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
(-j
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
2e8
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