carl Posted September 20, 2015 Author Report Share Posted September 20, 2015 HRM, I have that button , which is usually covered by the end of a crutch, a crutch shoe, the rubber cover holds it down . I just took it off and the pc works great. I do need a new crutch shoe because it is old and dirty. I like to have the PC off for landings and take off. How do others handle landings and takeoffs ? You have a boost pump indicator light. I do not have one. That is a great idea. Shadrach Flew AOO to Hagerstown VOR and back with PC working. Didn't have much time so I did not land and look for you Ross. I will soon. 1 Quote Link to comment Share on other sites More sharing options...
carusoam Posted September 20, 2015 Report Share Posted September 20, 2015 (edited) Mooneys are always hand flown when close to the ground. The transition from A/P to hand flying also has some potential quirks that are best handled well above terrain. A modern A/P can follow an ILS close to the ground. That would require knowledge of the systems and practice to stay current. you definitely want to know how to disable the A/P reliably and know that the off switch/valve is working. best regards, -a- Edited September 20, 2015 by carusoam Quote Link to comment Share on other sites More sharing options...
MyNameIsNobody Posted September 20, 2015 Report Share Posted September 20, 2015 PC-Positive Control is NOT an Auto-Pilot. PC was/is a wing leveler designed to be "on" all the time unless defeated by pushing the button or pulling out the button to defeat the vacuum based pressure to maintain "wings level flight". When maneuvering (generally take-off and landings the PC was/is defeated by the pilot...BUT the pressure can be overcome "with PC on" with pressure on the yoke. The wing-leveler could be augmented into an altitude hold and heading or GPS auto-pilot system with additional servos in tail for elevator control. Again, this system can be overcome by pressure on yoke. The PC does NOT trim the plane. The plane must be trimmed for level flight to include the roll-trim. You absolutely CAN land a Mooney with PC on. The control forces ARE heavier. Brittain later came up with an electric solenoid to defeat the PC vs. pushing the button. It is actuated with a switch on the "newer" style yokes. Quote Link to comment Share on other sites More sharing options...
HRM Posted September 21, 2015 Report Share Posted September 21, 2015 HRM, I have that button , which is usually covered by the end of a crutch, a crutch shoe, the rubber cover holds it down . I just took it off and the pc works great. I do need a new crutch shoe because it is old and dirty. I like to have the PC off for landings and take off. How do others handle landings and takeoffs ? You have a boost pump indicator light. I do not have one. That is a great idea. Shadrach I just hold the button in, not a big deal and that is what it is for. Also,when I push the button there is a blip on my vacuum gauge. That is how I know it is working. Quote Link to comment Share on other sites More sharing options...
MyNameIsNobody Posted September 21, 2015 Report Share Posted September 21, 2015 I did not like the skinny old style yokes. I didn't like pushing the button. New style yokes were $75 bucks on Ebay. Solenoid was <$100 and installation was done during an annual. No big deal. Quote Link to comment Share on other sites More sharing options...
MyNameIsNobody Posted September 21, 2015 Report Share Posted September 21, 2015 I know it is working because it doesn't feel like I am turning a vehicle without power steering in a parking lot. Quote Link to comment Share on other sites More sharing options...
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