Cessna R182 - Airspeed Indicator; Rate-Of-Climblndicator

SECTION
7
AIRPLANE
&
SYSTEMS
DESORIPTIONS
CESSNA
MODEL
R1.82
a
rocker-type
switch
labeled
PITOT HEAT,
a
10-amp
circuit breakeron
the
switch and
contrql
panel,
and associated
wiring.
When the
pitot heat
switch
is turned
on,
the element
in the
pitot
tube
is heated electrically
to
maintain
proper operation
in
possible
icing
conditions.
Pitot
heat should
be used only
as
required.
A
static
pressure
alternate
source
valve may be
installed adjacent
to
the
parking
brake,
and can
be used
if the
external
static,,source
is
malfunctioning.
This valve
supplies static
pressure
from inside the
cabin
instead of the
external
static
ports.
If erroneous
instrurnent
readings
are.suspected
due to
water
or
ice
in
the
pressure line
going
to the
standard,
external
static
pressure
source, the
alternate
static
source
valve should
be
pulled
on.
Pressures
within
the.cabin
will vary
with
open
cabin ventilators and
windows. Refer
to Sections
3
and
5 for the effect
of
varying
cabin
pressures
on airspeed
and
altimeter
readings.
AIRSPEED
INDICATOR
The
aifspeed
indica,tor
is calibrated
in
knots and miles
per
hour.
Limitation
and range
markings
include
the white
arc
(37
to 95
knots)'
green
arc
(42
to 143
knots),
yellow
arc
(143
to 182
knots), and a
red line
(182
knots).
If a
true airspeed
indicator
is installed,
it is equipped
with a
rotatable
ring
which
wofks
in
conjunction
with the
airspegd indicator dial
in a
manner
similar
to the operation
of a
flight
cgnrputer.
To
operate the
indicator,
first
rotate
the ring
until
pressure
altitude is aligned
with
outside
air
temperature
in degrees
Fahrenheit.
Pressure altitude
should
not"be
confused
with indicated
altitude.
To obtain
pressure
altitude,
momentarily
set
the barometric
scale
on the altimeter
to 29,92 and
read
pressure altitude
on
the a,ltimeter.
Be sure to return
the altimeter baromet-
ric scale
to
the original
barometric
setting afterpressure
altitude has been
obtained.
Having
set the
ring to correct
for altitude and temperature,
read
the
true airspeed
shown on
the rotatable ring
by the indicator
pointer.
For
best
accuracy,
the
indicated airspeed should
be corrected to
ca,librated
airspeed
by
referring
to the
Airspeed
Calibration
chart in
Section
5'
Knowing
the
calibrated
airspeed,
read true airspeed
on the ring
opposite
the calibrated
airspeed.
RATE.OF-CLIM
B IN DICATOR
The
rate-of-climb
indicator
depicts airplane rate of climb
or descent
in
feet
per
minute.
The
pointer
is actuated by
atmospheric
pressure
changes
resulting
from
changes of
altitude
as
supplied
by the static source.
7-38