Garmin Diamond DA 40 Maintenance Manual page 61

b) If any CAL VAL value is outside of the specified ranges, the fuel quantity system requires
service.
4.8 GRS 77 Earth Magnetic Field Updates
The GRS 77 utilizes an Earth magnetic field model which is updated once every five years. The update is
expected to be available from Garmin in each of the following years: 2005, 2010, 2015, and every five
years thereafter, so long as the GRS 77 remains a Garmin-supported product.
The G1000 system alerts the operator that the magnetic field database is out of date by issuing the
message "AHRS SERVICE – AHRS Magnetic-field model needs update" (Ref. Section 5.11). Contact
Garmin for update instructions.
G1000/DA 40 System Maintenance Manual Page 4-11
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