Piper SENECA III - Page 290

SECTION 9
PlPER
AIRCRAFT
CORPORATION
SUPPLEMENT 5
PA-34-220T,
SENECA
III
capture
exists
at
mode
engagement,
the
pilot is
required
to set
up an
intercept angle
using
either
HDG
or
AP
mode. NAV
may
be
disengaged by
depressing
the
NAV
switch
or
by engaging
HDG
when
in
NAV
CPLD
or
NAV
ARM.
CAUTION
The "NAV"
mode
of operation
will
continue
to
provide
airplane
commands
and/or
control
without
a
valid VOR/LOC
signal
(NAV
flagin
view).
Also
erroneous
navigation
information
may
result
from COMM
radio interference
with
the NAV
radio.
This
erroneous
infor-
mation
may
cause
premature
NAV
captures
as
well
as
erroneous
steering information. Should
this
occur
reselect
HDG
mode and then
reselect
NAV mode.
(7)
Approach
Mode (APPR):
The
Approach
mode
may
be
selected by
tuning
the NAV
receiver
to
the
desired VOR
or
LOC frequency,
setting
the CDI
to
the
desired radial
or
inbound
heading and depressing the
APPR
switch
on
the
Mode
Controller.
The annunciator
will
indicate
APPR ARM
until
the
course
is
captured unless
the
APPR
mode
is
engaged
with
wings level and there
is
a
centered
needle
on
the CDI. In
that
situation, the mode
will
go
directly
to
APPR CPLD
as
displayed
on
the
annunciator
panet
The
system
can
intercept
at.any
angle
up
to
90° and will
always
turn
toward
the
c.ourse
pointer. See approach procedure
for
more
detail.
APPR
mode
can
be
disengaged
by
depressing the
APPR
switch
on
the Mode
Controller;
or
by engaging HDG
when
in
APPR
CPLD
or
engaging NAV
when
in
APPR CPLD
or
APPR
ARM.
The
annunciator
panel
indicates
the
status
of
the
approach
mode.
I
REPORT:
VB4110
.1SSUED:
APRIL
21,
1981
944,
12 of
16