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Boyington

5th Feb 2019 08:11

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?

Flaps0

5th Feb 2019 09:03

Quote:

Originally Posted by Boyington (Post 10380709)

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.

pattern_is_full

5th Feb 2019 16:59

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).

FE Hoppy

5th Feb 2019 18:10

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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