Piper SENECA III - Page 388

SECTION
9
PIPER
AlRCRAFT
CORPORATION
SUPPLEMENT 21
PA-34-220T, SENECA III
b.
To
disable
heading
card
-
pull
circuit breaker
and
use
magnetic
compass
for
directional
data.
NOTE
ff
heading
card
is
not
operational
autopilot
should
not
be
used.
c
With
card
disabled
VOR
Localizer
and
Glide
Slope
displays
are
still
functional;
use.card
set
to rotate
card
to
aircraft
heading for
correct
picture.
d
Slaving
Failure
-(i.e.
failure
to
self
correct
for
gyro
drift):
1.
Check
gyro
slaving
switch
is
set
to
No,
I
position
(if
equipped
with
Slave
N
o.
1
-
No.
g.switch)
or
SL
A
VED
position
when
equipped
with
Slaved
and
Free
Gyro
Mode
Switch.
2.
Check
for
HDG Flag,
3
Check
compass
circuit
breaker.
4
Reset
heading
card
while
observing
slaving
meter.
NOTE
Dead
slaving
meter
needle
or a
needle
displaced
fully
one
direction
indicates
a
slaving
system
failure.
5.
Select
slaving
amplifier
No.
2.
if
equipped.
6.
Reset
heading
card
while
checking
slaving
meter
If
proper
slaving
indication
is
not
obtained,
switch
to
free
gyro
mode
and
periodically
set
card
as
ari
unslaved
gyro.
NOTE
in
the
localizer
mode,
the
TO
FROM
arrows
may
remain
out
of
view,
depending
upon
the
design
of
the
NAV
converter
used
in the
instal-
lation.
REPORT:
VB-1110
ISSUED:
FEBRUARY
10, 1984
9-138,
4
of
20