Piper Navajo PA-31 Service Manual page 86

PIPER NAVAJO SERVICE MANUAL
g.
Inspect the swaged fittings at both ends of the flexible shaft as follows:
1.
Expose the swaged portion of the inner cable at the motor end by twisting the outer housing
two turns clockwise. The swaged portion of the cable should hate six (6). or eight (8). flats clearly visible and
free from deep scratches or wear marks.
2.
L sing a micrometer or dial caliper measure the diameter of the swage for each of the flats at the
middle of the swaged portion of the cable. A total of three measurements should be taken for the six flat cable
end. and four measurements should be taken for the eight flat cable end. If any of the measurements on the six
flat cable end exceed .235 inches. replace the drive shaft. If an of the measurements on the eight flat cableend
exceed .247 inches. replace the drive shaft.
3.
Disconnect the drive shaft from the flap transmission. Using caution not to damage the shaft
housing. route inboard through station 87.50 bulkhead. (Refer to Figure 3-2a. Sketch 2). Inspect the swaged
porition of the drive blade fitting end as described in steps "1" and "2" above.
4.
Inspect the drive blade dimension as shown in Figure 3-2a. View B.
h.
Inspect the internal splines of the drive coupling for evidence of wear If splines are distorted or
significantly worn. replace the drive shaft. The following method may be used to determine whether the
amount of spline wear is acceptable
1.
Twist a piece of 032 safety wire around the swaged fitting at the motor end of the drive shaft to
form a pointer. ( Refer to Figure 3-2a. Sketch 3). With one end of the flap motor armature shaft secured. engage
the opposite end into the flexible shaft spline.
C709
SKETCH 1
FORWARD
SEE VIEW
A
SEE VIEW A
RIGHT LONGITUDINAL
BEAM
LEFT LONGITUDINAL BEAM
FLAP MOTOR
FLEXIBLE SHAFT
FLEXIBLE SHAFT
TO LEFT FLAP TRANSMISSION
TO RIGHT FLAP TRANSMISSION
MEASURE SWAGE DIMENSION HERE STA
/( 247 INCHES MAX )(6 27 MM) EIGHT FLAT CABLE)
(235 INCHES MAX) 5 97 MM) (SIX FLAT CABLE)
INNER
SPLINE DRIVE COUPLING / CABLE HOUSING
RETAINING PIN / \CHECK
HERE FOR SIGNS OF
WASHER
SPLINE FITTING LOOSENESS
VIEW A
Figure 3-2a. Wing Flap Actuator Cable - 500 Hour Inspection
Revised: 3/2/84
INSPECTION
ID14