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Moustafa, Control knobs not working properly is bad... Looks like you may have a classic wear challenge for your control cables... Something is falling apart...? Check your logs to identify how old they really are. There is a classic replacement solution documented around here as well. The guidance for age for engine controls is generally matched to engine TBO.... You can start with visually inspecting both ends of the cable... looking for fraying or anything that is falling apart. The important thing to consider... if a cable falls apart... you may not have control of the engine... Check your logs for all three cables, inspect all three cables... If you need new cables look up macfarlane, and follow the procedures for owner produced parts... See if you can see what is on the other side of the panel... that is where the micro switch sensor rides along the the throttle shaft... PP thoughts only, not a mechanic.. Best regards, -a-

There are a few pages written by a guy named Bob Kromer... Really helpful when determining which Mooney is best for your mission... Not so much of how to do a PPI... Very few ADs on either of those... If you are good at reading Log books and taking notes... You will find most of the paperwork challenges... clean logs probably have an AD history book to go with them... Best regards, -a-

Somewhere around here somebody posted a similar question regarding the 1/2ati..... Lets ask @Aerodon See if that helps..? Best regards, -a-

Technically, the side window... when open draws air out of the cabin... you will notice when the window gets closed, it is pulled shut... Could be the bird’s internal alarm... flying low and slow isn’t her thing... she just wants you to know that... So.... If air is being pulled out through the side window... that air needs to be replaced by some air from somewhere else.... Be on the look out for any missing screws, or seals in the plane... Any change of attitude will change how the exhaust exits the pipe and travels along the fuselage... PP thoughts only, not a mechanic... Best regards, -a-

6+ years seems to be the going Number for Concorde... This is where you get it charged up and perform a capacity test... There are a handful of things that can cause what you have described... from dirty connections, to a mis-set voltage regulator... What does your volt meter tell you? PP thoughts only, not a mechanic... Best regards, -a-

Camping under the wing has a new meaning.... When your plane is that big! Similar MGTW and HP as an O3, but much longer legs! Great pic, thanks for sharing it. Best regards, -a-

Kind of odd that it is altitude sensitive... You have documented the situation really well... The issues I wrote about were more system leak oriented... Wish I could have helped a bit more... On the other hand... We have a really good AP guy around here that has some really good insight.... let’s invite @Bob Weber to the discussion... Best regards, -a-

Way cool TonyK! Eric, See if I got these right.... I put some blue arrows pointing at the various planes... That is holy cow huge! Best regards, -a-

Blowing things out of the instrument systems... is highly NOT recommended... By anyone, for any reason, at any time.... Unless your O1 has gone all digital... the old mechanical gauges are still very sensitive to compressed air... Phew... got that out of the way... At the back of the BK APs is a hose that connects the AP box to the static system... Depending on who did the install, and what hose type they used... its proper connection to the static system may have been lost... See if you can get a look at the back... if you see a yellowish broken rubber hose hanging down... That has been a common cause for APs that have lost control of their altitude hold.... Other things to double check... static air drain... sometimes the drain loses its seal.... Go O1! PP stuff I have read about on MS, not a mechanic... Best regards, -a-

Demand seems to be outstripping supply this summer... Half of the world’s economy is very strong. @Chief Pelican posted the plane for sale... It has a few replies on the thread... We should set up a place on BT for negative opinions.... Best regards, -a-

Summarish... 0) Could be instrument related... could be a real problem... 1) Pics are required... for proper discussion of FF sensor installation challenges... horizontal... Or slight incline for better bubble handling.... no nearby elbows... in or out... not next to hot or vibrating things... 2) Bubbles... either air leaking in or vapor related... if you are getting higher numbers than expected... bubbles are often the challenge... fuel injectors systems have a way to handle bubbles once started... 3) vapor is usually a challenge related to hot starts... if you suspect vapor to be a challenge, sometimes running the fuel pump adds enough pressure to help move the vapor through the system... 4) New plumbing... nothing makes you feel like a leak is occurring like High FF with a new sensor... The K has one of the most complex fuel systems of any Mooney.... lots of places available to have a leak... Start with the new plumbing... Usually when a fuel line has bubbles drawn in during operation.... blue stains occur while it is not operating... PP thoughts only, not a mechanic... Best regards, -a-

We have a few options... New... ask Dan at Lasar... Used... @Alan Fox @Jerry Pressley @SheryLoewen That’s the short list... If you acquire an old one... it can be OH’d by Lasar... PP thoughts only, not a mechanic... Best regards, -a-

Rj, Check out the catalog I posted above... Around page 20 or so it has the older style DGs. Each one has connection details... You might even recognize the one you have..? Best regards, -a-

Welcome aboard, Frank. What took so long? Glad you joined the MS party. Look up the proper DAC model... to match your existing system... The used ones are getting plentiful. See what eBay has it priced at... Add that to your cost comparisons... Best regards, -a-

Great pirep, Richard! Best regards, -a-

Got a model number? https://www.kellymfg.com/images/RC ALLEN Catalog.pdf -a-

Great logic for the old FAA... It kept people from going to the doctor for as long as possible... The new FAA wrote some logical rules. Listed dozens of meds that can be used while flying... And SIs for certain individual cases... Either way, I don’t want to have to go to the hospital for Covid or anything else... Plan A: Stay healthy! Stand by for clarification on that letter... might be time to send a letter to the AOPA... Best regards, -a-

MS works in interesting ways... Contact cleaner generally comes in a spray can... CB switches have a tendency to spark when used.. Each spark knocks off a dust particle of metal... and probably oxidizes it at the same time... The good thing... now you know where the problem is... if it doesn’t clean up, it is pretty sorta easy to replace... Congrats on the problem solving details... PP thoughts only, not a mechanic... Best regards, -a-

Unlike houses... there are no comps in the neighborhood... actual selling prices are only known to the buyer and seller... not to the casual observer... There aren’t even that many for sale at any one time... Fortunately, if you find the right Mooney, in the wrong neighborhood.... it doesn’t take very long to relocate it at Mooney speeds.... Buying used machinery can be fun... it can also take a lot of time... The first time a buyer spends a lot of time looking for the right plane, determining the exact price he wants to pay for it, he finds out quickly the plane moves really fast on its own.... The second time a buyer is looking for the plane... he knows exactly how much he is going to pay... ownership can occur in about two weeks... 0) PPI 1) Finance 2) Insurance 3) Training 4) Delivery Flight... The act of buying a plane across the country can be an extra challenge... Helps to have all these ducks lined up when ready to pop the question.... PP thoughts only, not a plane sales guy... Best regards, -a-

Where do I find the push to buy now button? -a-

Interesting, Similar challenge... Air that flows through the cooler mounted up front... dumps air/pressure below the cylinders... again not very helpful for cylinder cooling... It would help if we had a few pressure sensors to put in various locations around the cowl... I think David had to demonstrate everything working in concert during his cowling development phase... Early days of the guppy mouth... air was known to form eddy currents above the cylinders, some air would come back out, throwing dripped oil back out and on the windscreen... Fortunately what we have works over a wide range of conditions... In deep cold, Ovations have a plate that blocks half of the oil cooler at the back of the IO550.... A similar balance of air flow exists here as well... except Os don’t have cowl flaps to close... Lots of variables... Air flow through the cooler... Oil flow through the cooler... OAT... OilT... Where the waste air, pressure and temp, goes.... How well the Vernatherm is working... if it doesn’t work properly, less oil gets pushed through the cooler... Makes that... always leave the flaps 1” open, make a lot of sense.... more sense today, than ever before... PP thoughts only... Best regards, -a-

Use extra caution using low volumes of water on gritty type dirt.... You don’t want to end up with sandy dirt in the cleaning towel... sanding and scratching things.... PP thoughts only, -a-

Tom’s pic looks like a relay... If you have a switch that doesn’t seem to work... Chase the wires to see where they go... be on the look out for a relay.... relays don’t last forever... often like to be cleaned... PP thoughts only, not a mechanic... Best regards, -a-

One interesting detail... so it seems... The oil cooler depends on the amount of air flowing through it... The more air that flows through the oil cooler... the better the OilT will be... That air is competing with the cylinder cooling air... The more air that flows through the cooler at the back of the cowling.... The less air is available to get pressed down through the cylinders... Air flowing through the oil cooler is now by passing flowing down through the cylinder fins.... This can make choosing by the charts and graphs a bit more challenging... Keep an eye on CHTs after install... If you get good oilT and lousy CHT... adjusting airflow through the cooler may be an option... PP thoughts only, not a mechanical engineer... Best regards, -a-

Speed Mooney.... Long time no see... +1 throttle switch... that and gear up, activates the gear up horn... Nice to see you... Best regards, -a-