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It is important to recognize up front when special measures must be taken to remove an uncooperative screw, including removing paint or any grease, and the quality of the driver. There comes a time to call in an experienced motorcycle mechanic. In general, they will look for unworn...

Possibly there are few if any regulations regarding seaplanes on that specific lake. But that lake isn't really big enough to operate a 206 (especially) more than once in an emergency without raising real noise and safety issues with the neighbors. There will be a thousand reasons raised why not.

Maybe sheet plastic films have similar optical properties to hydrocarbon fuels. That might make them absolutely disappear until the tank is drained?

If stopped in the air, will a typical stopped Rotax engine installation crank itself for restart from just diving airspeed via the prop torque?

If you still suspect the linkage, You must ground test it only by first defeating that unobvious strut assembly feature that forcibly hard-centers the nosewheel on full strut extension after liftoff. This automatically centers the nose wheel on initial touchdown to help keep you out of the...

The other part of plug removal ritual is to first remove the bottom plug, then only remove the top plug when the piston is at TDCenter when both valves are closed. Seems to me that the potential contamination crud around the piston top ring groove could be an order of magnitude more than might...

The way to being always easy to remove plugs next time without damaging the helicoil, was to carefully wire brush the threads in the cylinders with a small rotating wire brush in a drill to remove the crud. Doesn't anyone else do this? Reinstall w anti seize of course.

There is no rotating rectifier. All that stuff is on or near the stator. A key is look at the detailed nature of the failure of each alternator. It is not hard to do. I'm surprised it hasn't been flagged earlier - just to say "vibration". Of what? What broke in each case?

I all of my rambling above on torsional vibration assume that all of the failures have been on the alternator rotors. If the failures are on the stator or the rest of the stationary mechanical support system, linear accelerometers would be a valid diagnostic tool. You certainly have thrown...

My guess is there may well be a problem in the torsional vibration control system. Have there been signs of wear on the belt drive (I assume this is that version of O-470)? At least I would be very suspicious of the actual crankshaft damper bushing and drive pins dimensions. I wonder if the...

Dont plan on welding those 2024T3 alum alloy seat rails.

Trying to compensate for an engine out in a twin? - Half of them will be in someone else's airplane.

.............and we never get to find out why an engine apparently quit.

Doesn't anybody teach to combine carb heat with mixture adjustment to raise the EGT to avoid losing the engine altogether? I also see the recommendation from the Cessna (?) operating manual is to go full rich which would just make severe carb icing worse. Or is it just because of my experience...

I'd be interested to know what the breakaway torque on the crack-adjacent cyl base nut is.

Even from a failure/risk standpoint, having an occasional missing fastener in a row probably isn't the end of the world. But when the missing ones are all in a row, the possibilities of a ripping/progressive failure is a lot more critical.

Retired. Have idle metal lathe & 1 inch dia alum bar. Need dimensions. It is winter here in MN.

Clarify for this non A&P - For these six critical fasteners, it looks to me like they are each loaded in shear and retained by common low-profile shear nuts, which in turn are supposed to be cotter keyed. Shear nuts may have a torque spec (yes?) but the real problem is the lack of cotter keys.

Looks like only 4 wires are needed at the plug, and probably the two black shrink-wrapped shield wires are redundant.

Ding or bird poop on the leading edge or top of the wing? Ding on leading edge of the propeller? It does appear to me that something aerodynamic is at fault. The new need for rudder trim suggests it may be one wing, and closer to the tip rather than the root.