Cessna 172P - Page 141

CESSNA
MODEL
172P
pei
(red
Iine) and
õ0-90
psi
Servlce Kit
SKl72-81,
SKI
SECTION
7
AIRPLANE & SYSTEMS DESCRIPTIONS
control
may be
moved forward
by
rotating the knob clockwise,
and aft by
rotating
the
knob counterclockwise.
For
rapid or large
adjustments, the knob
may be
moved
forward or aft by depreseing 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. An
economy mixture
(EGT)
indicator
and a carburetor air
temperature
gage
are also available.
The
oil
pressure gage,
located on the left side
of the inetrument
panel,
is
operated
by oil
pressure.
A
direct
preesure
oil line from
the engine
delivers oil
at engine
operating
p¡essure
to the oil
pressure gage.
Gage
markings
indicate
that minimum
idling
pressure
is
t25
PSI
(red
line), the
normal operating
range
is
*60
to 90
PSI
(gveen
arc) and maxirnum
pÌesaure
is 115
PSI
(red
line).
Oil
temperature is
indicated
by a
gage
adjacent
to the oil
pressure gage.
The
gage
is operated by
an electrical-¡eeistance
type
temperature
senaor which
receives
porver
from the airplane
electrical
system.
Gage
markings
indicate
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
on the instrument
panel
to
the left
of the
pilot's
control
wheel. The instrument
is
calibrated in
increments
of 100 RPM and indicates
both
engine and
meter
in the
lower section of the
dial
records elapsed
tenths.
Instrument
markings
include
the normal
o
width
green
arc) of
2100 to 2700
RPM
and a maximum
(red
line)
of 2700 RPM.
The multiple
width
green
arc has
steps
at 2460 RPM,
2575
RPM and 2700 RPM
which
indicate a 767o engine
power
setting
at altitudes
of sea level,
5000
feet
and
10,000 feet.
An
and
is
located
in
the
tailpipe
icator.
The
indicator
serves as a visual
aid.
to the
pilot
in
a{usting
cruise
mixture.
-air
ratio,
power
and RPM.
GT at cruiee
mixture
setting is
leaning
aid. The
indicator is
inter.
*20
by
30
May 1980
Revision
2 - 1
October 1994
(green
arc)
on airplanee
modifiod
72-82
or
SKI?2-1234.
7-I7