Piper PA-24 Comanche, Service Manual

Page: 285 / 846

PIPER COMANCHE SERVICE MANUAL
04/01/09 V - SURFACE CONTROLS
1H1
B. For the removal of the forward control cable, relieve cable tension and disconnect the two
turnbuckles (5) located to the rear of the fuselage near the radio rack. The upper turnbuckle ends
should be marked to facilitate reinstallation. Remove the control cable guards or pulleys (1) along
the bottom of the fuselage. Draw the cable forward from beneath the floor panel. At the pulley
cluster located at the firewall, remove two cable guards and bring the cable around the pulley
cluster. Remove the pulleys (44) behind the instrument panel, disconnect the cable from the control
column and remove the cable.
C. The aft stabilator control cables may be removed by disconnecting the cables at the stabilator
balance (29) and removing the cable pulleys.
D. To remove the stabilator torque tube assembly, remove the tail cone fairings, stabilator (refer to
paragraph 4-15 of Section IV) and stabilator trim mechanism. (Refer to Paragraph 5-37.)
Disconnect the cables from the balance arm. Remove the nuts securing the bearing blocks and
remove the assembly. Should the bearings be removed from the torque tube, note the number of
shims, if any, between bearing and tube collar.
5-34.
Installation of Stabilator Controls.
(Refer to Figure 5-14.)
A. Should it have been necessary to remove the bearing blocks from the torque tube, check that there is
a dimension of 8.620 inches from center of the right bearing block to center of the left bearing
block. Maintain this dimension by placing the necessary shims between the bearing and tube collar.
Insert the balance arm into the fuselage and slide the bearing blocks into position. Install the
mechanism brackets and secure torque tube assembly.
B. The trim mechanism may be installed, referring to paragraph 5-38 and the stabilator surfaces
referring to paragraph 4-35 of Section IV. Before connecting any control cable, check for proper
balance of the stabilator. (Refer to Section IV.)
C. To install the forward control cable (43), commence by measuring from the thimble of the cable end
(not identified by paint), approximately 151 inches to the swagged ball at this point. This ball will
connect to the left control column bearing. The swagged ball that is approximately 178 inches from
the thimble of the cable end (identified by paint) will connect to the right control column bearing.
String the cable as shown in Figure 5-14, secure the swagged balls and pulleys (44). Draw the cable
ends down around the pulley cluster, beneath the floor panel and to the aft section of the aircraft.
Install the remaining cable guards or pulleys (5).
CAUTION: WHEN STRINGING THE CABLES ON THE FRONT PULLEY CLUSTER JUST
AFT OF FIREWALL, BE SURE TO THREAD CABLE IN THE PULLEY GROOVE
AND NOT OVER TOP OF EITHER THE FRONT OR BOTTOM CABLE GUARDS.
(REFER TO VIEW A-A OF FIGURE 5-14.)
D. The aft stabilator control cables may be connected to the stabilator balance. On the PA-24-180, PA-
24-250 and PA-24-260, the cable with thimble end goes over the upper pulley and the cable with the
swagged ball and forked fitting goes to the bottom. On the PA-24-400 the shorter of the two similar
cables go over the upper pulley. Connect the aft control cables to the forward cable. Match the
painted ends. Connect the stabilator extension spring (31) and cable.
E. For the rigging and adjustment of the stabilator controls, refer to Paragraph 5-35.