A flying friend of mine likes to say that you know you’re into something interesting when you have to sign a waiver beforehand. In the IFR world, I tend to think of approach procedures having an alphabetical suffix, such as RNAV (GPS) Z RWY 01, the same way. Whenever you see one of these, something is probably going to be interesting about the procedure, and the tricky part is figuring out what it is.
The GPS/ILS Approach
Key Takeaways:
- Alphabetical suffixes on approach procedures (e.g., 'Z', 'Y') indicate multiple straight-in approaches of the same type to a single runway, designed to accommodate varied aircraft capabilities or optimize for specific operational needs like lowest minimums or standard missed approach climb gradients.
- These suffixes differentiate approaches based on factors such as required avionics (e.g., GPS vs. RNP, LNAV vs. LPV capabilities) or design constraints like non-standard climb gradients for missed approaches, with 'Z' typically offering lower minimums.
- A new and increasingly common type is hybrid GPS/ILS approaches, which leverage GPS-based routing for initial segments leading to a conventional ILS final. This pragmatic design supports aircraft without WAAS capability while offering GPS efficiency, and aligns with the FAA's long-term plan to phase out VORs.
- Pilots must thoroughly review any approach procedure with a suffix to ensure their aircraft's equipment and performance capabilities meet all requirements, for both primary flight planning and alternate destination considerations.
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