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#11
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#12
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[[ This message was both posted and mailed: see
the "To," "Cc," and "Newsgroups" headers for details. ]] FAA Advisory circulars 150/5300-13 and 150/5325 privide explaination of runway lengths required based on aircraft capabilities. |
#13
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AES/newspost wrote: Can one _define_ the "start" and the "end" of a runway to within several inches? (seems to me paving or blacktop would roll off over several inch range) Absolutely. You start the measuring wheel at the edge of the threshold mark and stop it at pavement end. George Patterson To a pilot, altitude is like money - it is possible that having too much could prove embarassing, but having too little is always fatal. |
#14
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An Actual Fact (out of character for Usenet, but don't tell anybody) from a
friend who's an airport manager. I posed the group question, and his reply is: "Most airports have that extra foot for insurance reasons. Aircraft insurance policies for GA and corporate aircraft limit the operators to runways longer than 3600 feet, 4000 feet, 5000 feet or whatever. So we build runways one foot longer than what we think the insurance carriers require. The other requirement that insurance carriers what are precision approaches. Aircraft owners of turbines can get reduced premiums or are limited to use runways with precision approaches." |
#15
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"G.R. Patterson III" wrote:
AES/newspost wrote: Can one _define_ the "start" and the "end" of a runway to within several inches? (seems to me paving or blacktop would roll off over several inch range) Absolutely. You start the measuring wheel at the edge of the threshold mark and stop it at pavement end. I obviously wasn't making any very great point here, other than that "pavement end" might not be all that sharply defined, at least given my observations of the edges of highway pavements, and more generally measuring large physical things to 1 part in 5000, or 0.05% accuracy, takes some care. To measure a 5000 foot runway to a precision of 1 foot using a 2 foot diameter measuring wheel requires for example that the diameter of said wheel be known to an accuracy of 5 mils = 0.005 inches, including any dust or dirt layers it may pick up. I'd also note that if the end of a 50 foot wide runway (I suppose that's a pretty wide runway for some airports) is cut 1 degree off from perfectly square, the runway is 1 foot longer on one side than on the other. |
#16
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On 21 Oct 2003 02:44:05 GMT, (StellaStar) wrote:
An Actual Fact (out of character for Usenet, but don't tell anybody) from a friend who's an airport manager. Bringing Actual Facts into a newsgroup discussion is an unforgivable breach of Usenet ethics. all the best -- Dan Ford email: www.danford.net/letters.htm#9 see the Warbird's Forum at www.warbirdforum.com and the Piper Cub Forum at www.pipercubforum.com |
#17
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[[ This message was both posted and mailed: see
the "To," "Cc," and "Newsgroups" headers for details. ]] In article , AES/newspost wrote: I obviously wasn't making any very great point here, other than that "pavement end" might not be all that sharply defined, at least given my observations of the edges of highway pavements, and more generally measuring large physical things to 1 part in 5000, or 0.05% accuracy, takes some care. To measure a 5000 foot runway to a precision of 1 foot using a 2 foot diameter measuring wheel requires for example that the diameter of said wheel be known to an accuracy of 5 mils = 0.005 inches, including any dust or dirt layers it may pick up. I'd also note that if the end of a 50 foot wide runway (I suppose that's a pretty wide runway for some airports) is cut 1 degree off from perfectly square, the runway is 1 foot longer on one side than on the other. Differential GPS can measure down to 0.001 cm. Laser rangefinding is comparable. |
#18
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I would think it has more to do with the painting on the runway. The
length of the pavement seems to rarely correlate to the length of the runway. ie over runs, thresholds, etc. -- Kevin McCue KRYN '47 Luscombe 8E Rans S-17 (for sale) -----= Posted via Newsfeeds.Com, Uncensored Usenet News =----- http://www.newsfeeds.com - The #1 Newsgroup Service in the World! -----== Over 100,000 Newsgroups - 19 Different Servers! =----- |
#19
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"Steve Robertson" wrote in message ... Never thought about that before. However, my guess is that it is to make sure that aircraft insurance requirements as to minimum runway lenght for certain types is exceeded rather than simply met. Anybody else? Best regards, I think you are correct. The posters talking about the tarmac getting longer/shorter, or other similar ideas, are ignoring the fact that the published 'runway length', rarely matches that of the actual surface. Most airports, do not have the threshold painted exactly on the ends of the runway surface. A local airfield to me, exactly meets the other type of example being given (with a runway 1 foot under a round number), yet the actual surface extends over 50 feet past the threshold markings. Hence the markings have been deliberately placed inside the physical runway length, and an insurance/physical planning limitation on particular aircraft types, would seem to be the only logical explanation. Best Wishes Steve Robertson N4732J 1967 Beechcraft A23-24 Musketeer Ace Pilot wrote: Can anyone explain why runway lengths are sometimes "X thousand and ONE feet" in length? I was just looking through a list of Iowa's approximately 110 airports and 7 of them have runways that are "X thousand and one feet" long. Do runway manufacturing companies offer special deals like "Buy 5,000 feet of runway, get your next foot free!!!" There's got to be a logical explanation - anyone know it? |
#20
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"Kevin McCue" wrote in message ...
I would think it has more to do with the painting on the runway. The length of the pavement seems to rarely correlate to the length of the runway. ie over runs, thresholds, etc. Maybe heavy braking on a hot day stretches the pavement? ;-) Dan |
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