(2022) Service Bulletin 22068 Rev A: GI 275 Multi-function Instrument System TSO Software Version 2.53

PRODUCTS AFFECTED:

Garmin GI 275 Multi-function Instruments with System Software Version 2.52 or earlier are affected.

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: This Service Bulletin may be incorporated at the owner’s discretion.

PURPOSE:

GI 275 Multi-function Instrument System Software Version 2.53 provides the following updates:

• New DC motor trim gain setting configuration options for GFC 500 configurations
• New PFD Sync serial RS-232 configuration for G3X Touch™ Interface
• Improves Battery charge inhibit messaging
• Reduces the Radar Altimeter Decision Height (DH) re-arming logic for Rotorcraft Configurations
• Includes an optional 100ft / 30m Radar Altimeter aural callout for Rotorcraft Configurations