Garmin GI 275 Installation Manual page 252

5.7.2.4 Honeywell (Bendix/King) KFC 225 Autopilot
NOTE
The following procedure is only required if the GI 275 is used to provide analog attitude to
the autopilot.
NOTE
The Honeywell KFC 225 Flight Control System Installation and Maintenance Manual
specific to the aircraft being modified must be used whenever making flight director
adjustments.
The autopilot interface must be configured for a KFC 225. A voltmeter, accurate to 1 mV at a 5 VDC
range, is required for the procedure.
Complete the following procedure:
1. Power on the GI 275 the Configuration mode.
2. Navigate to the Gyro Output Test page (Calibration/Test → Autopilot → Gyro Output Test).
3. Perform the Attitude Gyro Calibration Procedure using KI 256 gyro emulation.
a. Use an extender harness for the KC 225 to gain access to the PIT/ROL adjustment
potentiometers on the side of the KC 225 as specified in Honeywell KFC 225 Flight Control
System Installation Manual.
b. Touch the Set Installation Offsets page on the KC 225 Remote Terminal Interface (RTI).
c. Refer to Honeywell KFC 225 Flight Control System Installation Manual for instructions
regarding how to connect and use the KC 225 RTI.
d. Verify that the internal AHRS test values are 0° UP for pitch, 0° RT for roll, and are valid
(i.e., Attitude Valid button is illuminated green).
e. Record the values for Pitch and Roll attitude that are displayed on the KC 225 RTI. These are
the Pitch/Roll Offset values.
f. Set the internal AHRS Output to 10° UP using the up PITCH arrow.
g. Adjust the PIT potentiometer on the side of the KC 225 until the Pitch value on the KC 225
RTI is equal to 10° plus the Pitch Offset value (tolerance ±0.5°). Refer to the example pitch
adjustment shown below.
h. Set the internal AHRS Output to 0° UP using the down PITCH arrow.
i. Set the internal AHRS Output to 20° RT using the right ROLL arrow.
j. Adjust the ROL potentiometer on the side of the KC 225 until the Roll value on the KC 225
RTI is equal to 20° plus the Roll Offset value (tolerance ±0.5°). Refer to the example roll
adjustment shown below.
k. Set the internal AHRS Output to 0° RT using the left ROLL arrow.
l. Engage the autopilot in the default modes (PIT and ROL).
m. On the KC 225 RTI, touch 3. Pitch Attitude.
n. To store the pitch attitude calibration, touch ENTER.
o. With the autopilot still engaged in the default modes, adjust the potentiometer on the front of
the KC 225 until the Roll value on the KC 225 RTI is equal to 0°.
190-02246-10
Rev. 11
Pitch Offset Roll Offset
GI 275 Part 23 AML STC Installation Manual
Page 5-74