Textron Cessna 172R User Manual

CESSNA
MODEL
172R
SECTION
7
AIRPLANE
&
SYSTEMS
DESCRIPTION
PITOT-STATIC SYSTEM
AND
INSTRUMENTS
The
pitot-static
system
supplies
ram
air
pressure
to
the
airspeed
indicator
and
static
pressure
to
the
airspeed
indicator,
vertical
speed
indicator
and
altimeter.
The
system
is
composed
of
a
heated
pitot
tube
mounted
on
the
lower
surface of
the
left
wing,
an
external
static
port
on
the
lower
left
side
of
the
forward
fuselage,
and
the
associated
plumbing
necessary
to
connect
the
instruments
to
the
sources.
The heated
pitot
system
consists
of
a
heating
element
in
the
pitot
tube,
a
5-amp
switch/breaker
labeled
PITOT
HEAT,
and
associated
wiring.
The
switch/breaker
is located
on
the
lower
left
side
of
the
instrument
panel.
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.
A
static
pressure
alternate
source
valve
is
installed
below
the
throttle,
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
port.
If
erroneous
instrument
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
heater/vents
and
windows.
Refer
to
Section
5
for
the
effect of
varying
cabin
pressures
on
airspeed
readings.
Dec
2/96
7-41
All manuals and user guides at all-guides.com
all-guides.com

Textron Cessna 172R Specifications

General

Brand	Textron
Model	Cessna 172R
Category	Aircrafts
Language	English