Is it possible to turn this down or off?

A King Air 90 operator transitioning to a G1000-equipped aircraft has encountered a persistent audio configuration asymmetry between the system's dual display units, where the TAWS SYSTEM TEST OK announcement at generator-on produces a full-volume audio blast despite successful volume attenuation on the primary MFD. The core technical problem stems from the G1000's dual-display architecture: configuration changes made in maintenance mode on the left-side MFD do not propagate to the right-side MFD, and the right-side unit's configuration menu lacks the same volume control options available on the left. When external power through the generators brings the right-side MFD fully online, its default audio settings override any adjustments made to the left unit, resulting in the unwanted startup announcement at maximum volume.

This issue reflects a nuanced but operationally significant aspect of the Garmin G1000 NXi and legacy G1000 installations in multi-engine turbine aircraft: each display unit maintains its own configuration state, and certain alert audio parameters are tied to specific LRUs (Line Replaceable Units) or audio panel assignments rather than a single system-wide setting. In King Air installations specifically, the audio environment is further complicated by dual audio panels and cross-side softkey assignments. The right-side MFD's reduced configuration menu is not a bug but rather a design characteristic—some G1000 installations deliberately restrict the co-pilot-side configuration menu to prevent inadvertent changes to certified system parameters. Operators new to G1000-equipped King Airs should be aware that avionics shops with Garmin dealer authorization and King Air-specific G1000 experience are essential for resolving this type of issue, as the fix may require a software configuration file update pushed to both displays simultaneously via the SD card loader, or a wiring-level review of which audio panel output is driving the TAWS announcement on generator bus energization.

From a broader operational standpoint, the TAWS self-test audio at startup is a certified system behavior mandated to confirm terrain awareness system functionality to the flight crew, and any attempt to fully silence it must be carefully evaluated against FAA or EASA approval baselines for the specific STC or type certificate data sheet governing that G1000 installation. Volume reduction is generally permissible within configuration limits, but complete suppression of TAWS annunciations—even during ground test—can implicate airworthiness compliance. Operators should consult the applicable G1000 Pilot's Guide, the aircraft-specific G1000 installation manual, and potentially a Garmin-authorized avionics technician before making further changes in configuration mode, as certain parameters are protected precisely because they are tied to the aircraft's TSO and TAWS certification basis.

This situation is a practical illustration of the growing complexity maintenance departments face when turbine operators acquire glass-cockpit aircraft previously operated under different configurations or by different flight departments. Unlike steam-gauge King Airs where audio panel behavior is largely governed by discrete wiring, G1000 audio routing involves software-defined logic that can behave differently across software versions, installation variants, and fleet-specific customizations. Flight departments acquiring G1000-equipped aircraft—whether King Airs, Dauphin replacements, or other turboprops—are well advised to budget for an initial avionics review by a Garmin-authorized shop, obtain all configuration data cards and software version documentation from the previous operator, and verify that any configuration changes are logged in the aircraft records and reviewed by an appropriately rated AME or IA before return to service.