. (See also R-755.) 48 pp. Bibliog.

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