Raytheon Beech Baron E55 - Page 405

Ray~heon
Aircraft
BEECH
BARON
55
AND
58
SHOP
MANUAL
PROPELLER
SYNCHRONIZER
(TC-
1710
AND
AFTER;
TE-981
AND
AFTER;
TH
467
AND
AFTER,
EXCEPT
TH-473
AND
TH-474)
The
optional propeller
synchronizer
automatically
matches
the
rpm
of the
two
engines.
When the
rpm
of
one
engine
changes,
the other
will
automatically
follow the
change
over a
predetermined
range.
This
limited
range
prevents
ei-
ther
engine
from
losing
more
than
a
fixed
amount
of
rpm
in
case
the
other
engine
is
feathered
while
the
propeller
synchronizer
remains
ON.
A
slotted
disc in each
governor
passes
a
magnetic pick-up
and
an
electrical
impulse
is
transmitted to
a
transistorized
control box installed
behind
the
pedestal.
This control box
measures
the
difference
in
pulse
rates
and
changes
the
governor
speed setting by
varying
the
coil
voltage
of
each
governor
until
the
rpm
of
each
engine
is
equal.
The
pro-
peller
synchronizer
may
be
turned
ON
by
a
toggle
switch
located
on
the
lower
pedestal.
To
operate
the
system,
synchronize
the
propellers
in the
normal
manner
and
turn
the
synchronizer
ON.
The
propel-
ler
rpm
of each
engine
will
automatically
adjust
to
the
same
rpm.
To
change
rpm,
adjust
both
propeller
controls
at
the
same
time. This
will
keep
the
propeller
rpm
of each
engine
within the
limited
range
of
the
synchronizer.
If
the
synchronizer
is ON
and the
propeller
rpm
will
not
synchronize,
the
propeller
rpm
is outside
the
synchronizer
range.
Turn the
synchronizer
OFF,
readjust
the
rpm
of each
engine
manually
to
equal
rpm
and
turn
the
synchronizer
ON.
PROPELLER
CONTROL
LEVERS
LOW
RPM
ADJUSTMENT
58P-248-11
Propeller
Low
RPM
Adjustment
Figure
7-2
E16
7-5