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(2022) Service Bulletin 22048 Rev A: GDU 620 TSO Software Version 7.41
PRODUCTS AFFECTED:
The following units are affected:
| Model | Appliance P/N |
| GDU 620 Display, Black Bezel | 011-01264-0( ) |
| GDU 620 Display | 011-01264-1( ) |
| GDU 620 Display, Black Bezel, Right Hand | 011-01264-2( ) |
| GDU 620 Display | 011-01264-3( ) |
| GDU 620 Display, Black Bezel | 011-01264-5( ) |
| GDU 620 Display, Black Bezel, Right Hand | 011-01264-6( ) |
CERTIFICATION AUTHORIZATION:
TSO Authorization
TSO Authorization does not provide installation airworthiness approval. Separate installation airworthiness approval is required for type-certified aircraft. Notification of revision to any Garmin STC(s) will be provided under a separate service bulletin.
COMPLIANCE:
Optional: TSO Service Bulletin 22048 may be incorporated at the owner’s discretion.
PURPOSE:
GDU 620 software version 7.41 contains the following changes:
- Added Smart Glide™ capability when interfaced to a GTN™ Xi with Software Version 20.20 or later
- The display is now capable of annunciating situations where 3 vertical modes are armed with GFC 500