stud clockwise one-fourth turn engages the insert.
Continued rotation screws the insert in and tightens
the fastener. Turning the stud one-fourth turn
counterclockwise will release the stud, but will not
screw the insert out far enough to permit
re-engagement. The stud should be turned at least
one-half turn counterclockwise to reset the insert.
AIRLOC FASTENERS.—Figure 2-11 shows
the parts that make up an Airloc fastener. The Airloc
fastener also consists of a receptacle, a stud, and a
cross pin. The stud is attached to the access panel and
is held in place by the cross pin. The receptacle is
riveted to the access panel frame.
Two types of Airloc receptacles are available: the
fixed (view A) and the floating (view B). The floating
receptacle makes for easier alignment of the stud in
the receptacle.
Several types of studs are also
available, but in each instance the stud and cross pin
come as separate units so the stud may be easily
installed in the access panel.
The Airloc receptacle is fastened to the inner
surface of the access panel frame by two rivets. The
rivet heads must be flush with the outer surface of the
panel frame. When you are replacing receptacles,
drill out the two old rivets and attach the new
receptacle by flush riveting. Be careful not to mar the
sheet. When you are inserting the stud and cross pin,
insert the stud through the access panel and, by using
a special hand tool, insert the cross pin in the stud.
Cross pins can be removed by means of special
ejector pliers.
DZUS FASTENERS.—DZUS fasteners are
available in two types. A light-duty type is used on
box covers, access hole covers, and lightweight
fairings. The heavy-duty type is used on cowling and
heavy fairings. The main difference between the two
Dzus fasteners is a grommet, which is only used on
Figure 2-11.—Airloc fastener.
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