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This package was compiled by the FAA Alaskan Region Public Affairs Office in Anchorage and sent to FAA managers with a memo from Paul Steucke dated March 5, 1987. It gathers material on the November 17, 1986 sighting by the crew of Japan Air Lines flight 1628: a news release, pilot and controller transcripts, crew interviews and radar analysis. The FAA concluded that it could not confirm the event. It attributed the second radar target to a split, uncorrelated return from the JAL Boeing 747 and planned no further investigation.
“Reading”7 pages
I I w ,..J H ~ ~ -- An "unc o rre la t ed p r i ma r y and be a con(sec onda r y ) r e t u rn on a r ad a r screen oc cur s wh e n th e r adar e ne r gy that is s ent up t oward the ai r c raft (pri ma r y si gnal) r e turns off t he surface o f the aircraft at a s l ightl y di f ferent moment than the beac on (secondary ) transp onder signal a nd the t wo do not match up as being a t the same place or same computer rad a r cell . --RADAR COMPUTER CELL, 1/4 MILE-- SECONDARY RADAR RETURN (Beacon) (Transponder) --11 FAA RADAR SAME AIRCRAFT RETURN (Skin- Surface) --v'-RADAR CELL =PRIMARY RAD~ RETURN =SECONDARY RADAR RETURN =CORRELATED RETURN (Combined Return) Drawing by Paul St eucke March 5, 1987 =UNCORRELATED RETURN
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