eagle737:
So here are some qiz for Aterpster:
1)what's the difference between TERPS1/2/3 when we have them on the left bottom of Jeppesen chart?
Jeppesen will have "TERPS" if that is known as the criteria used; "PANS-OPS" if that is known as the criteri used. And, nothing for "criteria unknown or uncertain." Any number should be the IAP amendment number.
2) When to descend from MDA? For my understanding, we can only descend from MDA when A)we are close to the final course; B)as well as on the proper landing profile. Reason A)we can have a obstacle clearance only when we are close to the final course; B) for stable approach purpose.
But what is "close to the final course"? 10° each sides of final course when we have a PAPI? somebody told me that, but i don't know where it comes from.
I can only speak to the U.S. In the U.S. a PAPI or VASI is good to 4 miles unless further limited in the airport facility directory (FAA publication). And, unless limited they are good 10 degrees each side of runway centerline, extended, not necessarily the final approach course.