Cessna 177 SERIES Service Manual

SECTION 14
UTILITY
SYSTEMS
Page No.
TABLE
OF CONTENTS
Aerofiche/Manual
UTILITY
SYSTEMS
.........
1. L9/14-1
Trouble
Shooting
.......
1L14/14-6
Heating
Systems
.....
....
1L9/14-1
Removal,
Repair
and
Description
.1......
. 1L9/14-1
Installation
........
1L14/14-6
Operation
..........
1L9/14-1
Ventilation
Systems
. .......
1L14/14-6
Trouble
Shooting
...
. 1L9/14-1
Description
....
1L14/14-6
Removal,
Repair
and
Operation
..
. . ..
.
1L14/14-6
Installation
...
....
1L9/14-1
Trouble
Shooting
.......
1L14/14-6
Defroster
Systems
........
1L14/14-6
Removal,
Repair
and
Description
.
...
. .
1L14/14-6
Installation
.......
1L14/14-6
Operation
. .
. . .
. .L14/14-6
14-1.
UTILITY
SYSTEMS.
controls.
damaged
air
ducting.
or defects
in
the ex-
-haust
muffler. In
most cases,
valves or
controls
can
14-2.
HEATING
SYSTEM.
be freed
by proper
lubrication.
Damaged
or
broken
parts
must be
repaired
or replaced.
When checking
14-3.
DESCRIPTION.
The heating
system
is
corn-
controls,
ensure
valves
respond
freely
to control
prised
of the
heat
exchange
section
of the
exhaust
movement,
that they
move
in the correct
direction
muffler,
a mixing
airbox
with
shut-off
valve
on
the
and
that
they move
through
their full
range
of travel
forward
side of
the firewall,
a push-pull
control
on
and
seal properly.
Check
that
hose are
properly
se-
the
instrument
panel,
outlets
and
flexible
ducting
cured
and replace
hose
that
are burned,
frayed.
or
connecting
the system.
crushed.
If fumes
are detected
in the cabin,
a thor-
ough
inspection
of the
exhaust
system
should
be ac-
14-4.
OPERATION.
Ram air
is ducted
through
an
complished.
Refer
to applicable
paragraph
in Section
engine
baffle inlet
and
heat exchange
section
of the
11
for this
inspection.
Since any
holes
or cracks
exhaust
muffler,
to a
mixing airbox
on
the forward
may permit
exhaust
fumes
to enter
the cabin,
re-
side of
the firewall.
Unheated
ram air,
routed
placement
of defective
parts is
imperative
because
through
a duct
connected
to a vertical
engine
baffle,
fumes
constitute
an
extreme
danger.
Seal any
gaps
is also
ducted
to this
airbox.
The airbox
valve
pro-
in heater
ducts
across
the firewall
with
Pro-Seal
vides an
operation
in which
the first
one inch
of
700
(Coast
Pro-Seal
Co., Chemical
Division,
Los
travel
of the "CABIN
AIR/HEAT"
control
results in
Angeles,
California)
compound
or equivalent
com-
varying
degrees of
fresh air flow.
A detent is
pro-
pound.
vided
on the mixing
valve at the
full unheated
fresh
air
position.
As the control
is
pulled out
past the
de-
14-6. REMOVAL,
REPAIR
AND INSTALLATION.
tent position,
further
extension
of
the control
results
Figure
14-1
illustrates
the heating
and
defrosting
in mixing
of increased
quantities
of heated
air.
Pull-
systems
and may
be used
as a guide
during
removal,
ing the
control
full out
provides
maximum
flow
and
installation
and
repair
of heating
system
components.
heated
air.
From
the mixing
airbox,
air
flows into
a
Burned,
frayed
or crushed
hose should
be
replaced
duct
across
the aft
side of
the firewall
where
it
is dis-
with
new hose,
cut to
length
and installed
in
the orig-
tributed
into the cabin.
inal
routing.
Trim hose
winding
shorter
than the
hose
to allow
clamps
to be
fitted.
Defective
air
valves
14-5.
TROUBLE
SHOOTING.
Most
of the
opera-
must
be repaired
or
replaced.
Check for
proper
op-
tional
troubles
in the
heating
and defrosting
systems
eration
of valves
and their
controls
after
repair
or
are caused
by sticking
or
binding valves
or their
replacement.
Change 7 14-1

Cessna 177 SERIES Specifications

General

Manufacturer	Cessna
Engine Type	Piston
Wingspan	35 ft 6 in (10.82 m)
Seating Capacity	4
Number Built	4, 295
Engine	Lycoming O-360
Horsepower	180 hp
Maximum Takeoff Weight	2, 500 lb (1, 134 kg)