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ADS-B Preflight Requirements updated for GA

 
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harleydixon



Joined: 17 Sep 2016
Posts: 18
Location: Henrietta, NY

PostPosted: Wed Jul 17, 2019 7:15 am    Post subject: ADS-B Preflight Requirements updated for GA Reply with quote

Just saw this on AVWeb...

The FAA will issue a Notam on Thursday that will essentially exempt general aviation aircraft operators from an ADS-B preflight requirement when the ADS-B mandate kicks in next January. The Notam specifically exempts ADS-B Out transmitters that use WAAS GPS receivers as a position source from the preflight requirement described in an FAA policy statement that was released earlier this month. The Notam reads: “It is not necessary for operators of aircraft equipped with the Wide Area Augmentation System (WAAS) (TSO−C145 or TSO−C146) receivers to conduct a preflight availability prediction.”

Garmin spokesman Bill Stone told AVweb the preflight requirement was always intended for airliners, most of which have early-generation GPS systems that are not as reliably precise as those with WAAS. All ADS-B units certified for GA aircraft for the 2020 mandate must use a WAAS GPS receiver as a position source. “There are currently zero non-WAAS based ADS-B Out GPS solutions for general aviation aircraft,” he said. “For GA, it’s a non-issue.” Stone said he suspects the WAAS exemption got lost in the extensive vetting process that policy statements like the preflight requirements included in the recent Federal Register Notice go through. The original intent of the policy statement was to codify exemptions from sanctions for airlines when GPS signals degrade after they’ve done the preflight checks and the subsequent lack of compliance is beyond their control.

Harley


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PostPosted: Thu Jul 18, 2019 6:01 pm    Post subject: ADS-B Preflight Requirements updated for GA Reply with quote

Correct me if I'm wrong, I believe WAAS is a type of SBAS (Satellite Based
Augmentation System), and reading AC-90-114a already says this:

c. GPS Performance Prediction. Operators flying aircraft equipped with SBAS
(TSO-C145 or TSO-C146) receivers do not need to conduct a preflight
availability prediction
because the FAA will issue a NOTAM whenever SBAS performance is not
adequate. If
TSO-C129() or TSO-C196() equipment is used for ADS-B Out, NACp and NIC
availability
prediction should be performed for the intended route of flight (route and
time) using available
GPS satellite information.
So, my interpretation is:

You need:
1. “All available information concerning flight” (§ 91.103) (the standard
catch-all)
2. Check NOTAMS for SBAS outages.

-Jeff-
On Wed, Jul 17, 2019 at 9:23 AM Harley Dixon <harley(at)agelesswings.com>
wrote:

[quote] Just saw this on AVWeb...

The FAA will issue a Notam
<https://www.faa.gov/nextgen/equipadsb/resources/media/guidance_adsb_out_operations.pdf>
on Thursday that will essentially exempt general aviation aircraft
operators from an ADS-B preflight requirement when the ADS-B mandate kicks
in next January. The Notam specifically exempts ADS-B Out transmitters that
use WAAS GPS receivers as a position source from the preflight requirement
described in an FAA policy statement that was released earlier this month


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