Part 60, page 313
Document date 9 January 1972
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FBI 164-81, Vault Part 60 p. 313 (DB Cooper-24998), Letter, dated 9 Jan 1972 — cooper.theunsolved.net/parts/Cooper-Part-60/pages/313
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it being at the same speed as the airplane at the moment of exit, has been ignored since it would be a maximum of 2000' along the airplane's track if the HJ free-- fall all the way to the ground in the "least drag" (tucked) position.)
b. If the 'chute was opened without damage immediately after the HJ left the airplane, he would drift with the wind along Line A--B and would land at Point D. The more expert he was, the longer he would probably free--fall (to limit his drift with the wind). The lowest probable altitude to which he would free-fall is 2000' MSL. If he free- fell to 2500' MSL, his landing would be at Point U.
Based on the above, the most favorable search areas, listed in their order of priority, would be as follows:
-- At Point A.
-- Along Line A--B, favoring the segment between U and B.
-- South of Line A--B.
-- North of Line A--B.
In addition to the above, the following are pertinent:
-- The landing point is more likely to be south of Line A--B, and it is more likely to be in the northwest portion of area A--B--R--O--K--J--A than in the southeast portion thereof.
-- It is substantially less likely that the landing point is north of Line A--B. If it is, the most probable point is south of the Lewis River, and in the southwest portion of the area defined by Points A--B--I--J--A.
-- It seems highly unlikely--though possible--that the landing point is north of the Lewis River, but if it is, it is more likely to be in the southwest portion of the area defined by Points O--M--V--I--H--P--O.
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If there are any questions relative to the above, they should be referred to the under- signed.
Northwest Airlines
January 9, 1972
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DB Cooper-24998
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b6 b7C