Piper SENECA III - Propeller Service

SECTION
8
PIPER AIRCRAFT
CORPORATION
HANDLING, SERV
& MAINT
PA-34-220T,
SENECA
IH
8.17
PROPELLER
SERVICE
The
gas
charge in the propeller
cylinder
should
be
kept
at
the
pressure
specified
on
the
placard located
in
the
spinner
cap.
The
pressure
in the
cylinder
will
increase
about
one-third
psi for
every
degree
Fahrenheit
increase
in
temperature,
This
effect
should be
considered
when
checking
pressure.
The
charge
maintained
must
be
accurate
and
free
of excessive
moisture
since moisture
may
freeze
the
piston
during
cold weather.
Dry
nitrogen
gas
is
recommended.
CHAMBER
PRESSURE
REQUIREMENTS
WlTH
TEMPERATURE
FOR
HARTZELL
COUNTERWEIGHT
TYPE
PROPELLERS
FOR
PROPELLER
HUBS:
BHC-C2YF-2CKUF
AND
BHC-C2YF-2CLKUF
Temp
°F
Pressure
(PSI)
70
to
100
22
±
2
40
to
70
17
±
2
0
to
40
14
±
2
-30
to
0
9
±
2
NOTE: Do
not
check
pressure or
charge
with
propeller
in
feather position.
The
spinner
and
backing
plate
should
be
cleaned
and
inspected
for
cracks
frequently.
Before
each
flight
the
propeller
should
be
inspected
for
nicks.
scratches.
or
corrosion.
If found, they
should
be
repaired
as soon
as
possible
by
a
rated
mechanic,
since
a
nick
or
scratch
causes
an area
of
increased
stress
which
can
lead
to
serious cracks
or
the
loss
of
a
propeller
tip.
The
back
face
of
the
blades
should
be
painted
when
necessary
with
flat black
paint
to
retard
glare.
To
prevent
corrosion,
all
surfaces should
be
cleaned
and
waxed
periodically.
The
gas
charge
in
the
optional
unfeathering accumulators
should
be
maintained
at
90
-
100
PSL It
is important
to
use
nitrogen
only
for
this
purpose
since
any
moisture
in the
system
may
freeze and
render
it
inopera-
tive.
Do
not
check
this
charge
pressure
while
engine
is
running.
REPORT:
VB-IIIO
ISSUED:
JANUARY 8,
1981
I()
REVISED: APRIL 9,
1982