Stall Warning System Adjustments; Magneto Timing - Beechcraft TRAVEL AIR 95 Shop Manual

installed
on the
firewall
to
provide
the
intake
side if a
new
switch is installed. The switch should
re-
of
the
dry air pump with dry, ambient air. At quire
no
adjustment in normal service.
approximately 100 hours, the
filter
should be
removed,
cleaned
with solvent and blown dry with
air pressure. MAGNETO
TIMING
STALL
WARNING SYSTEM ADJUSTMENTS
Remove
the
top
spark plug from
the
No. 1 cylinder.
Place
the thumb
of one hand over
the
spark
plug
The stall warning switch is carefully adjusted when hole and rotate
the crankshaft
in direction
of normal
the
airplane
is
test
flown at
the
factory.
Should it rotation until
the
compression stroke is reached.
require readjusting, proceed
as follows: Locate the
The
compression stroke is indicated
by a positive
switch installation on
the
under
surface
of
the
left
pressure inside
the
cylinder
tending to
lift the thumb
wing
and loosen
the two
Phillips-head
screws, one off
the
spark
plug hole. In
this
position both valves
on either side of
the
vane.
If
the
stall
warning
has
of No. 1 cylinder
are closed.
been coming on
too
early, pull
the
vane back and
down. If
the
stall
warning has been coming on
too
Rotate
the
crankshaft opposite
to
its normal direction
late,
push
the
vane up and forward. Moving
the
vane of rotation
until it is approximately
35° before
top
with
the
Phillips-head
screws loosened moves
the
center of
the
compression stroke of No. 1 cylinder.
entire unit up or down inside
the
wing causing
the
switch
to
be closed
earlier or later.
Retighten
the
Having determined
that
the engine is beginning
the
screws
after making each
adjustment.
NEVER
compression stroke on No. 1 cylinder,
continue
to
TRY
TO
ADJUST
THE SWITCH BY BENDING
rotate
the
crankshaft in its normal direction
of
THE VANE.
rotation until
the
25°
advance
timing
mark
on
the
front
(propeller) face of
the
starter ring gear is in
exact alignment with
the
small hole located at
the
two
o'clock position
on
the
front
face
of
the starter
Adjust
Up
to housing.
Actuate Sooner
NOTE
cos.
,
With
the
engine cowling
removed,
the crank-
VANEduwr
Shaft
can be aligned
in
the
correct
firing
position for No. 1 cylinder by
means
of
the
advance
timing
marks
on
the
rear face
of
the
starter ring gear. This is done by
attaching an ignition
timing
pointer
to the
Adjustment
Screws
ring gear with
the
pointer
accurately lined
up with
the
timing
mark on
the
rear face
of
the
gear. The
crankshaft
is
then
rotated
'
O
O
in its normal
direction of rotation until
the
pointer is in alignment with
the
crankcase
parting
line.
Adjust
Down
to
Actuate Later
With
the
magneto gear assembled on
the
right
mag-
neto,
remove the inspection plug in the magneto
cover and
turn the
magneto
gear until
the chamfered
Figure
3-19.
Stall
Warning
Adjustment
tooth
on
the
distributor gear inside
the
magneto
aligns with
the white pointer as seen
through the
As a rule of
thumb,
moving
the
vane 1/4 inch will
opening.
change
the
time the
stall warning actuates by about
Without
allowing the
gear
to
turn
from
this position,
5 mph of indicated airspeed. The
only
way
to test
assemble
the
magneto with gasket on
the engine.
the
accuracy of
the
setting is
to
fly
the
airplane into
Secure magneto in place
with washers and nuts;
a
stall, noting
the
speed at
which
the
warning horn tighten
nuts only finger
tight.
and light come on and
the
speed
at
which
the
full
stall
occurs. The stall should
be made with
the
flaps
Fasten ground wire
of electric
timing
light
to
any
and
gear
up and power off. Prior
to
stalling deceler-
unpainted metallic portion of
the
engine,
and one of
ate no faster
than
one mph per
second. It
may be
the
positive
wires of
the timing
light
to
a suitable
necessary
to
make several
alternate adjustments and
terminal
connected
to
the
ground
terminal
connection
test flights
before
the
desired
setting can
be
reached.
of
the
right magneto.
Then
turn
the
engine
crankshaft
The stall warning
should
actuate,
ideally, at 7
to
9
several
degrees from
the
25°
BTC in direction
mph ahead
of
the
complete
stall, although from
5
to
opposite
to
that
of
normal
rotation.
10 mph ahead
of
the
complete stall
will meet
FAA
requirements. The switch setting should be checked
Turn on
the
switch
of
the timing
light.
The light
and adjusted as necessary
whenever
a
wing
or
wing
should be
lit. Turn
the
crankshaft very slowly
in
leading
edge is replaced
or extensively
repaired, or
direction of normal rotation until
the
mark on
the
3-33