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G1000 / GFC 700 System Maintenance Manual - 300/B300 Series King Air
Revision 1
190-00716-01
TIP: If 1 amp reference current cannot be maintained, note the difference between the attainable current
and 1 amp reference current. Calculate the percentage difference and apply this to the voltage reading to
obtain the equivalent resistance. Example: If the measured current is 1.2 amps, (20% high from the target
1 amp current), then the allowable voltage measurement would be 20% high, 2.5 milli-volts would now
be 3.0 milli-volts.
4.6
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: 2010, 2015, and every five years
thereafter, as 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The G1000 system alerts the operator that the magnetic field database is out of date by issuing the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”. Garmin will distribute update
instructions when updates are available. As of this writing, Garmin Service Bulletin #0533 addresses the
most recent update to the 2005 database. Service Bulletins may be obtained from
www.garmin.com
at
the ‘Delear Resource Center’ portion of the web site.
4.7
GSA 80 Greasing Procedure
The GSA 80 servo greasing procedure is required only when the GSA 80 is removed and reinstalled
(pitch, pitch trim and roll axes). Refer to Section 6.11 for details.
Summary of Contents for Cessna Caravan G1000
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