Smokin_Joe Posted May 29, 2017 Report Share Posted May 29, 2017 Has anyone had a stuck MAP vernier before and if they did, how did they deal with it?The vernier in my 231 jammed on Sunday for 30 minutes, right after levelling off at top of climb at F130 and throttling back.I could depress the button on the vernier knob but only rotate the knob about 1/2 a turn. I couldn't push the knob in or pull it out at all. The resistance in the vernier knob to rotation increased as though I was winding the cable up with the other end jammed. Not knowing what may happen if I broke the connection at the other end of the MAP cable, I didn't try to force it.After fiddling with it for half an hour, it eventually freed up.The MAP was stuck at 27 to 29" so I was able to set RPM and fuel flow to suit so the engine ran OK, but I didn't fancy my chances of landing with 27" of MAP.My plan, had the knob remained stuck, was to kill the engine at 1000' and land dead stick, with help waiting to tow me back to the shop.I had flown through some light icing on climb but it had melted off the windscreen and wings once clear of cloud.Any comments would be appreciated. Quote Link to comment Share on other sites More sharing options...
gsengle Posted May 29, 2017 Report Share Posted May 29, 2017 I assume that's the throttle?Sent from my iPhone using Tapatalk Quote Link to comment Share on other sites More sharing options...
Guest Posted May 29, 2017 Report Share Posted May 29, 2017 I would not fly the plane until the throttle cable is replaced, a broken cable can become a fatal issue. Clarence Quote Link to comment Share on other sites More sharing options...
DVA Posted May 29, 2017 Report Share Posted May 29, 2017 People often forget that the mixture knob is a perfect secondary source of power control. I would first use that to get my power down to an approach-flyable level and would only cut power by the mags in a much more dire set of straits. You can practice this easily. Quote Link to comment Share on other sites More sharing options...
Smokin_Joe Posted May 29, 2017 Author Report Share Posted May 29, 2017 It was the throttle I will see what the engine does with 27", 1800 RPM and mixture back to where it just keeps running. I had read that cutting power with mags ran the risk of interesting backfires when restarting. I had planned to kill the engine with mixture if I had to. Quote Link to comment Share on other sites More sharing options...
gsengle Posted May 29, 2017 Report Share Posted May 29, 2017 It was the throttle I will see what the engine does with 27", 1800 RPM and mixture back to where it just keeps running. I had read that cutting power with mags ran the risk of interesting backfires when restarting. I had planned to kill the engine with mixture if I had to. Remember it's not just on/off with the mixture, using the vernier mixture LOP you control power too, you can if careful cut the power a good way before you get cut off.Sent from my iPhone using Tapatalk Quote Link to comment Share on other sites More sharing options...
carusoam Posted May 29, 2017 Report Share Posted May 29, 2017 There are probably a couple of ways a throttle cable can stick. You might find them during the process of replacing the cable... throttle, prop rpm and mixture controls are easy, but a bit pricey to replace. None of them are OK to have stuck... Our control cable source around here comes in two varieties... Mooney supplies them through the MSC network. And McFarlane is the cable builder. There are a few references around here related to owner supplied parts, and McFarlane makes it quite reliably simple... Plan on getting a new one, the old one just lost your trust... We have a few control cable failures around here. The most recent one was the button not pushing in properly. It's spring broke, replacing the spring was easy from the cockpit with some tools and a new spring... PP ideas only. Not a mechanic. Best regards, -a- Quote Link to comment Share on other sites More sharing options...
Guest Posted May 30, 2017 Report Share Posted May 30, 2017 Being in Australia shipping back and forth to the U.S. May not be practical, a new one from Mooney may be the simplest solution. Clarence Quote Link to comment Share on other sites More sharing options...
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