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Lowest descent level

  • Avi8or
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Avi8or created the topic: Lowest descent level

Referring to page 268 of the 2016 version of the book, the question asks for the lowest level to which you may descend in IMC before you first cross the Prosperpine VOR. The question also says that you are not current on RNAV/GNSS approaches. The answer given in the book uses the Prosperpine DME or GNSS ARRIVAL PROCEDURES. I am confused as to why we use the DME/GNSS procedures when the question says that you are not current on the procedures. Is it because the DME/GNSS procedures uses the DME or GNSS to only provide the distance information and the VOR for track guidance?

Also, am I correct that you can use the DME/GNSS procedures even when you are not current on them, the only time you won't use this procedure is when the RAIM warning is given/RAIM is unavailable? Really confused about this.

Many thanks in advance.

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bobtait replied the topic: Lowest descent level

An RNAV/GNSS approach is conducted by reference to the GPS only for both distance and tracking information. You do not have to be current on that procedure to fly a DME/GPS arrival procedure. In a DME/GPS arrival, you use the GPS for distance information only and you maintain track on a conventional ground-based aid such as VOR or NDB.

According to the CASR, you do not have to be recent on each individual procedure. Recency is based on whether the procedure you intend to fly is a 2D or 3D procedure and whether it is conducted with azimuth guidance or CDI guidance. A DME/GPS arrival is a 2D procedure so you are covered for recency if you have conducted any 2D approach in the last 90 days.
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