what is the difference between ILS Z & Y?

[moey124]

i was doing a apprroach into YSSY.. and it told em to land at 30L and i clicked ILS Z.. but when i clicked the approach switch it ddidnt have glideslope... so i am wondering if it has to do with ILS z & Y.. cause i was at the right altidude etc... can someone explain to me what is the differenc ebetween ILS Z OR Y ? thanks

[Kerlix]

Found this:

 

"8.5.1.3.2 The single letter suffix shall be used as follows: 

a) when two or more navigation aids of the same type are used to support different approaches to the same runway; 

b) when two or more missed approaches are associated with a common approach, each approach shall be identified by a single letter suffix; 

c) if different approach procedures using the same radio navigation type are provided for different aircraft categories; and 

d) if two or more arrivals are used to a common approach and are published on different charts, each approach shall be identified by a single letter suffix. If additional radio navigation aids are required for the arrival, they 
shall be specified on the chart’s plan view. For example: 

ILS Z RWY 20 (“DNA VOR Arrival” shown in the plan view) 
ILS Y RWY 20 (“CAB VOR Arrival” shown in the plan view)"

 

 

 

I'm sure some others here can elaborate further.

[3-2-1-Now]

You hit it on the head.

 

Two ILS approchaes to the same runway, but with differences.

 

Why Z, X, etc..? To help prevent confusion with SID/STAR that are ABC1A, etc..

 

Best regards,

Robin.

[moey124]

Oh okay I understand.

[lekijiji]

I don't have your charts with me, but have a look at the missed approach procedure.

It could be different depending on what letter (Y/Z) you will have to fly

[moey124]

got yah! thank guys.. thanks once again robin.. when I can help you??? lol....

[DavidP]

Look closely at the plates at "NAVAID RQ":

 

the 34L ILS-Z requires the ISN DME

the 34L ILS-Y requires the SY DME

 

(top right hand corner of the plate)

[Boeing or not going]

Notice that many X Y Z approaches have different minimums as well.

[ailchim]

Can I ignore this?  I only ever have one missed approach: nose first into the nearest piece of tarmac.

[Chrjs]

Can I ignore this?  I only ever have one missed approach: nose first into the nearest piece of tarmac.

 

If you fly offline you can do what ever you want. Flying online however is a different story....

[Blade10]

 

The Y uses an RNAV TAA to join the procedure and requires GPS. The Z uses conventional ground navaids to join the procedure and requires either DME or radar. The two procedures can't be charted on the same chart because the Z has an MSA defined whereas the Y does not.