Piper COMANCHE PA-24-180 Service Manual page 301

Exaggerated view of nicks in
leading edge
PIPER COMANCHE SERVICE MANUAL
Exaggerated view of nick
in face of blade
A
FIGURE 7-2. TYPICAL NICKS AND REMOVAL METHOD
7-10. Cleaning, Inspection And Repair Of Propeller.
a. Check for oil and grease leaks.
b. Clean the spinner, propeller hub interior and exterior, and blades with a noncorrosive solvent.
c. Inspect the hub pans for cracks.
d. Steel hub parts should not be permitted to rust. Use aluminum paint to touch up if necessary. or
replate during overhaul.
e. Check all visible parts for wear and safety.
f.
Check blades to determine whether they turn freely on the hub pivot tube. This can be done by
rocking the 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. Refer to
Figure 7-2 for propeller blade care.
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 fittings (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.
ZA15