Stats:
Aircraft Type: RV-4
Engine Type: Lycoming IO-320 B1A (160 hp)
Propeller Manufacturer: MT (Hub Model: MTV-12-C 3-Blade)
Prop Governor: Woodward (Model: M210689)
Problem: Had an issue with the prop control about a month ago. Prop would not cycle during the 1800 rpm run-up (tried about 20 times). Came back to hangar and worked governor manually several times and made sure no loose bracket or control assembly. Everything looked good. Ran the engine at 1800 rpm and prop cycled good during a dozen cycles.
Flew the aircraft 5 times. At each run-up cycled the prop (about 2 times) before takeoff. After flights did confidence check run-ups and again cycled prop (about 2 times). I also worked the prop during the flight multiple times (approximately 10 times). Everything worked fine.
Flew twice a week ago. First flight had no issues.
Second flight:
1. Run-up at 1800 rpm was good with two cycles of prop.
2. Takeoff roll was good with about 2720 RPM and approximately 23? manifold.
3. Shortly after airborne prop raced up to 2850 rpm (noticeable sound and feel) and prop control was not effective.
4. Pulled closed with about 18? manifold to keep prop below 2700 rpm.
5. On downwind, cycled prop control several times unsuccessfully for about half the downwind.
6. On second half of downwind just before base, prop started to work normal, and I cycled it several times with normal results.
6. After landing did another run-up at 1800 rpm and prop cycled normal about a dozen times.
Removed governor (Woodward) and sent to Ameritech. Tested good.
I am out of ideas. Anyone with similar problem and what was the fix. Thanks.
Aircraft Type: RV-4
Engine Type: Lycoming IO-320 B1A (160 hp)
Propeller Manufacturer: MT (Hub Model: MTV-12-C 3-Blade)
Prop Governor: Woodward (Model: M210689)
Problem: Had an issue with the prop control about a month ago. Prop would not cycle during the 1800 rpm run-up (tried about 20 times). Came back to hangar and worked governor manually several times and made sure no loose bracket or control assembly. Everything looked good. Ran the engine at 1800 rpm and prop cycled good during a dozen cycles.
Flew the aircraft 5 times. At each run-up cycled the prop (about 2 times) before takeoff. After flights did confidence check run-ups and again cycled prop (about 2 times). I also worked the prop during the flight multiple times (approximately 10 times). Everything worked fine.
Flew twice a week ago. First flight had no issues.
Second flight:
1. Run-up at 1800 rpm was good with two cycles of prop.
2. Takeoff roll was good with about 2720 RPM and approximately 23? manifold.
3. Shortly after airborne prop raced up to 2850 rpm (noticeable sound and feel) and prop control was not effective.
4. Pulled closed with about 18? manifold to keep prop below 2700 rpm.
5. On downwind, cycled prop control several times unsuccessfully for about half the downwind.
6. On second half of downwind just before base, prop started to work normal, and I cycled it several times with normal results.
6. After landing did another run-up at 1800 rpm and prop cycled normal about a dozen times.
Removed governor (Woodward) and sent to Ameritech. Tested good.
I am out of ideas. Anyone with similar problem and what was the fix. Thanks.