Piper PA-34-200T Seneca II Service Manual Download

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PIPER SENECA II SERVICE MANUAL

V - SURFACE CONTROLS

10/31/19

1G20

5-20. INSTALLATION OF STABILATOR TRIM CONTROLS (AFT)

Refer to Figure 5-5.

Identify the center of the aft stabilator trim cable. Wrap the trim barrel (24) by first laying the center
of the aft trim cable (16) in the slot of the barrel (24). Then, bring the upper cable through the
diagonal slot in the upper end flange of the barrel and wrap down as shown in Figure 5-5, Sketch
E. Bring the lower cable through the diagonal slot in the lower end flange of the barrel and wrap up
as shown in Figure 5-5, Sketch E. Wrap the cable as evenly as possible to obtain 23 wraps on the
barrel as viewed from the side opposite the slot and with the cables extending out from the slotted
side.

Block both cables by clamping them between two pieces of wood laid next to the wraps to prevent
them from unwrapping.

Install the barrel between the two parts of the bracket assembly (26). Be sure to install the washers
at both ends of the barrel before installing it in the brackets.

Secure the barrel and bracket assembly (26) to the mounting bracket (38) with the four machine screws.

Install the screw (27) into the barrel (24) with the drilled bolt hole facing toward the front of the
airplane.

Position the stabilator and trim tab in a neutral position (refer to Paragraph 5-21) and adjust the trim
screw until the bolt hole in the end aligns with the bolt hole in the yoke of the link assembly (29);
then install the bolt assembly (23) and secure.

Route the cable (16) around the pulleys at station 292.34 and forward to the turnbuckles (17) in the
fuselage.

Ascertain that the cables are in the pulley grooves; then install the guard pins (22) at the pulleys (12).

Connect the cables (16) to the turnbuckles (17) and remove the blocking from both the forward and
aft cables.

Set cable tension in accordance with Table V-I and check rigging and adjustment per paragraph
5-21.

Install the tail cone and secure with screws.

Install the access panel to the aft section of the fuselage.

5-21. RIGGING AND ADJUSTMENT OF STABILATOR TRIM

Refer to Figure 5-5.

WARNING: VERIFY FREE AND CORRECT MOVEMENT OF STABILATOR

TRIM

TAB. 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 STABILATOR TRIM RIGGING
AND ADJUSTMENT, VISUALLY CONFIRM THAT THE STABILATOR

TRIM

TAB

TRAILING EDGE MOVES UP WHEN THE TRIM WHEEL IS TRIMMED

NOSE

DOWN;

AND, THAT THE STABILATOR TAB TRAILING EDGE MOVES DOWN WHEN THE
TRIM WHEEL IS TRIMMED

NOSE

UP.

Level the airplane. (Refer to Leveling, paragraph 2-14.)

Remove the tail cone fairing from the fuselage by removing the attaching screws.

Remove the access panel to the aft section of the fuselage.

Secure the stabilator in its neutral position. To find neutral, place a rigging tool on the upper surface
of the stabilator as shown in Figure 5-6. Zero a bubble protractor on the top of the front seat tracks;
then set it on the rigging tool and tilt the stabilator until the bubble is centered.

Piper PA-34-200T Seneca II, Service Manual

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