Guest

747-400 Minimum Take Off Length

Sun Oct 01, 2000 4:33 am

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?
 
timz
Posts: 6224
Joined: Fri Sep 17, 1999 7:43 am

RE: 747-400 Minimum Take Off Length

Tue Oct 03, 2000 6:51 am

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.
 
Guest

RE: 747-400 Minimum Take Off Length

Wed Oct 04, 2000 4:36 am

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!

From,
SW737-700


 
John
Posts: 1254
Joined: Sat Sep 18, 1999 10:47 am

RE: 747-400 Minimum Take Off Length

Thu Oct 05, 2000 4:33 am

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?
 
Guest

RE: 747-400 Minimum Take Off Length

Thu Oct 05, 2000 5:00 am

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!
Iain

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