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Hello! I own a 1976 Mooney M20F named Loreto. This is my first post on a Mooneyspace forum, so please forgive me if I do it wrong. ◡̈ On 2/17 I heard a slow, deep, repetitive grinding noise coming from my plane after landing that I had never heard before. It was very loud and coming from within the airframe somewhere below and slightly behind the front left seat. The green GEAR DOWN indicator light on the panel was flickering a little. When I turned the master switch off, it stopped. When I turned the master switch back on, the sound and flickering returned. If I sat very still, I could feel my seat vibrating a little in sync with the sound. The DPE sitting next to me in the plane when this occurred suggested it may be an issue with my electric landing gear motor so I took the plane to the only maintenance facility on the airfield, Foothill Aircraft at Cable Airport. The mechanics at Foothill are hypothesizing... "a spring is snapping back and hitting a switch to tell the motor to continue to push the landing gear down even though it is already down and every time the spring extends the problem continues to repeat until the power is cut off." Foothill put the plane on jacks and has still not been able to recreate the problem. This makes sense because during our flight the noise only began after we were on the ground, not in the air. Worth mentioning is that my last flight was an IFR checkride where we shot three approaches in a row and extended and retracted the gear in the air twice with no issues before our final landing which was also totally fine and the landing gear came out and locked correctly. It was only after taxiing and sitting idle during shutdown that the noise began. The sound was so alarming that I do not feel safe to fly my plane again until the issue is properly identified and corrected. I am not a mechanic so my personal knowledge is limited when it comes to understanding this issue. I’m not even entirely sure it is related to the landing gear actuator or motor; or if either of these service documents (SI M20-112 or SB M20-190B) are even connected to this issue since I recently had it removed and shipped to LASAR for a complete overhaul (March 2021) and my actuator is a ITT LA11C2114 which is technically exempt from these service announcements. Have any of you heard this sound / had this problem before? Any feedback/advice would be greatly appreciated. Thank you.

My landing gear aural warning was becoming quirky. Occasionally, it wouldn't sound at all, but most of the time it would, but when the throttle was pushed forward, it would take almost full throttle before the horn would stop. Something was not right. My 74 C has electric gear, a throttle quadrant and uses a squat switch, not an airspeed switch in the warning circuitry. There are lots of iterations of the landing gear warning system, but if yours matches mine, I hope you find this of use. To make a long story short, there were simultaneously two issues: 1. The throttle micro switch had gone out of rig. 2. The sonolert was failing. I took some pictures while I had the quadrant apart and found that there is a small access to the micro switch from the left side of the quadrant under the panel material. One does not have to open up the entire quadrant to get to it, but only minor adjustments can be made through the access hole. My aircraft has two sonolerts. On the pilots side is the stall warning horn. On the copilot's side is the gear warning horn. it is a Mallory SC628P. I found new ones on eBay for less than $15. I uploaded the pictures to Mooneyspace at:

Hey all, I'm looking for an airspeed pressure switch for a 1965 M20E. I heard the switch is the same for E and F models. If you have one in good working order, please let me know.