What is an ILS Y 19R approach?

[Stewie]

I was wondering if anyone knew the significance of the (Y) or (Z) or whatever follows the ILS name on an instrument approach chart? Someone asked me recently and I can't find the answer. I know that if it were a VOR A or B it would mean that there were multiple approaches of that type serving that particular airport but of all the ILSs I've shot I've never seen one called, say for example the ILS Y 19R.

 

[landlover]

two approaches to one runway both using an ils, check the aim its in there

 

[viper548]

two approaches to one runway both using an ils, check the aim its in there

Yep...often found at military bases.

 

[Stewie]

any idea why you would need two different ILS's to serve the same runway. I can only guess as a backup if one failed? That might be why you usually only see them at military bases?

 

[Metro752]

I hushed a puppy

 

[Almerick07]

Actually last I checked the Y meant "and" in spanish...

 

[A Squared]

any idea why you would need two different ILS's to serve the same runway. I can only guess as a backup if one failed? That might be why you usually only see them at military bases?

You don't have 2 different sets of ILS equipment, you have 2 different ILS procedures, both using the same LOC and GS. One reason you might encounter this is one procedure has been designed for transitions from victor airways and the other designed for transitions from colored airways, using an NDB as an initial approach fix.

 

[TR4A]

Same ILS procedures, different minimums. At Midway (MDW) we (SWA) have an ILS 31C Z approach with lower minimums. It requires the use of the HGS (HUD) IIIa mode.

 

[gkrangers]

colored airways

racist!!!!!

 

[DC8 Flyer]

heres two examples

http://www.naco.faa.gov/d-tpp/0509/00264RY12R.PDF

http://www.naco.faa.gov/d-tpp/0509/00264RZ12R.PDF

one is a LNAV/VNAV, and one is just LNAV. They both use the same fixes, but the LNAV/VNAV one replaces WALGO on the LNAV with a distance (VDP) for the LNAV/VNAV.

Weird thing is the "LNAV" minimia on the LNAV/VNAV is 160' higher than the LNAV only approach and the MAP is farther from the runway on the VNAV/LNAV??

 

[Afterprop]

Another look?

I know that if it were a VOR A or B it would mean that there were multiple approaches of that type serving that particular airport . . .

Methinks a VOR-A or -B indicates the approach ends in either a circling maneuver to a landing runway, or the descent rate from the final approach fix to the runway exceeds a given rate (400'/nm ? ? ? ) for it to be classified as a straight-in. I don't recall ever seeing a Y or Z designator on a military approach . . . but I might be wrong.
Cheers . . .
'Props

 

[Stewie]

cool. thanks for the info guys

 

[Night_Flight]

Circling Approaches

See following post...

Wow, chill A Squared! My mistake. We all know that things posted here are not 100 percent accurate and obviously I wasn't correct.

No need for an ulcer! Updated my login info for your personal satisfaction (although I really don't care). I was still at UND when I filled that column.

Don't you just love in aviation how some people have to prove they are know-it-all's. It would have been easier to politely call out my mistake instead of making yourself out to be one who, as you later state..."talking out of thier a$$es".

-Night_Flight-

 

[A Squared]

VOR-A..B...Z...whatever, approaches are circle-to-land approaches. This is done because at the VDP/PDP, the aircraft is not in a normal position to land. Normal position means a lot to the FAA, so I'm not sure on the exact criteria may be.

VDP- Visual Desent Point
PDP- Planned Descent Point

Usually, circling approaches are used when the final approach course and the runway heading vary by 30 degrees or greater.

-Night_Flight-

Sighhhhhhh, don't you just love it when a question has been answered correctly then some twit comes along and contradicts everything which has been said, with the *wrong* answer? As has been stated by several people (correctly) already, the use of Z or Y does *not* signify a circliing approach, it signifies that 2 different IAPs use the same navaid. As has been mentioned, it's in the AIM, specifically 5-4-5(a)(3) look it up. edit: Ahhh shoulda known, an RJ FO from UND, probably so convinced he's god's gift to aviation he doesn't *need* to crack open the AIM. So tell me sport, when did "UND" become a rating? Just *had* to let the world know you're from UND, but couldn't find a place for that in your profile, could you?

 

[DC8 Flyer]

A Squared,

You're a smart guy, no need to bash UND over one mistake. There are quite a few guys out there that have no idea what the Y and Z lettering means. Don't be one of those guys that has to "rise" to the challenge just to prove how smart you are and leave the personnel attacks and ego at the login screen.

Cheers! :nuts: