(2017) Service Bulletin 1756 Rev A: GTR 225/GNC 255 Display Software Version 2.20, COM Software Version 2.30, and NAV Software Version 6.03

PRODUCTS AFFECTED:

The units listed below with display software version 2.12 or earlier are affected by this bulletin.
GTR 225 (011-02718-00)
GTR 225A (011-02807-00)
GTR 225B (011-02808-00 or 011-02808-20)
GNC 255A (011-02806-00)
GNC 255B (011-02719-00 or 011-02719-20)

CERTIFICATION APPROVAL:

TSO Authorization

COMPLIANCE:

Optional

PURPOSE:

Display Software Version 2.20, COM Software Version 2.30, and NAV Software Version 6.03 contains the following changes:

• Add ability for dealer to enable/disable a NAV receiver rotorcraft modulation filter.
• Add ability for dealer to adjust the COM radio carrier squelch.
• Prevent intercom status updates while COM radio is transmitting.
• Reduce the occurrence of NAV Needs Service messages due to transient events.