Le 22/02/2018 12:57, John Wighton a crit:
>
> The alternate static source when switched with this type of (2 way switch)
> will
supplement the original static source - not replace it.
>
> A 3-way switch which selects from either Source A or Source B seems to be a
> requirement
for some aircraft (l know this may not be applicable to the LAA).
>
Hello,
Here is what 14 CFR 23.1325 - Static pressure system says :
https://www.law.cornell.edu/cfr/text/14/23.1325
>
> (c) Except as provided in paragraph (d)
> <https://www.law.cornell.edu/cfr/text/14/23.1325#d> of this section,
> if the static pressure system incorporates both a primary and an
> alternate static pressure source, the means for selecting one or the
> other source must be designed so that -
>
> (1) When either source is selected, the other is blocked off; and
>
> (2) Both sources cannot be blocked off simultaneously.
>
> (d) For unpressurized airplanes, paragraph (c)(1)
> <https://www.law.cornell.edu/cfr/text/14/23.1325#c_1> of this section
> does not apply if it can be demonstrated that the static pressure
> system calibration, when either static pressure source is selected, is
> not changed by the other static pressure source being open or blocked.
>
--
Best regards,
Gilles
http://contrails.free.fr
http://lapierre.skunkworks.free.fr
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