GNC 255A/255B
November
Limited Warranty
190-01182-01 Rev. a
Iii
Operation
Product Registration and Support
US Toll Free Canada Toll Free
Record of Revisions
Contents
2.2
2.1
2.3
Index Index-1
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Getting Started
Product Description
Nav Volume/ID Knob
Power/Com Volume/Squelch Knob
Pilot Controls
5 C/N Com/Nav Key
Tuning LARGE/SMALL Concentric Cursor Knobs
FLIP/FLOP Key
OBS Key
Func Function Key
USB Port
MON Monitor Key
Com Radio
Power On
Selecting a Com Frequency
Saving a Com Channel
Monitoring the Standby Com Channel
After selecting the desired characters, press ENT
Description
After making a selection, press ENT
Com Database Look-Up
Frequency Database Reverse Look-Up
Stuck Mic
Emergency Channel
Remote Frequency Selection Control
Selecting a Nav Frequency
Nav Radio
Saving a Nav Channel
Listening to the Nav Audio Channel
01-36
OBS Mode
14 CDI Display
Distance/Speed/Time DST Display
15 DST Data Display
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Functions
Functions Description
Recent Com Frequencies
Com Frequencies
Turn the Small knob to select an Entry
Com User Frequencies
Press the CLR key to delete this User frequency
Editing a Com User Frequency
Frequencies. Press ENT
Com Database Frequencies
Com Database Frequencies
Com Nearest Airports APT
Nearest APT function. Then, press ENT
Com Nearest Area Control Center ACC Frequencies
Turn Small Knob To Scroll Through Available Frequencies
Com Nearest Flight Service Station FSS Frequencies
13 Com Nearest FSS Frequencies
Com Nearest Weather WX Frequencies
14 Com Nearest Weather Frequencies
Nav Frequencies
Recent Nav Frequencies
Nav User Frequencies
Press the ENT key to delete the displayed frequency
Editing a Nav User Frequency
Nav Database Frequencies
21 Nav Database Frequencies
When duplicate identifiers are found, press ENT
Nav Nearest VOR
Turn the Small knob to display the available VORs
ICS Configuration
Adjust Intercom
Functions display
Aux Audio
Turn the Small knob to turn the Aux Audio On or Off
Intercom On/Off function. Then, press the ENT key
Intercom On/Off
Speaker On/Off
Speaker On/Off function. Then, press ENT
System Configuration
Com Spacing
Display Brightness
34 Set Display Brightness
Display Contrast function. Then, press the ENT key
Display Contrast
Database Info
Database Version function. Then, press the ENT key
Load Database
Load Database function. Then, press the ENT key
Software Version function. Then, press the ENT key
Software Version
Serial Number
Press the Func key to return to the main menu
Setting Up the Count Down Timer
Timers
To select a starting timer value
Pressing CLR and then ENT will reset the displayed Timer
Setting Up the Count Up Timer
Viewing Timers in the Com Display
Pressing ENT twice will stop the displayed Timer
48 Count Down Timer Value Now Counting Up
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Troubleshooting
Appendix
If in Lock Out mode
It can be enabled
Or disabled via a Remote mounted
Calibration error Recalibrate resolver
Updating the Frequency Database
Messages
Verify glideslope deviation
Power has been Re-apply power to the unit
Switch has been
Property with
Remote com
All installations
Installations
Been in pressed
Not communicating
Nav radio is Contact dealer for service
Property with System
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Index
Remote frequency control 2-5 Reverse look-up 2-4 Revisions