AIRCREW RATIO STUDIES: A CONTINUATION,
Abstract
A probability model was developed for aircrew ratios that accounts for unscheduled as well as scheduled sorties. Considered are factors of aircraft and crew utilization, reserve crew requirements, and unscheduled sortie requirements. A Poisson distribution is assumed for the number of unscheduled sorties and a probability distribution is assumed for the number of planes per sortie. Formulas are derived for the number of scheduled flights during the flying period, for a generalized crew ratio, for the additional crews expected to be scheduled, and for variance in number of additional crews. A JOSS program is given for calculating aircrew ratios based on the model. The basic parameters are: (1) sortie rate per day per aircraft; (2) proportion of time a crew is scheduled to fly; (3) proportion of time a crew is scheduled in reserve. Tables are provided for determining the crew ratios when these parameters are varied. It can be concluded from the model that crew ratios increase as (1) the proportion of unscheduled sorties increases, (2) crew unavailability increases, and (3) sortie rates increase. Also, reserve crew scheduling affects crew sensitivity when the reserve scheduling proportion is relatively high. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Dec 01, 1968
- Accession Number
- AD0680763
Entities
People
- Alan J. Gross
- William W. Hogan Jr
Organizations
- RAND Corporation