GPS 155Xl/GNC 300XL Installation Manual
P/N 190-00067-22 Rev E Page 4-5
Identification Data:
Label
(octal)
Description
377
Equipment identifier
371*
General Aviation equipment identifier
*These labels are formatted per the General Aviation Manufacturers Association (GAMA) definition. Note that the
use of a 429-device w/o GAMA will cause the loss of the above asterisked labels. Some may be required for A1
certification. For example, label 326 changes the CDI scale for approach.
4.3.4
CDI Calibration
Select the test page displaying CDI output calibration. Place the cursor on the alignment field by using the large
knob. Use the small knob to adjust the CDI needle until it is centered. Once centered, turn the cursor off to complete
the calibration process.
4.3.5
Selected Course Calibration
Select the test page displaying the selected course input. Using an extremely accurate input source, input 150
°
to the
GPS 155XL/GNC 300XL. The input course will indicate close to 150 and a "Calib?" field will appear in the lower
right corner. Selecting the "Calib?" field will calibrate the GPS 155XL/GNC 300XL to match the input source.
Verify OBS operation by checking that the bearing displayed on the GPS 155XL/GNC 300XL is within 2
°
of the
selected bearing. Do this for every multiple of 30
°
around the OBS.
4.3.6
Approach Settings
Select the Approach Settings Test Page. Move the cursor over the approach switch field to change the installation
state. The available options are:
Appr switch: Field
Description
none
The approach switch is not present
instld
The approach switch is installed
NOTE:
To verify the installation of the approach switch, the "instld" setting requires the approach
switch to be pressed to confirm its presence. The following prompt is displayed in this case:
"press appr switch to confirm" along with a “?” following "instld". When the switch press is
recognized, the prompts are cleared and the "instld" setting is confirmed.
