Good point about asking dumb questions, MBlazer. For that to happen, a certain attitude is needed at the top -- one that welcomes all kinds of questions, not just those that sound intelligent but may, in fact, be worthless.
This story reminds me of a physics professor that refused to give partial credit on complex problems. His reasoning was that in real life even tiny mistakes like an errant punch slug can have disastrous consequences. We as engineering students had to learn that there is no almost wrong or almost right.
The problem described would have been in the autopilot system, not the primary flight controls. As kenish correctly notes, C-130's have hydraulically-booseted manual controls, not fly-by-wire. The Functionl Check Flight crew would not have the autopilot engaged during takeoff, but could have had an unexpected surprise when they engaged the autopilot in flight. However, they could have quickly disengaged the autopilot, and most autopilots have clutches that will allow the crew to overpower the autopilot inputs with the cockpit controls.
TJ, the metallic sliver was likely introduced by drilling of the structure near the harness, which introduced shavings into the harness that were not properly cleaned up. Have seen this several times. You would be shocked at the lack of QA at some of the military overhaul depots. One major depot that one of my aircraft went through had no independant inspection. They relied on the technician performing the work to inspect his own work (all in the interest of cost savings).
I always preflight my plane, truck and motorcycle. On the C-130 in the article a preflight probably would not have found the problem. The elevator isn't visible from the cockpit, so "Flight Controls Free and Correct" would not help. The first sign of trouble would have been at gear retraction as the author pointed out.
I do wonder a bit on the veracity....the flight controls in a C-130 "Herky Bird" are mechanical...pushrods, bellcranks, cables, and pulleys. AFAIK even the latest "J" version is not fly-by-wire.
After reading the story I don't believe that Lockheed designed a single point failure mode of the primary flight control system. All aircraft are designed with redundancy based on risk. Flight control failure though low in risk is high in severity and thus qualifies for redundancy.
The longer I am in engineering, the longer I realize intuition is as important as math and numbers. Learning to listen to your intuition is as important as learning theories. There are so many interactions in a system, is impossible for anyone to systematically troubleshoot. Sometime when you are faced with a problem, is best to stand back and ask yourself what do you think. What does your little voice tell you.
Good points - I agree it is always more convincing to show than tell. We as engineers are often too busy to spend the time to figure out how to show - it's not always easy. But definitely worth it - especially when it comes to mission critical issues.
Earlier this year paralyzed IndyCar drive Sam Schmidt did the seemingly impossible -- opening the qualifying rounds at Indy by driving a modified Corvette C7 Stingray around the Indianapolis Motor Speedway.
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Last week, the bill for reforming chemical regulation, the TSCA Modernization Act of 2015, passed the House. If it or a similar bill becomes law, the effects on cost and availability of adhesives and plastics incorporating these substances are not yet clear.
This year, Design News is getting a head start on the Fourth of July celebration. In honor of our country and its legacy of engineering innovation -- in all of its forms -- we are taking you on an alphabetical tour through all 50 states to showcase interesting engineering breakthroughs and historically significant events.
Focus on Fundamentals consists of 45-minute on-line classes that cover a host of technologies. You learn without leaving the comfort of your desk. All classes are taught by subject-matter experts and all are archived. So if you can't attend live, attend at your convenience.