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I have a 1984 J model and our mechanic is insisting my no back spring should be changed due to a service bulletin. My reading finds that the bad batch of these came out about 6 years after my plane was assembled. So I should have a good spring. If the spring DOES fail, will the emergency lawn mower pull gear extend still work?

The yaw damper is nice. I'd put it in again. Maybe double-check your weight and balance? Was the plane weighed, or is it the product of 40 years of + and - by well-meaning A&P's? My former C model was almost impossible to load out of CG, from my memory. Where is your trim on a normal landing? If it's not nose-up and you find it very easy to flare, that's a sign you are running aft CG. If you are lots of nose up trim and still have to pull back hard to flare, that's a sign your W&B numbers might be wrong.

Over on Beechtalk, they are considered a requirement for the V-tail Bonanzas.

Just to be clear- the 500 Hr magneto check is an "Inspection" and repair and NOT an OVERHAUL, One doesn't need to spend the extra money for a complete OVERHAUL at 500 hrs They are two different procedures. One is much less expensive than the other. IF you can find a shop to do a 500 INSPECTION only. Some won't.

I had to modify one parameter on mine fr the vertical mode. I had to change the "Static Lag' number from 1 to 2 to remove a very slight bobbing up an down slightly chasing the altitude. Just one flight to check it but it seems better although I haven't had a perfectly calm day in weeks yet. Maybe this next week will give a good day for a real good check flight.

Does your engine have the mounting boss for the alternator? If not, there is a bracket that bolts to three of the case parting bolts.

My wife is easily motion sick.

Yaw damper in a light straight wing piston single seems kinda silly to me

Good catch!

Have you done a current weight and balance? If the aircraft has been modified or changed it might be cheap knowledge.

I thought there was something in the GFC 500 STC that said the G5 or GI275 had to be the PFD but i’ve heard of others with that set up too.

Priced as shown plus actual shipping Gustlock $10 Ram suction mount $20 Tam suction ball $5 Lycoming belt 7245 $free KLN operators book $15 Bendix/King Kg 102A DG $100 2X David Clark ISOCOM both for $10 NEW—-Aircraft Components 2040-1-2 Stall and gear voice alert $300 some stuff was in a box in my 201 when I bought it and priced as such also have a wx xm weather box that I don’t know how it works $free

Hello , Thanks for the answers and help. I had an A&P look at the plane yesterday and we discovered that bolt was indeed from my plane. It was part of the alternator mounting bracket or a supporting bracket. Nothing serious but important to get right, nevertheless. Thanks, everyone!

Thanks for the tip! I'll consider that when the time comes.

This is one of those rare cases on a Mooney where the lightweight Earth X battery might make enough difference to make it worthwhile.

The problem with the breather tube is as said, it can separate. The problem with going in from the top is you need to bypass the breather tube which connects at the top of the oil filler neck. I took a small skinny funnel, I put the tube. down the funnel until it was flush with the exit of the funnel. I then filled the funnel with "Flex Seal" liquid rubber and let it sit overnight. Now the tube is fixed in the funnel. I remove the dipstick, stick the funnel in which bypasses the breather outlet and nearly connects to the oil tube below with a seal. The funnel nicely seals around the oil filler neck and the dry air gets down into the crank case. I will post a picture of my unit.

100% on the missing washer. Learning as a new M20J owner and didn't know about SB without asking here :-) If anyone could provide OD and length of bushing 914020-001 I'll work out the rest...Thanks!

I really don't mind spending a few shipping $s to get it to you to see if it works. For whatever reason there are no parts number on anything. Let me know and I'll work with you. DD

Following the checklist would rectify that

The SB doc that @47u linked is relevant, and the last page shows a figure indicating the other washer goes between the cowl flap and the cowl. With that additional washer it may help prevent the bolt from backing out since it'll let the bushing rotate more freely. Early Js had some trouble with the cowl flap hinge design and the SB shows the relevant serial numbers. Mine has been reworked a few times and needs it again, and I have to replace some of the bushings every couple of years. Your looks very good in comparison. On mine I make the bushings from brass hollow rod stock. Just saw off a piece the right length.

I'll try a heat shield, it certainly can't hurt and heat is just as likely as vibration. Thanks for the suggestion.

You are correct. I referenced IPC Figure 2 incorrectly for my serial number. IPC Figure 1 would be correct, but I don't have the setup shown with Cotter pin. From pic you can see it seems to match SB M20-231 setup as shown in Figure M20-231-5. Figure M20-231-5 does give me a better idea. I don't have the extra washer between the baffle and hinge assembly. But I'm not sure there is a bushing inside the hinge assembly at all right now which may be contributing to bolt slowly backing itself out of nut plate. What is the correct OD and length of bushing 914020-001 (so I can source one)?

I have NOT looked at the IPC, but are you sure that spacer is in the right location? To my eye the more logical location would be between the cowl flap and bracket with a washer on each side of the bracket (i.e. one under the bolt head and one next to the spacer and bracket). Hopefully, a few J owners will have input/pictures to settle this.

re: going up the breather tube, when I went to depart on Friday for MooneySummit, with I pulled on the tube to remove it, it separated inside the tube at one of the joints. Not far enough where I couldn’t get it with a pair of needle nose, but enough to end that practice and putting it into the oil fill tube from now on!

Is the installation of the ALY-8520 accomplished with an STC? I’d think that paperwork would include the part numbers for the brackets? If I remember, @Ragsf15ehad an F model (and he’s since upgraded to the Encore) but if you can track down the STC paperwork that might help your search for the right bracket.