Piper Navajo Chieftain PA-31-350 Service Manual page 243

NAVAJO CHIEFTAIN SERVICE MANUAL
CAUTION
Make no adjustments until the flap motor circuit breaker is
pulled OFF.
2. With the flaps extended, adjust VL at the potentiometer shaft so that the voltage is 2 x AVCL
(0.44V in the example) below the original VL reading in the DOWN position. Tighten the actuator arm. Now
adjust RT2 so that VL reads 0.10 +0.10/-0.05 below VC in the DOWN position.
3.
With the flaps extended, adjust VR at the rheostat shaft so that the voltage is 2 x AVCR
(0.40V 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 end of the amplifier box (oppo-
site 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.
THIS SPACE INTENTIONALLY LEFT BLANK
Revised: 3/31/94
SURFACE CONTROLS
1K3