Performance Information; Maintenance - Garmin G3X Installation Manual

10.7 Performance Information

The GSU 25 is capable of maneuvers through a range of 360° in bank and pitch. The rotation rate
capability is ±500° per second.
Pitch/roll accuracy is +/- 2 degrees, heading accuracy is 3 degrees in straight and level flight.
Pitch/roll accuracy is 3.5 degrees and heading accuracy is +/-5 degrees under normal dynamic
maneuvering (bank < 35°, pitch <15°).
Due to unsuitability of the magnetic fields near the Earth's poles, operational accuracy is unknown in the
following regions:
1. North of 72° North latitude at all longitudes
2. South of 70° South latitude at all longitudes
3. North of 65° North latitude between longitude 75° W and 120° W (Northern Canada)
4. North of 70° North latitude between longitude 70° W and 128° W (Northern Canada)
5. North of 70° North latitude between longitude 85° E and 114° E (Northern Russia)
6. South of 55° South latitude between longitude 120° E and 165° E (Region South of Australia and
New Zealand)

10.8 Maintenance

Per Part 43 Appendix E, paragraph (b)(2), Garmin specifies a test procedure equivalent to part 43
Appendix E, paragraph (b)(1) with two exceptions. The tests of sub-paragraph (iv)(Friction) and (vi)
(Barometric Scale Error) are not applicable because the digital outputs of the GSU 25 are not susceptible to
these types of errors.
The GSU 25 utilizes an Earth magnetic field model which is updated once every five years. This IGRF
(International Geomagnetic Reference Field) update is expected to be available from Garmin by July 1 of
2015 and every five years thereafter, so long as the GSU 25 remains a Garmin –supported product. The
IGRF model is automatically updated with a GDU 37X software update. Otherwise maintenance of the
GSU 25 is 'on condition' only.
NOTE
If the GSU 25 is moved or replaced, the Post Installation Calibration Procedures
(Section 19.3) must be repeated.
G3X Installation Manual - GSU 25 Installation
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