Installation Instructions

GTN 6XX/7XX AML STC Installation Manual 190-01007-A3
Page 2-12 Rev. 4
2.4 Installation Considerations
2.4.1 Minimum System Configuration
The following section describes the minimum configuration required for IFR and VFR installations of the
GTN.
2.4.1.1 VFR GPS Installation
The minimum GTN unit installation requires the following items for a VFR Installation:
• GTN 6XX/7XX unit (installed in the aircraft manufacturer approved location for 6.25 inch wide
avionics equipment).
• GPS/WAAS antenna required for GPS navigation functions.
• An external CDI and proper source selection annunciation are required for installations using the
VOR navigation and glideslope information. If the GTN does not meet the field-of-view
requirements outlined in Section 2.4.10.1.1, then remote source selection annunciators must be
installed. The GTN provides these annunciations if mounted within the required field of view.
• A NAV antenna is required for VHF NAV functions. (GTN 650/750 only).
• A COM antenna is required for COM functions. (GTN 635/650/750 only).
VFR installations must be placarded “GPS LIMITED TO VFR USE ONLY” in clear view of the pilot.
The placard must be located immediately adjacent to the GTN. See Section 2.4.6 for additional placard
requirements. VFR GPS installations should use the VFR GPS Limited Airplane Flight Manual
Supplement for Garmin GTN 6XX/7XX GPS/SBAS Navigation System (P/N 190-01007-A5).
2.4.1.2 IFR Installation of a GTN 625/635/725
For an IFR installation of a GTN 625, GTN 635, or GTN 725, the criteria in Section 2.4.1.1 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.
• 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) must be installed. See the following section if installing a GTN 650 or
GTN 750.
For installations meeting these requirements, use the Airplane Flight Manual Supplement for Garmin
GTN 6XX/7XX GPS/SBAS Navigation System (P/N 190-01007-A2).