Turbulence in the National Airspace System

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Presentation transcript:

Turbulence in the National Airspace System Aviation Turbulence Workshop David Holly, FAA August 29, 2013

What we’ll cover The National Airspace System (NAS) Levels of turbulence How turbulence reports get to controllers How turbulence is reported by controllers Effects of turbulence in the NAS Questions

National Airspace System (NAS)

National Airspace System (NAS)

Atlanta ARTCC (ZTL) 1.79 million operations in 2013 Charlotte Douglas Int’l #5 362,000 operations in 2013 Atlanta Hartsfield-Jackson 592,000 operations in 2013 Calendar year 1.79 million operations so far this year 2.78 for the fiscal year ZNY is close behind us due to oceanic traffic ATL operations 592,000 so far this year 566,000 for ORD CLT operations #5 362,00 so far this year

Levels of Turbulence Light Moderate Severe Extreme Light: Turbulence that momentarily causes slight erratic changes in altitude and/or attitude (pitch, roll, yaw). Moderate: Similar to Light Turbulence but of greater intensity. Changes in altitude and/or attitude occur but the aircraft remains in positive control at all times. It usually causes variations in indicated airspeed. Severe: Turbulence that causes large, abrupt changes in altitude and/or attitude. It usually causes large variations in indicated airspeed. Aircraft may be momentarily out of control. Extreme: Turbulence in which the aircraft is violently tossed about and is practically impossible to control. It may cause structural damage.

How turbulence info gets to controllers Pilot reports climbing, descending, at cruise altitude Weather briefings from other controllers or from supervisors Review of current and forecasted upper winds

How controllers report turbulence PIREPs Relief briefings Calls to adjacent sectors or facilities

Effects of turbulence in the NAS Changes in altitude crossing restrictions Route changes Cruise altitude changes Loss of speed control as a tool in getting and maintaining spacing between aircraft Holding in the hope of improving conditions Reportable incidents

7/3/13 2000z

7/3/13 2005z

7/3/13 2010z – Moderate reported

7/3/13 2015z – holding

7/3/13 2020z – holding continues

7/3/13 2025z – test flights

7/3/13 2030z – running again

7/3/13 2035z

7/3/13 2040z

What we covered The National Airspace System (NAS) Levels of turbulence How turbulence reports get to controllers How turbulence is reported by controllers Effects of turbulence in the NAS

Questions?

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Questions?