HDX Autopilot Servo Installation & Maintenance Manual - Piper PA-34 Seneca Series, Rev A
• Cable clamps are located at the dimensions shown in Figure 21.
• Cable clamps are positioned to best avoid contacting any structures.
12. Tighten aft cable clamp fasteners.
13. Push or pull forward cable clamps outboard, applying 12-15 lbs. of tension to bridle cable.
14. Tighten forward cable clamp fasteners to maintain tension.
15. Torque all cable clamp fasteners to 35-40 in-lbs.
16. Using a feeler gauge, measure gap between clamp halves (top and bottom) of each clamp
assembly. Make sure gaps meet the following criteria:
• Top and bottom clamp gap measurements are close (i.e., clamps halves are close to
parallel to one another).
• Clamp gap measurements are not less than 0.003".
If clamp gap measurements do not meet criteria above, measure diameter of
control cable, and then contact Dynon Technical Support for a resolution.
Out-of-specification clamps can slip under load, causing the bridle cable to
loosen and come off the capstan.
To check the bridle cable installation:
1. Remove device securing flight controls in neutral position.
2. Remove tape temporarily securing the bridle cable to capstan.
3. While moving control through its full range of motion, verify the following:
• Cable clamps do not contact any structures during entire travel.
• Capstan never rotates more than 150 degrees in either direction from neutral.
4. Cycle control several times, return it to neutral, and verify the following:
• Position of cable clamps closely match dimensions shown in Figure 19.
• Capstan swage engagement hole is positioned as shown in Figure 23.
• The bridle cable tension has not changed.
When all autopilot servos have been installed, perform the Servo Calibration
procedure. (See Section 7.3 for instructions.) The autopilot system will not function
until calibration is performed.
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