Raytheon Beech Baron E55 - Page 555

BARON
55
AND
58
SHOP
MANUAL
panel
forward
ofthe
pilots
seat,
may
be
opened
to
CLEANING
THE
STATIC
AIR
SYSTEIM
I
(Figure
11-41
TESTING
THE
PITOT
SYSTEM
FOR
NOTE
LEAKS
On
airplane
serials
TC-1403
and
after,
A
functional
test
of the
pitot
system
can
be
made
by
TE-847
and
after
and
TH-1
and
after,
using
an
observer
in
the
cabin
to
watch the
airspeed
the
aluminum
static
lines
are
replaced
indicator
while air
pressure
is built
up
artificially by
with
Poly-fro
tubing.
using
a
section of soft
rubber
tubing
as
follows:
Blow low
pressure
air
through
the
lines
from the
dis-
a.
Clamp
the
rubber
tubing
over
the
pitot
head
inlet,
connected
line
at
the
airspeed
indicator
to
the
static
making
certain that
the
connection
is air
tight,
ports.
Cover
each static
port
separately
when
blowing
to
insure
that
each
line
is
clear. Instrument
error
or
b.
Crimp
the
end
of
the
tubing
and
slowly
roll
it
up
possible
damage
could
result
if
even
one
port
is
until the
airspeed
indicator
registers
approximately
clogged
with
dirt
or
foreign
matter.
100
miles
per
hour.
~L1
CAUTION
CAUTION
Never
blow
air
through
the line toward
To
avoid
rupturing
the
diaphragm
of
the
the
instrument
panel;
to
do
so
will sen’-
airspeed
indicator,
roll
up
the
rubber tub-
ously damage
the
instruments.
When
ing
slowly
and do
not
build
up
excessive
blowing
back
through
the
line from the
pressure
in the
line.
instrument
panel,
make
sure
that
no
air
c.
Secure the
rolled
up
tubing
so
that
it
will hold
the
is blown
into the
instruments.
airspeed
indicator
reading.
d.
If
there
is
no
decline
in
the
reading
after several
minutes,
there
is
no
leak
in
the
pitot
system.
NOTE
e.
If
a
decline
in the
reading
of
the
airspeed
indicator
Wax
or
polish
applied
to
the
static
air
is
observed,
check
the
pitot
system
plumbing
for
leaky
buttons
can
cause
wrong
instrument
hoses
and loose
connections.
readings.
The
static
air buttons
should
be
cleaned
periodically
with
a
cleaning
1
u~uno-1
the static
air
buttons.
solvent
to
insure
that
no
film
exists
on
CAUTION
Release
the
air
pressure
slowly
by
To drain
the static
air line
on
serials
TC-1 thru
TC-954,
unrolling
the
rubber
tubing,.
a
sudden
remove
one
end of the
hose
which forms
the static air
release
of the
air
pressure
may
damage
line
drain
on
the
left side
panel
near
the
aft bulkhead
the
airspeed
indicator,
and
permit
the
system
to
drain.
On serials
TC-955 and
after,
TE-1
and
after
and
TH-1 and
after,
the static air
INSPECTING
THE
PITOT
SYSTEM
HOSE
line
is
drained
at
the
emergency
static
air
source
by
turning
the
knob
to
the
emergency
static
air
source
After
the
pitot
system
is
checked
for
leaks,
inspect
the
position.
Return
the knob
to
normal
position
after
the
hose
sections
for
signs
of
deterioration.
Check
all
line
is
completely
drained.
polyethylene
tubing
for
hardness
or
brittleness.
Rub-
ber
hoses
on
which
outer
surfaces
have
checked
or
cracked,
particularly
at
the
bends
or
connecting
Frequent
drainage
of
the
static
air
line
is
recom-
points,
or
which
have
become
hard,
should be
mended
when
humidity
is
high
or
when
heavy
dew
is
replaced. Replace
the
defective
hose
with
Poly-flo
experienced.
The line
should
also
be
drained each
tubing.
When
the
new
tubing
is
installed,
recheck
the
time
the
airplane
is flown
through
heavy
rain
or
washed
down.
pitot
system
for leaks
using
the
preceding
procedure.
515
11-75