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5 POST INSTALLATION, CONFIGURATION, AND CHECKOUT
PROCEDURE
CAUTION
Be sure to check all aircraft control movements before flight is attempted to insure
that the wiring harness does not touch any moving part.
NOTE
The following procedures reflect a Garmin Integrated Flight Deck installation.
5.1 Function Selector Switches and Display
There are no operating controls or displays on the GSU 75.
5.2 Post-Installation Calibration Procedures
After mechanical and electrical installation of the GSU 75 AHRS and GMU 44 magnetometer have been
completed, prior to operation, a set of post-installation calibration procedures must be carried out.
Table 5-1 describes the necessary calibration procedures:
Table 5-1 Post-Installation Calibration Procedure Summary
Calibration
Procedure Name
Procedure
A-1
A-2
Offsets by Manual
B
C
D
190-01639-00
Rev. 6
The document reference is online, please check the correspondence between the online documentation and the printed version.
Description
Pitch/Roll Offset
Level Aircraft
Compensation
Manually enter
Zero Pitch/Roll
zeros for pitch/roll
offsets (pass-code
Entry
Magnetometer
Compass Rose
Calibration
Taxi Maneuver
Compass Rose
Heading Offset
Alignment with
Compensation
Magnetic North
Validate vibration
Engine Run-Up
characteristics of
Vibration Test
Procedure
Installations Requiring Procedure
Either procedure A-1 or A-2 is required
for all installations. Procedure A-1 is
recommended.
This procedure should be used only if
leveling the aircraft is not feasible and
the AHRS is mounted to within 0.25° of
required)
aircraft level reference
All installations
This procedure should be repeated
following a removal or replacement of
the GMU 44 unit, or degaussing of the
area near the GMU 44 location.
Strongly recommended in installations
in which GMU 44 alignment is not
within 0.5° of aircraft forward
longitudinal direction
All installations
installation
GSU 75 ADAHRS Installation Manual
Page 5-1
340095
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