global707

Can any tell me why you have Instrument Approach Procedures lettered X, Y and Z. I understand the principle behind the P, S and T, but why the X,Y and Z? What do the letters stand for. Example would be Bari

Thanks
Global

FRICKFROCK

The means of Y X Z letters are that the obstacle protection area change for that specific approach procedure. Usually you'll get higher minima.
BY

lucaberta

I was in the Los Angeles area last month and they use X Y Z also over there to differentiate between procedures that have you fly to the same runway using the same IFR approach (be it ILS, VOR, VOR/DME or GPS) but yet are different enough to justify a completely separate chart.

I flew out of Camarillo KCMA, and there are two GPS runway 26 approaches, Yankee and Zulu. Yankee is slightly offset to the north of the runway centerline, while Zulu is pretty much aligned with the centerline but interferes with other airspace in the area (or so I was told). Yankee is then the preferred GPS approach into runway 26 at KCMA.

Ciao, Luca

global707

Maybe my innitial question was not clear.

What does the X, Y and Z stand for?

P is for Primary, S is for Secondary and T is for Tertiary.

Thanks
Global

Zenigata

X-Y-Z-P-S-T-Q is a procedure ( ILS or VOR etc) with different IAF waypoint or navaids!!! If you will check every chart you could see the different IAF....

Topper80

global707, there are not a real meaning for Z-X-Y (instad of P for primary... S for.......). Bye

global707

So if X, Y and Z do not stand for anything, why do they not call them P, S and T? I am trying to understand the logic behind the change from P, S and T to X, Y and Z.

Thanks to all so far for contributions
Global

JetMcQuack

Because in some airports both P S T series are still operative together with X Y Z series.
In other airports where you find just X Y Z I think it's just a new way to identify the brand new procedures using final letters of the alphabet rather than using i.e. G H I that could lead to think tha there could be also a D E F etc. and you would not find the chart

In other words, it's a clear signal that it's a new procedure.

JET