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??