Our new company SOP's state that minimum Vref. for Flaps30 is 124kts.
We currently only fly the -500's, but the NG's are coming really soon!
Oscillations do happen in level cruise with autopilot engaged. I take them out when the needle hits the 500'/min. mark. Also, the autothrottle is sometimes lagging quite seriously...
Is this also the case with the NG?