Joined: 08 Nov 2005
Location: Livermore CA USA
|Posted: Sun Apr 17, 2011 2:25 pm Post subject: "Worn Out" CT-Q67 Cable Assembly (Warning!)
At 170 hours on my RV-8 now, the Prop control had become increasing more difficult to move starting around 100 hours. The Mixture and Throttle have worked fine and continue to. All three controls use the standard "Green" control cables from Vans, typically a "CT-Qxx" part.
A couple of weeks ago, I disassembled the Governor end of the assembly and made sure that there was no binding or issues on that end. I even lightly lubed up the various moving bits. Yesterday, the Prop control became so difficult to move that I had trouble cycling the prop during run up. I pulled the whole throttle quadrant installation apart today to have a look. I got the cable completely out of the airplane and there are NO outward signs of wear or abuse of *any kind*. But even with the cable completely out of the plane and nothing connected to either end, it is almost impossible to move the cable!! I have a new CT-Q67 cable assembly for my front-mounted governor installation and I'm going to install that next.
But, I wanted to give everyone a heads up on these CT-Q controls. These things are built like they go on a Caterpillar Tractor, so I can't figure out why they would wear out like this.
If one of these controls starts getting stiff and tight, its probably not going to get any better. Replace it before it becomes a safety issue! Not a big deal on the Prop control, but on a throttle or mixture it could be a serious concern.
RV-8 #82880 N998RV
http://www.mattsrv8.com - Matt's RV-8 Construction Blog
http://www.youtube.com/MattsRV8 - Matt's RV-8 HDTV YouTube Channel
Status: 170+ Hours Total Time Since May 2 2010 Test Flight!
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