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User currently offlineTappan From United States of America, joined Oct 1999, 1541 posts, RR: 33
Posted (15 years 7 months 3 weeks ago) and read 889 times:

Boston tower tonight squeezed in a 737 landing on Runway4R seconds after a 747 took off on same runway. Tower said to the 737 ""Displaced Threshold" in effect clear to land....What is that???Anybody know???

2 replies: All unread, jump to last
User currently offlineCYLW From Canada, joined Apr 2000, 461 posts, RR: 0
Reply 1, posted (15 years 7 months 2 weeks 6 days 21 hours ago) and read 859 times:

A displaced threshold is where for some reason they need to move the threshold further down the runway. Possibly there was damage to the first part of the runway, or there are temporary (or permanent) bstacles on the normal approach path that warranted moving the of threshold. My KBOS chart shows that 4R is displaced a little bit down the runway from taxiway Sierra.

Hope this helps


User currently offlinePurdue Arrow From United States of America, joined May 1999, 1574 posts, RR: 7
Reply 2, posted (15 years 7 months 2 weeks 6 days 19 hours ago) and read 840 times:

Actually, a displaced threshold is a little different than that. While displaced threshold does mean that the threshold of the runway, or the beginning of the usable runway for landing, is moved from the edge of the concrete, it is not due to problems with the runway surface. A displaced threshold generally keeps airplanes a little higher that approaching for the very beginning of the runway, so a landing plane can clear obstacles in the normal approach path. At the Purdue Airport in Lsfayette, IN, for example, we have a displaced threshold that keeps aircraft higher than the height of a freight train when we cross the railroad tracks just before runway 23. The area before the displaced threshold can be used for takeoff, but is not usable for landing.

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