Radar computer printout, continuous data recording

FAA via National Archives / The Black Vault · 179 pages · text by OCR

This FAA Alaskan Region Public Affairs Office release, dated March 5, 1987, is a computer printout of recorded FAA radar data for Japan Air Lines Flight 1628 on November 17, 1986. It covers 38 minutes of computer time and lists 105 radar returns. Of these, 86 are usable and 19 are uncorrelated primary returns. The printout records when the pilot first asked about other traffic and when he said he could not see the UFO. It also explains that uncorrelated returns occur when the primary and beacon signals do not match in position.

Open the PDF at page 104 Original source ↗

BEACON TARGET REPORTS STIME RANGE AGP DEG Q 11/19/86 BEACON ALT PAGE QUA SYS

2:37:16.292 12.75 1510 132 0 2275-3 29-3 BT 1

2:37:17.047 14.62 1755 154 0 1550-3 310-3 BT 1

SUBSYS = 1 TOTAL = 7 MODE C TOTAL = 4

2:37:25.437 23.87 900 79 0 0162-3 BT 1

2:37:25.939 22.25 948 93 0 0230-3 BT 1

2:37:27.563 22.75 1238 109 0 1271-3 710-3 BT 1

2:37:27.940 10.87 1292 113 0 0165-3 19-3 BT 1

2:37:29.316 19.37 1494 131 0 2275-3 27-3 BT 1

SUBSYS = 1 TOTAL = 5 MODE C TOTAL = 3

2:37:39.939 23.50 908 79 0 0152-3 BT 1

20.25 951 83 0 0260-3 BT 1

2:32:39.592 22.75 1239 109 0 1271-3 710-3 BT 1

SUBSYS = 1 TOTAL = 5 MODE C TOTAL = 1

2:37:50.800 23.12 909 79 0 0162-3 BT 1

20.25 951 83 0 0260-3 BT 1

2:37:51.900 22.75 1237 109 0 1271-3 710-3 BT 1

2:37:52.175 19.50 1454 123 0 2275-3 25-3 BT 1

2:37:52.552 19.50 1594 140 0 0000-0 BT 1

2:37:53.679 15.87 1974 173 0 1550-3 311-3 BT 1

SUBSYS = 1 TOTAL = 5 MODE C TOTAL = 3

2:33:02.753 22.97 911 82 0 0162-3 BT 1

20.12 951 83 0 0260-3 BT 1

2:33:03.504 22.75 1238 109 0 1271-3 710-3 BT 1

2:33:04.633 19.12 1574 133 0 2275-1 BT 1

2:33:05.136 16.00 2041 179 0 1550-3 310-3 BT 1

SUBSYS = 1 TOTAL = 5 MODE C TOTAL = 2

2:33:14.771 22.50 912 90 0 0152-3 BT 1

2:33:15.594 12.25 1220 107 0 0165-3 BT 1

2:33:15.594 12.25 1220 107 0 0165-3 BT 1

SUBSYS = 1 TOTAL = 3 MODE C TOTAL = 1

2:33:25.951 22.25 916 90 0 0152-3 BT 1

20.12 943 92 0 0260-3 BT 1

2:33:27.614 12.62 1205 105 0 0165-3 BT 1

22.75 1238 108 0 1271-3 710-3 BT 1

2:33:29.364 17.50 1419 124 0 2275-3 23-3 BT 1

2:33:34.005 17.37 3447 302 0 0000-0 BT 1

SUBSYS = 1 TOTAL = 6 MODE C TOTAL = 2

2:33:38.956 21.87 919 90 0 0162-3 BT 1

20.12 949 93 0 0250-3 BT 1

2:33:39.705 12.97 1191 104 0 0165-3 13-3 BT 1

22.75 1239 108 0 1271-3 710-3 BT 1

2:33:42.709 15.00 2239 196 0 1550-3 310-3 BT 1

2:33:45.030 17.00 3439 302 0 2275-1 23-3 BT 1

SUBSYS = 1 TOTAL = 5 MODE C TOTAL = 4

2:33:50.979 21.50 923 81 0 0152-3 BT 1

20.12 947 93 0 0260-1 BT 1

2:33:51.731 22.87 1239 108 0 1271-3 710-3 BT 1

2:33:52.232 15.97 1391 122 0 2275-3 23-3 BT 1

2:39:54.999 15.75 2306 202 0 1550-3 310-3 BT 1

SUBSYS = 1 TOTAL = 5 MODE C TOTAL = 3

2:33:72.313 21.37 925 81 0 0152-3 BT 1

20.12 949 93 0 0000-0 BT 1

2:39:03.944 22.87 1237 108 0 1271-3 710-3 BT 1

Cited by

Japan Air Lines Flight 1628: The Alaska Mothership 1986

About this file

Document, cited by the archive. The PDF is mirrored here; the original link is under it. The text was read from the page images by an OCR model; expect the odd misread word. 179 pages are in the text index: search them above, or from the library's search.