Piper SENECA III - Gyro Suction Failures

PIPER
AIRCRAFT
CORPORATION
SECTION 3
PA-34-220T,
SENECA
Ill
EMERGENOV
PROCEDURES
If
abnormally
high
alternator
outputs
are
observed
and
persists
(more
than
10
amps
above
known
electrical
loads)
they
may
be
caused
by
a
low
battery.
a
banery
fault,
or
other
abnorrud
electrical
load, if
it
is
caused bya
low
batters
the
indication
should
begin
to
decrease towards
normal
within
5
minutes. Il
this
condition
is
observed
proceed
with
the
following.
Turn
the
battery
switch
OFF
and the
alternator
output
indications
should
decrease.
Turn
the
battery
switch
ON.
Should
the
alternator
output
indications
not
decrease,
lease
the
battery
switch
OFF
and
land
as
soon
as
practical.
All
electrical
load is
being
supplied
by
the
alternators.
Also anticipate
complete
electrical
power
failure.
NOTE
Operation
with the alternator
ON
and
the
battery
switch
OFF
should
be
made
only when
required
by
electrical
failure. due
to
increased
system
voltage
and
radio
frequency
noise.
3.25
GYRO
SUCTION
FAILURES
A
maltunction
of
the
instrument
suction
system
will
be
indicated
by
a
reduction
of
the
suction
reading
on
the
.gauge.
in
the
event
of
a vacuum
tem
failure
or
a
feathered
engine,
a
low
vacuum
warning
light
on
the
annunciator
panel
will
illuminate.
In
the
erent
of
a
suction
system
malfunction.
(suction
lower
than
4.5
inches
of
mercury)
increase
engine
R
PM
to
2600. Descend
to
an
altitude
at
w
hich
4.5
inches
of
mercury
suction
can
be
maintained.
if
possible.
The
electric
turn
indicator
should
be
used
to
monitor the
performance
of
the
direedonal
and
attitude
indicators.
ISSUED:
JANUARY
8, 1981
REPORT:
VB-1110
REVISED:
AUGUST
9,
1982
3-23