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Runway Friction Index
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Runway Friction Index
Icebound opined
WHY would not the US adopt it? http://www.usatoday.com/news/nation/...ay-tests_x.htm NIH, and it is a good idea. -ash Cthulhu in 2005! Why wait for nature? |
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Runway Friction Index
Cost benefit analysis? There are lots of great safety things the FAA
can spend money on, perhaps in the U.S. icy runways make up less of the accidents and therefore are not the optimal place to spend money? -Robert |
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Runway Friction Index
"Icebound" wrote in message ... WHY would not the US adopt it? http://www.usatoday.com/news/nation/...ay-tests_x.htm "The Federal Aviation Administration, which regulates airports in the USA, helped fund research that Canadians used to establish their system, but the FAA has been wary of adopting it. FAA officials say there is too much room for error in the Canadian system." "As a result, pilots landing on snowy or icy runways in the USA must rely primarily on the reports of other pilots who have just touched down to determine whether it is safe. These pilot reports have been criticized for decades by pilot unions and accident investigators as subjective and prone to error." "In the USA, the FAA advises airports to test runways during wintry weather, but pilots aren't allowed to use the results. The FAA's goal is to eventually give pilots more precise information tailored to specific aircraft models, spokeswoman Laura Brown says. Until then, the agency is hesitant to adopt a system like Canada's. Officials worry that the results from testing equipment cannot be guaranteed and could be misleading in certain types of aircraft." The report is wrong. Vehicles with runway friction measurement equipment have been used at US airports for years and the information is provided to pilots. FAA Order 7110.65R Air Traffic Control Chapter 3. Airport Traffic Control-- Terminal Section 3. Airport Conditions 3-3-4. BRAKING ACTION Furnish quality of braking action, as received from pilots or the airport management, to all aircraft as follows: d. Furnish runway friction measurement readings/values as received from airport management to aircraft as follows: 1. Furnish information as received from the airport management to pilots on the ATIS at locations where friction measuring devices, such as MU-Meter, Saab Friction Tester (SFT), and Skiddometer are in use only when the MU values are 40 or less. Use the runway followed by the MU number for each of the three runway segments, time of report, and a word describing the cause of the runway friction problem. Do not issue MU values when all three segments of the runway have values reported greater than 40. EXAMPLE- "Runway two seven, MU forty-two, forty-one, twenty-eight at one zero one eight Zulu, ice." 2. Issue the runway surface condition and/or the Runway Condition Reading (RCR), if provided, to all USAF and ANG aircraft. Issue the RCR to other aircraft upon pilot request. EXAMPLE- "Ice on runway, RCR zero five, patchy." NOTE- 1. USAF has established RCR procedures for determining the average deceleration readings of runways under conditions of water, slush, ice, or snow. The use of the RCR code is dependent upon the pilot's having a "stopping capability chart" specifically applicable to his/her aircraft. 2. USAF offices furnish RCR information at airports serving USAF and ANG aircraft. http://www.faa.gov/atpubs/ATC/Chp3/atc0303.html#3-3-5 |
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Runway Friction Index
"Icebound" wrote in message WHY would not the US adopt it?
The US already has a system? The big airports can provide runway traction reports measured in 'Mu'. These reports are much more useful than pilot reports. D. |
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Runway Friction Index
"Capt.Doug" wrote in message ... The big airports can provide runway traction reports measured in 'Mu'. As can the not-so-big airports. |
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Runway Friction Index
Capt.Doug wrote: "Icebound" wrote in message WHY would not the US adopt it? The US already has a system? The big airports can provide runway traction reports measured in 'Mu'. These reports are much more useful than pilot reports. Yes, our airport can report in mu. I have yet to find the airline pilot who finds those three numbers useful. They always ask for the standard braking action report. |
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Runway Friction Index
Friction is a variable, a wheel has friction in the wheel
bearing and on the tread to the pavement. The pavement when clean and dry has a fairly stable Mu which is a coefficient from perfect friction to no friction. If there is water or ice, the actual friction may change second by second as the temperature changes or more precipitation falls. It would be nice if somebody built a runway 3,000x24,000 feet with a Teflon surface so pilots could practice controlled landings. How slick is oiled Teflon? -- James H. Macklin ATP,CFI,A&P -- The people think the Constitution protects their rights; But government sees it as an obstacle to be overcome. some support http://www.usdoj.gov/olc/secondamendment2.htm See http://www.fija.org/ more about your rights and duties. "Newps" wrote in message ... | | | Capt.Doug wrote: | "Icebound" wrote in message WHY would not the US adopt it? | | | The US already has a system? | | The big airports can provide runway traction reports measured in 'Mu'. These | reports are much more useful than pilot reports. | | Yes, our airport can report in mu. I have yet to find the airline pilot | who finds those three numbers useful. They always ask for the standard | braking action report. |
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Runway Friction Index
Yes, our airport can report in mu. I have yet to find the airline pilot who finds those three numbers useful. They always ask for the standard braking action report.
I've never heard of mu numbers in this context. How are they used? Jose -- Nothing takes longer than a shortcut. for Email, make the obvious change in the address. |
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Runway Friction Index
They give us three numbers, such as 33 35 38, for the thirds of the
runway. It was an attempt a few years ago to standardize the runway condition so the number means the same thing to everybody and removes the subjectiveness of braking action fair. It is so useless we don't put it on the ATIS anymore and when we get asked for the runway condition we give it to them in the old way, good, fair, etc. Nobody ever asks for the mu number. Ever. Jose wrote: Yes, our airport can report in mu. I have yet to find the airline pilot who finds those three numbers useful. They always ask for the standard braking action report. I've never heard of mu numbers in this context. How are they used? Jose |
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