Estimating the Effects of the Terminal Area Productivity Program

The report describes methods and results of an analysis of the technical and economic benefits of the systems to be developed in the NASA Terminal Area Productivity (TAP) program. A runway capacity model using parameters that reflect the potential impact of the TAP technologies is described. The runway capacity model feeds airport specific models which are also described. The capacity estimates are used with a queuing model to calculate aircraft delays, and TAP benefits are determined by calculating the savings due to reduced delays. The report includes benefit estimates for Boston Logan and Detroit Wayne County airports. An appendix includes a description and listing of the runway capacity model

Compensating Differentials for Shift Work.

A model analyzing the choice of shift is developed and estimated using data from two supplements to the Current Population Survey. The findings show a positive wage premium for shift work that varies with personal characteristics, and there is strong evidence showing the importance of self-selection, as workers with low potential daytime earnings are more likely to choose night work and supplement their earnings. The findings demonstrate that cross-section estimates of wage premiums for union membership and firm size are biased upward because they pick up some of the compensation differentials for shift work. Copyright 1990 by University of Chicago Press.

The NASA STI Program Office provides

Since its founding, NASA has been dedicated to the advancement of aeronautics and space science. The NASA Scientific and Technical Information (STI) Program Office plays a key part in helping NASA maintain this important role. The NASA STI Program Office is operated by Langley Research Center, the lead center for NASA’s scientific and technical information

An Integrated Safety Analysis Methodology for Emerging Air Transport Technologies

For NASA's air transportation research program, we demonstrate an approach to integrating reliability, performance, and operational procedure modeling into a system safety analysis. Our methodology is distinguished by its ability to merge system design/functionality information with the dynamic parameterization of a system's situation to generate accident statistics and measures of reliable system operation. In addition, this approach can be employed to perform sensitivity analyses to identify weak points in the system's operation and design. Our approach to system safety analysis results from the integration of a Reliability model and an Interaction-Response model. The Interaction-Response model provides information regarding the frequency of encounters and the predicted outcome of those encounters as a function of the system's alerting system and ability to resolve encounters. The Reliability model provides, as a function of time, probabilities associated with the critical systems' a..

SUMMARY

We describe the methods and results of an analysis of the technical and economic benefits of the systems to be developed in the NASA Terminal Area Productivity (TAP) program. We developed a methodology for analyzing the technical and economic benefits of the TAP systems. To estimate airport capacity, the methodology uses inputs from airport-specific data on hourly weather, hourly operations counts, operating configurations, and mixes of transport aircraft types. The capacity model uses parameters that reflect the potential impacts of the TAP systems. The analytic approach takes the capacity estimates, calculates aircraft delays through a queuing model, and calculates the cost savings to airlines from reduced delays. The model analyzes the impact of advanced aviation technologies and changes in operating procedures on terminal area operations. We establish preliminary estimates of the benefits of the TAP systems. As the TAP systems become better defined, more accurate and detailed analyses of the benefits of implementing these systems will be possible. Outputs from the analysis are preliminary estimates of the benefits of the TAP systems. Technical benefits include reduction

Reduction of Weather-Related Terminal Area Delays in the Free-Flight Era

While much of the emphasis of the free-flight movement has been concentrated on reducing en-route delays, airport capacity is a major bottleneck in the current airspace system, particularly during bad weather. According to the Air Transport Association (ATA) Air Carrier Delay Reports, ground delays (gate-hold, taxi-in, and taxi-out) comprise 75 percent of total delays. It is likely that the projected steady growth in traffic will only exacerbate these losses. Preliminary analyses show that implementation of the terminal area technologies and procedures under development in NASA s Terminal Area Productivity program can potentially save the airlines at least $350M annually in weather-related delays by the year 2005 at Boston Logan and Detroit airports alone. This paper briefly describes the Terminal Area Productivity program, outlines the costhenefit analyses that are being conducted in support of the program, and presents some preliminary analysis results