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I stand corrected, but I notice that's for Eglin AFB. The military does some different stuff with their approaches and I don't pretend to know why.
Yep, and those are the NOS charts. But in my civilian airline company issued jepps, they are in there as well. There are also some west coast airports that have them as well. NOTHING on the plates says "for military only".
I stand corrected, but I notice that's for Eglin AFB. The military does some different stuff with their approaches and I don't pretend to know why.
I've seen the "Y" and "Z" on several military ILS approaches. Here's what I've deduced:
- They'll create a few different ILS approaches to the same runway. At Dover, we have one that uses the DOV VORTAC (on the airfield) and another one that uses the ENO VORTAC (off the airfield). They're both ILSs and both require RADAR or DME. So the only way they can differentiate them is by adding another letter.
- Circling approaches already start with "A" "B" or "C" so it appears that they just selected the opposit end of the alphabet for other straight in approaches.
Yep, and those are the NOS charts. But in my civilian airline company issued jepps, they are in there as well. There are also some west coast airports that have them as well. NOTHING on the plates says "for military only".
You know come to think of it, I've usually seen the Y and Z when TACANs are involved. In both of these plates, the initial segment is nonprecision maneuvering to put a plane on the ILS. I've seen that before with an TACAN arc (like the one depicted).
You mentioned that you have these approaches in your Jepps. Valparaiso/Eglin is a joint military/civilian use airport, right? Or am I off my rocker? If that is true, it could explain some things. Most civ a/c don't have TACAN recievers and would be unable to do this approach unless they had an RNAV unit to follow. The unit would need to meet RNP to be used IFR so they used the Y and Z. When LPV capability was added, the government just kept the same naming system.
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You mentioned that you have these approaches in your Jepps. Valparaiso/Eglin is a joint military/civilian use airport, right? Or am I off my rocker? If that is true, it could explain some things. Most civ a/c don't have TACAN recievers and would be unable to do this approach unless they had an RNAV unit to follow.
Correct, it is. However, maybe someone else has, but I have yet to be cleared for the ILS Y or the ILS Z going in there. But for some reason, I have it in my Jepps. And NO, the EMB does not have a TACAN receiver. And like I said, there are some others on the west coast that are NOT joint mil/civ airports that DON'T have TACANs. I don't have my flight kit on me so I can't look them up, sorry.
I think VT got it right with the first point of his post.
I was looking for some today, but no luck. There was too much stuff in my latest update pack to allow me to wander freely through the Jepps.
Yeah, same here. I know there are some on the west coast I saw, just not popping into my head. Nothing special about the east coast, it's just that is where I've doing all my flying for the last 14 months.
I'm not sure if that is true or not. I remember looking at various ILS procedures at places like VPS, and others. There is nothing on the plate that says "special aircrew/aircraft certification required". I did see on one that the ONLY difference between the Z and Y plate was the missed approach.
You probably won't see the "special aircrew/aircraft" box on any Jepp charts that are distributed to the normal subscriber. I worked for an operator that had special approach authorization into ASE (Aspen), and the plates were a special issue to us by Jepp.
Best "non special" approach you would normally get in there (for a typical CAT C jet) was the LOC/DME-E which got you down to an MDA of 10140 MSL (2320 AGL).
Our "special" RNAV/GPS-Z approach got us down to 10060 MSL (2240 AGL). We even had a LOC/DME 15 that got us down to 8780 MSL (1043 AGL)! And we were authorized to use that one AT NIGHT!! And to top it all off... we had an authorized (daytime) circling procedure to land RWY 33!
Makes the hair on the back of my neck stand up just thinking about it!!
Pro Pilot, September 2008 Terminal Checklist has the Seattle, Wash. KBFI RNAV (RNP)Z RWY 13R. I learned a few things from this quiz. Might be worth checking out.
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