RAZAIR
‐
A1
‐
METRO
‐
III
‐
AFM
‐
001
1
‐
29
STOP
AND
FEATHER
CONTROL
A
two
‐
position
push
‐
pull
knob
(figure
45)
for
each
engine,
marked
“L”
or
“R”
ENGINE
STOP
AND
FEATHER,
is
connected
to
the
fuel
vale
and
the
propeller
feather
valve.
When
the
knob
is
pulled
out,
the
selected
engine
fuel
valve
will
close
and
the
propeller
will
begin
to
feather.
The
feathering
process
starts
after
engine
combustion
is
terminated.
Pushing
in
the
control
back
in
will
defeather
the
propeller
but
the
fuel
valve
remains
closed.
It
can
only
be
opened
by
clicking
on
the
engine
START
button.
OPERATION
There
are
two
modes
of
powerplant
operation:
propeller
governing
mode
and
beta
mode.
The
position
of
the
power
lever
determines
the
mode
of
operation.
When
the
power
lever
is
forward
of
FLT
IDLE,
the
powerplant
is
operating
in
propeller
governing
mode.
When
the
power
lever
is
aft
of
FLT
IDLE,
the
powerplant
is
operating
in
beta
mode.
The
power
lever
determines
the
direction
and
value
of
the
power
developed
by
the
propeller.
The
speed
lever
determines
the
operating
rpm.
When
the
power
lever
is
forward
of
GROUND
IDLE,
the
propeller
is
developing
forward
thrust.
When
the
power
lever
is
aft
of
GROUND
IDLE,
the
propeller
is
developing
reverse
thrust.
Movement
of
the
speed
lever
between
high
and
low
rpm
adjusts
the
propeller
governor.
During
flight,
propeller
governor
rpm
should
be
set
at
either
97%
or
100%
with
the
speed
lever.
Normally
100%
rpm
is
used
for
climb
and
97%
is
used
for
cruise.
Prior
to
landing,
the
speed
lever
is
moved
forward,
setting
the
propeller
governor
at
100%
rpm.
It
is
important
that
the
speed
lever
be
set
at
HIGH,
in
order
to
have
maximum
rpm
available
in
case
of
a
rejected
landing.
After
touchdown
the
power
lever
is
moved
behind
FLT
IDLE
into
the
Beta
range
(reverse
thrust).
The
BETA
lights
should
be
illuminated
when
the
power
levers
are
at
or
below
FLT
IDLE.
CONDITION
LEVERS
The
powerplant
does
not
have
user
controlled
condition
levers.
They
are
coupled
with
the
speed
levers.
Their
position
changes
with
the
speed
levers
position.
The
condition
levers
are
actuated
automatically
as
long
as
the
SRL
computer
is
active;
otherwise
they
are
locked
at
their
lowest
value.
WARNING
Engine
torque
tends
to
increase
when
the
speed
levers
are
at
low
rpm.
An
overtorque
condition
will
appear
if
the
power
levers
are
at
HIGH
while
the
speed
levers
are
at
LOW.
Reduce
power
to
keep
the
torque
within
safe
limits.
IF
THE
OVERTORQUE
CONDITION
REMAINS
FOR
TOO
LONG
THE
ENGINE
WILL
CATCH
FIRE
.