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In [[aviation]] terminology, the '''outside air temperature''' (OAT) or static air temperature (SAT) refers to the [[Air temperature|temperature of the air]] around an [[aircraft]], but unaffected by the passage of the aircraft through it.<ref name = "FAA Definition">http://www.airweb.faa.gov/Regulatory_and_Guidance_Library/rgAdvisoryCircular.nsf/0/897d269dbf5d731b8625766400563924/$FILE/AC%20251419-2.pdf</ref> | |||
==Aviation usage== | |||
The outside air temperature is used in many calculations pertaining to [[flight planning]], some of them being [[takeoff]] performance, [[density altitude]], [[Cruise (flight)|cruise]] performance and [[go-around]] performance.<ref>''Ground Studies for Pilots: Flight Planning,'' Sixth Edition (Ground Studies for Pilots Series), Peter J. Swatton, Wiley-Blackwell; 6 edition (December 3, 2002), 978-0632059393</ref> In most texts, the abbreviation, "OAT" is used. | |||
===Units=== | |||
Most performance and flight planning graphs and tables use either degrees [[Celsius]] or [[Fahrenheit]] or both. The [[Kelvin]] scale, however, is used for [[Mach number]] calculations. For example, the [[speed of sound]] in dry air is | |||
:<math>{c}= 38.945 \sqrt{K}</math> | |||
where: | |||
:<math>c</math> is the speed of sound in [[Knot (unit)|knots]] and | |||
:<math>K</math> is the outside air temperature in [[kelvin]]s | |||
===Sources=== | |||
Outside air temperature can be obtained from the aviation [[meteorology|meteorological]] services, on the [[Automatic Terminal Information Service|ATIS]] or measured by a [[sensor|probe]] on the aircraft. When measured by the airplane's probe in flight, it may have to be corrected for [[adiabatic]] (ram effect) rise and [[friction]],<ref>http://www.faa.gov/library/manuals/aviation/pilot_handbook/media/PHAK%20-%20Appendix-Glossary-Index.pdf</ref> particularly in high performance aircraft. | |||
==See also== | |||
*[[Acronyms and abbreviations in avionics]] | |||
*[[Density altitude]] | |||
*[[Hot and high]] | |||
*[[Total air temperature]] | |||
==References== | |||
<references/> | |||
[[Category:Aviation meteorology]] |
Revision as of 17:12, 25 September 2013
In aviation terminology, the outside air temperature (OAT) or static air temperature (SAT) refers to the temperature of the air around an aircraft, but unaffected by the passage of the aircraft through it.[1]
Aviation usage
The outside air temperature is used in many calculations pertaining to flight planning, some of them being takeoff performance, density altitude, cruise performance and go-around performance.[2] In most texts, the abbreviation, "OAT" is used.
Units
Most performance and flight planning graphs and tables use either degrees Celsius or Fahrenheit or both. The Kelvin scale, however, is used for Mach number calculations. For example, the speed of sound in dry air is
where:
Sources
Outside air temperature can be obtained from the aviation meteorological services, on the ATIS or measured by a probe on the aircraft. When measured by the airplane's probe in flight, it may have to be corrected for adiabatic (ram effect) rise and friction,[3] particularly in high performance aircraft.
See also
References
- ↑ http://www.airweb.faa.gov/Regulatory_and_Guidance_Library/rgAdvisoryCircular.nsf/0/897d269dbf5d731b8625766400563924/$FILE/AC%20251419-2.pdf
- ↑ Ground Studies for Pilots: Flight Planning, Sixth Edition (Ground Studies for Pilots Series), Peter J. Swatton, Wiley-Blackwell; 6 edition (December 3, 2002), 978-0632059393
- ↑ http://www.faa.gov/library/manuals/aviation/pilot_handbook/media/PHAK%20-%20Appendix-Glossary-Index.pdf