Today's Message Index:
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1. 04:18 PM - Static system tests (Kelly McMullen)
2. 05:53 PM - Re: Static system tests (ornerycuss2001)
Message 1
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| Subject: | Static system tests |
I recently came upon a question that I don't find a clear answer in
91.411 or 91.413. Aircraft in question is either ELSA or E-AMB, built
for VFR only. It is based under Mode C veil, and may have need to fly
transitions through Class B, so it has to have ADS-B Out.
The question is what level, if any, of certification the static system
needs to assure that the ADS-B altitude reported is accurate?
I am thinking a leak check at a minimum, but don't see any clear
requirement. I would appreciate your thoughts on the subject.
Message 2
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| Subject: | Re: Static system tests |
91.217b requires that the pressure altitude for the transponder and ADSB come from
the same source. Finding no other requirement for ADSB by itself it seems
reasonable that a static system check for the transponder would be sufficient.
I believe ADSB transmits both pressure altitude and GPS altitude. I'm guessing
any large discrepancy would be flagged by the ADSB ground system and a (computer
generated) letter of correction would be sent to the registered owner.
FWIW, I just had my static system and transponder checked (transponder is also
the ADSB box) and no separate check was performed for ADSB altitude information.
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Original Message
On Monday, July 13, 2020 4:12 PM, Kelly McMullen <kellym@aviating.com> wrote:
>
> I recently came upon a question that I don't find a clear answer in
> 91.411 or 91.413. Aircraft in question is either ELSA or E-AMB, built
> for VFR only. It is based under Mode C veil, and may have need to fly
> transitions through Class B, so it has to have ADS-B Out.
> The question is what level, if any, of certification the static system
> needs to assure that the ADS-B altitude reported is accurate?
> I am thinking a leak check at a minimum, but don't see any clear
> requirement. I would appreciate your thoughts on the subject.
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