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Aviation Alerts and Advisories

GSR 56 Mod 1


The following units are affected only when the internal heater is enabled:

Appliance P/N – Model
011-02268-00 – GSR 56
011-02268-01 – GSR 56 Enhanced
011-02268-10 – GSR 56H
011-02268-50 – GSR 56 Harsh Environment


TSO Approval


Recommended: Compliance with this service bulletin is recommended for installations with the internal heater enabled.


The GSR 56 includes an optionally enabled internal heater that is specified for operation at temperatures below -20°C. The activation of the internal heater may cause the GSR 56 to power off for approximately one minute.

This could result in CAS or system failure messages and/or indications of “Waiting” on the Iridium Status page.

The GSR 56 functions as intended after the power off.

ASDN Service Bulletin 19102 Rev A