Piper COMANCHE PA-24-180 Service Manual page 342

Exaggerated view of ncks in w
leading edge
PIPER COMANCHE SERVICE MANUAL
Exaggerated view of nick
in face of blade
A
moving nicks by riffle file and
SECTN
AA-
FIGURE 7A-2. TYPICAL NICKS AND REMOVAL METHOD
7A-13.
a.
b.
C.
Cleaning, Inspection and Repair Of Propeller.
Check for oil and grease leaks.
Clean the spinner, propeller hub interior and
Inspect the hub parts for cracks.
(Refer to Figure 7A-2.)
exterior. and blades with a non-corrosive solvent.
d.
Steel hub pans 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 determine 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 pans. 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.
POWER PLANT
ISSUED: 8/18/72
2C8