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A 320 Flight Management Function

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A 320 Flight Management Function

Old 5th Feb 2019, 09:11
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A 320 Flight Management Function

In the Limitations section of the FCOM, it is stated that FMGS Lateral and Vertical guidance is certified for Instrument Approach procedures except ILS, LOC , LOC BC , GLS etc. What does this mean?
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Old 5th Feb 2019, 10:03
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Originally Posted by Boyington View Post
In the Limitations section of the FCOM, it is stated that FMGS Lateral and Vertical guidance is certified for Instrument Approach procedures except ILS, LOC , LOC BC , GLS etc. What does this mean?
It is certified for RNAV/RNP approaches, and VOR and NDB Overlay approaches.
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Old 5th Feb 2019, 17:59
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Put another way, the "FMGS lateral and Vertical guidance" is non-precision. You can use it for published RNAV/RNP approaches, you can use it to program/simulate/overlay with other published non-precision approaches (VOR and NDB).

But you cannot (or should not) use it for published precision approaches (ILS, LOC, etc.) - not accurate enough (yet). Skip the RNAV/VNAV, fly the real radio guidance beams (NAV 1 radio).
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Old 5th Feb 2019, 19:10
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You can't fly an "overlay" on a localiser approach. Primary nav source has to be the localiser. And it can't do GBAS.
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