S76 Height Velocity Diagram
I wonder if Nick or one of you other experts could clarify the S76 Height Velocity Diagram.
Simply put, does the diagram in the RFM refer that if you are in the shaded area and you lose 1 engine then you will not be able to fly away on the other engine OR perform a safe landing?
or
Does it refer that if your in this shaded area and you lose an engine. ie now you are operating like a single engine helicopter, and you then lose the remaining engine, you may not be able to perform a autorotation to a safe landing?
This discussion arose between my colleagues and i when we were discusiing the AW139, and how it has been reported on the 139 thread that it does not have an H-V Diagram being Cat A and able to maintain flight on one engine.
But what happens if you lose both engines?
Surely there is an area, depending on height and airspeed, where you will not be able to perform a safe autorotation and doesn't the manufacturer have to demonstrate an H-V Diagram for certification?