ils ?

[modecontrol]

got saw on an approach plate an ILS Y 6

what does the y stand for?

 

[midlifeflyer]

i think the alphabet designators are used when there is more than one ILS approach. For example, DFW has an ILS 18L =and= and ILS Z 18L approach.

 

[A Squared]

Midlife has it pretty much right. It is used when there is more than one ILS approach procedure to the same runway, using the same ILS facility.
The instances I know of will give a letter suffix to both of the procedures. ie: ILS Z RWY 27 and ILS Y RWY 27.

A few years ago numbers were used instead of letters, so you'd have ILS 1 RWY 27 and ILS 2 RWY 27, but they changed.

Letters starting from the end of the alphabet are used to aviod confusion with circling only approaches (VOR D approach, for example)

 

[groundpointsix]

Why would such a procedure exist? Is it a backup system?

 

[Singlecoil]

Why would such a procedure exist? Is it a backup system?

The procedures are different in some way; either the climb gradient required in the missed approach and hence the minimums, or perhaps the missed approaches are based on different navaids. Also, there are company specific approaches that are sequenced in this was as well.

 

[A Squared]

>>>The procedures are different in some way.

that's it in a nutshell. The ILS approachs I was thinking of that have the Y/Z designations serve the same runway but one is designed around a VOR and is intended to be used with victor airways, and the other is designed around an NDB and is designed to serve the medium frequency colored airways. (yes they still exist) they both use the same localizer/glideslope equipment.


regards

 

[JRSLim]

Aim 5-4-5

Hope this helps


Shaun

 

[Riddle momma]

Another question

What about a COPTER ILS ?

Any ideas on this? I saw it on an approch up in North Dakota, Fargo I think it is.