747-400 Flap Settings — Tech Ops Forum

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747-400 Flap Settings

Wdleiser From United States of America, joined Apr 2004, 958 posts, RR: 4
Posted (8 years 2 months 3 weeks 4 days ago) and read 11726 times:

Hey all, I would like to know what is the most widely used or optimal flap settings for a 747-400 on takeoff. I know loads will probably be a factor.

6 replies: All unread, jump to last

VS74741R From United Kingdom, joined Feb 2005, 272 posts, RR: 0
Reply 1, posted (8 years 2 months 3 weeks 4 days ago) and read 11717 times:

I think they set the flaps to 10. You should try asking in the Tech/Ops forum.

Obviously a Virgin Atlantic fan!!!

PhilSquares From , joined Dec 1969, posts, RR:
Reply 2, posted (8 years 2 months 3 weeks 3 days 17 hours ago) and read 11582 times:

Flaps 10 or Flaps 20 are the takeoff settings on the -400. The selection of flaps may be driven by company procedures, temp, runway length, obstacles. The list is endless.

Landing flaps are 25 or 30.

CX flyboy From Hong Kong, joined Dec 1999, 6363 posts, RR: 56
Reply 3, posted (8 years 2 months 3 weeks 3 days 17 hours ago) and read 11569 times:

Flap 10 or Flap 20 is normally used based on conditions such as weight, runway length, temperature, altitide etc...

ArmitageShanks From UK - England, joined Dec 2003, 3366 posts, RR: 16
Reply 4, posted (8 years 2 months 3 weeks 3 days 14 hours ago) and read 11451 times:

As far as I know, BA uses 20 most of the time for takeoff.

Check your bags, check your brain.

AJ From Australia, joined Nov 1999, 2376 posts, RR: 27
Reply 5, posted (8 years 2 months 3 weeks 2 days 18 hours ago) and read 11280 times:

SOP at Qantas is Flap 20 for all takeoffs.

CX flyboy From Hong Kong, joined Dec 1999, 6363 posts, RR: 56
Reply 6, posted (8 years 2 months 3 weeks 2 days 5 hours ago) and read 11211 times:

We used to use Flap 20 as standard as well, but they introduced a computer system to calculate takeoff performance settings so that the figures can be more precises, and the computer is capable of calculating many more variables than a pilot can, so they introduced F10 takeoffs as well for us.

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