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747-400 Minimum Take Off Length  
User currently offlineSW737-700 From , joined Dec 1969, posts, RR:
Posted (15 years 8 months 2 days ago) and read 10858 times:

I would like to know if you where taking off in a 747-400 at sea leval with a light load what would be the length that the 747-400 would take on the runnway intil the gears lift off the ground?

4 replies: All unread, jump to last
User currently offlineTimz From United States of America, joined Sep 1999, 7224 posts, RR: 7
Reply 1, posted (15 years 7 months 4 weeks 1 day 21 hours ago) and read 10742 times:

Less than you think. Following is from graphs in the Boeing publication 747-400 Airplane Characteristics for Airport Planning, dated Oct 1994:

Sea level standard day (59 deg F, 29.92 inches Hg), no wind, level runway, air conditioning off (except one pack can be powered by the APU), PW4056 engines: minimum runway length of 5500 ft allows a takeoff weight of 635,000 lb, 6000 ft allows 665,000 lb, then a fairly straight line from there to 10,100 required feet for 850,000 lb. These are runway requirements, which are of course longer than the ground run.

Same publication gives payload-range graphs: it seems that aside from runway strength problems a 744 could carry 400 pax and bags (but not much freight) off of SNA's 5700-ft runway nonstop to New York, or the same payload out of LGA's 7000 ft to Europe. That includes reasonable reserve fuel.

User currently offlineSW737-700 From , joined Dec 1969, posts, RR:
Reply 2, posted (15 years 7 months 4 weeks 1 day ago) and read 10691 times:

Thanks Timz! I heard that the 747-400 could take off in a short distance with a light load but I never would guess full of passangers. Thanks again for all the specs. it was exactly what I was looking for!


User currently offlineJohn From United States of America, joined Sep 1999, 1374 posts, RR: 5
Reply 3, posted (15 years 7 months 4 weeks ago) and read 10639 times:

5700 feet is WAY TOO SHORT a runway for a 744 w/400 pax SNA-JFK. Absurdly ridiculous, IMO, as well as dangerous. It might indicate this on the minimums chart, but what airline, in their right mind, would ever attempt this? Has a 744 ever diverted to SNA or done any test runs there, prior to its delivery?

User currently offlineIainhol From , joined Dec 1969, posts, RR:
Reply 4, posted (15 years 7 months 3 weeks 6 days 23 hours ago) and read 10630 times:

The problem with SNA is to have that aircraft land there, you have to get it up to V1 and stop with so many feet to spare. A 747 would not be able to that at SNA. But we alre taught at pilot school specs are to sell the plane times the spec by 1.5 and that is closer to the deal!

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