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Old January 7th 07, 09:14 PM posted to rec.aviation.ifr
Sam Spade
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Default LPV vs LNAV/VNAV?

Stan Prevost wrote:
"Sam Spade" wrote in message
...

Stan Prevost wrote:


Can an RNAV approach have stepdown fixes on the final approach segment?



Yes.

When VNAV first came in they could only be an an LNAV-only IAP. Then,
quite a few years ago that was changed to permit them for LNAV minimums on
an LNAV/VNAV IAP.



An "advisory" guide slope could only be applied to a final approach segment
without stepdown fixes, or one in which the glide slope clears the
obstacle(s) by the required margin. I doubt that all LNAV-only approaches
have been TERPSed for that, especially those without VDPs.



They aren't TERPsed, rather Jeppesen applies an angle that assures
clearance of the stepdown fixes.

Example:

http://tinyurl.com/y68phr