Figure 3-6, Garmin Unit S/N Location; Table 3-1, Garmin Unit S/N Prefixes - Garmin G1000 NXi Supplemental Maintenance Manual

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Third party avionics equipment interfaced to G1000 (ADF, DME, non-Garmin traffic
systems, WX-500, etc.). To determine if the third party equipment is installed, check the
circuit breaker panel for circuit breakers for the units, and check for G1000 controls for
the third party devices.
Determining Installed Garmin Units
Use the table below to determine what the unit part number is based on the unit's serial number
reported on the MFD Aux - System Status page in Normal mode or PFD System Status page in
Config mode. This table lists the units that have different loader card option files so the installer
can choose the correct file without requiring the unit to be physically inspected.
Unit
GDC 74 Air Data Computer
GRS 77 AHRS
GSU 75 ADAHRS
GTX 33 Transponder
GTX 335R Transponder
GTX 345R Transponder
GDL 69A Legacy XM
GDL 69A SXM
GTS 800 Traffic Unit
G1000 Supplemental Maintenance Manual
Textron Nav III Series
190-02128-04

Table 3-1, Garmin Unit S/N Prefixes

Figure 3-6, Garmin Unit S/N Location

Serial Number First Three Digits
438 or 1SW
420
3KY
891 or 848
3EF
3EH
477
3NV
15L
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