Adjusting Prop Fine Pitchstop

TLDR

• Adjusted the prop fine pitchstop

Details

I need to adjust the prop fine pitchstop before first flight to ensure the RPM is not over 5800 RPM at full throttle.

I fired up the engine and waited for the oil temp etc to warm up, then taxiied to the run-up area to do this.

The engine was cranked to full throttle, while I kept the prop pitch at manual. Then as the RPM stabilized, I used the manual adjust switch in the cockpit to move the blade pitch to finer.

Once I reached 5700 RPM I started moving the blade angle.

Then I taxiied back to the hangar and removed the prop hub to expose the pitchstop adjustment screws.

Based on the service manual from Airmaster, I turned the adjustment screw between blade #1 and #3 counter-clockwise to reduce the fine pitch RPM. I was in a very quite hangar so I was actually able to hear when the pitchstop microstop switch touched the screw. That’s the spot I wanted to set.

Once the correct screw position is adjusted, I tightened the jam nut and put the prop hub back on. Then I safety-wired the screws holding the hub, and installed the spinner too. The prop was then ready for dynamic balancing which will hopefully happen next week when Brian has time.

Another oil leak

As I was working on the prop, I discovered a drip of oil hanging under the right hand side AN8 fitting at the oil return port.

This is extremely annoying. Since it’s on the suction side so it’s a big deal. I don’t want leak, and I absolutely don’t want air to be sucked in from the leak. So I will have to come up with something to stop this leak… To be continued I guess.