Piper Cherokee Six - Page 85

PIPER
CHEROKEE
SIX
SERVICE
MANUAL
-INSPECT
FOR
CRACKS
IN THESE
AREAS
INSPECT
FOR
CRACKS
IN
THIS
Figure
3-1.
Typical
Muffler
Fatigue
Areas
Removal
of
the
tail
pipe
and
stacks
is
required
for
inspection
of
the
muffler
baffle.
Remove
or
loosen
all
exhaust
shields,
carburetor
and
cabin
heat
muffs,
shrouds,
heat
blankets,
etc.,
as
required
to
permit
inspection
of
the
complete
system.
Perform
the
necessary
cleaning
operations
and
inspect
all
external
surfaces
for
dents,
cracks
and
missing
parts.
Pay
particular
attention
to
welds,
clamps,
supports
and
support
attachment
lugs,
slip
joints,
stack
flanges
and
gaskets.
Inspect
internal
baffle
or
diffusers.
Any
cracks,
warpage
or
severe
oxidation
are
cause
for
replacement
of
the
muffler.
If
any
component
is
inaccessible
for
a
thorough
visual
inspection,
accomplish
one
of
the
following:
a.
Accomplish
a
submerged
pressure
check
of
the
muffler
and
exhaust
stack
at
2
psi
air
pressure.
b.
Conduct
a
ground
test
using
a
carbon
monoxide
indicator
by
heading
the
airplane
into
the
wind,
warming
the
engine
on
the
ground,
advancing
the
throttle
to
full
static
RPM
with
cabin
heat
valves
open,
and
taking
readings
of
the
heated
airstream
inside
the
cabin
at
each
outlet
(including
rear
seat
heat
outlet,
if
installed).
Appropriate
sampling
procedures
applicable
to
the
particular
indicator
must
be
followed.
If
carbon
monoxide
concentration
exceeds
.005
percent
or
if
a
dangerous
reading
is
obtained
on
an
indicator
not
calibrated
in
percentages,
the
muffler
must
be
replaced.
INSPECTION
Issued:
8/17/72
1D13