Piper Navajo PA-31 Service Manual page 126

PIPER NAVAJO SERVICE MANUAL
f. Insert the elevator trim tab control rod through the right elevator and secure in position. Torque
bolt.
g. Check elevator for proper operation and friction limits per Paragraph 4-91.
h. Connect the navigation light wires and place the tail cone assembly in position. Start all screws
with washers and then tighten.
4-30. ELEVATOR TRIM TAB.
4-31. REMOVAL OF ELEVATOR TRIM TAB. (Refer to Figure 4-6.)
a. Disconnect the control rod at the tab.
b. Remove the hinge bolts securing the tab.
4-32. INSTALLATION OF ELEVATOR TRIM TAB. (Refer to Figure 4-6.)
a. Place the trim tab in position and torque bolts to 38 in. lbs. includes 18 in. lbs. friction torque.
b. Position the tab control rod; install bolt and torque.
4-33. HORIZONTAL STABILIZER.
4-34. REMOVAL OF HORIZONTAL STABILIZER. (Refer to Figure 4-6.)
a. Remove the left and/or right elevator in accordance with paragraph 4-28.
b. Remove the access plates located on each side of the fuselage under the horizontal stabilizers and
the panel located on top of the fuselage aft of the vertical fin.
c. Remove the access panel to the aft inside section of the fuselage.
d. To remove the right stabilizer, locate the elevator trim cable turnbuckles in the aft section of the
fuselage; mark the ends of one turnbuckle to facilitate reinstallation, and block the cables at one of the
fuselage bulkheads and in the stabilizer to prevent the trim cables from unwinding. (Refer to Figure 4-3.)
e. Disconnect the trim cables.
f. Through the top access hole, remove the two elevator trim cable pulleys, spacer and bolt. Draw
the cables through the fuselage to this point.
g. Disconnect the elevator trim sender wires and deicer lines.
h. Remove the mounting bolts that attach the front spar to the fuselage bulkhead.
i. Remove the mounting bolts that attach the elevator torque tube hinge bracket and rear spar.
j. Pull the stabilizer directly away from the fuselage.
4-35. INSTALLATION OF HORIZONTAL STABILIZER. (Refer to Figure 4-6.)
a. Trial fit to ascertain gap between stabilizer and fuselage skin surface is .187 of an inch. Trim to
obtain this gap.
b. Ascertain that the sealer extrusion is attached to the inboard side of the elevator.
c.
Put the stabilizer in position and align the front and rear spar mounting holes. If installing a right
stabilizer, guide the elevator trim cables and sender wires into the fuselage.
d. Position the elevator torque tube hinge bracket and temporarily install the rear spar mounting
bolts.
e. Install the front spar mounting bolts, washers and nuts. Do not torque at this time.
f. Check to determine if a gap exists between the web area of the rear spar and the aft bulkhead of
the fuselage. Should a gap exist, it may be necessary to use a shim plate to fill this gap. To obtain proper
shim thickness, insert a feeler gauge between the spars of both stabilizers and the bulkhead. (Flat shims are
available in thicknesses of .032, P/N 43709-02; .064, P/N 43709-03; .091, P/N 43709.04. Also tapered
shims are available in .064, P/N 43713-02 and .091, P/N 43713-03.)
Revised: 3/11/81
STRUCTURES
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