ys120fz,
I doubt MP would help you identify whether an engine had failed or just the turbo..
At sea level the MP would most likely be ~30 inches completely failed; with a failed turbo; and shut down.
For the sake of others learning, identifying a failed engine prior to shut down should include completely closing the throttle. During this process you have a very good chance of identifying if any power is still being produced or not.
There may be some exceptions to the above but I'm trying to highlight the danger of relying on engine instrumentation alone in piston aircraft to identify failures.
Either way, I don't recommend anyone knocking back the assistance of the AFAP in such circumstances. Good on you for offering it..
