Piper Navajo PA-31 Service Manual page 253

2.
With the flaps extended. adjust VL at the rheostat shaft so that the voltage is 2 x VCL
(.44V in the example) below the original VL reading in the DOWN position. Tighten the actuator arm. Now
adjust RT2 so that VL reads .10
10 .05 below VC in the DOWN position.
3.
With the flaps extended. adjust VR at the rheostat shaft so that the voltage is 2 x VCR
(.40V in the example) below the original VR reading in the DOWN position. Tighten the actuator arm. Now
adjust RT3 so that VR reads .10
.
10 -.05 below VC in the DOWN position.
f.
Reinstate the flap motor circuit breaker and select flaps full UP. Record voltages as per step 21. and
repeat the procedures if required. No more than two repeats should be necessary. Ascertain the VL and VR are
within limits of VC as specified in step 17
g.
Check the position indicator readings against the flap selector and flap deflection. using the
following procedure.
1.
When measuring flap deflection angles. lift the trailing edge of the flap to eliminate play
between the rollers and the track slots. If the indicator does not correspond to the flap position. place the flaps
in the APPROACH position.
2.
Adjust the flap indicator "Trimmer". located on the inboard of the amplifier box (opposite the
connector end). so that the flap indicator needle falls in the center of the APPROACH graduation.
3.
Check the location of the flap indicator needle in the UP and DOWN positions. Adjust the
"Trimmer" so that the needle centerline falls within or tangent to the upper or lower edge of the graduation in
the UP. APPROACH. and DOWN positions.
NOTE
If the "Trimmer" is rotated to raise the needle, the needle will raise
about the same in all three positions.
4.
If unable to adjust the indicator needle to provide proper indication (as in example below).
proceed with the following steps:
EXAMPLE
Flap Position
Needed Indicator
UP Center of graduation
APPROACH Center of graduation
DOWN
Below down graduation
(a)
Adjust indicator "Trimmer" so that the flap indicator needle is at the upper tangent of the
graduation at L P and APPROACH positions.
(b)
Now adjust RT3 so that the needle falls within the DOWN graduation.
(c)
Recheck indicator at LP. APPROACH
and DOWN positions readjusting the
"Trimmer" as reguired.
(d)
Check that VL and VR are still within the limits of VCasspecified instep 17. and that the
position indicator agrees with the flaps position in the UP. APPROACH and DOWN
positons.
Revised: 10/12/83
SURFACE CONTROLS
Effectivity
CALCO
1K13
PIPER NAVAJO SERVICE MANUAL