190-02081-03
GFC 600H HFCS Part 27 STC Maintenance Manual
Rev. 3
Page 7-10
Table 7-2 Post-Installation Calibrations
Notes:
[1] If it is determined that a Heading Offset Calibration should be performed, a Heading
Accuracy Check (i.e., Compass Swing Test) must be performed in accordance with
Section 7.7.4 prior to the Heading Offset Calibration.
Condition
GMC 605H
Pitch/Roll
Calibration
GRS 79H or
GSU 75H
Pitch/Roll
Calibration
Magnetic
Interference
Test
GMC 605H &
GRS 79H or
GSU 75H
Magnetometer
Calibration
GRS 79H or
GSU 75H /
GMU 44( )
Heading
Offset
Calibration
[1]
GMC 605H was
removed (original unit)
and the mounting rack
was
NOT
removed
and/or loosened.
No
GMC 605H was
removed (original unit)
and the mounting rack
WAS
removed and/or
loosened.
Yes
No
No
Yes
Yes
GMC 605H was
replaced (new unit),
repaired, or exchanged.
Yes
Yes
Yes
Yes
Yes
GMC 605H
configuration module
was replaced.
Yes
No
No
Yes
Yes
GMU 44( ) was removed
(original unit) and/or
replaced (new unit), or
the area near the
GMU 44 location was
degaussed.
No
No
Yes
Yes
Yes
GRS 79H or GSU 75H
was removed (original
unit) and the mounting
rack was
NOT
removed
and/or loosened.
No
GRS 79H or GSU 75H
was removed (original
unit) and the mounting
rack
WAS
removed and/
or loosened.
No
Yes
No
Yes
Yes
GRS 79H or GSU 75H
was replaced (new unit),
repaired, or exchanged.
No
Yes
No
Yes
Yes
GRS 79H or GSU 75H
configuration module
was replaced.
No
Yes
Yes
Yes
Yes