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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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