Raytheon Beech Baron E55 - Stall Warning System Adjustment

~eechcraft
BARON
55
AND
58
SHOP
MANUAL
STALL
WARNING SYSTEM
ADJUSTMENT
installation
on
TH-1377
and
after)
has
an
additional
heating
element
in the
mounting
plate.
The
earliest
The
stall
warning
switch
is
carefully adjusted
when
the
airplanes
(prior
to
TE-738,
to
TH-182
and
to
TC-t
936
airplane
is
test
flown
at
the
factory.
Should
it
require
except
TC-1913)
were
produced
with
heaters
as
readjusting,
proceed
as
follows:
Locate
the switch
optional
equipment. Except
for
installations with
high
installation
on
the
undersurface
of the left
wing
and
loosen the
two
phillips-head
screws,
one
on
either
heat,the
stall
warning
switch draws its
electrical
power
side
of
the
vane
from
the
pitot
heat
circuit
breaker. On
those
installa-
tions
equipped
with
a
right
and left
pitot
heat
circuit
NOTE
breaker,
the
stall
warning
switch
heater
draws its
power
from
the left
pitot
heat circuit
breaker.
On
airplane
serials
TH-1377 and after
the stall
warning
switch
is
adjusted by
The heater
for
the
high
heat stall
warning
switch
loosening
the four
mounting
screws
tone
draws electrical
power
from
its
own
7.5-amp
circuit
on
each
corner
of the
mounting
plate).
breaker,
which
is
located
in the left
subpanel.
On
the
Tighten
the
screws
after
each
adjust-
ment.
ground
the
heater
is
restricted
to
operation
at
1/4
bus
voltage
to
prevent
overheating.
When the
airplane
If the
stall
warning
has been
coming
on
too
early, pull
leaves the
ground,
the
contacts
in
the
landing
gear
the
vane
back and down. If the stall
warning
has been
safety
switch close
to actuate
the
landing
gear
safety
coming
on
too
late,
push
the
vane
up
and fonnrard.
relay.
Refer
to
Figure
11-19.
When
the
relay
contacts
I
Moving
the
vane
with the
Phillips
screw
loosened
close,
full bus
voltage
is
applied
to
the stall
warning
moves
the
entire
unit
up
or
down
inside
the
wing
caus-
switch heater.
The
major
components
of
the
system
ing
the
switch
to
be
closed
earlier
or
later.
Retighten
,le,s
follows:
the
screws
after
making
each
adjustment.
NEVER
TRY
TO ADJUST THE
SWITCH
BY
BENDING
THE
a.
The
7.5-amp
circuit
breaker in the left
subpanel.
VANE.
As
a
rule of
thumb,
moving
the
vane 1/4
inch
will
change
the
time the stall
warning
actuates
by
about
5
mph
of
indicated
air
speed.
The
only
way
to
test
the
accuracy
of the
setting
is
to
fly
the
airplane
into
a
stall,
ADJUST
UP
TO
ACTUATE
SOONER
noting
the
speed
at
which the
warning
horn
and
light
comes on
and the
speed
at
which
the
full stall
occurs.
The
stall should
be
made
with
the
flaps
and
gear up
and
power
off. Prior
to
the stall decelerate
no
faster
O
than
one
mph
per
second. It
may
be
mecessary
to
warning
should
actuate,
ideally,
at
7
to
9
mph
ahead
i
LO
u
make
several
alternate
adjustments
and
test
flights
before
the desired
setting
can
be reached.
The stall
of
the
complete
stall,
although
5
to
10
mph
ahead of
the
complete
stall will
meet
FAA
requirements.
The
ADJUSTMENTO
switch
setting
should
be checked
and
adjusted
as
SCREWS-
necessary
whenever
a
wing
or
wing leading edge
is
O
replaced
or
extensively
repaired
or
if
a new
switch is
O
installed.
The switch should
require
no
adjustment
in
\3
C
normal
service.
ADJUST
DOWN
TO
STALL
WARNING SWITCH HEATER
ACTUATE
LATER
60251-11
The
stall
warning
switch heater
is
installed
to
prevent
ice from
forming
around
or on
the switch
vane caus-
ing
erroneous
indications.
All
of the heated
switches
have
a
heating
element
in
the
switch while the
high Figure
11-18.
Stall
Vane
Adjustment (TH-1
thru
heat
switch
(installed
as
part
of
optional
deice boot
TH-13‘n)
11-40
E~5