Piper SENECA III - Page 298

SECTION
9
PIPER AIRCRAFT
CORPORATION
SUPPLEMENT 6
PA-34-220T,
SENECA
III
The
heated
lift
detectors,
one
inboard
and
one
outboard
on
the
left
wing,
are
installed
to
prevent
icing
conditions-from
interfering
with
operation of
the
stall
warning
transmitters. A
Stall
Warn
circuit
breaker
in
the
circuit
breaker
panel
protects
the
system
against
an
overvoltage
condition.
The
stall
warning
system
should
not
be depended
on
when
there is ice
on
the
wing.
A
heated pitot
head,
mounted under
the
left wing,
is
installed
to
provide
pitot
pressure
for
the
airspeed
indicator
with
heat
to
alleviate
ice
accumu-
lation from
blocking
the
pressure
intake. The heated
pitot head
also
has
a
separate
circuit breaker
located
in the
circuit
breaker panel
and
labeled
Pitot Heat.
With the
heated
pitot switch
on,
check
the
heated pitot head
and
heated
lift
detector
for
proper
heating.
CAUTION
Care
should
be taken
when
an
operational
check
of the heated
pitot
head
and the heated
lift
detectors
is
being
performed.
Both
units
become
very
hot.
Ground
operation
should
be
limited
to
3
minutes
maximum
to
avoid
damaging the
heating elements.
SECTION 2
-
LIMITATIONS
(a)
Equipment
required
for
flight
into
known
or
forecast
.icíng:
(l)
Pneumatic
wing
and
empennage
boots.
(2)
Wing
ice
detection
light.
(3)
Electrothermal
propeller
deice
pads
on
the propeller blades.
(4)
Electrothermal
windshield
panel.
(5)
Heated
lift
detectors.
(6)
Heated
pitot head.
(7)
Propeller
spinners.
(b)
If
all the
equipment
listed
above
is
not
operative
or
not
installed,
the
follon ing
placard
must
be
installed
in full
view
of the
pilot.
WARNING
-
THIS
AIRCRAFT IS NOT
APPROVED
FOR
FLIGHT IN ICING
CONDITIONS.
.
REPORT: VB-1110
ISSUED: JANUARY 8;1981
9-50, 6
of
10
REVISED:
AUGUST
17,
1981