Garmin G5
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tazin river
- Rank 4
- Posts: 226
- Joined: Sun Dec 11, 2005 7:24 pm
- Location: Way up north
Garmin G5
The heading indicator on my G5 is about 15 degrees off. How to I correct/adjust the unit to indicate the accurate heading?
Re: Garmin G5
Disclaimer: I'm not an AME or avionics guy as such, but do have some knowledge of many of the modern GA avionics bits and pieces.
First, if it's a certified airplane, probably best to talk to the avionics shop that did the installation...
As for why heading is off, a few things;
1. Not sure if this is an ADI or HSI or a dual installation...doesn't much matter in this case though
2. does it actually have heading input? It's possible to install without, though a GPS of some sort is always required. With no heading input, you'd just get track, not heading
3. Assuming it has heading input, that'd be from a GMU 11 magnetometer
-this, in common with pretty much all modern magnetometers, is a really sensitive device
- there's a whole list of very specific mounting requirements in the STC installation manual which should all be followed..... specifications on where to mount and how to shield for lightning protection, as well as protection from stray magnetic fields - these requirements should be followed.
-these requirements include things like ensuring that power running past has a ground return and is preferable shielded (eg, if mounted in wing, you need a ground return for nav lights, NOT an airframe ground).... conventional non-LED strobe wiring can also be problematic, as can any bits of ferrous metal or motors nearby
-assuming mounting location is good, the unit can be mounted in any of the 4 cardinal directions, with one of those directions SQUARE to the aircraft longitudinal axis with body of unit level in level flight
-there is NO adjustment in calibration or software for offset from one of the cardinal directions
4. there is a software interference check and calibration to run...once done check against master compass... if still out, the thing may just be not square, and needs to be physically rotated, then calibrated again
First, if it's a certified airplane, probably best to talk to the avionics shop that did the installation...
As for why heading is off, a few things;
1. Not sure if this is an ADI or HSI or a dual installation...doesn't much matter in this case though
2. does it actually have heading input? It's possible to install without, though a GPS of some sort is always required. With no heading input, you'd just get track, not heading
3. Assuming it has heading input, that'd be from a GMU 11 magnetometer
-this, in common with pretty much all modern magnetometers, is a really sensitive device
- there's a whole list of very specific mounting requirements in the STC installation manual which should all be followed..... specifications on where to mount and how to shield for lightning protection, as well as protection from stray magnetic fields - these requirements should be followed.
-these requirements include things like ensuring that power running past has a ground return and is preferable shielded (eg, if mounted in wing, you need a ground return for nav lights, NOT an airframe ground).... conventional non-LED strobe wiring can also be problematic, as can any bits of ferrous metal or motors nearby
-assuming mounting location is good, the unit can be mounted in any of the 4 cardinal directions, with one of those directions SQUARE to the aircraft longitudinal axis with body of unit level in level flight
-there is NO adjustment in calibration or software for offset from one of the cardinal directions
4. there is a software interference check and calibration to run...once done check against master compass... if still out, the thing may just be not square, and needs to be physically rotated, then calibrated again
