Piper SENECA III - Page 306

SECTION 9
PIPER
AIRCRAFT.CORPORATION
SUPPLEMENT
7
PA-34222ûT,
SENECA
III
The
function
of
the
synchrophaser
is
to
maintain
both
propellers
at
the
same
RPM
and
at
a
selected
phase
angle. This
eliminates
the
propeller
"beat"
effect
and
minimizes
vibration.
When the
synchrophaser
is
installed,
the
left
engine
is
established
as
the
master
engine,
and
the
right engine
is
equipped
with
a
slave
governor
which
automatically maintains its
RPM
with
the
left engine RPM.
When the
propeller synchrophaser
is installed,
a
rotary
switch
is
located
on
the
throttle
quadrant
below
the propeller
controls. It
is
labeled OFF
for manual
control
or
standby
and PHASE
ADJUSTMENT
for
propeller
synchronizing
and
phase
angle
adjustment.
SECTION
2
-
LIMITATIONS
Placards:
On
the
throttle
quadrant below
engine
and
propeller
controls:
USE
OFF
POSITION
FOR TAKEOFF,
LANDENG AND
SlNGLE
ENGINE
OPER-
ATIONS.
SECTION
3
-
EMERGENCY
PROCEDURES
The
propeller
synchrophaser
must
be
in the
OFF
position
forall
single
engme
operations.
SECTION 4
-
NORMAL
PROCEDURES
The
rotary
switch
must
be
in the
OFF
position
during taxi,
takeoff,
landing
and
single
engine
operations.
Aefore
operating the
synchrophaser
system,
.ensure
that
the
rotary
switch
is.in
the
OFF
position and
manually
synchronize
the
propellers
to
within
40
RPM.
To
operate, rotate
the
switch
clockwise
out
of
the
OFF detent
and
slightly
into the
PHASE
ADJUST-
MENT
range.
It
may
require
up-to
30
seconds
for
the
propellers
to
syn-
chronize. The
phase
angle
of
the
propellers
may
then be
adjusted
by
rotating
the
switch
within
the
PHASE
ADJUSTMENT
range
to
obtain the
smoothest
operation.
Remember
to
wait
30
seconds
after
any
switch
move-
ment
for
the
propellers
to
assume
the
new
phase
angle.
Turn the
synchro-
phaser
switch
to
the
OFF
position
for
30
seconds
before
changing
power
settings;
re<stablish
synchrophaser
operation
following
power
changes
using
the above
procedure.
Pulling the
circuit
breakers
completely
de-
activates
the
propeller
synchrophaser
system.
If
the
master
switch
is
turned
REPORTrVBull10
ISSUED:
JANUARY-8, 1981
9-56.
2
of 4