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Found 2 results

  1. I am having problems with my Century IIB (single axis) autopilot. It works well in HDG mode. When I switch the radio coupler to any of the NAV modes the autopilot initiates an immediate right turn even with the CDI deflected left. Has anyone else had this problem? I was reviewing the ground/flight calibration procedure in the Century II&III manual (pages attached). I can understand the instructions all of the way through except in one area. It seems there is a step missing around paragraph (10) of page 6-5. I would think the radio coupler would need to be in one of the NAV positions (probably OMNI). It appears from the procedures that the radio coupler is in HDG mode at this point and I believe it would just be tracking heading and the left deflected CDI wouldn't have any effect on the heading computation of the autopilot. Am I correct in thinking that the procedure should include OMNI (or some other NAV) mode at this point? If there is anyone that has experience with the Century IIB calibration, I would welcome your input. Anyone else that would have any ideas, I would welcome those also.
  2. So, on an IFR training flight last week my instructor noted a large (~30-deg.) discrepancy between the two VOR receivers in my aircraft. The next flight we went to KMEI where there is a VOR test point on the field, and saw that the NAV receiver in the GNS430W is about 30-degrees off. The other NAV rcvr in the KX-155 is within two degrees (yeah!). Yesterday I called a nearby avionics shop and discussed with a technician I know, who told me that the GNS430W probably required calibration of the CDI it is attached to, and told me something to try. I went to the hangar, followed his instructions, which took about 5 minutes, and then went for a test flight. Both NAV receivers now agree within 1 degree of each other! Solution: press and hold "Enter" while powering up the GNS 430W. That boots it into calibration mode. About 8 or 10 pages into the calibration mode is an option to "Calibrate 150 degrees CDI". Set the CDI to 150 degrees "TO", highlight the box that says "Calibrate 150 degrees CDI" and press enter. That's it. Not sure why it was off, but it is fine now. It should all be that easy!
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