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Garmin GTN 650 Manual

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GTN 6XX/7XX AML STC Installation Manual 190-01007-A3
Page 2-28 Rev. 4
2.4.9 External Annunciators
Installations completed in accordance with the requirements specified in this manual may not require the
use of any external annunciators, since all annunciations are provided on the GTN unit’s front panel.
Refer to Section 2.4.10.1.1 to determine whether or not external annunciators are required.
If external GPS annunciators are required as part of the GTN installation, the preferred annunciator is the
Mid-Continent MD 41-151X, as shown in Figure E-7. The MD 41-151X provides SUSP annunciations
when the GTN is in Suspend Mode. Suspend mode is active when the GTN is not automatically
sequencing waypoints.
The annunciator panels designed for the Garmin 400/500 series units, such as the MD41-14XX,
annunciate OBS mode but do not annunciate Suspend mode. If it is desired to use a pre-existing MD41-
14XX, wiring changes will be required as outlined in Figure E-7. A placard must also be installed with
the following text: ‘Green OBS indicates OBS or SUSP mode – GTN annunciator bar indicates which is
active. Push OBS button to change OBS or SUSP mode.’ The placard must be located immediately
adjacent to the annunciator panel and must meet the requirements outlined in Section 2.4.5.
2.4.10 Unit Mounting Considerations
2.4.10.1 GTN Mounting Considerations
The GTN unit is designed to mount in the avionics stack in the aircraft instrument panel within view and
reach of the pilot. The primary unit location should minimize pilot head movement when transitioning
between looking outside of the cockpit and viewing or operating the GTN. The location should be such
that the GTN unit is not blocked by the glare shield on top, or by the engine controls, control yoke, etc. on
the bottom. If the aircraft has a throw-over yoke, ensure that it does not interfere with the GTN.
For VFR-only installations, the GTN unit must be mounted in the aircraft manufacturer’s approved
location or other FAA approved location. No CDI/HSI interface is required but if provided, proper source
selection annunciation must be used.
In accordance with AC 20-138A, for IFR GPS installations the GTN unit must be mounted in the aircraft
manufacturer’s approved location or other FAA approved location, and the required CDI/HSI must be
mounted in the primary field of view. CDI/HSI navigation source selection annunciation must be on or
near the affected display and any additional annunciations must be mounted within the normal field-of-
view.
An FAA issue paper was written to clarify the TSO-C146c annunciation requirement of “…on or near the
affected display.” This issue paper said, in order to preclude the need for external source selection
annunciations (i.e. using the annunciation within the GTN unit), the source selection annunciation
displayed on the GTN unit must be within 13.9 inches of pilot view centerline. If the CDI is to the left or
right of centerline, it must favor the same side as the GTN unit placement (i.e. typically the radio stack is
on the right of the pilot’s view centerline, so the CDI should be on the right side of the basic primary
flight instruments). A CDI/HSI with a built-in annunciation may also be used in lieu of a separate external
annunciator to satisfy the source selection annunciation requirement. In addition, any required GPS
navigation annunciations must be within 16.8 inches of the pilot view centerline. If the GTN unit display
is within this area, then no external GPS navigation annunciations are required.
The GTN unit, as a redundant or secondary TSO-C146c certified navigation device, may be installed
outside the acceptable view parameters if the unit is used as a backup system. Example: To the right of a
center radio stack, when two columns of avionics are available. This places the unit too far from the
pilot’s normal scan. As such, IFR flights may not originate or be predicated on this unit unless the
primary system has failed.
… 70 …


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