R-Banger Posted June 24, 2020 Report Posted June 24, 2020 Adjusting my microswitch so it doesn't go off at 18" MP and was curious where everyone else was having them kick on at. Looking to set mine at 12-13". Quote
RLCarter Posted June 24, 2020 Report Posted June 24, 2020 I've seen the spec in the Maintinace Manual, but can't seem to find it Quote
carusoam Posted June 24, 2020 Report Posted June 24, 2020 The switch is under the IP on the throttle... the little wheel drops into a detent on the throttle... Have it set somewhere near the spec... which is probably around 13”... definitely above 12” These are throttle settings you only use when you are committed to landing... When set higher... you will find the horn coming on while Descending to TPA... you will be busy... and silencing the gear warning with your finger in the hole... PP thoughts only, there are plenty of pics around here for the switch... Best regards, -a- Quote
Skates97 Posted June 24, 2020 Report Posted June 24, 2020 It's a pretty easy adjustment, mine is set to come on right about 14". When I get into the traffic pattern I'm at 15", if I'm flying a typical pattern I drop gear a beam the touchdown point and then reduce to 13", so having it come on at 14" is perfect for me. It hasn't happened yet but if I forgot gear and pulled to 13" like normal then that warning at 14" is perfect. So, about adjusting. Go up and fly. Have a sharpie handy. Reduce power until you have it where you want the warning to come on and make a small mark on the shaft. After you land it will be easy to set the throttle right where you want it and then adjust the switch. It's just a couple screws and the switch slides around. You will be able to hear it click as you slide the cable in and out so you will know right where it will turn on. Tighten the screws back up, go fly, and check the setting. 2 Quote
RLCarter Posted June 24, 2020 Report Posted June 24, 2020 (edited) Found it, it is part of the annual/100hr inspection I downloaded from Mooneys website (Item 20) Edited June 24, 2020 by RLCarter 1 Quote
David Lloyd Posted June 24, 2020 Report Posted June 24, 2020 The 1975-1978 C and E POH says 12". Couldn't find it shown in the earlier models. Most likely the same. Quote
MBDiagMan Posted June 24, 2020 Report Posted June 24, 2020 (edited) Mine is between 12 and 13. I don’t remember what I ran into, but adjusting was NOT simple in my case. I had to correct how the switch was mounted before it was in the correct range, so don’t assume that it will be ten minute job it’s supposed to be. If it turns out to be a problem, search for a thread that I started probably a year and a half or so ago. There are pictures and I posted the solution to what I ran into. Edited June 24, 2020 by MBDiagMan 1 Quote
RLCarter Posted June 25, 2020 Report Posted June 25, 2020 Me & my IA did mine, I seem to remember flying and setting MP to 12", then measuring how far the throttle was out. Once on the ground the throttle was set to the measurement and the switch adjusted to be in the detent on the cable. He might have used a VOM to see the switch activate...He's young, skinny and flexible, the seat were left in the plane and he snaked his way under there, my job was to fly and then hand him tools Quote
R-Banger Posted June 25, 2020 Author Report Posted June 25, 2020 Rock and roll guys, will shoot for 12-13 inches. Appreciate it. Quote
ManGar Posted January 30, 2022 Report Posted January 30, 2022 Hi everyone, I'm having a similar problem but there is no more adjustment that can be made to the switch. I started having the gear horn come on at 21 inches of manifold pressure recently. Before that it wouldn't sound until about 13 inches. I don't know what to do so any suggestions would be appreciated. Thanks! 20220130_182847_986758146521288.mp4 Quote
EricJ Posted January 31, 2022 Report Posted January 31, 2022 30 minutes ago, ManGar said: Hi everyone, I'm having a similar problem but there is no more adjustment that can be made to the switch. I started having the gear horn come on at 21 inches of manifold pressure recently. Before that it wouldn't sound until about 13 inches. I don't know what to do so any suggestions would be appreciated. Thanks! 20220130_182847_986758146521288.mp4 Is your throttle rigged properly with about 1/8" "cushion" on both ends of travel? That seems like a lot of difference to not be able to adjust out. Quote
carusoam Posted January 31, 2022 Report Posted January 31, 2022 Great video Mangar! Check the control cable to make sure it’s rigged properly… The Outer case is showing a lot of threads The problem with old cables… they start to fall apart… The cable itself looks like it may have been adjusted in the past… Check the logs… find out how old the controls are… (easy first step) Check to see what the other end of the cable looks like… See what has been changed… any parts of the cable replaced? Control cables get pro-actively swapped out every 2k hours or so…. If your have 5k hours on them…. It may be time for a replacement…. Inviting @M20Doc to see (MP control cable, position sensor adjustment… ran out of adjustment) PP thoughts only, not a mechanic… -a- 1 Quote
PT20J Posted January 31, 2022 Report Posted January 31, 2022 Try adjusting the switch so that it closes when hitting the first part of the swage rather than the later step. 1 Quote
Guest Posted January 31, 2022 Report Posted January 31, 2022 11 hours ago, ManGar said: Hi everyone, I'm having a similar problem but there is no more adjustment that can be made to the switch. I started having the gear horn come on at 21 inches of manifold pressure recently. Before that it wouldn't sound until about 13 inches. I don't know what to do so any suggestions would be appreciated. Thanks! 20220130_182847_986758146521288.mp4 I believe that your throttle cable is broken/slipping. In your video as you pulled the throttle closed, the coil wound outer cable slides back into view, I don’t think it should be moving at all. Clarence Quote
ManGar Posted January 31, 2022 Report Posted January 31, 2022 Thank you everyone for your inputs. I think I'm going to go ahead and have it replaced. I can't find any entry in the logs indicating that it was ever replaced and the airframe has 3,600 hours so it's time anyway. Thanks again! 2 Quote
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