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For example, if a standard automotive bolt in the U.S. is being secured, then the safety wire when installed should put tension on the bolt in a clockwise direction, since that is the direction that the bolt turns to tighten. [7] When drilling a fastener, the choice of where to drill it depends on the type of fastener and to what it will be wired.
Amid statements from airlines that their technicians found loose bolts on the same model of Boeing plane involved in a midair emergency, federal officials indicated an increasing focus on the ...
Bolt preload can also be controlled by torquing the bolt to the point of yielding. Under some circumstances, a skilled operator can feel the drop off of the work required to turn the torque wrench as the material of the bolt begins to yield. At that point the bolt has a preload determined by the bolt area and the yield strength of the bolt ...
It is therefore beneficial in high-frequency high-load situations with a higher risk of fatigue related failure, like a bolted down cylinder head, to use torque to yield bolts. [ citation needed ] The torque applied to the fastener must be determined such that it does not contribute to a service condition where the fastener enters a low-cycle ...
Both United Airlines and Alaska Airlines say they have found multiple loose parts on Boeing 737 Max 9 aircraft that were grounded in the wake of an alarming incident involving a window blowing out ...
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A plain washer and a spring washer are placed on a bolt between the nut (on the threaded end) and the bolt head. The American National Standards Institute (ANSI) provides standards for general use flat washers. Type A is a series of steel washers at broad tolerances, where precision is not critical.
Alaska Airlines CEO Ben Minicucci revealed the carrier found “some loose bolts on many” Boeing 737 Max 9s in an interview for “NBC Nightly News with Lester Holt” scheduled to air Tuesday.