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Overview

ASSTAR Airborne Separation Operations in Oceanic Airspace Bob McPike, NATS ASAS-TN2 Conference Glasgow, September 2006. Overview. Background to oceanic operations ASAS operations to improve flight flexibility ASAS operations to manage airspace congestion. Oceanic Communications.

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Overview

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  1. ASSTARAirborne Separation Operations in Oceanic Airspace Bob McPike, NATSASAS-TN2 ConferenceGlasgow, September 2006

  2. Overview • Background to oceanic operations • ASAS operations to improve flight flexibility • ASAS operations to manage airspace congestion

  3. Oceanic Communications • No VHF Radio or radar cover over most of the North Atlantic Region (NAT) • Voice communications provided by High Frequency (HF) Radio • HF subject to weather effects • Audibility can be limited • Sometimes communication is impossible • So ATC issues strategic clearances • Issued prior to entering an oceanic Flight Information Region (FIR) • Extend from Oceanic Control Area (OCA) entry to landfall • Long-term conflict prediction used to ensure no separation loss over whole route

  4. 15 mins 10 mins 60 miles 1000 ft Oceanic Separation Standards • Separation standards governed by various uncertainties: • Communication unreliability • Navigational accuracy • Accuracy of forward estimates (driven by weather forecasts) . . . so separation standards are very large

  5. ASAS in Oceanic Airspace • ASAS concepts under consideration by ASSTAR for oceanic airspace • In-Trail Procedure (ATSA-ITP and ASEP-ITP) • In-Trail Follow (ASEP-ITF) • Self-Separation on a Free-Flight Track (SSEP-FFT) • Status • Concepts and procedures defined • Simulations will be conducted in Amsterdam November 2006 to March 2007

  6. > 10 mins > 10 mins FL360 ATSA-ITPCriteria 5 mins FL350 In-Trail Procedure • Aircraft at FL340 would like to climb ….. • But standard longitudinal separation does not exist at level above • Crew request an ITP Climb FL340

  7. ITF 5 mins In-Trail Follow • 5 minutes : No standard longitudinal separation • Airborne Separation Established: In-Trail Follow • Climb Approved, Maintaining In-Trail Airborne Separation • In-Trail Separation maintained over extended period • Second climb approved –Maintaining ITF Separation • In-Trail Follow cancelled • Exit Oceanic Airspace FL360 FL350 FL340

  8. Self-Separation on a Free-Flight Track • Concept still in the early stages of development • FFT is an OTS track reserved for ASAS-capable aircraft • Aircraft on the track can change speed and level at their own discretion . . . but no lateral flexibility allowed • Aircraft requires downstream clearance to re-enter managed airspace

  9. Using ASAS to manage airspace congestion • Oceanic/Domestic Interface - a Plumbing Problem? • Narrow ‘pipes’ in European/North American regions • European pipework highly complex (lots of crossing and converging traffic)

  10. Traffic Concentration 24 May 2006

  11. Traffic Streaming

  12. 15 minutes ITF 4 minutes Tactical re-routes in the NAT

  13. Thank you for listening bob.mcpike@nats.co.uk

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