Stabilator Trim And Flap Interconnect System - Piper APACHE PA-23-235 Service Manual

PIPER AZTEC SERVICE MANUAL
5-56. STABILATOR
TRIM AND FLAP INTERCONNECT SYSTEM. (Serial Nos.
27-7654001 and up.) On PA-23-250 (six place) airplanes with serial nos. noted above, a
stabilator trim and flap interconnect system is installed which connects the flap torque tube to
the stabilator trim tab. The system includes cables connecting a pulley on the flap torque tube
to an eccentric pulley on the stabilator trim bellcrank, so that when the flaps are extended,
pressure is exerted against the bellcrank to increase down trim. Thus reducing the pitch change
during flap extension. The amount of trim tab displacement is directly proportional to the
amount of flap extension.
5-57. REMOVAL
OF STABILATOR TRIM AND FLAP INTERCONNECT SYS-
TEM. (Refer to Figure 5-6.)
a. Remove center seats and rails. Pull the carpet back to gain access to the stabilator
trim and flap interconnect access cover at station 126.75. Remove aft baggage compartment
trim and floor panels by removing attaching screws. Remove the tail cone fairing.
b. Disconnect the turnbuckles (7 & 8) at stations 258.50 and 267.50.
c. Remove guard pins from pulleys at stations 130.75, 153.88 and 229.00; pull cable (9)
forward through fuselage to flap torque tube (12).
d. Remove guard from around flap torque tube pulley; unwind cable from pulley. Re-
move cotter pins securing cable to torque tube pulley and remove cable from airplane.
e. Remove flap torque tube pulley (1) per paragraph 5-50.
f.
Pull guard pin from pulley at station 273.38 and pull remaining cable (10) aft to the
stabilator trim bellcrank assembly (17).
g. Disconnect eccentric pulley (6) and remove cable and eccentric pulley from aircraft.
5-58. INSTALLATION OF STABILATOR TRIM AND FLAP INTERCONNECT SYS-
TEM.
a. Install pulley on torque tube per paragraph 5-51.
b. Hold cable ball in place on flap torque tube pulley with cotter pins.
c. Wrap cable around pulley as shown in Figure 5-6, Sketch B and install pulley guard.
d. Feed cable aft through pulleys at stations 130.75, 153.88 and 229.00 and install
guard pins.
e. Slide cable ball on eccentric pulley and wrap cable as shown in Figure 5-6, Sketch C.
Install eccentric pulley on bellcrank and screw assembly.
f.
Connect tension spring (25) as shown in Figure 5-6.
g. Feed cable forward to the turnbuckles. Install pulley guard pin at station 273.38.
Connect the cable end from the bottom of the flap torque tube pulley to the cable from the
top of the eccentric pulley. (Refer to Figure 5-6, Sketches B and C.) Connect the other cables
and adjust tension per paragraph 5-59.
h. Replace items removed in Step a of paragraph 5-57.
SURFACE CONTROLS
Reissued: 2/18/81
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