Backup Communications Path Checks; Table 5-2, Svs-Related Alert Messages - Garmin G1000 NXi Supplemental Maintenance Manual

Failure Message
SVS – SVS DISABLED: Out of
available terrain region.
5.4

Backup Communications Path Checks

Overview
The G1000 system architecture is designed with redundant communication ports for several
LRUs so that critical information can continue to be displayed in the event of an equipment or
wiring failure. Of most importance is flight attitude, heading, and air data information. The GSU
75 (if installed) has two separate ARINC 429 data lines which are all capable of sending data to
the displays. The GTX 335R or GTX 345R (if installed) have two redundant serial
communication paths for the same purpose. See the Cessna Nav III Line Maintenance Manual
for a basic G1000 block diagram depicting this architecture. Several other diagrams are shown
later in this section for illustrative purposes. When troubleshooting, refer to the G1000 Wiring
Diagram listed in Table 1-1.
Refer to Section 9.8 for procedures on checking the status of each configured
G1000 / GFC 700 backup data path.
G1000 Supplemental Maintenance Manual
Textron Nav III Series
190-02128-04

Table 5-2, SVS-Related Alert Messages

Cause
SVS is disabled because the
aircraft exceeded the boundaries
of the loaded terrain database.
NOTE
Solution
Geographical operation limitations are
defined in the AFMS listed in Table 1-1.
Ensure that operations are within this
geographic area.
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