IAP question
Posted by Standard-Back-9304@reddit | flying | View on Reddit | 11 comments
One portion of this approach confuses me. There is an asterisk next to ZETOG’s at or above 1600’ and the VDP. On the top left, the asterisk indicates LNAV only. I interpret this to mean that I only need to descend maintain at or above 1600 when flying LNAV step downs. Now, does this also apply to the circling approach, or can I go from 3000 at IBODY down to 1100 without the 1600 restriction?
AdDangerous729@reddit
It depends on how you're flying the circling approach. Are you using LNAV only? Then yes. If you're not, then no.
Meta_Cake@reddit
This, circling happens after you have the runway in sight. The rest of the approach is flown before you have seen the runway
sirpsychosexy8@reddit
Yes the intermediate stepdown inside the FAP only applies to LNAV minima, not circling minima. You may descend to the Circling MDA after crossing IBODY. Using LNAV minima doesn’t have an associated vertical mode depending on your aircraft. The VDP is at 1.3 nm from the threshold of rw24 only and refers to along track distance to descend below the LNAV MDA on a 3 degree slope. Circling applies to both/all runways
Mispelled-This@reddit
Until you start to circle (which must be after ZETOG), you are on some other form of vertical navigation. Follow those rules.
rhapsodydude@reddit
The *️⃣ seem to point to 1600 floor but also that 1.3nm thing, but there’s no altitude constraint associated with that 1.3nm point. I’m not familiar with US chart format. Is this 1.3nm point the CDFA point that corresponds to the LNAV MDA? I agree with others that as far as circling is concerned it depends on how the instrument portion is flown. With LNAV you’ll have to respect that 1600’ floor.
fly123123123@reddit
Not sure what CDFA stands for, but the 1.3 nm fix is the visual descent point, or the approximate point at which you would reach the LNAV straight in minimums if you were descending on that depicted 3.10° glide path.
rhapsodydude@reddit
Thanks it’s continuous descent final approach CDFA, I think we’re talking about the same thing.
fly123123123@reddit
Yep!
FlowerGeneral2576@reddit
It depends on how you’re getting to the circle. If you’re circling from an LNAV only approach then you need to abide by the ZETOG altitude. If you’re going to circle from an LPV then you don’t need to necessarily, rather you’ll be following your vertical guidance down.
LegalRecord3431@reddit
If you’re flying the circle you are going to have either LPV, LNAV, or LNAV/VNAV capability so you step at zetog accordingly. It’s not like circling approach is a different set of equipment
rFlyingTower@reddit
This is a copy of the original post body for posterity:
One portion of this approach confuses me. There is an asterisk next to ZETOG’s at or above 1600’ and the VDP. On the top left, the asterisk indicates LNAV only. I interpret this to mean that I only need to descend maintain at or above 1600 when flying LNAV step downs. Now, does this also apply to the circling approach, or can I go from 3000 at IBODY down to 1100 without the 1600 restriction?
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