[RV8iator]

I was looking over the 650 install manual and found this paragraph

3.2.3 IFR GPS Plus VOR/LOC/GS Installation
Minimum GTN unit installation requires the following items for an IFR VOR/LOC/GS installation:
GTN 650 (installed in the aircraft manufacturer approved location) GPS antenna, NAV antenna, and COM antenna.
An external CDI/HSI indicator must be installed in the pilot?s primary field-of-view (or in the aircraft manufacturer approved mounting location). The indicator must have a vertical deviation indicator for glideslope, localizer and VNAV operations/approaches.
A second GPS Navigator or a VHF NAV radio

The last sentence got my attention. It says to use the 650 for IFR flight a second GPS or VHF Nav is required.

I know we all have several GPS's in our planes, but mostly not certified. Is a second CERTIFIED GPS/Nav receiver required to be legal for IFR?

Would some of you Avionics guru's opine here?

 

[bnt83]

There are several different installation manuals out there, all tailored in a bit different way, depending on what type/category aircraft (part 23, part 25 etc) they are being installed in.

This is from the part 23 AML STC Installation manual:

For an IFR installation of a GTN 650 or GTN 750, the criteria in Section 2.5.1.1 must be met in addition to the following:

If the GTN is installed for GPS primary navigation, then the GTN must be interfaced to a navigation indicator installed in the pilot’s primary field-of-view (or in the aircraft manufacturer approved mounting location). The indicator must have a vertical deviation indicator (GS) in order to perform approaches with vertical guidance. EFIS, EHSI, and NAV Indicators approved by this STC are listed in Appendix C.

If the GTN does not meet the field-of-view requirements outlined in Section 2.5.10, then remote source selection annunciators must be installed. The GTN provides these annunciations if mounted within the required field of view.

A second GPS navigator (Garmin or non-Garmin) is required if the aircraft requires GPS coaxial cable overbraid (reference Appendix G).

Either a second GPS navigator (Garmin or non-Garmin) or a separate VHF navigation radio (Garmin or non-Garmin) is required in the following installations:

◦ Aircraft with a maximum certified gross takeoff weight of greater than 6000 pounds.
◦ Turbine-powered aircraft.
◦ Multi-engine aircraft.
◦ Installations in which a CDI is connected to connector P1004 pin 29 (Reference Figure E-9,
Figure E-10, and Figure E-11), and there is no other way of displaying VHF navigation deviation information from the GTN 650/750. This is not required for installations which have a CDI or HSI connected to the Main connector P1001, which can be switched to output either GPS or VHF navigation information.

 

[RV8iator]

I knew there had to be more to the story. Thanks for the info.