ASSTAR Airborne Separation Operations in Oceanic Airspace Bob McPike, NATS ASAS-TN2 Conference...
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ASSTAR Airborne Separation Operations in Oceanic Airspace Bob McPike, NATS ASAS-TN2 Conference Glasgow, September 2006
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page 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
Transcript of ASSTAR Airborne Separation Operations in Oceanic Airspace Bob McPike, NATS ASAS-TN2 Conference...
ASSTAR
Airborne Separation Operations in Oceanic Airspace
Bob McPike, NATS
ASAS-TN2 ConferenceGlasgow, September 2006
page 2
Overview
Background to oceanic operations
ASAS operations to improve flight flexibility
ASAS operations to manage airspace congestion
page 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
page 4
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
10 mins
60 miles1000 ft
15 mins
page 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
page 6
In-Trail Procedure
FL340
FL360
FL350
> 10 mins > 10 mins
ATSA-ITP
Criteria
• Aircraft at FL340 would like to climb …..• But standard longitudinal separation does not exist at level above • Crew request an ITP Climb
5 mins
page 7
In-Trail Follow
5 mins
• 5 minutes : No standard longitudinal separation
ITF
• 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
page 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
page 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)
page 10
Traffic Concentration 24 May 2006
page 11
Traffic Streaming
page 12
Tactical re-routes in the NAT
15 minutes 4 minutes
ITF
