CESSNA AIRCRAFT
COMPANY
SINGLE ENGINE
STRUCTURAL REPA
IR MANUAL
shank will turn with the drill and cause a tear. The rivet head will often break away and climb the
drill, which is a good signal to withdraw the drill. If the rivet head does not come lose of its own
accord, inser
t a drift punch into the hole and twist slightly to either side until the head comes off.
(4) Drive out the shank of the rivet with a drift punch slightly smaller than the diameter of the shank.
On thin metal or unsupported structures, support the sheet with a bucking bar while driving out
the shank. If t
he shank is exceptionally tight after the rivet head is removed, drill the rivet about
two-thirds of the way through the thickness of the material and then drive out the remainder of
the rivet with a drift punch.
(5) The removal o
f flush rivets is the same as that just described except that no filing of the
manufactured head is required before center punching. Be very careful to avoid elongation
of the dimpled or the countersunk holes. The rivet head should be drilled to approximately
one-half the
thickness of the top sheet.
Table 1. Approved Replacement Fasteners Chart
REPLACE Inch thickness (or thicker)
WITH
MS20470AD3
0.025
NAS1398B4, NAS1398D4
0.020 NAS1738B4, NAS1738D4
MS20470AD
4 0.050
NAS1398B4
, NAS1398D5
0.040
NAS1398B5, NAS1398D5,
NAS9301B5, NAS1738B4,
NAS1738E4, NAS1738D4,
NAS9301B4
0.032
NAS1738B5, NAS1738E5,
NAS1738D
5, NAS9301B5
MS20470AD5
0.063
NAS1398B5, NAS1398D5
0.050
NAS1398B6, NAS1398D6,
NAS1738B
5, NAS1738E5,
CR3213-5
0.040 NAS1738B6, NAS1738E6,
NAS1738D5, CR3213-6
MS20470AD6
0.080
NAS1398B6, NAS1398D6
0.071 NAS1398D6
0.063
NAS173
8B6, NAS1738E6,
NAS1738D, CR3213-6
MS20426AD3 (Countersunk)
(Refer to Note 1)
0.063 NAS1398B4, NAS1399D4
0.040
NAS1739D4
MS20426AD4 (Countersunk) 0.080 NAS1399B4, NAS1399D4,
CR3213-4
0.050
NAS1739D4
MS20426AD4 (Dimpled) 0.063 NAS1739B4, NAS1739E4
51-40-00 Page 3
© Cessna Aircraft Company Jun 1/2005
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