Yourpilotincommand Posted December 9, 2020 Report Posted December 9, 2020 Different problem and thread than the 67F guy. Just after takeoff the gear came up half way and completely stopped. It didn’t pop a breaker. I pushed the nose forward to gain airspeed to 120mph and still didn’t go up. I put the gear switch down and up a couple of times to no avail. I had to manually crank down the gear. once I got the gear down, the green light illuminated and the floor indicator showed good. I noticed on a previous flight it seemed a little slow coming up. I’ll first look for broken or loose wires. Wondering if I should suspect the up/down switch, airspeed pressure switch, or motor? Thanks, Chris Quote
carusoam Posted December 9, 2020 Report Posted December 9, 2020 All things related to delivering electricity to the gear motor are suspects.... Airspeed increases... generally help pull the gear down... Looks like it may be time to put the plane up on jacks and find out where the electricity stops flowing... PP thoughts only, not a mechanic... Best regards, -a- 1 Quote
Yourpilotincommand Posted December 9, 2020 Author Report Posted December 9, 2020 Thanks for the wisdom. I’m hoping for more technical info... possibly a common problem, things that are not obvious, troubleshoot methods (check this first, second, etc..). I have the electrical schematic in front of me. Possible the relays are a common failure point, a ground wire somewhere.. possibly the up/down switch is a common problem. Quote
MBDiagMan Posted December 10, 2020 Report Posted December 10, 2020 Did you try resetting the breaker, pulling it off and then pushing on again? I’m with carusoam. It’s time to get it on jacks. If you don’t have a set, borrow, build or buy. You need to have the ability to raise the plane to swing the gear. Access to the actuator is by removing the panel directly under the gear window. It will also give access to the gear relays. They are very rebuildable. You can pull out the plungers and see if the contacts are dirty. I really believe you will have to electrically troubleshoot the system. The service manual is available in the Downloads section and the wiring schematics and other information is included in the manual. If it were me and it was on jacks with the belly pan off, I think the first thing I would do is get a helper to actuate the airspeed switch while I measured the voltage from the switch which can be found from the schematic as to which pin on which relay to measure. I had trouble with that switch not long after getting the plane. Diaphragms are available for rebuilding it. Hope this helps. I sure miss my johnson bar C. If I hadn’t injured my shoulder I would still have it. I’m really disappointed with the electric gear problems I’ve dealt with. If it turns out to be the actuator, call Lasar about getting it fixed. Also, since you’re in McKnney, there is a shop in Mt Pleasant that helped with mine and another in Commerce although they are consumed by a major project at the moment. It sounds like you could fly it to one of them gear down. I’ve done that before. It’s a real drag! No pun intended. 2 Quote
carusoam Posted December 10, 2020 Report Posted December 10, 2020 Fortunately, or unfortunately..? With 50 year old parts... there aren’t any that stand out... as most likely to fail... The good news... you have the drawings and a volt meter... There aren’t that many parts to check... Expect a wire, or a connection may be more likely to fail than any of the components... Wires may show some worn insulation, or broken connectors from decades of vibration... Connections may show decades of oxidation on them... A visual inspection may be more fruitful than the volt meter... Use caution with all the moving parts... Mooney didn’t put any safeties in place to keep pilots from becoming one with their machines... they were expecting the pilot to be inside the cockpit... PP thoughts only, not a mechanic... Best regards, -a- 1 Quote
cliffy Posted December 10, 2020 Report Posted December 10, 2020 When was the last time the actuator was cleaned out of old grease and relubed? Ck AD 75-23-04 If its been a while and you don't find any wiring problems then you might have an actuator with worn gears and no good lube in them. The required Special lube can be bought or mixed yourself. Directions are on the MS site somewhere. Worn gears is another story. 2 Quote
Yourpilotincommand Posted December 10, 2020 Author Report Posted December 10, 2020 Cliffy this AD is stated in my logbook at the annual last May. I am going to read it. Thanks! Quote
G Miller Posted January 3, 2021 Report Posted January 3, 2021 I have had my gear fail up (limit switch) and down (gear motor was rebuilt). I preferred the gear down failure. 1 Quote
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