Cessna 172P Pilot's Operating Handbook And Flight Manual page 331

PILOT'S OPERATING HANDBOOK
SUPPLEMENT
19
CE¡SSNA
SOOA
AUTOPILOT
(TYPE AF-39õA)
1.
COURSE
DEVIATION INDICATOR
- Provides VOR/LOC navlgation inputs to
autopilot for
interoept and
tracking
modes.
2.
LOCALIZER
REVERSED
INDICATOR'LIGHT
-
Amborlight,
labelodBO'
illum-
lnates when
BACK
CRg
button
is
pushed
in
(enga,ged) and LOC frequency
setected.
BC
light
indloates courae
lndloator
needle
is
reverged
on
eeleoted
receiver
(wheD
tured
to
olocalizer
frequenoy).
Thts
ligbtis
looatodwithin the
CDI
indica,tor.
3.
NON-SLAVED DIRECTIONAL GYRO
-
Providee a stable
visual
indic¿tion of
aircraft
headiug
to the
pilot
and
provides heading iuformation
to
the
a,utopilot
for
heading intercept and hold.
4.
HEADING
BUGI
-
Moved by
HDG knob
to
sel€ct deslr€d
heading.
5.
LUBBER
LINE
-
Indicatss
aircr&ft heeding on oompaas ca,rd (6).
6.
COMPASS CARD
-
Rotatee
to display heading
of
airplane
with
reference to
lubber
line
(ã).
7.
HEADING
SELECTOF,KNOB
(HDG)
-
When
push€d in' theheadingbug(4)mav
be
positioned
to
tho dosired magrretic headiag by
roteting
the
HDG selector
knob.
Also
used
to
select
VOH,
or
LOC course.
8.
GYRO
ADJUSTMENT
KNOB
(PUSH)
-
When pushed in,
allows
the
pilot
to
ma,nually
rota,te
tho compass
card (6) to coffespoDd
with
the magnetic heeding
indicated
by the compass. The
compass card
must
be
ma,nua,lly reset
perfodically
to
compensate
for precessional errors
in
the
gyro.
9.
TURN
COORDINATOF,
-
Senses
roll
and
yaw
for
wings leveling
a,nd
command
turn
functions.
10.
HDG SEL
PUSHBUTTON
- Aircraft will turn
to
and hold hoading selected by
the
heading
"bug"
on the
directional gyro.
11.
NAV INT
PUSHBUTTON
-
When
heading
"bug"
on DG is
sot
to selected
course'
aircraft
will
turn to
and
intercopt
selected
VOR or
LOC
coureo'
12.
NAV TRK PUSHBUTTON
-
Whsn heading
"bug"
on DG
i6
set
to selected
course'
aircraft
will
track
solected
VOR
or LOC couree.
13. HI
SENS PUSHBUTTON
-
During NAV INT
or NAV TRK oporation' this
high
sensitivity
sotting
incr€a,ses
autopilot
response
to
NAV
signal
to
provide
more
precise operation during localizer
approach,
In low-sonsitivity
position
(push-
button
out),
response to
NAV slgnal
is dampened
for
smoother tra,cking
of
enroute
VOR radials;
it
also smooths
out
effect of
course
scalloping during NAV
opera-
tion.
14.
BACK
CRS PUSHBUTTON
-
Used
with LOC opers,tion only. With
A/P
switch
OFF
or
ON,
and
when
na,viga,tion
roceiver selected
by NAV
switch
is
set
to
a
localizer
frequoncy,
it
rever€os
normal
localizer
needle
indiaation
(CDI)
and
câuses localizer
revorsed (BC) light
to
illuminate.
With
A/P
switch
ON,
rev€rses
Iocalizer
signal to autopilot.
Figure
1.
Cessna 3004
Autopilot, Operating Controls
and
Indicators
(Sheet
2
of
3)
3
30
May
1980