Piper Navajo PA-31 Service Manual page 251

PIPER NAVAJO SERVICE MANUAL
6A. Adjust the UP limit actuating bolt so that the UP limit switch is actuated when the flap is
moved (manually) to the 0 degree position as indicated by the rigging tool.
7A. Repeat the procedure
of step 6A. preceding to adjust the DOWN limit switch (40 degrees).
NOTE
The following rigging limits:
UP 0
°
+1
°
-0
°
(0
°
to 1
°
down)
APPROACH
15 -1°
DOWN 40
°
+ -1
°
8A. Support
the left flap in the full DOWN position as indicated by the rigging tool. Turn the
transmission sleeve for the left flap out from its forward stop (recording the number of turns) until the
attachment
hole in the sleeve aligns with the corresponding hole in the flap horn. Temporarily
install the
attachment bolt.
9A. Repeat the precedure of step 8A preceding for the right flap If the number of turns (plus or
minus one half turn) does not provide alignment of the attachment
hole in the sleeves with the corresponding
hole in the flap horns (attachment bolt cannot be installed), loosen the bolts attaching the horn to the flap
sufficiently to permit movement
of the horn by tapping to achieve proper alignment. Temporarily
install the
attaching
bolt. Retorque the horn attaching bolts. Remove any supporting means from the flaps which should
now be held in place by the sleeve attaching bolts.
10A. Install castellated nuts on the sleeve attaching bolts and tighten the nuts so as to allow 03 of an
inch thrust play for the bolts. Safety
with cotter pins.
11. Connect the flexible drive shafts to the transmissions. Be sure that the splines are properly
engaged and run the shaft attaching nut on finger tight. Safety with MS20995C41 wire.
12. Remove the covers from RT2 and RT3 on the flap control amplifier and ascertain that both
trimmers are in their full clockwise position (maximum resistance).
13 Insert a 30 amp fuse (for test purposes only) in the flap motor electrical power connection.
14
Apply external power to the aircraft and establish bus voltage at 28
-
-.5 volts.
15. Place the flap selector in the DOWN position.
16. Engage the flap control circuit breaker - DO NOT engage flap motor circuit breaker at this
time. Allow five minutes warm-up time.
17. Measure voltage at \ C and adjust voltages of RL and RR by rotating the shafts at the wing
pots as follows:
(a) VL shall be .10 - 10 -.05 below VC in the DOWN position and 10 . 10 -.05 above VC in
the UP position.
(b) VR may be adjusted to within .01 volt of VC to allow the indicator to read correctly
(Suggest using a difference between \ R and VC of I volt for initial adjustment.)
I Lock actuator arms on rheostat shafts. Remeasure
VC. VL and VR to be sure the are still the
same values. Readjust if necessary
Record voltages on work sheet.
19 Move flap selector to the UP position. Listen for audible click of the motor solenoid.
If
solenoid does not actuate check
wiring for proper interconnect.
20
Move flap selector back to full DOWN position.
21 Engage the flap motor circuit breaker and move selector to full UP position. When the flaps
stop moving (actuating arm may not engage the UP limit switch) record system voltages on a work sheet
as follows:
Revised: 10/13/83
SURFACE
CONTROLS
Effectivity
CALCO
1K11