Piper Aircraft Corporation Cherokee 140 PA-28-140, Service Manual

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PIPER CHEROKEE SERVICE MANUAL
01/31/08 V - SURFACE CONTROLS
2B7
5-17. 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. Level the airplane. (Refer to Leveling, Section II.)
b. To check and set the correct degree of stabilator travel, the following procedure may be used:
1. Check the stabilator travel by placing a rigging tool on the upper surface of the stabilator as
shown in Figure 5-7. (This tool may be fabricated from dimensions given in Figure 5-7.)
2. Set on a bubble protractor the number of degree up travel as given in Table V-II and place it on
the rigging tool. Raise the trailing edge of the stabilator and determine that when the stabilator
contacts its stops, the bubble of the protractor is centered.
NOTE: The stabilator should contact both of its stops before the control wheel contacts its
stops. The neutral position of the stabilator is with the stabilator chord line parallel
with the top of the front seat tracks.
3. Set on the protractor the number of degrees down travel as given in Table V-II and again place
it on the rigging tool. Lower the trailing edge of the stabilator and determine that when it
contacts its stops, the bubble of the pro-tractor is centered.
4. Should the stabilator travel be incorrect in either the up or down position, remove the tail cone
fairing by removing the attaching screws and with the use of the rigging tool and bubble
protractor turn the stops located at each stabilator hinge in or out (Refer to Figure 5-14) to
obtain the correct degree of travel
5. Ascertain that the lock nuts of the stop screws are secure and reinstall the tail cone fairing.
c. To check and set stabilator control cable tension, the following procedure may be used:
1. Ascertain that the stabilator travel is correct.
2. Remove the access panel to the aft section of the fuselage.
3. Secure the control column in the near forward position. Allow one-quarter inch between the
column and the stop bumper
4. Check each control cable for the correct tension as given in Table V-II.
5. Should tension be incorrect, loosen the turnbuckle of the lower cable in the aft section of the
fuselage and adjust the turnbuckle of the upper cable to obtain correct tension. Cable tension
should be obtained with the control wheel at the one-quarter inch dimension from the stop and
the stabilator contacting its stop.
6. Check safety of all turnbuckles and bolts.
7. With the tension of the upper, cable correct and the control wheel still forward, adjust the
turnbuckle of the lower cable to obtain correct tension.