Standard Practices - Airframe; Cherrylock Rivets, Removal - Piper APACHE PA-23-235 Service Manual

PIPER AZTEC SERVICE MANUAL
2-38. STANDARD PRACTICES - AIRFRAME. This general information pertains to
standard aircraft hardware installation and removal practices. The information included will
be very helpful if it is referred to on a regular basis.
For standard repair practices of a minor nature, refer to AC43.13.
If repairs dictate Non-Destructive Testing (N.D.T.) after repair such as welding,
magniflux should be used on materials made from 4130 steel such as engine mounts and seat
frames.
Testing and inspecting of aluminum castings and machined aluminum parts may be
accomplished by the dye penetrant method.
Usually, a good visual inspection with 10X magnifying glass will show any damage or
defect in a repair that is of a significant nature.
2-39. CHERRYLOCK
RIVETS, REMOVAL. (Refer to Figure 2-15.)
Should it be
necessary to remove an installed cherrylock rivet, the following procedures are recommended.
a. In thick material remove the lock by driving out the rivet stem. using a tapered steel
drift pin. (See View 1.)
NOTE
Do not drill completely through the rivet sleeve to remove a
rivet as this will tend to enlarge the hole.
b. If the rivets have been installed in thin sheets, driving out the locked stem may damage
the sheets. It is recommended that a small center drill be used to provide a guide for a larger
drill on top of the rivet stem, and the tapered portion of the stem be drilled away to destroy the
lock. (See Views 2 and 3.)
c. Pry the remainder of the locking collar out of the rivet head with the drift pin. (See
View 3.)
d. Drill nearly through the head of the rivet, using a drill the same size as the rivet shank.
(See View 4.)
e. Break off rivet head, using a drift pin as a pry. (See View 5.)
f. Drive out the remaining rivet shank with a pin having a diameter equal to the rivet
shank. (See View 6.)
HANDLING AND SERVICING
Reissued: 2/18/81
1D7