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Cessna 402C - Page 257

Cessna 402C
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~t402C
SECTION
7
AIRPLANE
&
SYSTEMS
DESCRIPTIONS
-
(decreasing
RPM).
The
source
of
oil
pressure
for
propeller
operation
is
furnished
by
the
engine
oil
system,
boosted
in
pressure
by
the
governor
gear
pump,
and
supplied
to
the
propeller
hub
through
the
engine
crankshaft
flange.
To
feather
the
propeller
blades,
the
propeller
control
levers
on
the
control
pedestal
must
be
placed
in
the
feather
position.
Unfeathering
the
propeller
is
accomplished by positioning the propeller control lever to the
increase
RPM
position.
The
optional
unfeathering
system uses accumulator
air
and
oil
to
force
the
propeller
out
of
feather
and
into
the
low
pitch
condition.
PROPELLER SYNCHROPHASER
The
optional
propeller
synchrophaser
system,
see
Figure
7-27.
is
de-
signed
to
match
propeller
RPM
and
propeller
phase
angle
of
the
two
engines.
The
propeller
RPM
and phase
angle
of
the
slaved
(left)
engine
will
follow
changes
in
RPM
and phase
angle
of
the
master
(right)
engine
over
a 1
imited
range.
This
limited
range
feature
prevents
the
left
engine
from
losing
more
than
50
propeller
RPM
should
the
right
engine
be
feathered
with
the
synchrophaser
system
on.
With
the
function
switch
in
the
OFF
position,
the
system
is
deenergized
and
the
automatic
phaser
RPM
control
is
positioned
to
its
mid-range
to
insure
normal
operation
when
next
turned
on.
When
the
left
engine
is
manually
synchronized
to
the
right
engine
and
the
synchrophaser
switch
is
positioned
to
PHASE,
the
propeller
RPM
of
the
left
and
right
engines
will
be
automatically
synchronized.
The
phase
relationship
of
the
left
engine
propeller
relative
to
the
right
engine
propeller
can
be
adjusted
by
ro-
tating
the
phasing
knob.
After
initial
synchrophaser
engagement,
the
propellers
will
remain
synchronized
and can
be
phased
as
long
as
the
RPM
difference
between
the
left
and
right
engines
does
not
exceed
50
RPM.
When
the
RPM
difference
between
the
left
and
right
engines
exceeds 100
RPM,
the
synchrophaser
1
ight
will
flash
and
the
automatic
phaser
control
circuits
wi
11
be
di
sab
1
ed,
caus i
ng
the
actua
tor
drive
motor
to
stop at a random
position.
If
the
propeller
control
of
the
left
engine
is
again
adjusted
as
close
as
possible
to
the
right
engine.
the
synchrophaser
light
will
illumi-
nate
continuously
and
the
propeller
RPM
of
the
left
and
right
engines
will
be
automatically
synchronized.
PROPELLER SYNCHROPHASER
-
PHASING
KNOB
SYNCHROPHASER
LIGHT
FUNCTION
SWITCH
-
Figure
7-27
1 November 1979
Revision
4 - 1 December 1983
7-531

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