Fearless Tower
Touchdown! Greaser!
So the other day while taxiing back to the ramp, I noticed a whining/squeaking sound. Basically sounded exactly like squeaking brakes as if the brake pads were rubbing slightly. Only problem- the sound continued after I came to a complete stop. Not the brakes.
Went flying again today and noticed it again coming back to the turndown. I sat for a minute and tried to narrow it down. Shut off the avionics master and took the headset off. Still there. Played with the throttle a bit and found that it seems to go away at about 850 rpm. Engine idles at 600. So it is definitely there between 600-850 rpm and then goes away as you increase throttle.
Airplane is a 1948 170 with 0-300.
I am thinking the tach may be going bad, but wondering if it might be the generator.
Any way to isolate it, or any other thoughts?
Went flying again today and noticed it again coming back to the turndown. I sat for a minute and tried to narrow it down. Shut off the avionics master and took the headset off. Still there. Played with the throttle a bit and found that it seems to go away at about 850 rpm. Engine idles at 600. So it is definitely there between 600-850 rpm and then goes away as you increase throttle.
Airplane is a 1948 170 with 0-300.
I am thinking the tach may be going bad, but wondering if it might be the generator.
Any way to isolate it, or any other thoughts?