Originally Posted by
Non-PC Plod
Originally Posted by
Bravo73
It depends on which Phase.
Phase 7 GA mode is ‘41kts to VNE’. Most of the other modes are either 50 or 60kts.
For Phases 4, 5 & 6, most modes start at 60kts.
The Vmini is 50 KIAS. So no matter what modes you use, you are not certified to use them in IMC below 50 The key point is, you need to be >50 kts if you are in cloud. That is why, for example you would do a clear area profile in low visibility, because your VToss also happens to be Vmini - you get to a safe IMC speed before you go into cloud.
Good point Plod. In practice the difference in time between a VTOSS of 50 KIAS clear area and 40 KIAS pad/deck following rotation means the aircraft will accelerate through 50 kts sooner following the pad/deck procedures. And less t/o distance will be therefore be required.