Downward pressure on the spider presses down on the head of the fuze, breaks a shear pin, and inverts a belleville spring, flipping the striker downwards into a stab sensitive detonator, triggering the mine.
32.
As this happens, a garter spring in the isolation plug moves a steel shear pin into a groove on the sealing prong, and an 0-ring on the internal prong seals to isolate the tubing below the sliding sleeve.
33.
"My advice, " said Herschberger, " is to take extra shear pins for the prop ( shear pins hold the propeller in place and are designed to shear off in the event it hits an obstruction ) and extra spark plugs.
34.
"My advice, " said Herschberger, " is to take extra shear pins for the prop ( shear pins hold the propeller in place and are designed to shear off in the event it hits an obstruction ) and extra spark plugs.
35.
Shear pins and other such sacrificial devices are design elements that protect systems against stress applied in undesired manners to relieve it so as to prevent more extensive damage to the entire system, a practical engineering application of Le Chatelier's principle.
36.
The design may be such that the shear pin will have several different causes of failure towbar rotation about its long axis, sudden braking or acceleration, excessive steering force, etc . all of which could otherwise be extremely damaging to the aircraft.
37.
Another use is in pushback bars used for large aircraft . In this device, shear pins are frequently used to connect the " head " of the towbar the portion that attaches to the aircraft to the main shaft of the towbar.
38.
If material fatigue were to weaken a shear pin, the pin could potentially be broken by a force smaller than the original threshold force causing the mechanism to operate unintentionally, or a safety shear pin to break during normal operation of the machinery it protects.
39.
If material fatigue were to weaken a shear pin, the pin could potentially be broken by a force smaller than the original threshold force causing the mechanism to operate unintentionally, or a safety shear pin to break during normal operation of the machinery it protects.
40.
The September 1992 crash wasn't the helicopter's only incident involving BUCS . Records from the Army Safety Center show that on Jan . 29, 1992, one of the shear pins designed to break during an emergency and activate BUCS accidentally broke while the helicopter was on the ground.
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