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Cessna 182 1978 - Rivets; Replacement of Hi-Shear Rivets; Substitution of Rivets; Repair of Glassfiber-Constructed Components

Cessna 182 1978
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MODEL
182
&
T182
SERIES
SERVICE
MANUAL
18-74A. FASTENERS.
Fasteners
used
in
the
aircraft
18-74D.
SUBSTITUTION
OF RIVETS.
are
generally
solid
aluminum
rivets,
blind
rivets,
and
a.
Solid-shank
rivets
(MS20426AD
and
MS20470AD).
steel-threaded
fasteners.
Usage
of
each
is
primarily
When
placing
rivets
in
installations
which
require
a
function
of the
loads
to
be
carried.
accessibility,
raised
head
rivets.
it
is
desirable
to
use
rivets
iden-
and
frequency
of
removal.
Rivets used
in
aircraft
tical
to
the
type of
rivet
removed.
Countersunk-head
construction
are
usually
fabricated
from
aluminum
rivets
(MS20426)
are
to
be
replaced
by
rivets
of
the
alloys.
In
special
cases,
monel,
corrosion-resistant
same
type
and
degree
of
countersink.
When
rivet
steel
and
mild
steel.
copper,
and
iron
rivets
are
used.
holes
become
enlarged.
deformed,
or
otherwise
damaged.
use
the
next
larger
size
rivet
as
a
replace-
18-74B.
RIVETS.
Standard
solid-shank
MS
rivets
ment.
Replacement
shall
not
be
made
with
rivets
of
are
those
generally
used
in
aircraft
construction.
lower
strength
material.
They
are
fabricated
in
the
following
head
types:
b.
Hi-shear
Rivets.
When
hi-shear
rivets
are
not
roundhead,
flathead,
countersunk
head.
and
brazier
available,
replacement
of
sizes
3/16-inch
or
greater
head.
Flathead
rivets
are generally
used
in
the
air-
rivets
shall
be
made
with
bolts
of
equal
or
greater
craft
interior
where
head
clearance
is
required.
strength
than
the
rivet
being
replaced.
and
with
self-
MS20426
countersunk
head
rivets
are
used
on
the
locking
nuts
of
the
same
diameter.
exterior
surfaces
of
the
aircraft
to
minimize
turbu-
c.
The
following
pages contain
approved
solid-shank
lent
airflow.
MS20470
brazier
head
rivets
are
used
and
hi-shear
rivet
substitutions.
on
the
exterior
surfaces
of
the
aircraft
where
strength
requirements
necessitate
a
stronger
rivet
head
than 18-75.
REPAIR
OF
GLASSFIBER-CONSTRUCTED
that
of
the
countersunk
head
rivet.
Both
the
brazier
COMPONENTS.
head
and
the countersunk
head
rivets
are
used
on
the
exterior
of
the
aircraft
where
head
clearance
is
re-
18-76.
Glass
fiber-constructed
components
on
the
quired.
Hi-shear
rivets
are
special,
patented
rivets
aircraft
may
be
repaired
as
stipulated
in
instructions
having
a
hi-shear
strength
equivalent
to
that
of
stan-
furnished
in
Service
Kit
SK182-12.
Observe
the
resin
dardAN
bolts.
They
are
used
in
special cases
in
manufacturer's
recommendations
concerning
mixing
locations
where
hi-shear
loads
are
present,
such
as
and
application of
the
resin.
Epoxy
resins
are
pref-
in
spars.
wings.
and
in
heavy
bulkhead
ribs.
This
erable
for
making
repairs,
since
epoxy
compounds
rivet
consists
of
a
cadmium-plated
pin
of
alloy
steel.
are
usually
more
stable
and
predictable
than
poly-
Some
have
a
collar
of
aluminum
alloy.
Some
of
these
ester
and
give
better
adhesion.
In
addition,
repair
rivets
can
be
readily
identified
by
the
presence
of
the
kits
are
also
available
for
the repair
of
cracks
in
attached
collar
in
place
of
the
formed
head
on
stan-
ABS,
PBC,
PVPC,
graphite
and
fiberglass material.
dard
rivets.
Blind
rivets
are
used, where
strength
These
kits
P/N's
51543
thru
51548
are
available
from
requirements
permit.
where
one
side
of
the
structure
the
Cessna
Supply
Division.
is
inaccessible,
making
it
impossible
or
impractical
to
drive
standard
solid-shank
rivets.
18-76.
CORROSION
AND
CORROSION
CONTROL.
18-74C.
REPLACEMENT
OF
HI-SHEAR
RIVETS.
NOTE
Replacement
of
hi-shear
rivets
with
close-tolerance
bolts
or
other
commercial
fasteners
of
equivalent
For
information
on
corrosion
and
corrosion
strength
properties
is
permissible.
Holes
must
not
control
for
aircraft refer
to
FAA
Advisory
be
elongated,
and
the
hi-shear
substitute
must
be
a
Circular
AC43-4.
smooth.
push-fit.
Field
replacement
of
main
landing
gear
forgings
on
bulkheads
may
be
accomplished
by
using
the
following
fasteners.
a.
NAS464P-*
bolt,
MS21042-*
nut
and
AN960-*
washer
in
place
of
Hi-shear
rivets
for
forgings
with
machined
flat
surfaces
around
attachment
holes.
b.
NAS464P-*
bolt,
ESNA2925-*mating
base
washer
and
ESNA
RM52LH2935-*
self-aligning
nut
for
forgings
(with
draft
angle
of
up
to
a
maximum
of
8°)
without
machined
flat
surfaces
around
attachment
holes.
*Dash
numbers
to
be
determined
according
to
the
size
of
the
holes
and
the
grip
lengths
required.
Bolt
grip
length
should
be
chosen
so
that
no
threads
remain
in
the
bearing
area.
18-6

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