Originally Posted by
galaxy flyer
Kinda hard to fly a CANPA at KSMX. First, it is LOC-based, I not know that you can mix an FMS-derived vertical path with a LOC. Second, it is a V-MDA, not V-RWY (Collins terms)m so the path ends at the FAF. Last, the angle far exceeds 3 degrees, more like 10 degrees for a straight in.
GF
You can (meaning that you can build it in the FMS), but that does not give you any obstacle clearance guarantee.
Reposted from the VASI landing thread:
VERY important safety note: Non-precision RNAVs are being published showing a vertical Descent angle (VDA) and TCH on the approach chart. This information can be coded by avionics database providers to provide *advisory guidance* in the final segment. However, there is no TERPs criteria for obstacle clearance for the VISUAL segment of the path below the MDA. Consequetnly, if the VDA is blindly followed below MDA, an aircraft may come too close to, or impact obstacles or terrain penetrating the 34:1 surface extending out from the runway....
It is the pilot's responsibility to use the barometric altimeter to ensure compliance with altitude restrictions. Advisory vertical guidance is not approaved vertical guidance like that found on approaches with L/VNAV, LPV, ILS lines of minima. Advisory vertical guidance does not provide a TERPS-protected glidepath.
In short - BE CAREFUL!
USMCFLYR