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#31
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Stan Gosnell wrote: pl The term 'precision approach' refers to having vertical guidance (a glideslope), not to the runway alignment. A precision approach does have to be aligned relatively closely, but not precisely. I can't recall the exact number of degrees off the top of my head, but it's not exact. 3 degrees |
#32
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Dave Butler wrote: Stan Gosnell wrote: A precision approach does have to be aligned relatively closely, but not precisely. I can't recall the exact number of degrees off the top of my head, but it's not exact. Here's an example of a precision approach that's not aligned with the runway, the LDA Rwy 6 at ROA, Roanoke, VA. Terrain appears to be the motivation for the misalignment. http://www.myairplane.com/databases/.../00349LDA6.PDF That is not really a precision approach so far as most of the world is concerned. It is a FAA category of IAP that does not meet the ICAO definition of a precision approach. The FAA calls these an approach with vertical guidance ("APV") and they provide the definition in the AIM: "b) Approach with Vertical Guidance (APV). An instrument approach based on a navigation system that is not required to meet the precision approach standards of ICAO Annex 10 but provides course and glidepath deviation information. For example, Baro-VNAV, LDA with glidepath, LNAV/VNAV and LPV are APV approaches." |
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