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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

Posted: Wed Jul 17, 2019 7:15 am Post subject: ADS-B Preflight Requirements updated for GA

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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_________________
Harley Dixon

Long EZ N28EZ
Canandaigua Airport (D38)
Canandaigua, NY

loboflyer(at)gmail.com
Guest

Posted: Thu Jul 18, 2019 6:01 pm Post subject: ADS-B Preflight Requirements updated for GA

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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