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Split beacon target explanation

FAA via National Archives / The Black Vault · 5 pages · text from the file's own layer

This FAA release, dated February and March 1987, covers the radar data from Japan Airlines flight 1628 on November 17, 1986. It includes a statement and drawing by Paul Steucke of FAA Public Affairs in Anchorage, a memo from the Airway Facilities Division, and an analysis by Dennis Simantel. They conclude that the radar showed an uncorrelated primary and beacon target, which they describe as a normal timing effect and not an unknown object.

MemorandumU.S. Department
of Transportation
Federal Aviation
Administration
Subject INFORMATION: Description of Radar Split Image;
AAL-5 Meno of 2/5/87
From Manager, Aii:way Facilities Division, AAL-400
To Public Affairs Officer, AAL-5
Date :
Reply to
Attn . o f:
FEB 2 7 1987
'!his letter transmits our analysis of the radar targets associated with
JAL flight 1628, on November 17, 1986, and supplements discussions we have
had regarding what has been referred to as "split illlages".
We concur with the interpretation provided to you by the Alaskan Region
Air Traffic Division.
'nle attached Analysis of Uncorrelated Primary an:i Beacon Targets by Dennis
Silllantel covers the subject in roc>re detail, and addresses the questions
raised in your letter.
Paul , I appreciate the team approach you have taken to more fully
urrlerstarrl a complex issue. '!he issue is an excellent example of how
"interdepen:lent" we are. If we can provide any more information, please
i!iC.
David F. Morse
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Document, cited by the archive. The PDF is mirrored here; the original link is above. 5 pages are in the text index: search them above, or from the library's search.