I have a nearly new G3X touch system in my RV-14A. It mostly works flawlessly except when it doesn't. The engine is a Lycoming YIO-390-EXP33 Thunderbolt with a constant speed propeller from Whirlwind (HRT-74).
When I am doing my run up at the end of the runway prior to takeoff, I advance the throttle to 1700rpms for the mag check. I then pull the prop control out to course pitch. The RPMs rapidly drop (as they should) and the ADAHRS immediately tumbles (typically completely upside down).
Several seconds later it rights itself, but if I pull the prop again it will tumble again.
I saw it do the same thing once in the flair for a touch and go but generally in flight I do not have any problems.
During installation I did the vibration, interference and calibration tests on the ADAHRS and the magnetometer as per Garmin's installation manual and they all passed.
The G5 which gets pitot and static air from the same source does not tumble.
Christof at SteinAir had me redo the calibration but that did not help.
I have a video I made of it tumbling just in case anyone thinks I have been drinking.
Any thoughts, recommendations etc. appreciated.
SteinAir said it could be a bad GSU25 and they could RMA it but I thought I would see if anyone has any other ideas first.
Thanks and happy new year!
When I am doing my run up at the end of the runway prior to takeoff, I advance the throttle to 1700rpms for the mag check. I then pull the prop control out to course pitch. The RPMs rapidly drop (as they should) and the ADAHRS immediately tumbles (typically completely upside down).
Several seconds later it rights itself, but if I pull the prop again it will tumble again.
I saw it do the same thing once in the flair for a touch and go but generally in flight I do not have any problems.
During installation I did the vibration, interference and calibration tests on the ADAHRS and the magnetometer as per Garmin's installation manual and they all passed.
The G5 which gets pitot and static air from the same source does not tumble.
Christof at SteinAir had me redo the calibration but that did not help.
I have a video I made of it tumbling just in case anyone thinks I have been drinking.
Any thoughts, recommendations etc. appreciated.
SteinAir said it could be a bad GSU25 and they could RMA it but I thought I would see if anyone has any other ideas first.
Thanks and happy new year!