Originally Posted by loudgarrettdriver
Remeber this is called a PDP. A VPD is shown on the plate.
Take 10% of the (HAT) subtract it from time listed on the plate.
Ex. Time on the plate is 2 minutes. (HAT) is 400ft.
10 into 400 is 40. Right. Now- subtract 40 secs from 2 minutes which gives you 1 minute 20 secs. At 1:20 if you don't have the vis go missed.
This is for a 3 degree glide slope.
Gotta disagree with the part about going missed. You've just calculated a PDP, not a new MAP.
I know where you're coming from. You're saying that if you do get the approach lights or the runway environment in sight after your PDP, you're not going to be able to fulfill the other requirement of 91.175 of an approach to landing using normal maneuvers. That's not necessarily true.
Also, the way you wrote your response, you implied that you would go missed at your PDP. You would still want to continue to the MAP before executing the missed approach procedure.
Hog