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5-4

Garmin GNC 255A/255B Pilot’s Guide

190-01182-01 Rev. E

Troubleshooting

NOTE

The GNC 255’s system ID is required when downloading the frequency database.
See section 3.5.8 for details on the system ID.

COOLING FAN -

The cooling fan has

failed.

The GNC cooling fan is

powered, but it is not
turning at the desired
RPM.

Decrease cabin

temperature and increase
cabin airflow (especially
near the GNC) to prevent
damage to the unit.
Contact dealer for service.

DISPLAY -

Display board needs

service.

The display board is

indicating that it needs
service.

Contact dealer for service.

FEATURE UNLOCK

FAILURE -

The database on the USB

flash drive is corrupt or
the system ID in the
database does not match
the unit’s system ID.

Verify that the correct

system ID is entered into
flyGarmin.com when
downloading the database.
Contact Garmin Customer
Support if this message
persists.

GLIDESLOPE -

Glideslope receiver

needs service.

The glideslope board is

indicating that it needs
service. The glideslope
board may continue to
function.

Verify glideslope deviation

indications with another
source and crosscheck final
approach fix crossing
altitude. If another
glideslope source is not
available for verification, fly
a GPS based approach.
Contact dealer for service.

GLIDESLOPE -

Glideslope receiver has

failed.

The glideslope board is

not communicating
property with the system.

Fly an approach that does

not use the glideslope
receiver (VOR, LOC, GPS).
Contact dealer for service.

NO UNLOCK FILE -

The USB flash drive is

missing the feature
unlock file for the
frequency database.

Verify the correct system ID

is entered on
flyGarmin.com and the
frequency database is
downloaded onto the USB
flash drive. Contact
Garmin Customer Support
if this message persists.

MESSAGE

DESCRIPTION

ACTION

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Содержание GNC 255A

Страница 1: ...GNC 255A 255B Pilot s Guide ...

Страница 2: ... electronic or printed copy of this manual or revision must contain the complete text of this copyright notice and provided further that any unauthorized commercial distribution of this manual or any revision hereto is strictly prohibited Garmin is a registered trademarks of Garmin Ltd or its subsidiaries These trademarks may not be used without the express permission of Garmin SOFTWARE VERSION Th...

Страница 3: ...AS SAFE FOR ANTI REFLECTIVE COATINGS NOTE Do not use outdated database information Databases used in the system must be updated regularly in order to ensure that the information remains current Pilots using an outdated database do so entirely at their own risk NOTE Garmin recommends that if flying in a region with 8 33 kHz COM channel spacing the radio should remain in 8 33 kHz mode This will prev...

Страница 4: ... frequency energy and if not installed and used in accordance with the instructions may cause harmful interference to radio communications Furthermore there is no guarantee that interference will not occur in a particular installation If this equipment causes harmful interference the user is encouraged to try to correct the interference by relocating the equipment or connecting the equipment to a ...

Страница 5: ... fly garmin com fly garmin Look for the Product Registration link on the Home page Also be sure to record your serial number in the space provided For aviation product support visit flyGarmin com Record of Revision PART NUMBER REVISION DATE CHANGE DESCRIPTION 190 01182 01 A 11 19 12 Initial Release B 03 30 15 Added v2 10 functionality C 04 07 15 Corrected Part Number on back cover D 10 05 20 Added...

Страница 6: ...iv Garmin GNC 255A 255B Pilot s Guide 190 01182 01 Rev E INTENTIONALLY LEFT BLANK ...

Страница 7: ...unctions 3 1 3 2 COM Frequencies 3 2 3 2 1 Recent COM Frequencies 3 2 3 2 2 COM User Frequencies 3 2 3 2 3 COM Database Frequencies 3 5 3 2 4 COM Nearest Airports APT 3 6 3 2 5 COM Nearest Area Control Center ACC Frequencies 3 6 3 2 6 COM Nearest Flight Service Station FSS Frequencies 3 7 3 2 7 COM Nearest Weather WX Frequencies 3 7 3 3 NAV Frequencies 3 8 3 3 1 Recent NAV Frequencies 3 8 3 3 2 NA...

Страница 8: ... 21 3 6 1 Setting Up the Count Down Timer 3 21 3 6 2 Setting Up the Count Up Timer 3 21 3 6 3 Viewing Timers in the COM Display 3 22 4 DATABASE INFORMATION 4 1 4 1 Downloading the Frequency Database 4 1 4 2 Updating the GNC 255 Frequency Database 4 1 5 TROUBLESHOOTING 5 1 5 1 Messages 5 3 ...

Страница 9: ...frequencies The GNC 255 s COM radio operates in the aviation voice band from 118 000 to 136 975 MHz in 25 kHz steps default For European operations configuration for 8 33 kHz steps is provided with the GNC 255A 10 watt and GNC 255B 16 watt The GNC 255 VHF NAV receiver operates from 108 MHz to 117 95 MHz decoding both the VHF Omni Range and Localizer navigation signals The built in Glideslope recei...

Страница 10: ...wer COM Volume Squelch knob to toggle automatic squelch control On Off for the COM radio COM Volume and Squelch Display The COM radio has an automatic squelch to reject many localized noise sources You may override the squelch function by pressing the Power COM Volume Squelch knob This facilitates listening to a distant station or setting the desired volume level To override the automatic squelch ...

Страница 11: ...e current OBS setting and graphic CDI press the OBS key The OBS page will be disabled if the unit is installed with an external converter To toggle between the bearing TO or radial FROM the active VOR press the T F key The T F page also shows Distance Speed Time information The T F key does not operate for Localizer frequencies To erase information cancel entries and reset timers press the CLR key...

Страница 12: ...182 01 Rev E Getting Started 1 3 USB Port The USB port is used to update the frequency database in the GNC 255 NOTE For updating the databases Garmin recommends the use of a USB 2 0 compatible flash drive The flash drive must be formatted as FAT32 ...

Страница 13: ...increments The MHz selection range is between 118 and 136 in one MHz steps 3 Turn the inner knob to change the values in 25 kHz or 8 33 kHz increments The kHz selection range is between 000 and 975 kHz in 25 kHz steps or 000 and 990 kHz in 8 33 kHz steps 4 Turn the outer and inner knobs clockwise to increase and counterclockwise to decrease the frequency values Standby frequency selection is not i...

Страница 14: ...eled by switching to NAV mode 2 1 3 Saving a COM Channel The current standby frequency may be saved into the COM User Frequency database from the COM display or the COM User Function The COM User Frequency database can hold up to fifteen frequencies NOTE When switching from 8 33 kHz to 25 kHz mode any 8 33 kHz specific user frequencies will be deleted from the user frequency list This only affects...

Страница 15: ...SCRIPTION TWR Tower GND Ground ATIS Automatic Terminal Information Service AWS Automated Weather Observing System ATF Aerodrome Traffic Frequency ARR Arrival APPR Approach DEP Departure CLR Clearance CTAF Common Traffic Advisory Frequency FSS Flight Service Station RFS Remote Flight Service Station MF Mandatory Frequency UNI Unicom Blank None Waypoint Type ...

Страница 16: ... the inner knob to scroll through the list of frequency types Waypoint types with a sign will have more frequencies for the same type After selection the selected waypoint and type will be stored for 30 minutes Database Waypoint Type Selection 5 Press ENT to copy the frequency into the standby frequency location 6 The nearest station identifier will show for the selected frequency if connected to ...

Страница 17: ...M TRANSFER KEY TO EXIT NOTE Under some circumstances if the COM system loses communication with the main system the radio will automatically tune to 121 50 MHz for transmit and receive regardless of the displayed frequency 2 1 6 Stuck Mic The GNC 255 helps protect you from a situation where the microphone may get stuck in the ON or Transmit position If the microphone is keyed for longer than 35 se...

Страница 18: ...pressed Remote Frequency Selection only functions on units configured for a remote COM Frequency recall switch 2 2 NAV Radio 2 2 1 Selecting a NAV Frequency The selection of NAV frequencies is the same as for the COM frequencies 1 Press the C N key to reach the NAV radio function The NAV annunciator on the top line of the display will show 2 Turn the outer knob to change the MHz values The MHz sel...

Страница 19: ...ers 3 Turn the outer knob to move the cursor NAV User Frequency Name Selection 4 After selecting characters press ENT 5 Turn the outer knob to select the waypoint type 6 Turn the inner knob to select the type from the list NAV User Frequency Type Selection 7 Press ENT to save displayed values Press CLR to cancel the changes NAV Frequency Type List FREQUENCY TYPE SYMBOL DESCRIPTION VOR Very High Fr...

Страница 20: ...e OBS Mode If the system is configured with an analog or digital external CDI HSI the OBS radial of the remote display will be decoded and displayed on the screen of the GNC 255 Press the OBS key to see the current OBS setting and graphic CDI NOTE The Identifier is the decoded NAV identifier from the Morse code broadcast by the station If the system is configured with a composite external indicato...

Страница 21: ...press the T F key to show DST data in the lower part of the display DST Data Display NOTE The If both GPS and DME data sources are connected to the GNC and dashes are displayed when distance speed time data is expected to be displayed press the T F key to prompt the GNC to display DST data NOTE DST information will only be displayed for stations that are within 200 NM Active NAV Frequency Time To ...

Страница 22: ...2 10 Garmin GNC 255A 255B Pilot s Guide 190 01182 01 Rev E INTENTIONALLY LEFT BLANK ...

Страница 23: ...reqs Database Nearest Apt Nearest ACC Nearest FSS COM Frequency List Nearest WX Adjust Intrcom Aux Audio Intrcom On Off Speaker On Off ICS Configuration COM Spacing COM Sidetone DSPL Brt DSPL Contrast SYS Configuration Database Info Load Database Software Ver Serial Number Count Up ENT Start Stop CLR Reset ENT Start Stop TMR Configuration CLR Reset Push CRSR Settings ENT Accept Count Down Recent F...

Страница 24: ...eted from the user frequency list This only affects the user frequencies within the 8 33 kHz spectrum Recent COM Frequencies 1 Press FUNC 2 Turn the inner knob to RECENT FREQS 3 Press ENT 4 Turn the inner knob to select an entry 1 20 5 Press FLIP FLOP to set the selected frequency as the active frequency Press ENT to set the selected frequency as the standby frequency 3 2 2 COM User Frequencies Fi...

Страница 25: ...LOP to set the selected frequency as the active frequency Press ENT to set the selected frequency as the standby frequency Deleting a COM User Frequency Deleting User COM Frequencies 1 Press FUNC 2 Turn the inner knob to USER FREQS 3 Press ENT 4 Turn the inner knob to cycle through COM user frequencies 5 Press CLR to delete the selected user frequency 6 Press ENT to confirm deleting the selection ...

Страница 26: ... select the MHz values 7 Turn the outer knob to select the kHz field 8 Turn the inner knob to select the kHz values 9 Turn the outer knob to select the WPT field 10 Turn the inner knob to select characters and turn the outer knob to move the cursor COM User Frequency Name Selection 11 Press ENT 12 Turn the outer knob to select the TYPE field 13 Turn the inner knob to select the frequency type COM ...

Страница 27: ...ter knob to move the cursor to highlight a character 6 Press ENT 7 If the frequency type is available turn the inner knob to select the frequency type 8 Press FLIP FLOP to set the selected frequency as the active frequency Press ENT to set the selected frequency as the standby frequency NOTE The nearest station identifier for the selected frequency will be shown below the active or standby frequen...

Страница 28: ...quency Press CLR to return to the functions display 3 2 5 COM Nearest Area Control Center ACC Frequencies When interfaced with a GPS receiver the GNC 255 will report the twenty five nearest Area Control Center ACC frequencies ACCs are also known as Air Route Traffic Control Centers ARTCC COM Nearest Area Control Center Frequencies 1 Press FUNC 2 Turn the inner knob to NEAREST ACC 3 Press ENT 4 Tur...

Страница 29: ...cy as the active frequency Press ENT to set the selected frequency as the standby frequency Press CLR to return to the functions display 3 2 7 COM Nearest Weather WX Frequencies When interfaced with a GPS receiver the GNC 255 will report the twenty five nearest weather WX frequencies COM Nearest Weather Frequencies 1 Press FUNC 2 Turn the inner knob to NEAREST WX 3 Press ENT 4 Turn the inner knob ...

Страница 30: ...recent NAV frequencies 1 Press FUNC 2 Turn the outer knob to NAV FREQUENCY LIST 3 Turn the inner knob to RECENT FREQS 4 Press ENT Recent NAV Frequencies 5 Turn the inner knob to select an entry 1 20 6 Press FLIP FLOP to set the selected frequency as the active frequency Press ENT to set the displayed frequency as the standby frequency 3 3 2 NAV User Frequencies Fifteen NAV user frequencies can be ...

Страница 31: ...et the selected frequency as the active frequency Press ENT to set the displayed frequency as the standby frequency Deleting a NAV User Frequency Deleting User NAV Frequencies 1 Press FUNC 2 Turn the outer knob to NAV FREQUENCY LIST 3 Turn the inner knob to USER FREQS 4 Press ENT 5 Turn the inner knob to cycle through NAV user frequencies 6 Press the CLR key to delete the selected user frequency 7...

Страница 32: ...ner knob to start editing NAV user frequency 7 Turn the inner knob to select the MHz values 8 Turn the outer knob to select the kHz field 9 Turn the inner knob to select the kHz values 10 Turn the outer knob to select the WPT field 11 Turn the inner knob to select characters and turn the outer knob to move the cursor 12 Press ENT 13 Turn the outer knob to select the TYPE field 14 Turn the inner kn...

Страница 33: ...n the inner knob to DATABASE 4 Press ENT 5 Turn the inner knob to select the character 6 Turn the outer knob to move the cursor to highlight a character 7 Press ENT 8 If the frequency type is available turn the inner knob to select the frequency type 9 Press FLIP FLOP to set the selected frequency as the active frequency Press ENT to set the selected frequency as the standby frequency Selected NAV...

Страница 34: ...frequency as the standby frequency Set Selected Frequency as Active or Standby 3 3 4 NAV Nearest VOR When interfaced with a GPS receiver the GNC 255 will report the twenty five nearest VORs NAV Nearest VOR Frequencies 1 Press FUNC 2 Turn the outer knob to NAV FREQUENCY LIST 3 Turn the inner knob to NEAREST VOR 4 Press ENT 5 Turn the inner knob to display the available VORs 6 Press ENT to set the d...

Страница 35: ...h is set to auto the squelch sensitivity adjusts automatically When squelch is set to 0 squelch is usually open When squelch is set to 100 squelch is usually closed ICS auto squelch is available with software v2 10 or later Adjust Intercom Settings 1 Press FUNC 2 Turn the outer knob to ICS CONFIGURATION 3 Turn the inner knob to ADJUST INTRCOM 4 Press ENT 5 Turn the inner knob to set the ICS squelc...

Страница 36: ... v2 10 or later 9 Turn the inner knob to ON or OFF To mute the AUX audio when a radio transmission is received select ON 10 Press ENT to save new values Press CLR to cancel the changes 3 4 3 Intercom On Off The Intercom On Off function toggles the intercom on and off If installed with a remote switch the intercom can also be remotely toggled on or off The Intercom On Off function must be set to ON...

Страница 37: ...nction toggles the speaker output on and off Speaker On Off 1 Press FUNC 2 Turn the outer knob to ICS CONFIGURATION 3 Turn the inner knob to SPEAKER ON OFF 4 Press ENT 5 Turn the inner knob to set the speaker output ON or OFF 6 Press ENT to save the selected value Press CLR to cancel the change Speaker On or Off ...

Страница 38: ... 5 1 COM Spacing COM spacing may be selected between 8 33 kHz and 25 kHz to allow for regional requirements NOTE When switching from 8 33 kHz to 25 kHz mode any 8 33 kHz specific user frequencies will be deleted from the user frequency list This only affects the user frequencies within the 8 33 kHz spectrum COM Spacing 1 Press FUNC 2 Turn the outer knob to SYS CONFIGURATION 3 Turn the inner knob t...

Страница 39: ... lowest to 10 highest with 0 as the default NOTE COM Sidetone Pilot Control must be enabled by the installer COM Sidetone Page 1 Press FUNC 2 Turn the outer knob to SYS CONFIGURATION 3 Turn the inner knob to COM SIDETONE 4 Press ENT 5 Turn the inner knob to set mode of COM sidetone OFFSET COM sidetone volume changes with adjustments of the COM volume knob FIXED COM sidetone volume is at level set ...

Страница 40: ...C 255 will either control dimming based on the photocell or the lighting bus This is set in configuration mode during installation and is not selectable by the pilot Display Brightness Page 1 Press FUNC 2 Turn the outer knob to SYS CONFIGURATION 3 Turn the inner knob to DSPL BRT 4 Press ENT 5 Turn the inner knob to set the value 6 Press ENT to save selected value Press CLR to cancel change 3 5 4 D...

Страница 41: ... a USB port to allow for easily updating the system databases NOTE Garmin recommends the use of a USB 2 0 compatible USB flash drive formatted as FAT32 for updating the database 1 Insert the supplied cable into the USB port of the GNC 255 2 Insert the USB flash drive into the other end of the cable 3 Press FUNC 4 Turn the outer knob to SYS CONFIGURATION 5 Turn the inner knob to LOAD DATABASE 6 Pre...

Страница 42: ...ATION 3 Turn the inner knob to SOFTWARE VER 4 Press ENT 5 Press FUNC to return to the main menu 3 5 8 Serial Number NOTE The ID consists of a combination of numbers 0 9 and letters A F The number 8 and the letter B are distinguishable as depicted in the Serial Number screenshot Serial Number Page 1 Press FUNC 2 Turn the outer knob to SYS CONFIGURATION 3 Turn the inner knob to SERIAL NUMBER 4 Press...

Страница 43: ...er knob to enter a starting timer value 6 Turn the outer knob to move to set seconds minutes or hours 7 Press ENT to confirm entry 8 Press ENT to start or stop the timer 9 Press the CLR key to reset the timer to the starting value 10 Press the inner knob to change the starting timer value 3 6 2 Setting Up the Count Up Timer Count Up Timer Page 1 Press FUNC 2 Turn the outer knob to TMR CONFIGURATIO...

Страница 44: ... timer will then be shown until the count down timer is restarted Timer Value Shown in the COM Display Clearing and Stopping Displayed Timers Clearing and Stopping Timers 1 To reset the timer press CLR and then ENT 2 To stop the displayed timer press ENT twice When the count down timer reaches 0 00 it will continue counting as a count up timer The count down timer which is counting up will be high...

Страница 45: ...nsfer the database into the unit The following equipment is required to perform the update Windows compatible PC computer Windows 2000 XP Vista or Windows 7 recommended USB 2 0 compatible USB flash drive formatted as FAT32 External USB cable Updated database obtained from the Garmin website 4 1 Downloading the Frequency Database NOTE The GNC 255 s system ID is required when downloading the frequen...

Страница 46: ...4 2 Garmin GNC 255A 255B Pilot s Guide 190 01182 01 Rev E INTENTIONALLY LEFT BLANK ...

Страница 47: ... contact your dealer or the factory for technical assistance Please have the following information ready System configuration products antennas mounting locations etc Model number part number and serial number Software versions Description of the problem Efforts made to isolate solve the problem For aviation product support visit flyGarmin com ...

Страница 48: ...unction It can be enabled or disabled via a remote mounted switch or via the menu Check connections No voice activation or if must talk too loud Check ICS page Intercom On Off Adjust Intercom Unable to change active frequency COM Radio not communicating The radio may also be in lockout mode In this case the radio would be tuned to 121 50 and the active freq would not be able to be changed If in Lo...

Страница 49: ... properly with the system Press and hold the volume knob or the external COM remote transfer COM RMT XFR switch if installed this will force the COM radio to 121 5 MHz Contact dealer for service COM RADIO COM overtemp or undervoltage Reducing transmitter power COM radio is in overtemp or undervoltage mode and transmitting power has been reduced to prevent damage to the COM radio Radio range will b...

Страница 50: ...hen downloading the database Contact Garmin Customer Support if this message persists GLIDESLOPE Glideslope receiver needs service The glideslope board is indicating that it needs service The glideslope board may continue to function Verify glideslope deviation indications with another source and crosscheck final approach fix crossing altitude If another glideslope source is not available for veri...

Страница 51: ...econds This input will now be ignored This input is not available in all installations Verify the COM RMT XFR key switch is not stuck Contact dealer for service if this message persists REMOTE KEY STUCK COM remote frequency increment key is stuck The remote COM frequency increment COM CHAN UP key switch has been in pressed position for at least 30 seconds This input will now be ignored This input ...

Страница 52: ...nput is not available in all installations Verify the NAV RMT XFR key or switch is not stuck Contact dealer for service if this message persists VLOC RECEIVER Navigation receiver needs service The NAV radio is reporting that it needs service The NAV radio may continue to function Contact dealer for service VLOC RECEIVER Navigation receiver has failed The NAV radio is not communicating property wit...

Страница 53: ......

Страница 54: ...190 01182 01 Rev E ...

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