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

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PIPER CHEROKEE SERVICE MANUAL
V - SURFACE CONTROLS 01/31/08
2A24
5-12. RIGGING AND ADJUSTMENT OF AILERON CONTROLS. (Refer to Figures 5-4 and 5-5.)
CAUTION: VERIFY FREE AND CORRECT MOVEMENT OF AILERONS. 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 AILERON RIGGING AND ADJUSTMENT, VERIFY THAT
THE RIGHT AILERON MOVES UP AND THE LEFT AILERON MOVES DOWN
WHEN THE CONTROL WHEEL IS TURNED RIGHT; AND THAT THE LEFT
AILERON MOVES UP AND THE RIGHT AILERON MOVES DOWN WHEN THE
CONTROL WHEEL IS TURNED LEFT.
NOTE: Flap rigging and adjustment must be completed before starting aileron rigging and adjustment.
a. To check and adjust the rigging of the aileron controls, first set the right and left aileron bellcranks
at neutral position. (Ascertain that the control chains have been rigged per paragraph 5-6.) This may
be accomplished by the following procedure:
1. Place tee bar in full forward position. Maintain in this position by use of a suitable tool or by
placing weights on aft side of stabilator if stabilator cables have been previously tensioned.
2. Remove the access plate to each aileron bellcrank located on the underside of the wing.
forward of the inboard end of the aileron by removing the plate attaching screws.
3. Affix a bellcrank rigging tool, as shown in Figure 5-4, between the forward arm of each
bellcrank and the adjacent rib. (This tool may be fabricated to dimensions given in Figure 5-4.)
The slotted end of the tool fits on the arm forward of. and adjacent to, the primary control cable
end. The other end of the tool is positioned so that the side of the tool contacts the aft side of the
bellcrank stop. The bellcrank must be moved to allow a snug fit of the tool between the
bellcrank arm and rib. To do so. it may be necessary to loosen a primary control cable or the
balance cable. Neutral position of the bellcranks may also be found by locating the centers of
the forward and aft cable connection holes an equal distance from the adjacent inboard wing rib.
b. With each bellcrank set at neutral, the ailerons on the PA-28-140, -150, -160, -180, -235 and 28R
may be checked and adjusted for neutral as follows:
1. Ascertain that the bellcrank rigging tool fits snug between the bellcrank and the rib.
2. Place an aileron rigging tool as shown in Figure 5-5 against the underside of the wing and
aileron as close as possible to the inboard end of the aileron without contacting any rivets. The
tool must be positioned paralleled with the wing ribs, with the aft end of the tool, even with the
trailing edge of the aileron. (This tool may be fabricated to dimensions given in Figure 5-5.)
3. With the aileron control rod connected between the bellcrank and aileron, check that the
surface of the wing contacts the tool at its forward surface and at the spacer, and the trailing
edge of the flap contacts the aft end of the tool. The aileron is neutral at this position.
4. Should the three points not contact, loosen the jam nut at the aft end of the control rod and
rotate the rod until the three points contact. Apply a slight up pressure against the trailing edge
of the aileron while making this adjustment. After adjustment, retighten the jam nut.
c. Adjust primary and balance cable tension as given in Table V-II by the following procedure:
1. Remove the two front seats, if desired, and the baggage area floor panel of the PA-28-140
airplanes or the bottom of the rear seat of the PA-28-150, -160, -180; PA-28-235 and PA-28R
airplanes to facilitate in the necessary operation.