NTRS - NASA Technical Reports Server

Back to Results
Pilots' use of a traffic alert and collision-avoidance system (TCAS 2) in simulated air carrier operations. Volume 2: AppendicesPilots' use of and responses to a traffic alert and collision-avoidance system (TCAS 2) in simulated air carrier line operations are discribed in Volume 1. TCAS 2 monitors the positions of nearby aircraft by means of transponder interrogation, and it commands a climb or descent which conflicting aircraft are projected to reach an unsafe closest point-of-approach within 20 to 25 seconds. A different level of information about the location of other air traffic was presented to each of three groups of flight crews during their execution of eight simulated air carrier flights. A fourth group of pilots flew the same segments without TCAS 2 equipment. Traffic conflicts were generated at intervals during the flights; many of the conflict aircraft were visible to the flight crews. The TCAS equipment successfully ameliorated the seriousness of all conflicts; three of four non-TCAS crews had hazardous encounters. Response times to TCAS maneuver commands did not differ as a function of the amount of information provided, nor did response accuracy. Differences in flight experience did not appear to contribute to the small performance differences observed. Pilots used the displays of conflicting traffic to maneuver to avoid unseen traffic before maneuver advisories were issued by the TCAS equipment. The results indicate: (1) that pilots utilize TCAS effectively within the response times allocated by the TCAS logic, and (2) that TCAS 2 is an effective collision avoidance device. Volume 2 contains the appendices referenced in Volume 1, providing details of the experiment and the results, and the text of two reports written in support of the program.
Document ID
Document Type
Technical Memorandum (TM)
Chappell, Sheryl L.
(NASA Ames Research Center Moffett Field, CA., United States)
Billings, Charles E.
(NASA Ames Research Center Moffett Field, CA., United States)
Scott, Barry C.
(Federal Aviation Administration Moffett Field, CA., United States)
Tuttell, Robert J.
(Naval Postgraduate School Monterey, CA., United States)
Olsen, M. Christine
(NASA Ames Research Center Moffett Field, CA., United States)
Kozon, Thomas E.
(Sterling Software Palo Alto, CA., United States)
Date Acquired
September 5, 2013
Publication Date
January 1, 1989
Subject Category
Man/System Technology And Life Support
Report/Patent Number
NAS 1.15:100094-VOL-2
Accession Number
Funding Number(s)
PROJECT: RTOP 505-67-41
Distribution Limits
Work of the US Gov. Public Use Permitted.
No Preview Available