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GRS 7800 AHRS units installed in G1000 equipped King Air 200/B200/300/B300 series aircraft are affected.
Heading and/or attitude information may become unavailable when flying north of 65° North latitude.
To prevent the potential loss of attitude and heading displays, activate DG Free Mode during the following circumstances:
· When flying north of 65° North latitude
· Immediately after power on when taking off from a location that is north of 65° North latitude
To activate DG Free Mode (see Figure 1):
1. Press the PFD Softkey.
2. Press the HDG MODE Softkey.
3. Press the DG FREE Softkey to activate DG Free Mode. Press the DG SLAVE Softkey to deactivate DG Free Mode.
Contact your local Garmin dealer for implementation of Garmin Service Bulletin 1464.
This issue will be resolved in a later software release.
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