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Cessna 150M - Utility Systems

Cessna 150M
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SECTION
14
UTILITY SYSTEMS
TABLE
OF
CONTENTS
UTILITY SYSTEMS .
Heating
System.
Description
Operation
.
Trouble
Shooting
Removal,
Installation
and
Repair.
Defroster
System.
Description
. . . . . . . . . .
14-1.
UTILITY SYSTEMS.
14-2.
HEATING SYSTEM.
Page
14-1
14-1
14-1
14-1
14-1
14-1
14-3
14-3
14-3.
DESCRIPTION. The
heating
system
is
com-
prised
of
the
heat
exchange
section
of
the
exhaust
muffler,
a
shut-off
valve,
mounted
on
the
right
for-
ward
side
of the
firewall,
a
push-pull
control
on the
instrument
panel,
outlets,
and
flexible
ducting con-
necting
the
system.
14-4.
OPERATION.
Ram
air
is
ducted
through
an
engine baffle
inlet
and
heat
exchange
section
of the
exhaust
muffler,
to
the
shut-off
valve
at
the
firewall.
The
heated
air
flows
from
the
shut-off
valve into a
duct
across
the
aft
side
of
the
firewall,
where
it
is
distributed
into
the
cabin.
The
shut-off
valve
oper-
ated
by a
push-pull
control
marked
"CABIN HEAT, "
located
on
the
instrument
panel,
regulates
the
vol-
ume
of
heated
air
entering
the
system.
Pulling
the
control
full
out
supplies
maximum
flow, and
pushing
control
in
gradually
decreases
flow,
shutting
off
flow
completely
when the
control
is
pushed
full
in.
14-5. TROUBLE SHOOTING.
Most
of the
operation-
al
troubles
in
the
heating,
defrosting,
and
ventilating
systems
are
caused
by
sticking
or
binding
air
valves
and
their
controls,
damaged
air
ducting,
or
defects
in
the
exhaust
muffler.
In
most
cases,
valves
or
controls
can
be
freed
by
proper
lubrication.
Dam-
Operation.
.
........
.
Trouble
Shooting . . . . . . . .
Removal,
Installation
and
Repair.
Ventilating
System
Description
. .
Operation
...
Trouble
Shooting
Removal,
Installation
and
Repair.
14-3
14-3
14-3
14-3
14-3
14-3
14-3
14-3
aged
or
broken
parts
must
be
repaired
or
replaced.
When checking
controls,
ensure
valves
respond
freely
to
control
movement,
that
they move
in
the
correct
direction,
and
that
they move
through
their
full
range
of
travel
and
seal
properly.
Check
that
hose
are
properly
secured,
and
replace
hose
that
are
burned,
frayed
or
crushed.
If
fumes
are
de-
tected
in
the cabin, a thorough
inspection
of the
ex-
haust
system
should
be
accomplished.
Refer
to ap-
plicable
paragraph
in
Section
11
for
this
inspection.
Since any holes
or
cracks
may
permit
exhaust
fumes
to
enter
the
cabin,
replacement
of
defective
parts
is
imperative
because
fumes
constitute
an
extreme
danger.
Seal
any
gaps
in
shut-off
valves
at
the
fire-
wall
with
Pro-Seal
#700 (Co1st
Pro-Seal
Co.,
Los
Angeles,
California)
compound,
or
equivalent
com-
pound.
14-6.
REMOVAL, INSTALLATION
AND
REPAIR.
Figure
14-1
illustrates
the heating,
defrosting,
and
ventilating
systems,
and
may
be
used
as
a guide
dur-
ing
removal,
installation
and
repair
of
heating
sys-
tem
components.
Burned,
frayed,
or
crushed
hose
must
be
replaced
with new hose,
cut
to
length and
installed
in
the
original
routing.
Trim
hose winding
shorter
than
the
hose
to allow
clamps
to
be
fitted.
Defective
air
valves
must
be
repaired
or
replaced.
Check
for
proper
operation
of
valves
and
their
con-
trols
after
repair
or
replacement.
14-1

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