Localizer Y/Z approaches
Eidolon
Joined: May 2001
Posts: 2,244
Likes: 62
From: Some hole
Wilco,
I was of the understanding that the Y, or Z added to approach means first that there are two approaches to the same runway of the same type, different because Z has a VNAV descent (constand flight path angle) where Y has a step-down (dive and drive).
I was of the understanding that the Y, or Z added to approach means first that there are two approaches to the same runway of the same type, different because Z has a VNAV descent (constand flight path angle) where Y has a step-down (dive and drive).
Joined: Jul 2001
Posts: 857
Likes: 30
From: The Ponderosa
swh, sounds good but i hate to ruin your day. The new ILS-Y and ILS-Z for Canberra, Australia are only different for there DA(H) and Min Missed Apch Grad. Similar for Brisbane, but due to IBS DME or BN DME no mention of VNAV.
If you have a reference I'd be most grateful
.
If you have a reference I'd be most grateful
.
Joined: Jan 2005
Posts: 159
Likes: 0
From: LILE
Hi,
here in Italy it's also possible to find a T o Q ILS for the same runway, for example in LIRN
P is for "primaria" (primary)
S is for "secondaria" (secondary)
T is for "terza" (third)
Q is for "quarta" (forth)
Sometimes the difference is also in missed approach procedure but usually the difference is the IAF or in some VOR/NDB/DME unavailability.
I'm sorry for my bad english
Ciao!
Rosanna
here in Italy it's also possible to find a T o Q ILS for the same runway, for example in LIRN
P is for "primaria" (primary)
S is for "secondaria" (secondary)
T is for "terza" (third)
Q is for "quarta" (forth)
Sometimes the difference is also in missed approach procedure but usually the difference is the IAF or in some VOR/NDB/DME unavailability.
I'm sorry for my bad english
Ciao!
Rosanna
Joined: May 2001
Posts: 180
Likes: 0
From: Area 52
From The AIM, Chapter 5-4-5:
“The naming of multiple approaches of the same type to the same runway is also changing. Multiple approaches with the same guidance will be annotated with an alphabetical suffix beginning at the end of the alphabet and working backwards for subsequent procedures (ILS Z RWY 28, ILS Y RWY 28, etc.). The existing annotations such as ILS 2 RWY 28 or Silver ILS RWY 28 will be phased out and replaced with the new designation.”
You have to look at each procedure and decide which applies. Differences may be based on nav aids required such as DME, NDB, or TACAN. Look at Elmendorf AFB. They have the ILS Z RWY 6 and ILS Y RWY 6. The difference is one requires a VORTAC (BGQ) and the other requires TACAN (EDF) for the missed approach. It is up to you to advise ATC which approach you can accept, based on your installed equipment. Other differences may apply at other airports. The bottom line is you have to find those differences and pick your poison. Happy Flying.
“The naming of multiple approaches of the same type to the same runway is also changing. Multiple approaches with the same guidance will be annotated with an alphabetical suffix beginning at the end of the alphabet and working backwards for subsequent procedures (ILS Z RWY 28, ILS Y RWY 28, etc.). The existing annotations such as ILS 2 RWY 28 or Silver ILS RWY 28 will be phased out and replaced with the new designation.”
You have to look at each procedure and decide which applies. Differences may be based on nav aids required such as DME, NDB, or TACAN. Look at Elmendorf AFB. They have the ILS Z RWY 6 and ILS Y RWY 6. The difference is one requires a VORTAC (BGQ) and the other requires TACAN (EDF) for the missed approach. It is up to you to advise ATC which approach you can accept, based on your installed equipment. Other differences may apply at other airports. The bottom line is you have to find those differences and pick your poison. Happy Flying.
Last edited by Zoner; 6th January 2005 at 02:16.
