TM 1-1500-204-23-9Figure 8-26. Tightening to 60- or 120-Degree Wrench Arc(c)For 180 degree arc, turn wrench until handlepoints in opposite direction.b.PreloadindicatingWashers. The preloadindicating washer, shown in figure 8-29, consists of twoplain washers, one inner preload washer, and one outerpreload washer. The plain washers mash the innerpreload ring into the outer preload ring. When this hasoccurred, the nut or bolt is properly tightened (see figure8-30).(1)Installation of preload washer on stud. To installpreload washers on a stud, see figure 8-31 and proceedas follows:(a)Install plain washer.(b)Install inner preload washer.(c) Install outer preload washer.(d)Install plain washer.(2) Installation of preload washer on a bolt. Toinstall preload washers on a bolt, see figure 8-32.(3)Tightening. To tighten preload washers on astud or a bolt, see figure 8-33 and proceed as follows:NOTEAn aircraft inspector or supervisor may berequired to be present during tightening ofthe preload indicating washers to verifythat the preload washer has been properlytightened.(a)Place a ratchet handle wrench with socket onthe nut.(b)Place a scribe in one of the preload indicatingouter ring holes.(c) Move the preload ring with the scribe andtighten the nut. As soon as the preload washer can no8-14
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