AIRLOC FASTENERS

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. 2-8