Piper SENECA III - Page 395

PIPER
AIRCRAFT
CORPORATION
SECTION
9
PA-34-220T,
SENECA
III
SUPPIÆMENT
21
Figure
7-l
(cont)
4.
NAV
(Navigation)
Mode
Selector Switch
-
providesautomatic45°
VOR-LOC
intercept
angle: tracking
and
crosswind
correction.
The
autopilot utilizes the
HDG
bug
as
the
VOR
course
reference
and
a
separate
VOR indicator instrument
for
left-right
information
when
using
a
D.G.
or
the
course
indicator
and
left-right
needle
for
reference
inputs
when
using
an
H.S.L
type
compass
VOR
display.
The
NAV mode
proxides
automatic pain
and
rate
reductions
and
bank
limiting
to
improve
tracking
performance.
NAV
mode
should
normallybe usedasanenroutefunction.Select
APR
modefor
LOC
and
VOR
approaches.
NOT
ES
1. The
heading
bug
is
disabled
when using
an
H.S.l.
and
NAV,
APR
or
REV
is
selected.
except
when using
selected
angle
intercept
feature (refer
to
Special
Modes
and
Operations)
2. With
a
D.G..
the
heading
bug
must
be
set to
the
desired
radio
course
when using
NAV.
APR
or
REV
modes.
Select desired
course on
H.S.l.
course
selector
(or
OBS
and D
G.)
and select
NAV
mode
for VOR
tracking.
5.
APR
(Approach)
Mode
Selector
Switch
-
provides
automatic
45°
VOR-LOC
intercept
angle,
tracking and
crosswind
correction
during instrument
approach operations.
llG
H.S.I.
operation
and
function
are
identical
to
NAV
mode.
Select
thedesired
course
on
H.S.I.
(or
O.B.S.
and
D.G.)
course
selector and
select
APR
mode.
6.
REV
(Back Course) Mode Selector
Switch
-
for
use
in
tracking
the
LOC
front
course
outbound,
or
the
LOC
back
course
inbound,
or
the
pubbshed VOR
approach
course
outbound.
When using
an
H.S.L display
always
set
the
course
selector
on
the
inbound
front
localizer
course or
VOR
inbound
published
approach
course
when
using REV mode.
When
using
a
D.G.
the heading
bug
must
be
set
to
the
final
approach
course.
7. Pitch
Modifier Attitude
Selector
Switch
The
pitch
data
modifier
is
a
momentary type
switch
that
is
used
to
select
the
ATT mode
or
modify
the
aircraft
attitude.
When
the
autopilot
is
engaged,
automatic
pitch
synchronization
is
provided
to
the
attitude exísting
at engagement,
in ATT
mode,
actuation
of
the
modifier
UP
or
DN
will
cause
a
pitch
attitude
change
at
a
rate
of
ISSUED:
FEBRUARY 10,
1984
REPORT:
VB-ll10
11 of
20,
9-145