System Maintenance Manual

Page 4-18 G1000/GFC700 System Maintenance Manual – C90A/C90GT/C90GTi King Air
Revision F 190-00682-01
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The G1000 system alerts the operator that the magnetic field database is out of date by issuing the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” (Ref. Section 5.143.2).
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 ‘Dealer Resource Center ’ portion of the web site.
4.7 GSA 8X Greasing Procedure
NOTE: The GSA 80 servo greasing procedure is required only when the GSA 80 is removed and
reinstalled . Re-grease each servo output gear following this procedure.
1. Remove each servo as per Section 5.
2. Using a lint-free cloth, remove excess grease build-up from the single servo output gear
(see Figure 4-1.)
IMPORTANT!
It is not necessary to remove all of the grease from the output gear, only the excess
grease. DO NOT USE SOLVENTS TO CLEAN THE OUTPUT GEAR!
3. Using a brush or other applicator, apply a thin coat of Aeroshell 33MS (Lithium-complex based)
grease to the servo output gear.
4. Reinstall each servo as per Section 5.
Figure 4-1. Servo Gear