Cessna 152 - Page 118

SECTION7
AIRPLANE
&
SYSTEMS
DESCRIPTIONS
CESSNA
MODEL
152
The
mixture
control,
mounted
above
the
right
corner
of
the
control
pedestal,
is
a
red
knob
with
raised
points
around
the
circumference
and
is
equipped
with
a
lock
button
in
the
end
of
the
knob.
The
rich
position
is
full
forward,
and
full
aft
is
the
idle
cut-off
position.
For
small
adjustments,
the
control
may
be
moved
forward
by
rotating
the
knob
clockwise,
and
aft
by
rotating
the
knob
counterclockwise.
For
rapid
or
large
a,djustments,
the
knob
may
be
moved
forward
or
aft
by
depressing
the
lock
button
in
the
end
of
the
control,
and
then positioning
the
control
as
desired.
ENGINE
INSTRUMENTS
Engine
operation
is
monitored
by
the
following
instruments:
oil
pressure
gage,
oil
temperature
gage,
and
a
tachometer.
The
oil
pressure
gage,
located
on
the
left
switch
and
control
panel,
is
operated
by
oil
pressure.
A
direct
pressure
oil
line
from
the
engine
delivers
oil
at
engine
operating
pressure
to
the
oil
pressure
gage.
Gage
markings
indicate
that
minimum
idling
pressure
is
25
PSI
(red
line),
the
normal
operating
range
is
60
to
90
PSI
(green
arc),
and
maximum
pressure
is
100
PSI
(red
line).
Oil
temperature
is
indicated
by
a
gage
located
on
the
left
switch
and
control
panel.
The
gage
is
operated
by
an
electrical-resistance
type
temperature
sensor
which
receives
power
from
the
airplane
electrical
system.
Oil
temperature
limitations
are
the
normal
operating
range
(green
arc)
which
is
100°F (38°C)
to
245°F (118°C),
and
the
maximum
(red
line)
which
is
245°F (118°C).
The
engine-driven
mechanical
tachometer
is
located
near
the
upper
center
portion
of
the
instrument
panel.
The
instrument
is
calibrated
in
increments
of
100
RPM
and
indicates
both
engine
and
propeller
speed.
An
hour
meter
below
the
center
of
the
tachometer
dial
records
elapsed
engine
time
in
hours
and
tenths.
Instrument
markings
include
a
normal
operating
range
(green
arc)
of
1900
to
2550
RPM,
and
a
maximum
(red
line)
of
2550
RPM.
The
upper
end
of
the
green
arc
is
"stepped"
to
indicate
approximate
RPM
for
75%
engine
power
at
sea
level
(2350 RPM),
at
4000
feet
(2450 RPM),
and
at
8000
feet
(2550
RPM).
NEW
ENGINE
BREAK-IN
AND
OPERATION
The
engine
underwent
a
run-in
at
the
factory
and
is
ready
for
the
full
range
of
use.
It
is,
however,
suggested
that
cruising
be
accomplished
at
65%
to
75%
power
until
a
total
of
50
hours
has
accumulated
or
oil
consumption
has
stabilized.
This
will
ensure
proper
seating
of
the
rings.
The
airplane
is
delivered
from
the
factory
with
corrosion
preventive
oil
in
the
engine.
If,
during
the
first
25
hours,
oil
must
be
added,
use
only
7-16
1
July
1978