Piper Navajo Chieftain PA-31-350 Service Manual page 240

NAVAJO CHIEFTAIN SERVICE MANUAL
1.
Remove access plates on the false spar at wing stations 92.50 and 101.00 from both right and
left wings.
2.
Remove access plates on bottom side of both left and right 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 5-28, Sketch A.)
4.
Remove the horns from the flaps. With the transmission assemblies disconnected from the
flap horns, and the sleeves turned in all the way to the ball nut seat, determine that the flaps are free to roll full
travel on the flap tracks.
CAUTION
When adjusting the UP and DOWN flap limits, it is essential
that the electrical limits be reached just prior to reaching the
mechanical limits.
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 31-8152060 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 0.03 of an inch maximum gap between the rollers and the end of the flap track slot. (See Figure 5-28,
Sketch B).
6.
By manually moving the flap, adjust the DOWN limit switch actuating bolt so that the switch
is actuated with a 0.03 of an inch maximum gap between the rollers and the end of the flap track slot..
7.
With the flap resting on a 0.06 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. Torque the horn attachment bolts.
10. With the sleeves and horns properly aligned, connect them with the bolt and castellated nut.
Tighten the nut so as to allow 0.03 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 147.50by
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: 3/31/94
SURFACE CONTROLS
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