To Next PageTo Next PageWhat does 'COOLING - GTN overtemp' mean on my Garmin GPS?
The 'COOLING - GTN overtemp' message on your Garmin GPS indicates that the unit has detected excessive display backlight temperature. The backlight has been automatically dimmed to reduce the unit temperature. Check for adequate ventilation or cooling airflow, and ensure the cooling fan is operating and unobstructed.
What to do if my Garmin GPS signal levels are very low?
If your Garmin GPS signal levels are very low, consider the following: * Check the GPS antenna installation, connections, and cable routing. The GPS antenna must be mounted on top of the rotorcraft. * Ensure the rotorcraft is clear of obstructions like hangars, buildings, and trees. * Address potential RF interference at 1575.42 MHz from VHF COM by adding a 1575.42 MHz notch filter in the COM coaxial, fixing or replacing the COM, disconnecting the ELT antenna coaxial to check for possible re-radiation, or moving the GPS antenna further from the COM antenna.
Why Garmin GPS does not compute a position?
If your Garmin GPS unit is not computing a position, it might not be receiving adequate GPS signals. Check the GPS antenna connections and ensure the rotorcraft is clear of hangars, buildings, trees, etc. Alternatively, wait 20 minutes for the GTN to download the full GPS almanac and acquire its position.
What to do if Garmin GPS signal drops when avionics are on?
If GPS signal levels drop when avionics are turned on, it is likely due to noise interference from other avionics. To resolve this, turn off all avionics, then turn them on one at a time to isolate the source of the interference. Also, route the GPS cable and locate the GPS antenna away from potential sources of interference.
What to do if Garmin OBS Resolver won’t calibrate?
If the OBS Resolver on your Garmin device won’t calibrate, it may be due to an incompatible resolver or an improper connection. Check the resolver specifications and wiring.
What to do if my RS-232 device is not communicating with the Garmin GTN?
If an RS-232 device is not communicating with your Garmin GTN, there are several potential causes. First, check the RS-232 port setting for the port that the device is connected to. Second, verify the configuration of the other device. Third, ensure the GTN RX is connected to the remote device TX and GTN TX is connected to the remote device RX. Also, verify that there is only one TX source per RX port. Check the wiring. Finally, ensure the correct baud rate and parity settings are selected in Config Mode.
What to do if Garmin key is stuck?
If the bezel’s Home key is stuck in the enabled or pressed state, press the Home key again to cycle its operation. If the message persists, contact Garmin Product Support.
Why is my Garmin side tone level too low or too high?
If the side tone level on your Garmin device is too low or too high, it could be due to the wrong type of headsets or the side tone level needing adjustment. If necessary, adjust the side tone level on the COM Setup Config Mode page.
Why is my Garmin GTN booting into Configuration mode?
If your Garmin GTN is booting into Configuration mode instead of Normal mode, it's likely because the Software Loader Card is inserted in the SD card slot. Remove the Software Loader Card and insert the database card. If this doesn't solve the issue, reload the software into the GTN and ensure it powers up in normal mode afterward.
How to fix Garmin GPS when demo mode is active?
If your Garmin GPS is stuck in Demo Mode, which means it should not be used for navigation, check that the DEMO MODE SELECT* input (P1002-1) is not tied to ground and also make sure that the Direct-To key is not stuck.
General| Touchscreen | Yes |
|---|---|
| COM Transceiver | Yes |
| NAV Receiver | Yes |
| Operating Temperature | +55°C |
| Storage Temperature | +70°C |
| Certification | TSO-C113a |
| Interfaces | RS-232, ARINC 429 |
| Navigation Capabilities | VOR, ILS |
| Database Support | Jeppesen |
Refers to pilot guides and maintenance manual for operation and testing.
Outlines maintenance intervals and checks for GTN and GMA 35.
Refers to maintenance manual for troubleshooting GTN/GMA 35 errors.
Refers to maintenance manual for equipment removal and replacement.
Outlines antenna inspection after lightning strike.
System does not require overhaul; self-test monitors health.
Diagram shows LRU locations and wire routing for GTN 6XX/7XX and GMA 35.
