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Garmin GTN 650 Manual

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190-01007-A3 GTN 6XX/7XX AML STC Installation Manual
Rev. 4 Page 2-29
If the GNS 400W/500W is installed concurrently with a GTN 6XX/7XX, there are special mounting
guidelines. The GTN crossfills flight plan and user waypoint data to the GNS. Since the data flows from
the GTN to the GNS, it is recommended that the GTN be mounted in the #1 position relative to the GNS
in a GTN/GNS installation. In a typical radio stack, this would be above the GNS. This recommendation
is only applicable if the GTN-GNS crossfill function is utilized in the installation.
2.4.10.1.1 Determination of Acceptable Field of View
The FAA has determined that the acceptable field-of-view for TSO-C146c annunciations related to
navigation source selection is approximately ±30° horizontally from the center of the attitude indicator (or
centerline of the pilot’s seat/yoke), and that the acceptable field-of-view for TSO-C146c annunciations
related to GPS navigation data is approximately ±35° horizontally from the center of the attitude
indicator. These angles are based on the closest panel distance of 24 inches resulting in a measured offset
from the attitude indicator of 13.9 inches and 16.8 inches respectively.
The acceptable vertical field-of-view includes the area from the top of the instrument panel to the portion
of the instrument panel that is immediately below the basic ‘T’ instruments. For an IFR-approved GPS
installation, either (i) the GTN unit must be located within the ±35° horizontal acceptable field-of-view or
(ii) source selection and GPS annunciations are required to be installed. If the GTN unit is installed
between ±30° and ±35°, at a minimum, source selection annunciation must be installed. Note that
Figure 2-15, Figure 2-16, and Figure 2-17 show a GTN 7XX. The dimensions shown in these drawings
are also applicable to the GTN 6XX. If the GTN is installed within ±30°, no external annunciations are
required.
NOTE
If a GTN is installed with an external EFIS in the primary field of view that provides the
annunciations discussed in the following sections, then separate external annunciators are
not required. The GDU 620 provides all of the annunciations required by these sections.
2.4.10.1.2 Source Selection Annunciation
Use the steps below to determine whether or not the integrated source selection annunciation displayed on
the GTN unit to be installed is within the acceptable field-of-view. See Figure 2-15.
1. Determine the pilot’s primary view centerline, utilizing the following criteria:
o For aircraft with a basic “T” instrument configuration with the attitude indicator in the
upper center location, the center of this instrument should be used as the primary view
centerline.
o If the basic “T” is offset away from the radio stack with respect to the control yoke or a
non-standard instrument cluster is present in the aircraft, the center of the control yoke or
stick in the neutral position may be used as the primary view centerline.
o If the control yoke/stick is offset from the center of the pilot’s seat, an imaginary line
extended through the center of the pilot’s seat may be used as the primary view centerline.
2. Measure the horizontal distance from the primary view centerline to the left or right edge of the
GTN unit, as appropriate.
3. If the GTN unit is mounted to the right of the primary instruments, the internal display of
annunciation within the GTN is considered to be within the acceptable field-of-view if the
following criteria are met:
o The left edge of the GTN unit bezel is within 10.6 ± 0.25 inches of the primary view
centerline and;
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