Piper Navajo PA-31 Service Manual page 237

PIPER NAVAJO SERVICE MANUAL
5-61. INSTALLATION OF FLEXIBLE FLAP ACTUATOR SHAFT. (Refer to Figure 5-15.)
a.
Draw the shaft (4 or 6) through the wing into the fuselage.
b. Align and insert tang on shaft assembly into slot in transmission. Tighten nut finger tight and
wrench not over .062 turn from finger tight. When properly installed, the nut on flexible shaft will bottom or
be within .062 of an inch of bottoming against transmission, thus insuring that the end of shaft housing is
firmly seated against transmission. Safety nut with .040 wire.
c.
After the transmission end of the shaft has been connected, observe the clearance between the outer
sheath and inner cable. Twist outer sheath in proper direction; bring clearance to .046 + .031 of an inch. It may
be necessary to loosen clamp on fuselage bulkhead in order to twist outer sheath if cable has not been removed
from aircraft. Holding outer sheath in this position, insert spline into flap motor and tighten nut. Safety nut
with .040 wire. The clearance check noted above must be conducted on every occasion that the flexible shaft is
disconnected from the motor or transmission.
d.
Check the flap rigging and adjustments per Paragraph 5-66 and 5-67.
e. Install the access plates, panels, clamps, grommets and seats.
5-62. REMOVAL OF FLAP TRANSMISSION ASSEMBLY. (Refer to Figure 5-15.)
a.
Lower the flap and remove the access plate on the aft underside of the wing and at the false spar
area, both of which are at station 92.50.
b.
Disconnect the transmission tube ( 19) from the flap horn bracket ( 17).
c. Remove the safety wire ( 12) and disconnect the flexible actuator shaft (4 and 6).
d. Remove the spreader bushing and washers (14) from between the transmission attachment
brackets.
e. Remove the transmission from its mounting brackets and draw the unit through the access
opening in the wing false spar.
5-63. INSTALLATION OF FLAP TRANSMISSION ASSEMBLY. (Refer to Figure 5-15.)
a. Lubricate the flap transmission assembly in accordance with lub chart.
b. Insert the transmission through the access opening in the wing false spar and attach to its
mounting brackets. To allow the transmission to rotate, tighten the attachment bolts (28) only finger tight
and safety.
c. Install the spreader bushing with one washer (14) between each mounting bracket and bushing.
Install the through bolt and secure.
d. If working with the left transmission (7), connect the flexible actuator shaft (6) (per Paragraph
5-61) and safety with .040 safety wire. Attach the right flexible shaft (4) during rigging and adjustment.
e. Check the flap rigging and adjustment per Paragraphs 5-66 and 5-67.
f. Install access plates.
5-64. REMOVAL OF FLAP POSITION SENDER. (Refer to Figure 5-15.)
a. Lower the flap and remove the access plates on the left wing false spar at stations 92.50 and 101
b. Loosen the arm (22) on the sender shaft (21).
c. Disconnect the electrical leads from the sender (23).
d. Loosen the sender attachment nut and slide the sender from its mounting brackets.
e. The flap limit switches (20 and 25) may be removed through these access openings if desired.
Reissued: 10/12/79
SURFACE CONTROLS
Effectivity
1
J21
DUKES