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Flap Retraction  
User currently offlineQantas Captain From Australia, joined Sep 2000, 13 posts, RR: 0
Posted (14 years 11 months 2 weeks 3 days 11 hours ago) and read 1466 times:

At what Altitude does a jet retract flaps after takeoff?
Thanks Michael

4 replies: All unread, jump to last
User currently offlineAmbasaid From , joined Dec 1969, posts, RR:
Reply 1, posted (14 years 11 months 2 weeks 3 days 10 hours ago) and read 1444 times:

Without any obstacles around, the minimum that we are allowed is 400 feet. A requirement to clear obstacles would drive this height higher.

User currently offlineBuff From Australia, joined Mar 2007, 0 posts, RR: 1
Reply 2, posted (14 years 11 months 2 weeks 3 days 9 hours ago) and read 1416 times:

On our normal North American departures, the flap retraction cycle starts in the third segment climb, usually at 1,000' AAL (above airport level) depending on climb segment obstacle clearance limits. In Europe and under some other noise abatement restrictions, flap retraction is delayed until above 3,000' AAL.

Flap retraction delays may also occur if a minimum radius turn is required in the DP (departure procedure, formerly known as SID [standard instrument departure]). Lower speed means tighter turn.

You might want to check out the Tech Forum if you have other questions like this!

Best Regards,


User currently offlineAmbasaid From , joined Dec 1969, posts, RR:
Reply 3, posted (14 years 11 months 2 weeks 3 days 8 hours ago) and read 1407 times:

I love it, you get one answer from a pessimist and one from an optimist.

I believe that the engine will fail, hence the low clean up altitude. Buff believes that the engine won't fail and therefore gives the normal clean up heights.

Buffs answer is more likely in everyday operations.

User currently offlineSkystar From Australia, joined Jan 2000, 1363 posts, RR: 2
Reply 4, posted (14 years 11 months 2 weeks 2 days 18 hours ago) and read 1378 times:

Typically speaking, clean up begins at around 1500 ft AGL (sometimes lower at 1000ft AGL), so you're looking at starting flap retraction sometime around then.

Flap retraction is airspeed dependent, not altitude dependent, however as you reduce your angle of climb at a certain altitude to increase speed, you retract flaps.



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