Raytheon Beech Baron E55 - Page 446

Raytheon
Aircraft
tompany
BARON
55
AND
58
SHOP MANUAL
I
CAUTION
I
CAUTION
I
If
any
soft
spots
are
located in the
combustion
chamber and
radiator
assembly,
there
is
a
malfunc-
tion
in
the heater
system
and
a new
heater
should
be
installed
until the
trouble
has been
corrected.
b. Severe
overheating
will result in
general
weakening
of
the metal
that
results
in soft
and
spongy
spots.
These
are
usually
found
directly
opposite
the
crossover
passages.
They
can
be detected
by tapping lightly
with
a
ball
peen
hammer.
This
will
give
a
slightly
soft
or
spongy
response
in
contrast
to
a
solid feel when
tapping
on
live
metal.
These
soft
spots
will
usually
have
a
dull
gray appearance
indicating
considerable
surface oxidation.
The
presence
of
soft
spots
is
reason
for
rejecting
the
combustion
chamber
and
radiator
assembly.
RER~OVING
AND
INSTALLING
THE
CABIN
HEATER
a.
Remove
the nose cone
attaching
screws,
disconnect
the
taxi
light
wiring
on
airplanes
incorporating
the
optional
taxi
light
and
remove
the
nose cone.
b. Disconnect
the
iris valve control
and
blower
wiring.
Remove the
clamp
that
secures
the
blower
to
the
support
bracket.
c.
Remove
the
five bolts
that attach
the
iris
valve
to
the
fiberglass plenum
and
lift
the
blower and iris valve
from
the
plenum.
d. Disconnect
the
heater
ignition
lead
from
the
spark
plug
and
heater
ignitor.
e.
Disconnect
the
combustion
air
flexible
tubing
from
the
combustion
air
inlet
at
the
heater.
f.
Remove
the
fiberglass
plenum
from
the
heater
by removing
the
clamp
and
asbestos
strip.
g.
Disconnect
the
fuel
inlet
line from the
solenoid
in
the
nose
wheel
well
and
the
drain
line
at
the
heater
fuel
inlet.
h. Disconnect
the
heater
shroud
drain line in the
nose
wheel
well.
i.
Remove
the
clamp
securing
the
plenum
to
the
rear
of
the
heater.
j.
Remove
the
two
clamps
securing
the
heater
in
the
wheel well.
k.
Remove
the
eight
heater
attaching
bolts
that
secure
the
heater
supporting
ring
to
the
No.
1
bulkhead
and
re-
move
the heater
from
the
nose
section.
i.
Installation
is the
reverse
of
the
removal
procedure.
When
installing
the
heater
position
the
support
ring
and
gasket
so
that
the heater
exhaust extends
to
the
left
of
perpendicular
approximately
8".
m.
Make
certain
the
clamps
securing
the inlet
and
outlet
plenums
are
properly
positioned
to
prevent
damage
to
the
plenums.
I
n.
Use
sealer
(76,
Consumable
Materials
Chart,
Section
2)
as
required
when
reinstalling
the
iris
valve.
REnIlOVING
AND
INSTALLING
THE
CABIN
HEA TER
BLOWER
a.
Remove
the
nose cone
attaching
screws,
disconnect the taxi
light
wiring
on
airplanes
incorporating
the
optional
taxi
light
and
remove
the
nose
cone.
Jun
27/03SECTION
10
EZO