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7 votes

What is the difference between SBAS and SBAS PA mode on my FMS?

SBAS PA = Precision approach. Navigation integrity is assured by a satellite-based monitoring system like the WAAS system, and the monitoring meets requirements for SBAS approaches (LPV) as described ...
RealAnswersNotAI's user avatar
6 votes
Accepted

Why does GBAS broadcast Final Approach Segment data when SBAS does not?

The reasons GBAS and SBAS are the way they are goes back to decisions made in the early 1990's when the concepts were first proposed. When the push started for satnav approaches it was obvious that ...
Gerry's user avatar
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3 votes
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Why are SBAS-equipped planes exempt from the preflight prediction check?

The slide refers to ADS-B integrity, which requires a different integrity level than RNP. The ADS-B preflight check they refer to is a different than the check for RNP. The FAA requires an integrity ...
DeltaLima's user avatar
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2 votes
Accepted

Does transition to SBAS or GBAS navigation require alignment of the intermediate segment with final segment?

I've never seen an SBAS approach that had more than one intermediate segment. In all cases, the IAF/IF is aligned and more than 2 NM from the FAF. There may be multiple IAFs that feed directly to the ...
Gerry's user avatar
  • 20k
1 vote

Why does GBAS broadcast Final Approach Segment data when SBAS does not?

The GBAS method allows for more dynamic implementations than the database method. Databases are updated only on the AIRAC cycle date, and getting a change through requires months of preparation ...
DeltaLima's user avatar
  • 83.6k

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