Cessna 172 Maintenance Manual page 39

(3) Drill nearly through the head of the rivet using a drill the same size as the rivet shank.
(4) Break off rivet head, using drift pin inserted into the drilled hole as a pry.
Drive out remaining rivet shank with a pin having a diameter equal to the rivet shank.
(5)
C. Installation of Blind Rivets.
(1) Refer to Figure 2, for an illustration of installation procedures.
(2) Check that rivet hole size and rivet are compatible.
(3) Check that proper pulling head is installed on rivet gun.
(4) Adjustment of pulling head must be made in accordance with manufacturers instructions.
(5) Check that proper operating air pressure is available to rivet gun.
NOTE:
(6) Check that holes in parts to be fastened are properly aligned.
(7) In blind clearance applications, check the minimum blind clearance (BK) dimension if the
manufactured head of blind rivet is protruding above the top sheet. The rivet will pull down the
sheet as the stem is pulled if the BK dimension is met or exceeded.
(8) The minimum blind clearance is the BK dimension, and is listed in the manufacturers standard
sheets.
NOTE:
(9) When placing pulling head on rivet stem, hold riveter and pulling head in line with axis of rivet
while holding tool in a light and flexible manner.
(10) When tool is actuated, pulling head will pull down and seat against rivet head.
(11) Clamping action will pull sheets together and seat rivet when tool is actuated.
(12) When tool is actuated, action of rivet will automatically assist in bringing tool and pulling head
into proper alignment with rivet axis.
NOTE:
(13) Hold tool in line with rivet as accurately as possible, and allow a steady but light pressure; pull
trigger and let the rivet align itself.
(14) When rivet is completely installed, release trigger and pulling head will eject pulling portion of
stem through forward end.
(15) Rivet must break within these limits.
Fastener
NAS1738 or NAS1739
Cherry Max
Cherry Max
(16) Protruding stems usually indicate incorrect grip length or oversize holes.
D. Loose or Working Blind Rivets.
(1) Blind rivets which are found to be loose or show evidence of working must be replaced with
rivets of like size and type. In some instances, it may be necessary to use the next larger size
rivet. Loose fasteners may be indicated by the following situation:
(a) The fastened material moves relative to the fastener. Skin deflection is evident.
CESSNA AIRCRAFT COMPANY
SINGLE ENGINE
STRUCTURAL REPAIR MANUAL
Blind rivets may be installed using pneumatic or mechanical guns, whichever is
available.
When installing a blind rivet (pull-type rivet) in a hole where the previous blind rivet
was removed by drilling and punching the rivet out, inspect the drilled hole to assure
all metal sheets are in place and not separated prior to pulling rivet. It may be
necessary to insert a stiff wire in adjacent hole to hold metal in position while pulling
rivet.
Pressing down with force will not allow rivet and tool to align themselves with hole
and could limit head setting of rivet, however, enough force to seat the head against
the skin is necessary.
Dash number
All
-4
-5, -6
© Cessna Aircraft Company
Stem Flushness
+0.010 or -0.020 inch
+0.010 or -0.015 inch
+0.010 or -0.020 inch
51-40-00
Page 8
Jun 1/2005