7 Myths About The Challenger Disaster

Lester67 writes "James Oberg at MSNBC has put together an excellent recap of the 7 myths surrounding the Challenger shuttle disaster. I remember that day clearly, but as the author points out, I didn't see it live, nor did a large chunk of the people said they did (Myth #1). Although there are no surprises on the list, regression may have caused you to forget a few of them (#3)."

Comments

Feynman's report

[19061969]

Obligatory link to Richard Feynman's report on the disaster.

The Challenger disaster was quite shocking, even more so when I realised that the crew were probably alive (if not conscious) all the way until their capsule hit the ground. It's incredible that something could survive that disintegration but very sad that there was no way to get the capsule safely back to earth.

Richard Feynman's report is a fantastically clear and lucid account of his opinions. The man was one of the greatest communicators of science, and after reading this, you will see why. The most astonishing bit is that he discusses some less than simple things in such a way as to make them easily understood. It's a model of clarity, and I recommend it.

Most interesting report

[gowen]

The most fascinating report on the Challenger disaster remains Richard Feynman's dissent on the official line of the Rogers Report (on whose committee he served). Read it here.

"If a reasonable launch schedule is to be maintained, engineering often cannot be done fast enough to keep up with the expectations of originally conservative certification criteria designed to guarantee a very safe vehicle. In these situations, subtly, and often with apparently logical arguments, the criteria are altered so that flights may still be certified in time. They therefore fly in a relatively unsafe condition, with a chance of failure of the order of a percent (it is difficult to be more accurate).

Official management, on the other hand, claims to believe the probability of failure is a thousand times less. One reason for this may be an attempt to assure the government of NASA perfection and success in order to ensure the supply of funds. The other may be that they sincerely believed it to be true, demonstrating an almost incredible lack of communication between themselves and their working engineers."

Whether you consider that "political interference" is a different matter.

Re:No explosion?

[FireFury03]

What kind of strange definition of explosion does this guy have?

A (low) explosion is basically an over-pressure of the inside of a sealed container to the point that it breaks catestrophically. (High explosives are obviously different). That's not what happened here - the fuel tank ruptured (not caused by an explosion) and the resulting fuel spill just burnt in the air. That's really no different to if your car fuel tank ruptures and the petrol catches fire, it doesn't explode it just burns. Similarly if you set fire to gun powder in an unconfined space it just burns (quickly), it doesn't explode.

The craft then broke apart due to overpressure on the *outside* of the craft (caused by it turning broad-side in a supersonic airstream). If anything that probably constitutes an implosion, certainly not an explosion.

Re:Copied straight from Wikipedia!

[Daikiki]

Other way around. The first paragraph of the article was copied into wikipedia in the last few hours. The article was published yesterday.

Obligatory Tufte-Link

[atrocious cowpat]

Edward Tufte wrote an excellent analysis on how crucial information about possible problems was buried in incompetently presented data.

Re:Sorry, but almost every point ....

[georgewilliamherbert]

Again we have semantics being put forth as fact. Most people would find little discrepancy between a person being subjected to violent trauma, going unconscious or into extreme shock, and dying within a minute and dying instantly. Nothing happens instantly anyway.

The crew were not subjected to particularly violent trauma from the breakup. Nor did the breakup knock them unconscious. All evidence available to us indicates that the cabin was generally intact, didn't get torn apart, wouldn't have tumbled violently enough to cause serious injury to properly strapped in seated astronauts. They went unconscious, we presume, because it had been damaged enough that the air leaked out, and they were at 65,000 feet by the time they started back down again, and you pass out if you breathe air at 65,000 foot pressure levels.

We don't know if everyone eventually passed out; the emergency air packs they had might have kept them conscious, and some of those were turned on. And they all might have woken back up on the way down as air pressure increased again. But we really don't know. The flight recorder stopped when the power went off in the breakup.

We know the breakup didn't kill them all, or knock them all unconscious, because if it had then they couldn't have turned on the air packs.

The design of the booster, while possessing flaws subject to improvement, was neither especially dangerous if operated properly, nor the result of political interference.

This statement is complete poppy-cock. Any rational person would recognise the inherent danger in strapping themselves to the side of an enormous tank of liquid oxygen and lighting it.

The LOX tank didn't kill anyone. And you don't light the LOX tank.

Jim was referring to the solid rocket boosters.

Replacement of the original asbestos-bearing putty in the booster seals was unrelated to the failure.

unrelated? surely this is the wrong word to use for a part that has been proven by more than one panel of highly respected scientists to be inherently flawed.

The putty seal problems existed before the change in materials was made. The problem was unrelated to that change happening. It is a myth that the problems appeared after the change.

Please read more carefully.

There were pressures on the flight schedule, but none of any recognizable political origin.

This is simply delusional, and requires no further comment

Claims were repeatedly made that the White House pushed on NASA to get them to launch in time for Reagan to do a live linkup chat as part of the State of the Union.

Phone logs, extensive interviews both with the White House staff and the NASA staff, repeated inquiries have shown that there is no factual evidence or ancedotal claim by anyone inside either the WH or the NASA program or its contractors that there was any such WH pressure.

If it happened, they erased all the evidence.

Things which are alledged and have no evidence are at best a myth or conspiracy theory. Calling it a myth, when it's been specifically repeatedly proven to have no factual evidence on the record anywhere, is a prefectly fair claim.

Your entire response seems to boil down to I believe these myths so they must be true!. The irony is astounding.

Of course there was politcal interference

[mbone]

I take exception to this one

There were pressures on the flight schedule, but none of any recognizable political origin.

BS. I worked at NASA at the time, and I knew that there were politcal pressures on the flight schedule before the launch. One thing that he conveniently doesn't mention is that the State of the Union address was that night. It is a fact that Reagan wanted to salute the first teacher in space. That was common knowledge. Only an idiot would think that the NASA higher-ups would not feel pressure to launch in those circumstances. (I never heard of any plans to link the flight crew to the speach, which I cannot recall being done for any SOTU with anyone; this sounds like a straw man to me).

What I will give him is that I personally doubt that this pressure took the form of the White House calling up Houston. (There is certainly no evidence of that.) But they didn't have to.

I was working there when it happened and saw it

[snub]

I worked as a contractor to NASA from STS-6 (well before Challenger) through the disaster and for several years afterward. I was an engineering manager on the payload side rather than the oribiter itself but I was heavily involved in all phases of prepration and launch. That qualifies me to say: this guy doesn't know what he's talking about.

There was enormous pressure to launch on time. Did the President call the Launch Director and tell him to launch? No, of course not. But NASA's budget depended on getting those launches off and beleive me that is a big motivator.

Did stupid managers ignore the advice of engineers? Not really. Remember that you're dealing with the "fog of war". Nobody knows anything 100% for sure and nobody communicates 100% perfectly. Incomplete data, poorly constructed PowerPoint slides, fear of rocking the boat, preconceived ideas, all contribute to this. Would someone intentionally put the astronauts lives at risk? Of course not, but in the absence of clear information most people just go with what the group wants to do.

Did the astronauts accept the risk? I knew many astronauts (OK actually it was 5 or 6) and they were some of the smartest people I have ever met. They TOTALLY accepted the risk of what they were doing. Just as much as a Marine going into battle accepts the risks. In this case though they were even more educated and aware of the odds. The astronauts I knew usually had multiple degrees, dozens of certifications, and 1000s of hours of training. They knew exactly what they were doing.

Re:I was working there when it happened and saw it

[GileadGreene]

That qualifies me to say: this guy doesn't know what he's talking about.

Uh, James Oberg worked in Mission Control at JSC from well before Challenger until well after. I'd say that qualifies him to "know what he's talking about", at least as much as you're qualified by your experiences.

I Was There And Saw It Live

[gmb61]

I was vacationing in Florida at the time and saw it live and in person. It was the first and only shuttle launch I've ever seen. It's true that although it looked like an explosion, it didn't really sound like one. It's kind of hard to describe what it sounded like, kind of like the sound of rushing air, not the boom of an explosion. What I remember most about that day was the bitter cold. I was born and raised in Southern California, and so I wasn't used to cold like that. I didn't have any gloves and I remember getting frostbite on my fingers while trying to hold my camera. I also remember the voice of the mission control announcer sounded very stressed as he first told us that they had "lost contact with the orbiter", then "rescue units are moving into position". They locked down Kennedy Space Center for one hour and nobody was allowed to enter or exit. I also remember watching all the little bits and pieces falling to Earth afterwards. Stuff was falling out of the sky for what seemed like half an hour. It looked a little like the very last shot in the movie Independence Day. I don't think I will ever forget that day.

Refutation of myth #1 is wrong

[fireboy1919]

You didn't need a TV. It should be noted that almost all shuttle launches are visible for most of Florida, and the sonic boom during reentry shakes the entire State. If you lived in Florida, you could see the smoke for hours. And it was common practice at most business, schools, and homes to go out an watch the shuttle take off.

I was six at the time. It was clearly visible from Central Florida, even though that's not where it happened. It was a BIG explosion.

So "everyone saw it" may be wrong, but "millions of people saw it" is certainly correct, and probably "almost everyone in Florida" saw it" is not necessarily wrong.

And it was obvious what happened. The small flame thing in the sky (which is all we actually see during shuttle launches) turned into much larger cloud of something.

The refutation of myth #2 is a bit questionable. Pieces went everywhere. They were found all over the place. And the size of the thing in the sky was big enough to be visible all over the state. Sure, there was no "bang," but it did explode.

What kind of car do you drive?!

[FatSean]

Every car I've ever owned in the USA had the gas tank under the trunk/boot. Several feet BEHIND the passenfer. I find it very hard to believe that the gas tank manages to get repositioned UNDER the passenger compartment before rupturing and burning. Most colissions from the rear compress the auto but do not fold it up. Neither do side impacts general distort the chassis such that the user is OVER the tank.

I think you are talking out of your ass. You have a point about saftey, but don't lie to get your point accross.

Re:composite aging?

[lbrandy]

Here for example is a story about some of the problems the USAF is running into now with the F-15 wing, which is composite and approaching 20 years old in many aircraft, e.g. the linked article notes an F-15 coming apart midflight in 2003 because of a sudden failure of the wing, and yet routine inspections every 200 hours had shown no signs of incipient failure.

Two points of information: The failure was not part of the wing, but part of the vertical stablizer (the fins). And, secondly, the failure was part of the load-bearing honeycomb, which is not "composite" but mainly aluminum. The 'skin' of the aircraft is composite, and not load-bearing. F15s are all getting structural upgrades (as is noted in the article) to correct this problem, and the air-force has removed the "profile" used that day (which, as i understand, was pretty extreme).

I worked at Eglin shortly after this happened, and worked with many people involved with that aircraft.

Re:Engineers bullied or bamboozled into acquiescen

[ednopantz]

More to the point, the engineers just weren't capable of expressing their concerns in a way that made sense to managers. The managers weren't stupid. They lacked domain knowledge and the engineers couldn't express what they knew in a way that made sense. When they tried charts, they made it worse.

  See Tufte's graphs:

badly excepted here: http://www.asktog.com/books/challengerExerpt.html

reviewed here http://www.statview.com/support/techsup/faq/Tufte/ tufte.shtml