ORTHOGON enabling

ORTHOGON enabling ICAO Aviation System Block Upgrades for Runway Sequencing and Airport-CDM

ICAO ASBU – The Global ATM Modernization Strategy

The Aviation System Block Upgrades (ASBU) is the Air Traffic Management (ATM) modernization strategy introduced by the International Civil Aviation Organization (ICAO). The ICAO ASBU refers to the target timelines for a group of operational improvements, organized in four performance improvement areas and individual modules. The ASBU modules have been included within the 2013-2028 Global Air Navigation Plan (Doc 9750). ICAO is working with its member states to help each determine exactly which capabilities they should have in place based on their operational requirements.


Runway Sequencing and Airport-Collaborative Decision Making (A-CDM) are two of the modules in the Airport Operations performance area. Key objectives of these modules are to increase airport performance and to achieve airport operational improvements through the way operational partners at airports work together. The ORTHOGON products support Air Navigation Service Providers (ANSPs) and airports to implement both of these modules.


  • Sequencing and metering compliant to the ASBU Runway Sequencing Block 0 requirements.
  • Pre-departure sequencing and surface metering compliant to the ASBU A-CDM Block 0 requirements.
  • Extended arrival metering functionality and consideration of surface movement track data (Runway Sequencing Block 1).
  • Decision support for all stakeholders in a Total Airport Management environment (A-CDM Block 1).
  • Coupled AMAN/DMAN for maximized runway utilization (Runway Sequencing Block 2).
  • Integration of surface, arrival, and departure management as well as en-route aspects (Runway Sequencing Block 3).

Accelerating ICAO ASBU implementation with operationally proven products

ORTHOGON Arrival and Departure Manager (AMAN/DMAN) are proven products with worldwide references and fully compliant to all current requirements of the Runway Sequencing initial operating capabilities (Block 0).


Moreover, these operational ORTHOGON systems already provide a large number of advanced functions, which allow ANSPs and airports to be compliant to the innovative solutions referenced in ASBU Blocks 1 and higher. Already now customers can make use of their proven benefits. Examples of such advanced functions are extended arrival management (operational at London Heathrow since April 2014), consideration of surface constraints, or coupled arrival and departure management (validated in SESAR real-time simulations in October 2014).


The implementation of Pre-Departure Sequencing (European terminology) or Surface Metering (US terminology) solutions are key enablers for Airport-CDM. ORTHOGON Pre-Departure Sequencer (PDS) and DMAN provide pre-departure sequencing and surface metering capabilities compliant to the ASBU A-CDM initial operating capabilities. Moreover, ORTHOGON DMAN includes additional advanced functionalities to further support Air Traffic Control (ATC) operations. The ORTHOGON Demand and Performance Prediction (DPP) functionality was integrated into the Total Airport Management Suite (TAMS) trials (2008-2012) and provides decision support for all stakeholders in a Total Airport Management environment in accordance with the A-CDM Block 1 requirements.


  • Time-based metering will optimize usage of terminal airspace and runway capacity.
  • Efficiency is positively impacted as reflected by increased runway throughput and arrival rates.
  • Reduction in fuel burn and environment impact (emission and noise).
  • Decreased uncertainties in aerodrome/terminal demand prediction.
  • Flexibility by enabling dynamic scheduling.
  • Optimized utilization of terminal and runway resources.
  • Increased efficiency of the ATM system for all stakeholders.

ORTHOGON Arrival Manager (AMAN)

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ORTHOGON Departure Manager (DMAN)

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ORTHOGON Pre-Departure Sequencer (PDS)

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“Harris’ Arrival Manager is another step on the path for NATS to improve efficiency and cut fuel burn and emissions. This tool will be invaluable to controllers in charge of some of the most complex airspace in the world.”

Michael P. Stoller, Engineering and Programmes Director at NATS

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