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Earlier in the day, the two airlines that use the aircraft in question, the Boeing 737 Max 9, reported loose bolts in the area of those plug doors, panels used in place of emergency exits that ...
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.
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 ...
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 ...
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 ...
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[4] [11] However, a spring washer will continue to hold the bolt against the substrate and maintain friction when loosened slightly, whereas a plain washer will not. [a] The benefit of spring lock washers lies in the trapezoidal shape of the washer. When compressed to loads near the proof strength of the bolt, it will twist and flatten.
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.