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#51
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![]() "Dan Luke" c172rgATbellsouthDOTnet wrote in message ... "John Aldrich" wrote: The problem with this argument is that everybody thinks they are a good driver/pilot. I think hours flown to accidents/incidents is as good an indicator as any. 2000+hours, no accidents, no incidents. Perhaps you are a far above average pilot, but that anecdote does nothing to prove that you are safer flying than driving. My Uncle Wilson smoked cigars every day of his adult life - and inhaled. He lived to be 93 years old. Does that prove smoking is safe? Cigars only have a 20% higher incidence of cancer than non-smokers, as opposed to a 2000% higher risk for cigarettes. Adjusting your perception of how safe flying is has already improved the statistics. Not nearly to the percentage that FAA/EAA co-operation has, but there is nearly a 3 dB improvement. John P. Tarver, MS/PE |
#52
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"Marten Kemp" wrote in message
... Well, I admit that I *was* being a bit condescending in my original question {said he, in a slightly abashed tone of voice}, but in my defense I *did* find the statement amazing. My internal assumptions database has subsequently been reloaded with the updated data. I also admit that "opprobrium" wasn't the right word; I really meant "obolquy" (though "calumny" comes close). I tend to use large words and be snottily patronizing because I've never been good at constructing wounding personal attacks while using the vernacular. (I also seem not to be able to type at the moment. The number of t7pos has been positively amazing. Time for more coffee.) Martin, nobody likes to be outclassed by somebody who can take criticism so honorably. In fact, I find your integrity offensive. It's just selfish of you, to deny me my righteous flaming. This is Usenet, dammit! I was pretty rude. Come on! Let me have it! Don't leave me down here in the gutter alone. -Jonathan |
#53
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"Tarver Engineering" wrote in message
... I can immagine the two women argueing the entire trip, as one of them made them late by going shopping. That can't be good for situational awareness, or concentration. Point taken. I'm not sure I could look at the gauges with two hot chicks engaged in a sprawling cat fight in my airplane. Maybe a flung shoe switched off the autopilot while John was trying to take pictures. |
#54
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![]() After havng read hundreds of NTSB accident reports where experienced pilots either simply had "bad luck" or did something "unwise" and people aboard were killed, as far as crash statistics I think the average non-aviator is thinking like this: "...Bob offered to fly me to Tahoe in his plane instead of me driving.". What are the chance the plane will get to the tarmac at Tahoe in one big undented piece versus me arriving safely if I just drive it?" So we're talking in terms of "transportation system mishaps per n departures". I either go on the plane or I don't. It's ONE departure. I don't care if there are 2 people aboard or 8. I don't care all that much if the destination is 377 miles away or 912 miles. What I am concerned about is "what is the chance that that aircraft will arrive at the destination without killing anybody aboard?" I would *suspect* that in that light, general aviation does not come out looking too good. Does anyone know? I would suspect the average motor car on the road does about 25-40 'departures' a week. I couldn't even hazard a guess for GA. Reporting 'fatalities per million passenger miles' is like telling a telling a new B-17 crew reporting to an 8th Air Force base in England in October 1943, "the lads have found we're losing one aircraft and crew for every 188,256 crew member miles we fly against Jerry." The retort is sure to be, "swell, Sarge, but .... what percentage of crews are making it through the 25 missions alive?" Let's say that what they know is aircraft losses and total sorties flown. If they lose 1 bomber in 143 sorties then a plane's survival rate for 25 missions is (1-(1/143)) ^ 25, or 83.9%. So their chances of survival are about 13 out of 16. If I am a LIFE magazine photographer and I'm just going on ONE mission, my chance of survival is 142/143, or 99.3%. I'm pretty relaxed. (If it's October 14th (Black Thursday) and the target is the ball bearing factories at Schweinfurt...then my chances were 74.9%.) "Ken Hornstein" wrote in message ... In article , Marten Kemp wrote: Dan Luke wrote: You believe this in spite of the fact that the fatal accident rate is 700% higher for personal flying than for driving? Doesn't that seem like something you might want to think about a little more? -- Dan C172RG at BFM Sir, can you substantiate that amazing assertion? Citations, websites, etc? The statistics aren't easy to compare. But ... From the National Highway Transportation Safety Administration's report, "2001 Annunal Assessment Of Motor Vehicle Crashes", which can be found at the following URL: http://www-nrd.nhtsa.dot.gov/pdf/nrd...2/Assess01.pdf If you look at page 30, you can see a summary (based on year) of the fatalities per 100 million vehicular miles travelled (VMT). For the year 2001, passenger cars have 1.28 fatalities per 100M VMT, and motorcycles have 33.38 fatalities per 100M VMT. Now, the wrinkle here is that while automotive statistics are reported in miles travelled, general aviation statistics are reported in hours flown. For our 2001 aviation statistics, you can view them in the Nall Report, a copy of which you can find at the following URL: http://www.aopa.org/asf/publications/02nall.pdf Page 1 shows for 2001, there were 298 fatal accidents and 535 fatalities for 26.2 million hours flown. The highway data is based on fatalities, not fatal accidents, so let's use the latter figure, which gives us 2.042 fatalities per 100,000 hours flown. So, how do we compare the two sets of data? One very simplistic way is to pretend that everyone drives at 55 MPH, which would make automotive statistics 1.28 fatalities per 1.82 million hours driven, or .703 fatalities per million hours driven. If you assume a slower driving speed, the fatality rate per hour goes down, and if you assume a faster one, it goes up. If you stick with 55 MPH, then you end up with a 29x more times of being involved in a fatal accident with flying versus driving. If you compare motorcycles to aviation, 55 MPH gives you 18.3 fatalities per million hours driven, and 1.83 fatalities per 100,000 hours drive, which is relatively close to the statistics for aviation fatalities. This is, of course, a very simplistic view of the accident data, and there are lots of questions about how total hours are estimated, the data is collected, etc etc. And I would advise anyone who was curious about this to examine the reports themselves and draw their own conclusions. (And it would be prudent to bring up the old Mark Twain quote about liars, damned liars, and statisticians). But this can give you an idea where the often-quoted statistics about GA being more dangerous than driving, and approximately as dangerous as riding a motorcycle, come from. Personally, I believe that GA is definately more dangerous than driving, but that the majority of the risk factors in GA are under the control of the pilot. Thus, a knowledgable pilot who makes good decisions is probably safer than the average person in a car, since in a car (and especially in a motorcycle) you're more at the mercy of other people. But even though every pilot receives a ton more training than the average driver, flying is still in general more dangerous than driving, which tells me it's important to never forget the importance of good judgement. --Ken |
#55
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Jonathan Birge wrote:
"Marten Kemp" wrote in message ... Well, I admit that I *was* being a bit condescending in my original question {said he, in a slightly abashed tone of voice}, but in my defense I *did* find the statement amazing. My internal assumptions database has subsequently been reloaded with the updated data. I also admit that "opprobrium" wasn't the right word; I really meant "obolquy" (though "calumny" comes close). I tend to use large words and be snottily patronizing because I've never been good at constructing wounding personal attacks while using the vernacular. (I also seem not to be able to type at the moment. The number of t7pos has been positively amazing. Time for more coffee.) Martin, nobody likes to be outclassed by somebody who can take criticism so honorably. In fact, I find your integrity offensive. It's just selfish of you, to deny me my righteous flaming. This is Usenet, dammit! I was pretty rude. Come on! Let me have it! Don't leave me down here in the gutter alone. -Jonathan Okay, Johnny-boy. *Read my farking sig* the next time and at least get my name right, you jerk. Feel better now? {grin} -- Marten Kemp (note the "E" in my first name?) |
#56
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"Highfllyer" wrote in message
... "Jeff Franks" wrote in message ... JFK Jr. wasn't yet rated and he didn't have a close call; he died and took two people with him. The only positive is that his own criminal negligence killed him as well as his passengers. I wasn't aware that night flight required a rating...if we're gonna be literal in here lets go all the way. JFK Jr. was almost rated. He certainly had a great deal more instrument time than the average PPL. He had all the training required that he authorities think is necessary to manoeuver a plane in IMC. If someone wants to make the argument that this level of training is insufficient, then present evidence. JFK was flying on a night when the weather was legally VFR. If he HAD realized that it could be ACTUALLY IFR, while still being easily VFR LEGALLY and as reported by the aviation weather people he might not have messed up. He shouldn't have messed up that badly. How many more hours under the hood would prevent this? He got in trouble because he was flying using tried and proven VFR techniques on a legally VFR night when VFR techniques would not work. That can happen ANYTIME at night, even on a clear night. It is all a matter of visual reference. Flying at night is instrument flying if you're actually going anywhere. (This comment is not directed towards the poster to which I'm responding.) And, with instrument flying skills, it's no big deal. But it is often real IMC stuff. moo |
#57
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While I agree with the need to look at this kind of data in multiple
ways, I think the 'per departure' numbers may be very misleading. First off, there are plenty of GA planes that make literally hundreds of departures per week. I see training planes at my airport do a dozen touch-and-goes an hour, and these planes often fly 30-40 hours a week in the summer. Does that count as a 'departure'? If so, then that would dramatically reduce the 'per departure' GA accident rate. If not, then why count the automoble 'departure' that consists of a 1 mile drive to the video store? A more 'meaningful' comparison would be to compare the fatalities in different groupings of activity. While this is necessarily somewhat arbitrary, I think a reasonable question would be "If I will be travelling more than 100 miles on this trip, and going between two cities, what is the liklihood that I will arrive safely in a GA plane vs. a car?" After all, airplanes and cars have very different mission profiles on short trips. One can hardly compare a 2 mile trip in a car to a 750 mile hard-IFR cross country. Neither can one compare a T&G with an instructor aboard to a 250 mile car trip in a driving blizzard. The comparison would be meaningless. In this, I think GA will come out better than one might think. I remember reading something from AAA a couple years ago basically saying that long-distance driving (i.e. or more than two hours I believe) was dramatically more dangerous than local driving. Which is quite logical. I recently returned (driving) from a 150 mile trip, and saw at least 10 crosses by the sides of the highway. I think that the comparison between this kind of driving and GA flying a similar distance will yield a reasonably close rate of fatality. In the end, one thing we know for certain is that the vast majority of aircraft fatalities are directly attributable to pilot error. I randomly looked at 100 NTSB fatal-accident reports the other day (slow day). 91% of these crashes were clearly pilot error. And, as the Nall Report reiterates every year, something like 75% of all aircraft accidents are related to just one of three causes (VFR into IMC, low-level maneauvering [stall-spins], and fuel mismanagement. This isn't complex stuff. This is trivially easy to prevent. All it takes is training and discipline. Personally, I think it is safer to fly GA with a 'professional' quality pilot than it is to drive a similar distance (assuming a cross country). If 90% of airplane fatalities can be attributed to pilots acting stupid, then it stands to reason that if you only fly with pilots who have the training and discipoline to *not* act the fool, then you are much more likely to arrive safely than if you were flying with the 'average' pilots. If GA has a reputation for being dangerous, there is nobody to blame but ourselves. Honestly...is there *ever* an excuse for running out of gas? Is there ever an excuse for intentionally flying into clouds when you are not qualified or prepared? But pilots do it all the time. And kill people. I'd feel much safer in the back of a 182 travelling 200 miles, being piloted by a pilot who never busts minima, who never lands with less than hour of gas, and who never shows off than I would even driving my own car that 200 miles. My odds of getting hit by a drunk driver, or getting clipped by a truck that can't see me, or getting distracted for that one second and not seeing the brake lights ahead of me seem vastly higher in the car than in the plane. Cheers Cap |
#58
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Happy Dog wrote:
Flying at night is instrument flying if you're actually going anywhere. (This comment is not directed towards the poster to which I'm responding.) And, with instrument flying skills, it's no big deal. But it is often real IMC stuff. On overly broad generalization by a long shot. I don't know what part of the world you live in, but out here in the great fly-over there are plenty of visual references for night flying in many weather conditions. I'd consider "going anywhere" to include trips across multiple states for hundreds of miles, and I've done that in night VFR numerous times. Yeah, instrument skills are a valuable fallback, but the flights were not instrument flights by a long shot. |
#59
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"Marten Kemp" wrote in message
... Martin, nobody likes to be outclassed by somebody who can take criticism so honorably. In fact, I find your integrity offensive. It's just selfish of you, to deny me my righteous flaming. This is Usenet, dammit! I was pretty rude. Come on! Let me have it! Don't leave me down here in the gutter alone. -Jonathan Okay, Johnny-boy. *Read my farking sig* the next time and at least get my name right, you jerk. Feel better now? {grin} Much, thank you! Sorry about screwing up your name. That was unintentional. |
#60
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Jonathan Birge wrote:
"Marten Kemp" wrote in message ... Martin, nobody likes to be outclassed by somebody who can take criticism so honorably. In fact, I find your integrity offensive. It's just selfish of you, to deny me my righteous flaming. This is Usenet, dammit! I was pretty rude. Come on! Let me have it! Don't leave me down here in the gutter alone. -Jonathan Okay, Johnny-boy. *Read my farking sig* the next time and at least get my name right, you jerk. Feel better now? {grin} Much, thank you! Sorry about screwing up your name. That was unintentional. You're welcome. It happens a lot, actually. -- Marten Kemp |
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