Piper Navajo PA-31 Service Manual page 250

PIPER NAVAJO SERVICE MANUAL
CAUTION
Ascertain that all electrical power to the flap control system is OFF.
(Pull flap control and motor circuit breakers, set battery master
switch OFF and have no external power applied to the aircraft.)
1.
Remove access plates on the false spar at wing stations 92.50 and 101.0 for both right and left
wings.
2. Remove access plates on the bottom of the wings at wing stations 82.75 and 92.50.
3. Ascertain that the flap position sender arm is free to rotate on the rheostat shaft and that the
linkage rod is set at the proper length. (See Figure 5-25. Sketch A.)
4. With the transmission assemblies disconnected from the flap horns and the sleeves turned in all
the way to the ball nut seat, ascertain that the flaps are free to roll full travel on the flap tracks.
NOTE
Steps 5. 6. 7. 8. 9 and 10 apply to aircraft without attachment points
for rigging tools. Steps 5A. 6A. 7A. 9A and 10A apply to aircraft
with serial numbers 31-8112033 and up having the attachment
installed.
5. By manually moving the flap. adjust the UP limit actuating bolt so that the switch is actuated
with a .03 of an inch maximum gap between the rollers and the end of the flap track slot. (See Figure 5-25.
Sketch B).
NOTE
It is the intent here that the electrical limits be reached just prior to
the mechanical bottoming out of the rollers in the slot.
6.
Repeat the procedure of step 5 preceding, to adjust the DOWN limit switch. The above note
still applies.
7. With the flap resting on a .06 of an inch diameter rod between the rollers and end of the flap
track slots, turn the transmission sleeve out from the forward stop (recording the number of turns) until the
attachment holes in the sleeve align with the hole in the flap horn and temporarily install the attachment bolt.
8. Repeat the procedure of step 7 for the opposite flap. The difference in the number of turns
between the right and left transmission sleeve should not exceed 1 2 turn.
9 Check the proper alignment of the sleeve and flap horn. Should the sleeve and horn not align.
loosen the bolts attaching the horn to the flap enough to allow the horn to be moved by tapping to achieve
proper alignment. Retorque the horn attachment bolts.
10. With the sleeves and horns properly aligned, connect them with the bolts and castilated nut.
Tighten the nut so as to allow .03 of an inch thrust play of the bolt. Install a cotter pin in bolt and nut.
5A. Attach the flap rigging tools on the left and right wings upper surface. at station 149.50 by
using existing rivnuts.
NOTE
When measuring the flap deflection angles lift the trailing edge of the
flap to eliminate play between rollers and track slots.
Revised: 10/12/83
SURFACE CONTROLS
Effectivity
CALCO
1K10