B. Install the Pitch Trim Servo Clutch
Detail Steps/Work Items Key Items/References
(1) Put the clutch and the chain adjuster in place on the mounting plate.
(2) Install the 2 screws which attach the clutch and the chain adjuster to the mounting plate.
(3) Install the chain to the chain gear.
(4) Put the cap in place on the capstan.
(5) Install the screw which holds the cap to the capstan.
(6) Install the pitch trim servo. Refer to Paragraph 7.
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9. Adjust the Bridle Cable Tension
A. Equipment
Item Quantity Part Number
Cable tension gauge. 1 Commercial.
B. Adjustment Procedure
Detail Steps/Work Items Key Items/References
(1) Loosen the bolts in the clamps which connect the bridle cable to the push-rod. Do not remove the bolts. Loosen just enough so that the next step can be done.
(2) Using a small plastic hammer, move the clamps along the push-rod to adjust the bridle cable tension. Adjust tension to 89 ± 22 N (20 ± 5 lb). Measure cable tension with cable tension gauge.
(3) Tighten the bolts in the clamps which connect the bridle cable to the push-rod.
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10. Adjust the Clutch Torques
A. Equipment
Item Quantity Part Number
Goodrich Slip Clutch Test Stand. 1 20-9855-03
B. Adjustment Procedure
Detail Steps/Work Items Key Items/References
(1) Remove the clutch from the airplane. Refer to this Section.
(2) Install the clutch assembly on the slip clutch test stand. Refer to the equipment manufacturers' documentation.
(3) Measure clockwise (CW) and counter-clockwise (CCW) clutch torque, adjust if necessary. Refer to the equipment manufacturers' documentation. The correct clutch torques are: Roll servo 3.39 ± 0.34 Nm (30 ± 3 in.lb) Pitch servo 2.03 ± 0.23 Nm (18 ± 2 in.lb) Pitch trim servo 4.07 ± 0.45 Nm (36 ± 4 in.lb)
(4) Remove the clutch assembly from the slip clutch test stand.
(5) Install the clutch to the airplane. Refer to this Section.
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11. Mechanical Check of the Autopilot System
Do this check at the intervals given in Section 05-10.
Detail Steps/Work Items Key Items/References
(1) Check bridle cable tension for the roll servo, adjust if necessary. Refer to this Section.
(2) Check bridle cable tension for the pitch servo, adjust if necessary. Refer to this Section.
(3) Check the clutch torque settings for the roll servo, adjust if necessary. Refer to this Section.
(4) Check the clutch torque settings for the pitch servo, adjust if necessary. Refer to this Section.
(5) Check the clutch torque settings for the pitch trim servo, adjust if necessary. Refer to this Section.
(6) Perform Pitot and static system leak tests. Refer to Section 34-10.
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