dvukovic wrote:
I could save some extra money on the EIS option as well by connecting it to the experimental G3X
Exactly. Today, Garmin do indeed sell certified versions of the G3X. In the P2008, the uncertified G3X could be replaced by a certified G3X and the small certified combined HSI/ASI/Alt could be removed entirely. But:
A certified G3X sounds nicer on the paper than in reality IMO.
I have no idea if they talk with each other though, the certified and uncertified version.
This is a bit interesting when reading Part-NCO. Obviously the aircraft manufacturers have been thinking. NCO.IDE.A.100:
(a) Instruments and equipment required by this Subpart shall be approved in accordance with the
applicable airworthiness requirements if they are:
(1) used by the flight crew to control the flight path;
(2) used to comply with NCO.IDE.A.190;
(3) used to comply with NCO.IDE.A.195; or
(4) installed in the aeroplane.
But later in (c)
(c) Instruments and equipment not required by this Subpart as well as any other equipment that is
not required by other applicable Annexes, but is carried on a flight, shall comply with the
following:
(1) the information provided by these instruments or equipment shall not be used by the
flight crew to comply with Annex I to Regulation (EC) No 216/2008 or NCO.IDE.A.190 and
NCO.IDE.A.195; and
(2) the instruments and equipment shall not affect the airworthiness of the aeroplane, even
in the case of failures or malfunction.
The related GM:
GM1 NCO.IDE.A.100(c) Instruments and equipment — general
NOT REQUIRED INSTRUMENTS AND EQUIPMENT THAT DO NOT NEED TO BE APPROVED IN
ACCORDANCE WITH THE APPLICABLE AIRWORTHINESS REQUIREMENTS, BUT ARE CARRIED ON A
FLIGHT
(a) The provision of this paragraph does not exempt any installed instrument or item of equipment
from complying with the applicable airworthiness requirements. In this case, the installation
should be approved as required in the applicable airworthiness requirements and should comply
with the applicable Certification Specifications.
It all ends up in a reversed catch 22 kind of situation. The (uncertified) G3X is NOT an equipment in need of complying to any airworthiness requirements, simply because it doesn’t (and never will, being uncertified). The only requirement is in case of malfunction: It shall not adversely affect safety or airworthiness of the aircraft.
For VFR this is no problem as long as the aircraft has certified equipment as listed in NCO.IDE.A.120. Likevise for IFR: NCO.IDE.A.125. However, for IFR there is also (a)(3). Together (100 and 195) defines IFR nav equipment to be certified. Still, if you are able to navigate after that equipment, it doesn’t prohibit the use of an uncertified G3X + a GTN 650 or similar. If this is a better/cheaper solution that a fully certified flight deck? I have no idea. It probably may, and may not depending on the aircraft.
