Why Garmin GNS 480 heading differs greatly from compass system (synchro hdg only)?
If the GNS 480 heading differs greatly from the compass system (synchro hdg only), check wiring, synchro X,Y,Z legs are crossed, 26VAC reference Hi and Lo are swapped. Verify that GNS 480 and compass system are using the same 26VAC reference.
Why do GPS signal levels drop when avionics are turned on in my Garmin GNS 480?
If the GPS signal levels drop when you turn on your avionics, it might be due to noise interference from other avionics. To resolve this, turn off all avionics and then turn them on one at a time to find the source of the interference. Additionally, try routing the GPS cable and positioning the GPS antenna away from potential sources of interference.
Why Garmin GNS 480 is not receiving heading from compass system (synchro heading input used)?
If the GNS 480 is not receiving heading from the compass system (synchro heading input used), check that the heading valid input (P5-57) is > 9 VDC. The state of this input can be checked in Ground Maintenance Mode. Also, check that 26VAC, 400Hz reference is supplied to P5-20,39. Check wiring.
What to do if ARINC 429 device is not receiving data from Garmin GPS GNS 480?
If an ARINC 429 device isn't receiving data from the Garmin GPS GNS 480, check the ARINC 429 output port setting for the port that the device is connected to. Also, check the ARINC 429 output port speed setting for the port that the device is connected to and verify that the speed is correct for that device. Finally, check the wiring.
How to troubleshoot autopilot not getting GPSS/Roll Steering data from Garmin GPS GNS 480 (ARINC 429 Roll Steering used)?
If the autopilot is not receiving GPSS/Roll Steering data from your Garmin GPS GNS 480 (using ARINC 429 Roll Steering), first ensure that the GNS 480 has acquired a GPS position and a flight plan is entered. Then, check the ARINC 429 output port setting for the port that the autopilot is connected to. Also, check the ARINC 429 output port speed setting for the port that the autopilot is connected to and verify that the speed is correct for the autopilot. Finally, check the wiring.
What to check if Autopilot is not getting GPSS/Roll Steering data from Garmin GPS GNS 480 (RS232 Roll Steering used)?
If the autopilot is not getting GPSS/Roll Steering data from the Garmin GPS GNS 480 when using RS232 Roll Steering, make sure the output port setting is MAPCOM for the port that the autopilot is connected to, and check the wiring.
Why are Garmin GPS signal levels very low?
If the GPS signal levels are very low on your Garmin GPS, check the GPS antenna installation, connections, and cable routing. The GPS antenna must be mounted on the top of the aircraft. Also, make sure the aircraft is clear of hangars, buildings, trees, etc. Another cause can be RF interference at 1575.42 MHz from VHF COM, in this case move GPS antenna further from the COM antenna, add a 1575.42 MHz notch filter in COM coax, fix or replace the COM, disconnect the ELT antenna coax to check for possible re-radiation.
What to do if my Garmin GPS GNS 480 does not compute a position?
If the GNS 480 isn't computing a position, ensure a correct position, time, and date have been entered. Check the GPS antenna connections and make sure the aircraft is clear of obstructions like hangars, buildings, and trees.
Why do Garmin GPS signal levels drop when avionics are turned on?
If the GPS signal levels drop when you turn on your avionics, it's likely due to noise interference. Try turning off all avionics and then turning them on one by one to find the source of the interference. Also, route the GPS cable and antenna away from potential interference sources.
How to troubleshoot a Garmin GPS GNS 480 that does not power on?
If your Garmin GPS GNS 480 does not power on, ensure that power is connected to the main 37-pin connector at P1-1 and 16, and ground to P1-2 and 20. Check the circuit, breakers, and main avionics switch.
General| Display Type | LCD |
|---|---|
| Interface | RS-232 |
| GPS Receiver | 12-channel |
| Database Storage | Jeppesen database |
| Navigation Capabilities | IFR/VFR, enroute, terminal, approach |
| Approach Types | ILS, VOR, LOC, GPS, WAAS |
| Compatibility | Compatible with most EFIS and autopilot systems |
| Operating Temperature | -20°C to +55°C |
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