View Full Version : B737 N-1 Flaps 10 circling, why?

8th Oct 2009, 08:21
Dear all,

Can anyone explain the reason why Boeing wants flaps 10 for a B737 N-1 circling? I can understand why we wait with gear down, flaps 15. But if it is to increase maneuvre margin why not use it on a normal circling as well?

Thanks in advance,


8th Oct 2009, 10:54
Never looked into this specifically but, probably, for OEI 10 deg provides for the approach criteria while 15 deg does likewise for landing.

8th Oct 2009, 12:00
Which B737? ON NG's F10 is same speed as F5 but more drag, so doesn't seem a good idea. On the classic with fixed speed schedules for flaps, F10 will give you a reduced IAS and at max wt. bring you within Cat C circling minima. At high wt's. F5 might take you into Cat D and perhaps higher minima. You'll need to check the speeds; I don't have them to hand.

8th Oct 2009, 13:59
It's about NG's, it's in our FCTM. Recommended to use 10 optional 5.


FCS Explorer
8th Oct 2009, 16:29
maybe to get a better visual segment?