B737 NG Alternate flap operation or limit of 230kts

[Pin Head]

Hi

Reason for? Flaps one limit is 250kts normally so why the loss of 20kts.

I still it related to a normal Vnav departure where the limit speed of 230kts is set until flaps my up (ACT LIM CLIMB)

Thank you

[Jwscud]

When operating alternate flaps, all LE Flaps and Slats go straight to full extend and cannot be retracted. Normally you only get full extension at F10 or greater. 9.20.17-18

You will note that the placard for F10 is 210kts - I am guessing that the LEDs on their can take slightly greater air loads than the TE Flaps >5

[B737900er]

Its a leading edge device limitation. Just as JWSCUD said this is taken care off in the F10 limit speed.