Cessna 172 Skyhawk SERIES, Руководство по обслуживанию

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CESSNA AIRCRAFT COMPANY
SINGLE ENGINE
STRUCTURAL REPAIR 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, insert 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 the 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 of fl ush rivets is the same as that just described except that no fi ling 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
MS20470AD4 0.050 NAS1398B4, NAS1398D5
0.040 NAS1398B5, NAS1398D5,
NAS9301B5, NAS1738B4,
NAS1738E4, NAS1738D4,
NAS9301B4
0.032 NAS1738B5, NAS1738E5,
NAS1738D5, NAS9301B5
MS20470AD5
0.063
NAS1398B5, NAS1398D5
0.050
NAS1398B6, NAS1398D6,
NAS1738B5, NAS1738E5,
CR3213-5
0.040 NAS1738B6, NAS1738E6,
NAS1738D5, CR3213-6
MS20470AD6 0.080 NAS1398B6, NAS1398D6
0.071 NAS1398D6
0.063 NAS1738B6, 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
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© Cessna Aircraft Company
Jun 1/2005