Originally Posted by
tdracer
It would help if we knew the engine/aircraft you're talking about.
BTW, is it safe to assume by "high density altitudes" you mean high altitudes/low density? Because "high density" usually means low altitudes.
Regional technical language barrier.. at least in North America, there's the term "density altitude" meaning what the altitude would be, on a standard day, that corresponds to the current density of wherever we're talking about.
So his situation (a "high density altitude") is a density altitude that is high, i.e., low density.