Piper Comanche PA-24 Service Manual page 462

PIPER COMANCHE SERVICE MANUAL
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Exaggerated view of nicks in
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Exaggerated view of nick
leading edge
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In face of blade
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Recommended method for
reo
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moving nicks by riffle file and
SECTION AA-
~f.
O"ocus ctoth Blend deepest portion
Nick
In
face of bla
of nick into leading edge align-
by tile ann crocus
ment with smooth curves
recommended
,
FIGURE
7A-2.
TYPICAL NICKS AND REMOVAL METHOD
7A-I3. Cleaning, Inspection and Repair
or
Propeller. (Refer to Figure 7A-2.)
a. Check for oil and grease leaks.
de removed
cloth as
b. Clean the spinner. propeller hub interior and exterior. and blades with a non-corrosive solvent.
c. Inspect the hub parts for cracks.
d. Steel hub parts should not be permitted to rust. Use aluminum paint to touch up. if necessary. or
replace during overhaul.
e. Check all visible parts for wear and safety.
f.
Check blades to
det~rmine
whether they turn freely on the hub pivot tube. This can be done by
rocking the counterweights or blades back and forth through the slight freedom allowed by the pitch
change mechanism. If they appear tight and are properly lubricated. the propeller should be disassembled
by an authorized Service Center.
g. Inspect blades for damage or cracks. Nicks in leading edges of blades should be filed out and all
edges rounded. as cracks sometimes start from such places. Use fine emery cloth for finishing.
h.
It is recommended that for severe damage. internal repairs and replacement of parts. the propeller
should be referred to the Manufacturer or Certified Repair Station.
i. Grease blade hub through zerk fitting (Hartzell propeller only). Remove one of the two fittings for
each propeller blade. alternate the next time. Apply grease through the zerk fitting until fresh. grease
appears at the fitting hole of the removed fitting. Care should be taken to avoid blowing out hub gaskets.
ISSUED: 8/18/72
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