That's excellent. For the record, attached is a letter of compliance that we created for customers that are asked this question.
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Altitude Reporting Compliance Statement for Dynon EFIS systems
Dynon’s EFIS-based systems models EFIS-D10, EFIS-D10A, EFIS-D100, FlightDEK-D180 and SkyView
system comply with FAR 91.217 subpart (b), thus satisfying FAA criteria for use in the Experimental and Light
Sport Aircraft categories.
All Dynon systems referenced above may be tested in accordance with FAR 91.411 per subparts (b)(2) & (b)(3)
and comply with Appendix E – Altimeter System Test and Inspection paragraph (c). See special instructions
below.
Background
Each of Dynon’s EFIS systems has an integrated air data computer and altitude encoder that are software
linked resulting in identical numerical values. The altitude reported to the transponder is always referenced to
pressure altitude (29.92” Hg). Setting the EFIS altimeter barometer to the pressure altitude value will cause the
altimeter to directly display the value being reported to the transponder.
Special Instructions
1) To set the altimeter barometer setting to 29.92” in any of the D10/D100 series devices, press any one of the
middle buttons to bring up the menu system. Next press the button under the BARO menu, then 29.92, then
BACK and finally EXIT. In the SkyView system, use either of the value knobs to select BARO as the controlled
parameter, then rotate the dial to adjust the indicated barometer setting value.
2) When pressure checking any aircraft equipped with Dynon’s special dual ported AOA/Pitot, please note that
this pitot design deliberately has a pin-sized leak hole in each of the two tubes (one each for Pitot & AOA) to
permit draining moisture which might accumulate inside. These holes are located in the middle of the tube at
the bottom. Plugging these holes does not guarantee a pneumatic seal (although one is sometimes present).
The leak that may exist does not affect the performance of the probe but must be taken into account when
doing pressure/leak tests on the pitot system.
3) If the altimeter or altitude encoder output are found to be out of specification, the following single-point
adjustment can be performed by navigating the menus to SETUP>ALTADJ in the D10/D100 series devices or
to HARDWARE CALIBRATION > ADAHRS CALIBRATION > ALTITUDE ADJUST in the SkyView series
devices. In the Altimeter Adjustment menu, the displayed value together with the corresponding encoder output
can be adjusted +/- 500 feet. After making this adjustment, ensure that the altimeter on the instrument meets
the tolerances allowed between 0 and 30,000 feet. If this adjustment does not bring the altimeter on the
instrument to within specification at all attitudes, please contact Dynon Avionics to return for service.
