82011-ICUG Rev G
SG102 AHRS Installation/Calibration Utility
12
8 Calibration
8.1
Notes on Aircraft Configuration
All calibration steps are performed in the aircraft with the engine power and
electrical loads as indicated below to ensure the magnetic environment during
compass rose calibration matches as closely as possible the magnetic environment
during flight.
1)
Ensure that the SG102 AHRS Maintenance Adaptor (PN 82132) is securely
attached to the SG102.
2)
Battery Master switch should be ON.
3)
Engine(s) should be running (see step 8).
4)
For Helicopters, rotor must be engaged and spinning (for those with a rotor
clutch).
5)
Avionics master switch ON.
6)
All available avionics equipment ON. In addition, rotating beacon and strobe
lights should be ON.
7)
Typical engine operation. The purpose is to ensure that test conditions are similar
to flight conditions.
Jet Engines at idle.
Turbine aircraft at 60%.
Piston aircraft at 1800 RPM.
Rotor Speed no less than 30%-40%
8.2
Taxi to the Compass Rose
Proceed to a calibrated Compass Rose or compass calibration location at least 100 feet
from large metal objects such as: fuel trucks, aircraft tugs, metal buildings, high power
lines and transformers and underground fuel tanks. A calibrated, handheld sight
compass is strongly recommended for this procedure. It is essential to align the aircraft
precisely at each calibration point.
8.3 Perform
Calibration
8.3.1
Re-establish PC Communications
Start up the PC and the Installation Utility. Communications with the SG102 should re-
establish. When this occurs the MT102 Free Field measurement previously recorded
will be retrieved and the Calibrate button will proceed to the Mount Direction screen.
