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You can definitely have voltage loss where there’s resistance through a bad/corroded connection or circuit breaker. The higher one is likely the voltage on your bus. Trace the lines and check each connection with a dvm to find where the drop is for the lower one. I had a similar problem and found a looses connection to a circuit breaker. It doesn’t take much.

My EDM 730 and AV 30 both display voltage but the AV 30 reads .5 volts lower. Is that common? How can the difference be explained if they’re wired to the same buss? I’m haven’t checked with a volt meter to see who’s providing ground truth.

No one has directly answered your question because nobody had a 3-blade blackmac and went to the MTV-12 propeller or if they did they did not post their results here with before and after test. You are the first, please post your results here after you do the switch so you can help other people out when they face that same decision, although with the factory not putting on a 3-blade blackmac I doubt there is very many other pilots in your shoes. Maybe ask the bonanza forum to see if they have had someone make this very switch before.

Could you pm me his info ? Looking at doing this upgrade . thanks

Having the RPM and MP data close to knobs that controls them is a nice to have… This is especially helpful when you have vernier controls on the engine control knobs…. Dial the knob, watch for the result, undial the knob to the exact spot if gone too far. having two VORs close together is important for the day you need to identify an intersection without your GPS working… HSIs have mostly eliminated the second (pair) of VORs… Multiple GPSi in the cockpit have removed the danger of having a single gps failure… PP thoughts only, not an instrument guru… Best regards, -a-

Do you have an ETA?

A good powered driver… And a fist full of proper SS hardware… A few screw driver bits, because they can wear and destroy screw heads… The first time… replacing a lot of screws and other hardware can be expected… Avoid opening the fuel tanks accidentally… this has lead to fires a few times… the panels that are riveted on mine, conceal the mag compass for the HSI… the rivets are brass. if you can plan with the layout drawing in advance… that helps a lot… otherwise, taking all the panels out, gives a great view of everything…. The parts manual lists all of the screw types and sizes you need… Find the sheet metal screws that aren’t the pointy ones. The machine screws come in different lengths and diameters… Avoid using too long screws… they can cut into parts that move close by…. there are pics around here for all the things that can happen during and after an annual…. Best regards, -a-

Mine is in the same position as @Pasturepilot I think the placement is perfect.

As far a big G supplying expensive boxes to Mooney owners goes… Mooney is NOT dead to them… (Somewhat recently…) Big G did a great job knowing every detail needed to install certified APs in a wide range of Mooney models from mid 60s M20Cs up through modern versions… It took several owners to supply their planes for a set period of time… APs are more challenging to install, and don’t cost nearly as much as a few color screens…. Just need to make it happen… It may help to know who our new big G guy is… we used to have to hunt Trek down for that…. Best regards, -a-

My fear is always about the power lines that you can't see until you're right on top of the road.

I can't find it, but I think there were some studies that showed it was an old wives tale and there were excellent results with landing on a road. Not talking about a stop'n go roads, but more open roads with less traffic. So a rural area like where this plane landed is a perfect example. Wish I could find where I read or heard this...

When IO550s were new… A bunch of Cirri and a Mooney suffered from cracked oil coolers… Drain all of the oil out of an oil cooler… and your day goes downhill at best glide speed… The Mooney reportedly landed on a golf course… There were a bunch of oil cooler replacements in early M20Rs for that reason…. Continental also manufactured the oil cooler…. Do you wake up screaming Fore!, and you’re not a golfer…? as far as ethics go… keep in mind, a Mooney landing gear up on pavement will be stopped in about 200’… As far as danger goes… avoid roads if there are fields available… a stout sign post or guy wire can cut a fuel tank open on your trusty Acclaim… getting out of the flaming wreckage may be extra challenging… Best regards, -a-

I've wondered a hundred times whether the Challenger pilots would have walked away if they had left the gear up. It's very similar to the recent Mooney accident where the pilot landed on a city street and slid into a storefront. In both cases, it looked like a masterful emergency landing, but the rolling aircraft still had a lot of energy to dissipate, and the brakes weren't enough to prevent a collision on rollout.

But yet @whiskytango walked away and there were no injuries. The pilot in the M20C on this post had no injuries and it doesn't look there's a scratch on the airplane. Everyone in that situation makes a split-second decision that they feel is right at that moment. No way am I going to second-guess someone who walks away from that and say that I could have made a better choice. I wasn't there. In googling "highway landing airplane", these came up: https://time.com/6564611/virginia-highway-plane-emergency-landing/ https://www.nbcnewyork.com/news/local/small-plane-lands-on-long-islands-southern-state-parkway/5153466/ https://www.cbsnews.com/colorado/news/single-engine-plane-emergency-landing-colorado-highway/ https://www.nbcdfw.com/news/local/twin-engine-aircraft-makes-emergency-landing-on-u-s-80/3414552/ https://www.facebook.com/watch/?v=806377084222657 https://www.wtxl.com/traffic/airplane-lands-on-interstate-10-in-suwannee-county https://www.nbcmiami.com/news/local/small-plane-makes-emergency-landing-on-roadway-in-parkland/3225530/ https://www.wsaz.com/2023/07/15/video-shows-plane-taking-off-highway-after-pilot-forced-make-emergency-landing/ https://www.hurlburt.af.mil/News/Article-Display/Article/3384104/highway-turned-runway-us-air-force-crews-land-on-wyoming-highways/ The only one that I found that had no chance was the Challenger in FL in February. The pilot and co-pilot died but the fight attendant and two passengers walked away and no one on the ground had serious injuries. The crew did a great job of avoiding a neighborhood. And even this funny one:

How would one know… The oil ring is a bit gummy? Then… How would one know… The oil ring has been cleaned? Sounds like… Oil may be showing up in the lower spark plug? A sign that the oil ring isn’t doing its job… could be a cylinder surface quality issue as well… If sending a camera down the cylinder is possible… be on the lookout for polished surfaces where they used to be cross hatchings. +1 for selecting a solvent mix that is good at dissolving carbon… PP questions only, not a mechanic… Best regards, -a-

@AH-1 Cobra Pilot Any chance you have a High Boost / Low Boost switch for a Klixon?

A link to another thread discussing this very issue. Highly recommend folks read what @whiskytango wrote.

I would second having AeroComfort do your work. It’s well worth the logistical challenges you may find in having to ship pieces back and forth. He’s done a few pieces for my two Mooneys and I’ve been nothing but pleased.

I would never want to second-guess a successful emergency landing with no injuries to person or plane, but I usually think of a highway as a last-resort landing option. I wonder what factors led to the highway decision.

Several items that I've sold or wanted to buy in the last year have attract scammers. I love them. I like to mess with them. Sadly my "WTB Turbo Encabulator" ad didn't generate any offers. "My dad has one, send money to prince@nigeria.net"

Most excellent outcome. I've driven that stretch of highway many times. At about 3:00 on a Sunday afternoon it should not be too crowded. However, in the news video you can see an overhead power line across the road right where the airplane is parked. As @whiskytango's experience has shown us, they can cause an easy emergency landing to become a difficult emergency landing. There are lots of good fields to land in around there. Many.

It helps to know your customer… (banking rule) It helps to know your seller… There are known MSers…. there are 10X unknown MSers… to see how well known somebody is… Click on their avatar and look for two details… 1) Member since… the longer, the better… 2) Post count…. the higher, the better… 3) A third detail… is the email address they have stored here… if their stats are… last Tuesday, and a dozen…. This is a sign of an unknown entity… not horrible, just unknown. if their email doesn’t match the one they have stored here… that kinda raises eyebrows… A good buyer may arrive here by using a Google search… a scammer may arrive here the same way… If buying pre-flown Mooney parts… We have a list of about four people that do this as a pseudo business… (not a full time job) and hundreds of other MSers that offer services every day around here… Best regards, -a-

I fly 1000 mile cross-countries several times a year. At first did it all in my C by hand. Arrived at my destination too tired. Then like you I gathered the parts and installed an Accutrak II first in our C. It was a fantastic magenta line follower. But, after I finished my IR and started asking for diversions around buildups I started to covet the Accuflite. Installed that my nav problems were all solved. Life was so good, except for altitude hold. Next I pieced together the parts for the Brittain AH system, and with the help of some resident knowledge here, got it working. Ended up with a full two-axis autopilot, all done by tubing and rubber bands! Now I fly a J with a "modern" autopilot- the 1980's vintage Bendix-King KFC-150. Honestly, the Brittain wing leveler does a better job than the BK at keeping the wings level in turbulence because it is more responsive and smoother. The dynamics of the Brittain wing leveler are just unbeatable it seems. The altitude hold on the BK system is very aggressive at maintaining altitude within 20 ft. The Brittain altitude hold had more like a +/- 60 ft variance, and provided a much smoother ride. In mountain wave turbulence I just have to turn the BK altitude hold off or it will make my passengers (or me) puke. The Brittain altitude hold, while responsive, seems a better match for the flight dynamics of a small airplane. The Accutrak II would sometimes wander a bit. Seemed random, but more likely to happen after several hours of a long trip. The Accuflite of course depends on the rate of gyro precession on your DG- that would make long distance flights without the Accutrak a little zig-zaggy. If you can find all the parts, I'd recommend putting in both. You can use the Accuflite to help in maneuvering (e.g. holds) too if you need to look at an approach plate or weather data on your iPad while shooting an approach. It's all great for workload reduction.

is that a new dent causing the challenge? or…. Let’s see why one cylinder is reading differently than the five others… often, the odd one out is using a different sensor in a different cylinder location… Check where your ship’s CHT gauge is, and see where the JPI sensor is… To check if it is a sensor challenge, a simple swap of sensors between adjacent cylinders can prove what you are seeing… There is a good chance that somebody installed a ring sensor, to get it to read 50°F too high… bad ring sensors double as spark plug gaskets…. Crummy ring sensors are mounted on the TC well for the regular CHT sensor… PP thoughts only, not a mechanic… Best regards, -a-

Go O! +1 for hangar protection… That, and a good PPI is the best protection your wallet can get. Best regards, -a-