Accession Number:

ADA149616

Title:

TCAS (Traffic Alert and Collision Avoidance System) II Logic Performance during Phase One Operational Evaluation.

Descriptive Note:

Final rept.,

Corporate Author:

MITRE CORP MCLEAN VA METREK DIV

Personal Author(s):

Report Date:

1984-10-01

Pagination or Media Count:

64.0

Abstract:

This document describes the performance of the collision avoidance logic during the Phase I Operational Evaluation of the Traffic Alert and Collision Avoidance System called Minimum TCAS II. Between November 1981 and March 1982, TCAS units were installed on two Piedmont Airlines B727 aircraft flown on regularly scheduled passenger flights. For this phase of testing, data was recorded while trained observers viewed the TCAS advisories. However, these displays were not shown to the flight crew. The analysis of logic performance first required identification and removal of alerts caused by hardware or software coding problems that were subsequently fixed, or else caused by problems in the collision avoidance logic which were subsequently removed. Examples are shown for which logic improvements correct earlier problems. Operational questions, observer comments, and an assessment of the true alert rate are then examined using the recorded data. Additional keywords Altimetry errors Visual acquisition and Near Midair Collision NMAC. Author

Subject Categories:

  • Flight Control and Instrumentation

Distribution Statement:

APPROVED FOR PUBLIC RELEASE