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Taking about 15 seconds to complete, first-stage capture is restricted to orbital regions where ground controllers can monitor progress in near real time. To control spurious loads when the berthing element is large, the station Attitude Control System may be maintained in free-drift and crew exercise prohibited. [29]
Multiple techniques exist for preload control to ensure that the tension in the bolt is close to the one specified in the design (some bolt-to-bolt statistical variations are inevitable): [1] torque-controlled tightening is a simple and most popular approach: the fastener is tightened until the torque limit is reached.
Spine failure during 6G pitch-up at air show 1965-07-06 1965 Little Baldon Hastings accident: RAF Abingdon, Oxfordshire, United Kingdom Handley Page Hastings: Design flaw 41 Right-hand elevator became uncontrollable due to metal fatigue-related failure of two bolts in elevator system [9] 1966-03-05 BOAC Flight 911: Mount Fuji, Japan Boeing 707-436
The curve representing a clamped parts-to-bolt stiffness ratio of 0.01 shows that when the relative stiffness of the clamped parts is very low, almost all of the load is transferred to the bolt, down to the point where a compressive load equals the preload, and separation at the bolt head occurs, reducing the force in the bolt to zero.
Early on 1 August 2010, a failure in cooling Loop A (starboard side), one of two external cooling loops, left the station with only half of its normal cooling capacity and zero redundancy in some systems. [26] [27] [28] The problem appeared to be in the ammonia pump module that circulates the ammonia cooling fluid. Several subsystems, including ...
The commission found that the immediate cause of the Challenger accident was a failure in the O-rings sealing the aft field joint on the right solid rocket booster, causing pressurized hot gases and eventually flame to "blow by" the O-ring and contact the adjacent external tank, causing structural failure. The failure of the O-rings was ...
Now, the Secret Service and its director are under intense scrutiny over that “zero fail” mission following an assassination attempt on former President Donald Trump during a July 13 rally in ...
The definition of a closed loop control system according to the British Standards Institution is "a control system possessing monitoring feedback, the deviation signal formed as a result of this feedback being used to control the action of a final control element in such a way as to tend to reduce the deviation to zero." [2]