FAA Advisory Circular 43.13-1B
Acceptable Methods, Techniques, and Practices
Aircraft Inspection and Repair
AC 43.13-1B | 7. Aircraft Hardware, Control Cables, and Turnbuckles | 2. Screws | 7-19. Wood Screws
AC 43.13-1B
9/8/98
nonstructural parts. Self-tapping sheet metal
screws (AN504, AN530, AN531 and NAS548)
may be used in blind applications for the tem
porary attachment of sheet metal for riveting
and the permanent assembly of nonstructural
assemblies. The MS21318 is a roundhead
drive screw used in the attachment of name
plates or in sealing drain holes, and is not in
tended to be removed after installation. They
are normally installed by driving the screw into
a drilled hole with a hammer.
CAUTION: Self-tapping screws
should never be used as a replacement
for standard screws, nuts, bolts, or
rivets in any aircraft structure.
7-19. WOOD SCREWS AN545 and
AN550, MS35492 and MS35493 are screws
used in wood structures of aircraft.
7-20.7-33. [RESERVED.]
Page 7-4
Par 7-18