rwiseman

Self-answered. Amazing what ChatGPT AI comes up with. ”In the 1982 Mooney M20J, the fuel selector knob is secured to the shaft using a set screw that is often a small Allen head or hex screw. Here’s a more detailed breakdown of how it typically works: 1. Knob Design: The fuel selector knob has a hole or a recess that fits over the selector shaft. The knob is usually made of a durable material like metal or reinforced plastic. 2. Shaft: The selector shaft has a flat side, which provides a surface for the set screw to press against. This flat side prevents the knob from rotating freely on the shaft and ensures positive engagement. 3. Set Screw: The set screw is inserted through a threaded hole in the knob. When tightened, the set screw presses against the flat side of the shaft. This creates a frictional hold that keeps the knob securely in place. The set screw is usually tightened using an Allen wrench or hex key. 4. Installation and Removal: To install the knob, you align the knob hole with the shaft and tighten the set screw until it is firmly against the shaft. To remove or adjust the knob, you loosen the set screw, allowing the knob to be repositioned or removed. If you need to replace or adjust the set screw, ensure you use the correct size and type of screw specified in the aircraft’s maintenance manual to maintain the integrity and safety of the fuel selector assembly.”

I am replacing the fuel selector placard that is under the selector knob in the floorboard between the front seats of a 82 J. That requires that the selector switch be removed from its shaft. What holds the knob on the shaft? Is that a pin, an Allen screw, or what? The service manual shows a vertical screw going through the knob into the shaft. That is not the case here. It is something else horizontal through the shaft and extremely small. Thanks.

Yes, lots of info in the service manual. Thanks for the point. I should have gone there first. thank you all for the advice.

Hmmm. Then even more gremlins. With cluster breaker pulled, Left low fuel turns on solid and push to test turns none of the others on. I’ll reverify that. And look for a separate annunciator circuit breaker. Thx.

Chasing electrical gremlins on a 1982 J. 1. On the ground, when pressing the annunciator test switch the Left Low Fuel light does not come on. Performing the same test airborne it works every time. And when airborne it lights up correctly when left tank is low. 2. while troubleshooting an intermittent Oil Temp gauge, pulling the Cluster Gauge circuit breaker correctly removes power from all the cluster gauges and the annunciator light panel except that the Left Low Fuel light illuminates. To trouble shoot #1, the bulbs were swapped. No luck. And the annunciator panel was replaced. Again no change in symptoms for #1. For #2, I’m not sure where to start. Why is that light receiving power with the breaker pulled? This may be a cross wire issue where I just leave it alone since it causes no harm, and continued troubleshooting could cause more harm than good. Thoughts?

What springs out when you remove a Mooney panel. :-) Be careful not to stuff the gremlins back in when you finish. Looking forward to seeing the finished product.

@carusoamOh yes. I’m following. I found that log entry and other posts with tips on flight physics and reasons not to violate POH limitations interesting reads. But my question was really simple and I believe too much was read into it. I just wanted to know if any one had tried it. That logbook entry proves someone did almost 30 years ago. My 20J is closer to 40 yrs old. I had/have no intent to fly my plane in acrobatics. Not a newbie to my plane, I just don’t post often, I’m flying instead. And yes I have received acro instruction for all who recommended the same. Falling off, dropping the nose too steep, too much speed, not enough roll authority, short coupling, slow gyro rate of change, all good info and somewhat expected. So those who may have tried it anyway, how did it go for you? One of the early posters may have hit the nail on in the head with the response “if they did, they are not going to talk about it in a public forum.” :-) Thanks all for posting.

Have any readers attempted basic acro maneuvers in a M20J. (Aileron roll, barrel roll, split-s) and what was the experience? Please, no flaming. This is not a discussion regarding the POH warning that acrobatics are not allowed. Fully aware. I am curious if anyone tried it anyway despite the well known limitation. And what happened. First hand knowledge only please (proves you survived). I am not advocating anyone try it. I am not phishing for the authorities.

7/16 add: 1 rwiseman (Wiseguy) thx

1982 M20J: Are the air intake vents (scoops) supposed to have screens in them to keep dirt and bugs out of the cockpit? This aircraft's vents are completely open to the environment. Thanks in advance.