Piper Comanche PA-24 Service Manual page 286

5-35. Rigging and Adjustment of Stabilator Controls.
CAUTION: VERIFY FREE AND CORRECT MOVEMENT OF STABILATOR. WHILE IT WOULD
SEEM SELF-EVIDENT, FIELD EXPERIENCE HAS SHOWN THAT THIS CHECK IS
FREQUENTLY MISINTERPRETED OR NOT PERFORMED AT ALL. ACCORDINGLY,
UPON COMPLETION OF STABILATOR RIGGING AND ADJUSTMENT, VERIFY
THAT THE REAR EDGE OF THE STABILATOR MOVES UP WHEN THE WHEEL IS
PULLED BACK; AND, THAT THE REAR EDGE OF THE STABILATOR MOVES
DOWN WHEN THE WHEEL IS PUSHED FORWARD.
A. To adjust the stabilator controls, first ascertain that the stabilator is properly balanced (Refer to
Section IV.)
B. With the aircraft level, determine the level position of the stabilator by use of a bubble protractor on
a special leveling tool placed on the stabilator per dimensions in Figure 5-15. The leveling tool may
be fabricated per dimensions given in Figure 5-17. Set the stabilator travel by adjusting the stop
bolts at the torque tube horn (refer to Figure 5-16) and measuring the degree of travel with the
bubble protractor on the leveling tool. Travel dimensions from level are given in Table V-I.
C. To set stabilator control cable tension. place the control wheel in neutral position. Measure from the
instrument panel along the under side of the control column to the control wheel. Refer to Table V-I
for appropriate dimensions and cable tensions to obtain the stabilator neutral position.
NOTE: Stabilator should hit stabilator stop bolts before control wheel shaft in cockpit hits stops.
D. Adjust link at stabilator control extension spring to obtain .125 inch slack in cable with stabilator
stops adjusted and control wheel in full forward position.
5-36. Stabilator Trim Controls.
5-37. Removal of Stabilator Trim Mechanism. (Refer to Figure 5-14 )
A. To remove the trim mechanism or control cable, tension must be relieved from the control cables.
Rotate the turnbuckle barrels (5) located in the aft section of the fuselage
B. The forward trim cable may be removed by lowering the overhead light panel, gaining access to the
forward most pulleys (1). Disconnect the cable at the turnbuckles. If the cable need not be reused,
cut one end of the forward cable (2) and butt the new cable to it, solder the cables together and
smooth the joint. Should it be necessary to reuse the old cable with the thimble, etc., attached,
remove the trim crank and idler pulleys. Lower the headlining and remove the necessary cable
guards to facilitate removal of the cable through the bulkheads. Withdraw the cable from its
position.
C. The trim mechanism with the aft trim cable may be removed by disconnecting the trim tab actuating
arm, removing the cable guards at the pulleys and disconnecting the trim indicator wire. Disconnect
the tab bellcrank assembly and the unit at the support bracket.
V - SURFACE CONTROLS
PIPER COMANCHE SERVICE MANUAL
1H2
04/01/09