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See if the headset jacks have insulating washers to isolate them from the instrument panel. There are stray ground currents everywhere in airplanes, especially old airplanes, and you might be getting alternator ground flow through the panel, into the headset mike and audio ground, and then to...

See if the headset jacks have insulating washers to isolate them from the instrument panel. There are stray ground currents everywhere in airplanes, especially old airplanes, and you might be getting alternator ground flow through the panel, into the headset mike and audio ground, and then to...

A damaged case and crank means a core that is worth very little at all. Why did the rod fail? Was the engine run low on oil, or did an ancient oil cooler hose rupture and pump it all overboard?

It does. BTDT, with a 150. Dove to Vne and the prop wouldn't start. Had to bump the starter. Now, if the starter had chosen that time to retire, I'd have been in trouble. I don't recommend doing this, especially over populated areas. That's just dumb. On the other hand, I had to bring the nose...

That. A second opinion is in order here.

I would get the crank at 25°BTDC (or whatever the spec is for the H2AD engine) and make a mark with a bit of paint on the front of the wheel at the little ding on the starter housing. I wouldn't go center-punching or scribing it. Might be asking for a crack. The stamped marks on the OEM wheels...

The RAF redrive I was using was a timing-belt affair. No slip, so pretty much no damping. The moment of inertia of the propeller, combined with the firing frequency of the engine, caused terrific resonance at 1400 RPM, a bit less at 2800, another at 4200, and redline was at 5600. The lower...

Yup.

Yes, turbocharged engines run much higher MPs, but turbocharged engines are not usually normally-aspirated engines with a turbo stuck onto them. They are built differently to take the higher pressures. An exception is the occasional turbonormalized engine, where the turbo maintains the MP at sea...

Yes. Right At or near sea level. But this is a cruise chart. In the takeoff and climb the mixture is richer for better cooling and detonation margin.

Here's a chart from an IO-470 manual. The 182's POH I quoted was based on the O-470-U. This is the sea-level performance cruise chart. At a max cruise of 2450, the recommended MP limit is a hair over 24". At a cruise RPM of 2100, the recommended max MP is about 23.4". I don't see any...

Over on homebuiltairplanes.com there's a retired automotive engineer whose job was analyzing engines and transmissions for torsional vibration, which is the killer of PSRUs. He can quote endless math showing what happens when the thing is not competently designed, and the "successful" PSRUs are...

See that little indent on the starter in line with the 25°BTDC mark on the flywheel? Those are your timing marks. Lycomings are easy that way. Continentals have various dumb ways to do it.

Unusable fuel is defined as that fuel that won't reach the engine in the most critical attitude. So if you have to abort a landing and go to Vx to clear the powerlines, will there be enough fuel in the tank to avoid unporting with the nose high like that? Or is your power-off, full-flap glide...

https://drs.faa.gov/browse/excelExternalWindow/FR-ADFRAWD-2023-05339-0000000000.0001 All one has to do is study the stupid POH. For the 182Q which has a Continental O-470: And... And... That is one of six pages of cruise charts for that airplane. I am constantly amazed at the...

Some Cessnas have a habit of running the left tank down first. That's because the underwing vent comes into the left tank, and the air travels from there to the right tank via a crossover tube that runs from the top inboard of the left tank to the top inboard of the right. When the tanks are...

2° in 230 hours isn't bad. You're seeing some points rubbing block wear. The larger problem is that the E-gap gets thrown off, and the spark is weakened. The E-Gap is the angle after rotor neutral at which the points open. At the correct angle, or E-gap, the distance the flux falls is maximized...

Most dangerous thing in the world, according to some mechanics: A pilot with a screwdriver.

There are no springs. Lyc O-540 O-360: Continental O-470: TSIO-520: IO-550 doesn't have any springs either. In what engine did you see springs as part of the dynamic counterweight assembly?

Improper MP/RPM sequence detuning the counterweights? That's the first time I've heard that, and I'm a retired aircraft mechanic, commercial pilot and flight instructor. No, the concern is detonation. Too much cylinder pressure at lower RPM can cause detonation and serious engine damage...