G3x horizon malfunctioned

[Andy]

Hartzell props said the constant speed prop warranty doesn’t start till I fire up the engine, however, the prop has a shelf life - it needs servicing within 2 years of use. I’ll need to take it to a prop shop for inspection and grease servicing.

The trailblazer prop requires servicing once a year but it's really easy to do. Make sure you use the same grease it was built with or it will have to be dismantled to purge the mixed greases. The grease type should be on a sticker on the hub. I keep one grease gun just for the propeller.

If you plan to do your own maintenance you should have the Hartzell manuals in your data library.

[jmorrical]

I have removed the original GSU 25C ADAHRS (010-01071-50) and installed a new 011-02929-55 ADAHRS. To improve success I also added a support tube connecting the fuselage frame tube above to the remote transponder rack like Troy's installation. This likewise stiffens the avionics tray where the ADAHRS is mounted. Now the avionics tray has no play.

The pitch/roll offset test, magnetic interference test and the engine run-up vibration tests all passed. I expect my pitch attitude / horizon issues are resolved. The magnetometer had to be realigned also.

My support brace was made from 1/2" X .016 aluminum tubing available at my local Ace Hardware. It is connected to the fuselage tube with a non-cushion O'dell clamp. I couldn't close and line up a more difficult cushioned clamp because of the confined working space around wires. The LRU tray and the remote transponder rack has no movement now.

Attachment 13229

[Andy]

Thanks for the report and the picture. I have my GTR 200 under the transponder so may consider adding a brace myself. There is some flex in my installation but no abnormal vibration.

[jmorrical]

Just an update after the -55 ADAHRS replacement and my 'TroyBranch Modification'. I've flown my EX (1) almost 30 hours now and the ADHARS has performed flawlessly.