Textron Cessna 172R User Manual

CESSNA
MODEL
172R
SECTION
7
AIRPLANE
&
SYSTEMS
DESCRIPTION
ALTIMETER
Airplane
altitude
is
depicted
by
a
barometric
type
altimeter.
A
knob
near
the
lower
left
portion
of
the
indicator
provides
adjustment
V
of
the
instrument’s
barometric
scale
to
the
current
altimeter
setting.
VACUUM
SYSTEM
AND
INSTRUMENTS
rThe
vacuum
system
(Refer
to
Figure
7-9)
provides
suction
necessary
to
operate
the
attitude indicator
and
the
directional
indicator. The
system
consists
of
two
engine-driven
vacuum
pumps,
two
pressure
switches
for
measuring
vacuum
available
through
each
pump,
a
vacuum
relief
valve,
a
vacuum
system
air
filter,
vacuum
operated
instruments,
a
suction
gauge,
low
vacuum
warning
on
the
annunciator,
and
a
manifold
with
check
valves
to
r
allow
for
normal
vacuum
system
operation
if
one
of
the
vacuum
pumps
should
fail.
ATTITUDE
INDICATOR
r
The attitude indicator is
a vacuum
air-driven
gyro
that
gives
a|
visual indication
of
flight
attitude. Bank attitude
is
presented
by
al
pointer
at
the
top
of
the
indicator
relative
to
the bank scale which
has index marks
at
10°, 20°,
30°,
60°,
and
90°
either
side
of
the
center
mark. Pitch and roll
attitudes
are
presented
by
a
miniature
airplane superimposed
over a
symbolic
horizon
area
divided
into
two
sections
by
a
white horizon bar. The
upper
"blue
sky"
area
and
the lower
"ground"
area
have
pitch
reference
lines
useful
for
pitch!
attitude
control.
A
knob
at
the
bottom
of
the instrument
is
provided!
for
in-flight
adjustment
of
the
symbolic
airplane
to
the
horizon
barl
for
a
more
accurate
flight
attitude
indication.
DIRECTIONAL INDICATOR
The
directional
indicator is
a
vacuum
air-driven
gyro
that
displays!
airplane
heading
on
a
compass
card
in
relation
to
a
fixed
simulated!
airplane
image
and
index. The indicator
will
precess
slightly
over
a
r
period
of
time.
Therefore,
the
compass
card should
be
set
with
the!
magnetic
compass
just
prior
to
takeoff,
and
readjusted
as
required!
throughout
the
flight.
A
knob
on
the
lower
left
edge
of
the
instrument!
is
used
to
adjust
the
compass
card
to
correct
for
precession.
A
knob
on
the lower
right
edge
of
the instrument
is
used
to
move
the
heading
bug.
Feb
28/00
7-43
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Textron Cessna 172R Specifications

General

Brand	Textron
Model	Cessna 172R
Category	Aircrafts
Language	English