Originally Posted by GeorgeMandes
Seem like rather than me expanding on this, you should be, since I applied my knowledge of multi-engine fixed wing turbojet operations to what I believe about a 412 operated within a cat A profile.
Your original statement was "
lose an engine at any point from takeoff to landing, and be able to continue successfully", without the restriction of Cat A/PC1 ops: SASless is quite right to point out that your original was a questionable premise
We're maybe getting away from the OP's query, but with the emphasis now on the HV Diagram and its interpretation, this is Agusta's narrative from the A109E RFM. Worth reading as it again applies the HV throughout flight, from TO to landing. A few translation errors, I suspect, from the original Italian but pertinent to the discussion:
HEIGHT - VELOCITY DIAGRAM
The Height - Velocity Diagram enable to establish to establish if, in the event of a single engine failure during takeoff, landing or other operations near the surface, a combination of airspeed and height above ground exists from which a safe single engine landing on a smooth, level and hard surfacecannot be assured (dangerous zone).
The height - Velocity diagram is split in two charts.
Chart A shows the weight values, together with outside air temperature and altitude, at/below which the dangerous zone does not exist. For heavier weights refer to Chart B.
Chart B defines the combinations of height and airspeed to avoid for safe operations.
NOTE
The height - velocity diagram does not define the conditions which assure continued safe flight following an engine failure nor the conditions from which a safe power off landing can be made.
A quick check of the RFM's for the BK117, AS365, S76 and S61
all place a requirement to observe the HV for both TO and landing. Single or twin, it (the HV) is something that should not be considered "
for take off only" as seems to inferred by some on this thread. A low time pilot must not, IMO, be allowed to develop such a mindset that could become a liability in future flying.