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Service Bulletin 2048
Page 1-10
April 24, 2020
Revision B
SERVICE BULLETIN
(Non-Certified Aircraft)
NO.: 2048 Rev B
TO:
Non-Certified Aircraft Owners Performing the Subject Upgrade
DATE:
April 24, 2020
SUBJECT:
GPS 175/GNX 375/GNC 355 Main Software Version 3.10
REVISION B:
Added GNX 375 Steps
CERTIFICATION
AUTHORIZATION:
TSO Authorization Software for Non-Certified Aircraft (see Approval section
for details)
______________________________________________
Note: This Service Bulletin is provided solely for the purpose of installing the Subject software in
non-certified aircraft. This Service Bulletin is not intended for software installation on certified aircraft whose
maintenance must be performed by persons authorized in accordance with 14 CFR 43.3. This software update
is NOT an owner/operator eligible activity as “preventative maintenance” under 14 CFR 43 for FAA certified
aircraft. Non-certified aircraft owners who, upon reviewing these instructions, do not feel qualified to perform
this upgrade without any assistance should contact a Garmin dealer to perform this important upgrade.
PRODUCTS AFFECTED
GPS 175, GNC 355, and GNX 375 products listed below with Main Software Version 3.03 and earlier are
affected:
NOTE
The software installation procedure documented in this bulletin can be used to load
Software Version 3.10 from a newer software version.
Table 1. Products Affected
Model
Appliance P/N
GPS 175
011-04377-00
GNX 375
011-04378-00
GNC 355
011-04956-00
GNC 355A
011-04956-30
