Garmin G1000 NXi, Дополнительное руководство по обслуживанию, Страница: 66 / 171

G1000 Supplemental Maintenance Manual Page 4-6
Textron Nav III Series Revision 3
190-02128-04
Electrical Bonding Procedure
Using one of the two measurement methods in Section 4.4.2 record the bonding measurement
for the following equipment. Some equipment in the list is optional and may not be installed.
Ensure that the PFD unit, and MFD unit test points, no more than 40
mΩ is present. Ensure
that at other unit test points
, no more than 5 mΩ is present.
Pilot Compartment
•
Metal case of PFD: __________
mΩ
•
M
etal case of MFD: __________ mΩ
•
GDL 69A body (182 and 206 only): __________
mΩ
Rear Fuselage and Empennage
•
GDL 69A body (172 only):
__________ mΩ
•
GSU 75 body:
__________ mΩ
•
GTX 335R or GTX 345R body: __________
mΩ
4.5 GSU 75 Earth Magnetic Field Updates
The GSU 75, utilizes an Earth magnetic field model which is updated once every five years.
The update is expected to be available from Garmin every five years, as long as the GSU 75,
remain Garmin-supported products.
The G1000 system alerts the operator that the magnetic field database is out of date by issuing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 updates as part of the navigation database cycle. If the IGRF model in the update is
newer than the model installe
d, a prompt will appear for each GRS/GSU (Select “OK” to update
the IGRF Magnetic Field Model). Use the FM Knob and ENT key to select “OK”.
4.6 G1000 Redundant Connection Check
Perform the following steps to verify the following:
(A) The primary (PRI) and secondary (SEC) power sources for the PFD, GSU (if installed) or
GDC and GRS (if installed).
(B) The GSU (if installed) data path to PFD and MFD.
Note: Section B is not required if a GSU 75 is not installed. Refer to the Cessna Nav III Line
Maintenance Manual for procedures if a GDC 74A and GRS 77 are installed..
(A) PRI and SEC power sources for PFD and GSU (if installed) check
1. Connect a ground power unit to the external power receptacle and turn on the ground
power unit.
2. Set the BAT and AVIONICS MASTER PWR switches to ON.