B737NG Flap settings for Take-Off

[ndegepilot]

We use a BLT for our performance. As one might expect off short runways Flap 25 often offers us the highest TOW.

Do any other operators use Flap 25 for take-off? If so do you have any particular procedures if you loose an engine, bearing in mind that SE approach and landings are (normally) flown with Flap 15.

We don't use Flap 25 but I notice that, particulalry for the -800, it gives you the best tail clearance on rotation.

Any thoughts?

[bantios]

Flap 25 on take off?

You gotta be a nutta!

Picture this- Single engine failure after rotation-

too much drag. By the time u put the flaps to 15 ud stall.

[RYR-738-JOCKEY]

Well, bantios...then you don't know much about performance. When you use flaps 25 on T/O, it's because you are somehow runway limited. You need to get airborne quickly. When you find the required flaps setting, you also check that you don't exceed your climb limited weight. So your climb performance is as good as for flaps 1 T/O.
Example: Let's say for a flaps 1 T/O your runway limited weight is 70 tons, for flaps 25 on the same runway it might be 60 tons. However for the flaps 1, your climb limited weight will be higher than for flaps 25, so you have to reduce your TOW accordingly to comply with the climb requirements.

[dolly737]

ndegepilot,

we do use F25 T/O - not very often - but sometimes a short ruway doesn’t give us any other choice. You are, of course, covered regarding S/E climb gradients and the cleanup procedure after an engine failure is just the same as for any other takeoff.

[ndegepilot]

Thank you dolly 737. Do you carry out any special simuator sessions to cover a Flap 25 T/O? I ask because I have done renewals using FSBTI/Alteon/Boeing, and none of their instructors has ever been able to offer any guidance, and of course there is nothing in the manual.
Certainly when tried in the Sim. it is all fairly straightforward, but how true to the aeroplane is the simulator?

Rest easy bantios, flap 25 on an NG is not as "draggy" as on the earlier models!

[dolly737]

Do you carry out any special simuator sessions to cover a Flap 25 T/O?
No, because there's nothing special to it. Apply the same technique as for any other flap setting. Just lifts off at a lower pitch.

.

[ndegepilot]

dolly737...... Thank you for your reply.