What instruments are required for Experimental aircraft? Answer: NONE!
This trips up a lot of DAR’s and FSDO’s. They quote 91.205, which says: § 91.205 Powered civil aircraft <https://www.law.cornell.edu/definitions/index.php?width=840&height=800&iframe=true&def_id=2810380138e0a0dfc90733097a59235a&term_occur=999&term_src=Title:14:Chapter:I:Subchapter:F:Part:91:Subpart:C:91.205> with standard category U.S. airworthiness certificates: Instrument <https://www.law.cornell.edu/definitions/index.php?width=840&height=800&iframe=true&def_id=7fe5a7765bc41dd93adc4e9d5f03ea31&term_occur=999&term_src=Title:14:Chapter:I:Subchapter:F:Part:91:Subpart:C:91.205> and equipment requirements. (a) General. Except as provided in paragraphs (c)(3) and (e) of this section, no person <https://www.law.cornell.edu/definitions/index.php?width=840&height=800&iframe=true&def_id=0dc5e415556e65322f1454c927515578&term_occur=999&term_src=Title:14:Chapter:I:Subchapter:F:Part:91:Subpart:C:91.205> may operate a powered civil aircraft <https://www.law.cornell.edu/definitions/index.php?width=840&height=800&iframe=true&def_id=2810380138e0a0dfc90733097a59235a&term_occur=999&term_src=Title:14:Chapter:I:Subchapter:F:Part:91:Subpart:C:91.205> with a standard category U.S. airworthiness certificate in any operation described in paragraphs (b) through (f) of this section unless that aircraft <https://www.law.cornell.edu/definitions/index.php?width=840&height=800&iframe=true&def_id=8e9caab04f792d93d0738c9d3290164e&term_occur=999&term_src=Title:14:Chapter:I:Subchapter:F:Part:91:Subpart:C:91.205> contains the instruments <https://www.law.cornell.edu/definitions/index.php?width=840&height=800&iframe=true&def_id=7fe5a7765bc41dd93adc4e9d5f03ea31&term_occur=999&term_src=Title:14:Chapter:I:Subchapter:F:Part:91:Subpart:C:91.205> and equipment specified in those paragraphs (or FAA <https://www.law.cornell.edu/definitions/index.php?width=840&height=800&iframe=true&def_id=df14de7c16e00ca3868915d263954ee7&term_occur=999&term_src=Title:14:Chapter:I:Subchapter:F:Part:91:Subpart:C:91.205> -approved equivalents) for that type of operation, and those instruments <https://www.law.cornell.edu/definitions/index.php?width=840&height=800&iframe=true&def_id=7fe5a7765bc41dd93adc4e9d5f03ea31&term_occur=999&term_src=Title:14:Chapter:I:Subchapter:F:Part:91:Subpart:C:91.205> and items of equipment are in operable condition. This applies only to STANDARD CATEGORY!!! There is no similar regulation that applies to Experimental aircraft. Whether it was an oversight by FAA or not doesn’t matter, this is the regulation. All the instruments under this heading, whether day, night, or otherwise, ALL apply ONLY to Standard Category aircraft. The exception is if a DAR doesn’t know this and writes it on your airworthiness certificate, then whatever they say is required for your aircraft. Many make this mistake, but once on your certificate you’re stuck. Clarify it with your inspector from the very beginning. This verified with a DAR that works at EAA in OSH. You can win a few drinks with this one! Many think this applies to all aircraft, but it doesn’t. ONLY TO STANDARD CATEGORY. Clearly stated in the regulation. That ain’t us! Jim McGauhey Washington State From: KRnet <krnet-boun...@list.krnet.org> On Behalf Of Sid Wood Sent: Saturday, March 26, 2022 7:47 PM To: krnet@list.krnet.org Subject: Re: KRnet> Instrument Panel for my KR2S The Washington FSDO inspector stated in no uncertain words that because I had applied for Day and Night VFR Airworthiness Certification, my KR-2, N6242, in addition to the Dynon D10A with its internal magnetic compass sensor and the remote mounted magnetometer compass sensor, had to have a mechanical wet magnetic compass (with correction card). Accuracy of the three magnetic compasses was not an issue for the FAA inspector; redundancy for safety of flight for Night VFR was the compelling issue. Removing the panel mounted wet compass would have voided the Airworthiness Certificate. A magnetic compass is not required for non-commercial, Day VFR Airworthiness Certification. Sid Wood California, MD, USA From: Chris Pryce via KRnet Sent: Saturday, March 26, 2022 6:09 PM To: KRnet Cc: Chris Pryce Subject: Re: KRnet> Instrument Panel for my KR2S I don't have a magnetic compass and I didn't have any issues with getting my certificate. On Sat, Mar 26, 2022, 14:37 n357cj via KRnet <krnet@list.krnet.org <mailto:krnet@list.krnet.org> > wrote: Hey Guys, I was watching some videos with my coffee this morning on instrument panels and one guy mentioned that if with a glass panel you have a magnetometer installed you don't need a wet compass... so did he mean that because they are accurate and not needed or is the wet compass replaced in the FAA's eyes for inspection purposes. I had a magnetometer with the D10a installed in 357CJ and it was completely accurate but at no time did I think that legally I could have removed the panel mounted compass. Joe Horton
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