bookworm:
But if you're using raw data, selecting a rate of descent with mile-spaced DME crosschecks or worse, there's a significant variability in the distance from the runway at which you hit the MDH/OCH, and your dip of 50 ft eats directly into the margin above obstacles on the approach. I would love to see the risk assessment that demonstrates that dipping 50 ft below the OCH in these circumstances is within tolerable risk.
No matter how much you'd love to see them, they don't exist.
