Piper COMANCHE PA-24-180 Service Manual page 171

PIPER COMANCHE SERVICE MANUAL
5-38. Imnalldon Of Sabilator Trim Medehisru . (Refer to Figure 5-10.)
a To insall the sbilator trim mechanism. aemble the drm assembly (10) onto its support
brackets Attach the bellcrnk (34) to the bearing blocks and safety. Drw the rim cables (2) into the
fuseage, allowng them not to cros. and insll the cable pulleys
b. The forward im cable may be insalled by drawing the cable to the location of the rim crank
pulley (1) and idler pulley. Wrap the cable around the crank pulley, then to the idler pulley and back to the
crank pulley. Continue the cable to the aft secon and instll cable puleys that were removed.
c. To rig and adjust the trim mechanism and cables, refer to Paragraph 5-39.
5-39. Riging And Adjutment Of Stbilator Trim Mechanism.
a. To rig the stabilator trim syaem. draw the trim cable, rotating the cable drum until approximately
7 wraps (PA-24-180, PA-24-250 and PA-24-260) or 8 wraps (PA-24400) remain on the drum of the top
series of wraps.
b. Within the fuselage, draw the forward rim cable fore or aft and connect the urnbuckles. Should it
be necesuarv o swage a cable end before connecting the remaining turnbuckle, assemble the eye, thimble
and sleeve. Connect the ends to the barrel with three or four threads. Draw the free cable end until it is
tight. clamp the cable so that it will not damage the cable or slip back. Crank the trim a few times to seat
the cable on the drum and pulleys. Again draw the free end of the cable to approximately the required
cable tennon (refer to Table V-), swage the sleeve to the able and reset the cable tension. Cut off the
remaining cable.
c. Without turning the trim drum, roate the trim screw until .285 (PA-24-180, PA-24-250 and
PA-24-260) or .210 inch (PA-24-00) exist between top of the drum housing and bottom of the upper
screw stop. (Refer to Figure 5-10.) The trim drum and screw are in neutral position. Connect trim screw
and bellcrank.
d. Level stabilaor as described in Paragraph 5-35. Adjust the stabilator tab arm so that the trailing
edges of stabilator tab and stabilator align. Ascertain that there is one cable wrap remaining and there is no
binding of cables or turnbuckles when the trim is moved through its full travel. Readjust if necessrr bv
reseting the trim screw and drum.
e. Reset the stabilator and tab at neutral and adjust the trim indicator within the fuselage to read
neutral by setting the wire at the rear of the fuselage.
CAUTION
Upon completion of all installtions and adjustments, before any flight
tests, check that all controls are hooked up and rigged properly,
rurnbuckles, bolts, etc. are safetied, and panels and plates are secured.
f. If the stabilaor tab is not aligned with the neutral stabilator, disconnect the stabilaror tab actuator
rod (35) from the bellcrank (34) by removing the cotter pin. casrellated nut, washer and bolt. Loosen jam
nut and rorate rod end bearing (33) until the mm tab and stabilator are aligned when the rod end bearing is
in place.
SURFACE CONTROLS
ISSUED: 8/18/72
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