Piper Comanche PA-24 Service Manual page 292

B. Within the fuselage, draw the forward trim cable fore or aft and connect the turnbuckles. Should it
be necessary to 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 tension (refer to Table V-I), swage the sleeve to the cable and reset
the cable tension. Cut off the remaining cable.
C. Without turning the trim drum, rotate the trim screw until .285 (PA-24-180, PA-24-250 and PA-24-
260) or .210 inch (PA-24-400) exist between top of the drum housing and bottom of the upper
screw stop. (Refer to Figure 5-14.) The trim drum and screw are in neutral position. Connect trim
screw and bellcrank.
D. Level stabilator 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 necessary by resetting 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 INSTALLATIONS AND ADJUSTMENTS,
BEFORE ANY FLIGHT TESTS, CHECK THAT ALL CONTROLS ARE HOOKED
UP AND RIGGED PROPERLY, TURNBUCKLES, BOLTS, ETC. ARE SAFETIED,
AND PANELS AND PLATES ARE SECURED.
F. If the stabilator tab is not aligned with the neutral stabilator, disconnect the stabilator tab actuator
rod (35) from the bellcrank (34) by removing the cotter pin, castellated nut, washer and bolt.
Loosen jam nut and rotate rod end bearing (33) until the trim tab and stabilator are aligned when the
rod end bearing is in place.
NOTE: The stabilator trim control rod end bearing located at the forward end of the control rod
(33) should be checked for freedom of movement during the regular 100 hour inspection.
Disconnect the rod at the trim tab and hold the end between your fingers. Try to turn the
rod from side to side and rotate up and down. If the rod will not turn or is hard to turn, the
bearing should be checked more thoroughly by removing the complete assembly (33) from
the airplane.
G. Connect the tab actuator arm to the bellcrank at the rod end bearing with bolt, washer, castellated
nut and cotter pin. With the stabilator in the neutral position, turn the trim in each direction to screw
stops to check tab angle as given in Table V-I and also check minimum number of wraps left on the
drum. (Minimum allowable is one and one quarter (1.25) turns.
V - SURFACE CONTROLS
PIPER COMANCHE SERVICE MANUAL
1H4D
04/01/09