Mleahy Posted December 18 Report Posted December 18 Does anyone know where to get the Duke’s actuator rebuilt? I have a 67 M20F?
201Steve Posted December 18 Report Posted December 18 LASAR will IRAN it. Not sure what limitations they have but they’ll service it 1
N201MKTurbo Posted December 18 Report Posted December 18 13 hours ago, Mleahy said: Does anyone know where to get the Duke’s actuator rebuilt? I have a 67 M20F? What is wrong with it? 2
N201MKTurbo Posted December 18 Report Posted December 18 37 minutes ago, Mleahy said: Dynamic brake not working I don’t recall it having one. 1
PT20J Posted December 18 Report Posted December 18 2 hours ago, Mleahy said: Dynamic brake not working Can you provide more detail about the symptoms you are experiencing? There are people here with a lot of experience with these actuators.
Andy95W Posted December 18 Report Posted December 18 (edited) My ‘67 M20C had an issue where the landing gear preloads were being released by the Dukes motor. It is supposed to prevent rotation of the motor shaft. Mine was releasing slightly when the gear was down, and also my gear was sagging slightly when it was retracted. It usually wasn’t enough to break contact on the up or down limit switch. It’s not really a dynamic brake but more like a clutch that holds the motor shaft stationary. I took it down to Ronnie at Dugosh (this was 30 years ago) and he disassembled the Dukes motor and installed two standard -10 washers, one on each post. The problem he said was that the springs that hold that clutch stationary get weak over time. The -10 washers are used as shims to increase the spring pressure. Ronnie was sure to explain that this is only a temporary fix, the springs need to get replaced. Also: these memories are 30 years old and two airplanes ago and before I got my A&P license. Edited December 18 by Andy95W 1
Mleahy Posted December 18 Author Report Posted December 18 This sounds like my problem. The gear goes up then comes back down off the switch making go up again. 2-3 times before staying up.
Mleahy Posted December 18 Author Report Posted December 18 4 hours ago, N201MKTurbo said: I don’t recall it having one. I may have wrong terminology. It’s the break in the actuator. The gear comes off the up limit switch a couple of times before staying up.
Andy95W Posted December 18 Report Posted December 18 I’d call Don Maxwell’s shop first and describe the problem. They’ve been around long enough to have probably dealt with this before. After that, I’d call LASAR. The good news is that it’s not a huge issue. When you send it out, you may as well have them do the work required by the Dukes gear AD and restart the clock on that as well (unless it was just done very recently.) 1
N201MKTurbo Posted December 18 Report Posted December 18 I have worked on motors with such a brake, I wasn’t aware that the Dukes actuator had that. It seems that it would make manual extension difficult. I have never disassembled a Dukes motor. 1
N201MKTurbo Posted December 18 Report Posted December 18 It seems the ITT actuator and some of the old Dukes actuators had brakes. They have 4 wires. The newer Dukes actuators only have 2 wires. SB-M20-189A says only the ITT has a brake. 1 1
N201MKTurbo Posted December 18 Report Posted December 18 Is it possible that you have the gear rigged so it is over stressing the gear when it is raised? That could cause it to spring back. 1
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