Hey Guys and Gals,
I'm a little confused by VASI 4nm obstruction clearance
and PAPI 3.4nm obstruction clearance.
Is that translated to;
You're guaranteed obstacle clearance 4/3.4 miles prior to touchdown or you're guaranteed obstacle clearance until you're 4/3.4 miles prior to the touchdown?
If it's the later, is that the time to disregard the VASI/PAPI and focus on the aiming points for the runway?
On a side note, I couldn't imagine an obstruction being 4 miles prior to or beyond touchdown that would be in conflict with "on glide path" visual aids so that's why it's not making sense to me. I can't think of any airport that you would be 10 miles out on red white glide path and hit something.
I'm a little confused by VASI 4nm obstruction clearance
and PAPI 3.4nm obstruction clearance.
Is that translated to;
You're guaranteed obstacle clearance 4/3.4 miles prior to touchdown or you're guaranteed obstacle clearance until you're 4/3.4 miles prior to the touchdown?
If it's the later, is that the time to disregard the VASI/PAPI and focus on the aiming points for the runway?
On a side note, I couldn't imagine an obstruction being 4 miles prior to or beyond touchdown that would be in conflict with "on glide path" visual aids so that's why it's not making sense to me. I can't think of any airport that you would be 10 miles out on red white glide path and hit something.