To Next PageTo Next PageHow 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.
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.
What to do if Garmin GTN HTAWS Audio not heard?
If you cannot hear the HTAWS audio on your Garmin GTN, first increase the HTAWS audio volume level and check the wiring. Also, allow up to 5 minutes for the TAWS audio clips to load. If the problem persists, cycle power on the GTN to verify that the HTAWS audio is working properly.
How do I fix CROSSFILL ERROR on my Garmin GPS?
A CROSSFILL ERROR on your Garmin GPS indicates an issue with unit-to-unit data communication, potentially due to HSDB wiring problems or a GTN needing service. Start both GTNs in Configuration Mode and ensure both are configured for crossfill. Check the J1002 connection on crossfilled GTN units. Ensure that P1002-10 of GTN #2 is connected to ground.
What causes 'GTN needs service' on my Garmin GPS?
The message 'GTN needs service' indicates that the Garmin GPS unit has detected an internal failure. Contact Garmin Technical Support.
Why is my Garmin GTN COM not transmitting?
If your Garmin GTN COM is not transmitting, there could be several reasons. First, check that the MIC 1 Transmit (P1003-11) input is pulled low for transmit. This can be monitored on the Discrete Inputs page found on the GTN Diagnostics page. Second, ensure that power input is connected to the COM 44-pin connector P1003-30, 43 and 44 and ground to P1003-37, -38, and -40. Lastly, ensure the input supply voltage is greater than 11VDC.
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 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.
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.
How to fix Garmin GPS when it does not power on?
If your Garmin GPS unit isn't powering on, the issue might be a lack of power to the main connector P1001. Ensure that power is correctly connected to pins 19 and 20 of the 78-pin connector P1001, and that ground is connected to pins 77 and 78 of P1001. Also, check the circuit breakers and the main avionics switch.
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.
