SECTION
7
AIRPLANE
&
SYSTEMS DESCRIPTION
CESSNA
MODEL 172R
Oil
pressure
signals
are
generated
from
an
oil
pressure
line/transducer combination.
An
oil
pressure
line is routed from the
upper
front
of
the engine
case
to
the rear
engine baffle.
At the
baffle,
the oil
pressure
line is connected
to
a
transducer. This
I
transducer produces
an
electrical
signal
which is
translated
into
a
pressure reading by the oil
pressure
gage located on the LH
instrument panel.
In
addition, a
separate
low
oil
pressure
indication is
provided
through
the panel
annunciator. This
annunciator is
wired
to
a
pressure
switch located
on
the
rear
of
the
engine accessory
case.
When oil
pressure
is below 20 PSI,
the
switch grounds and
completes the annunciator
circuit, illuminating
the red
OIL PRESS
light. When
pressure
exceeds
20 PSI,
the
ground
is removed
and
the
OIL
PRESS annunciator goes
out.
NOTE
The
low oil
pressure
switch
is also
connected
to
the
hour
(Hobbs)
meter.
When
pressure exceeds
20
PSI,
a
ground
is
supplied
to
the hour
meter,
completing
the hour
meter
circuit.
Oil
temperature
signals
are generated
from
a
resistance-type
probe
located
in the engine accessory
case.
As
oil temperature
changes,
the probe
resistance
changes.
This resistance is
translated into
oil temperature readings
on
the cockpit indicator.
The engine driven
mechanical tachometer
is located
on the
instrument
panel
to
the
right of
the pilot's control
wheel.
The
instrument
is
calibrated
in
increments
of
100
RPM
and
indicates
both engine and propeller speed. An hour
meter
in
the
lower
section
of the dial
records
elapsed
engine
time in hours
and tenths.
Instrument markings include the
normal
operating range (green
arc)
from 1
900 to 2400 RPM.
The
exhaust gas
temperature
(EGT)
indicator
is located on the
LH instrument
panel as
part
of
the
EGT/Fuel Flow
indicator.
Since
exhaust gas temperature varies with
fuel-air
ration (mixture), density
altitude,
throttle
position and RPM, the instrument is
a
useful
aid
in
adjusting
the mixture for best economy
or
performance. The EGT
indicator allows
the
pilot
to
lean
(reduce
the proportion of fuel in the
fuel-air
mixture) to
a
known value using the maximum or "peak"
exhaust
gas
temperature
as
a
reference.
An index pointer which
can
be positioned manually is
provided
for
the
pilot
to
mark the
location of the peak.
Never lean using
EGT
when operating
at
more
than
80%
power.
7-20
Revision 7
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Содержание Cessna 172R
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