DMAN: enhanced
tactical scheduling

ORTHOGON supports SESAR deployment

Modernizing Air Traffic Management

Increasing efficiency and predictability and, reducing environmental impacts are key objectives for both the NextGen and SESAR Air Traffic Management (ATM) system modernization initiatives. In Europe, the ATM Master Plan outlines essential changes that are foreseen to achieve the European Single European Sky objectives.


As first part of the “SESAR Deployment Phase”, the European Commission has adopted the EU Regulation 716/2014 – Pilot Common Project (PCP), mandating comprehensive technology improvements to the European ATM system.


Based on the binding EU regulation, the SESAR Deployment Manager published the Deployment Programme, which includes “Airport Integration and Throughput” as one of six ATM Focus Areas. Among others, this focus area addresses the implementation of Departure Management Synchronized with Pre-Departure sequencing and integrating Surface Management Constraints.


During the past years, airport operators began to deploy innovative applications such as Harris Orthogon’s ORTHOGON Departure Manager (DMAN), ORTHOGON Pre-Departure Sequencer (PDS) (as part of Airport-Collaborative Decision Making), or are coupling their ORTHOGON Arrival and Departure Manager systems. Expected benefits are improved throughput, efficiency and environmental gains, information sharing and predictability and therefore, leading to an improvement in total airport performance.


  • Global ATM modernization efforts request the implementation of innovative technologies. For the airport surface, where the primary constraints are limited runways, taxiways and gates, the SESAR Pilot Common Project requires the operation of:
    • “DMAN synchronized with Pre-Departure Sequencing” and “DMAN integrating Surface Management Constraints” at 25 European airports as from 1 January 2021.
    • “Automated Assistance to Controller for Surface Movement Planning and Routing“ at 25 European airports as from 1 January 2024.
  • Departure management processes and systems are required by capacity constrained airports that are looking to improve on time performance.
  • Departure management is required for optimized resource management by airports, airlines, and ground handling service providers.

ORTHOGON Departure Management to Increase Airport Capacity, Efficiency and Predictability

Departure Management is the continuous planning process focused on improving the overall movement of aircraft departing from an airport by optimizing the target times at the stands and departure runways.


Specifically, a Departure Manager, which is a planning tool enabling this process, calculates Target Take-Off Times (TTOTs) and Target Startup Approval Times (TSATs) while taking multiple constraints and preferences into consideration.


A Departure Manager provides an optimized departure flow that improves throughput at the runway, reduces queueing times on the taxiways, while distributing this information to all key stakeholders at the airport that are involved in the aircraft turn around process and therefore, increasing the predictability of the operations.


Harris Orthogon’s Departure Manager and Pre-Departure Sequencer are the tools of choice for airports and Air Navigation Service Providers globally. For example, Singapore Changi Airport most recently selected Harris Orthogon to deploy the PDS.


In Europe specifically, the ORTHOGON applications directly support the requirements of PCP.

  • DMAN Synchronized with Pre-Departure Sequencing (Sub-AF2.1): the ORTHOGON DMAN (incl. PDS) is operational at Gatwick airport since 2014 (AMAN since 2009). In August 2015, a world record of 934 movements on one mixed-mode runway on a single day was achieved at Gatwick Airport.
  • DMAN Integrating Surface Management Constraints (Sub-AF2.2): DHMI (Turkey) is implementing Harris Orthogon’s AMAN and DMAN while taking into consideration information from the A-SMGCS system.
  • Coupled AMAN/DMAN is a functionality which ORTHOGON provides, that goes beyond what the SESAR PCP requires. Linking the two systems has proven significant runway capacity improvements during SESAR real-time validation exercises.


  • Increased Airport Capacity: Maximized runway throughput by enhanced tactical scheduling according to the real traffic situation and considering surface management constraints
  • Improved On Time Performance: good predictability of off-block and take-off times and improved adherence to Air Traffic Flow Management (ATFM) slots
  • Increased Operational Predictability: all airport stakeholders achieve significantly increased predictability of the outbound traffic.
  • Optimized Departure Queues: reduce aircraft queue lengths and taxiing time to deliver a highly predictable and stable flow of traffic to the runways
  • Considerable Reductions in Taxi-Out Times: optimized gate push-back times reduces the likelihood of queues and therefore reduces amount of time spent on taxiways
  • Lower Operational Costs: significant reduction in fuel burn due to reduced taxi times and waiting times on engines
  • Decreased Environmental Impact: significant reduction in CO2 and NOx emission due to reduced taxi times and waiting times on engines

ORTHOGON Departure Manager (DMAN)

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ORTHOGON Pre-Departure Sequencer (PDS)

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"Throughout Gatwick's A-CDM 55 program, Harris Orthogon has provided a high quality product and service delivery."

Chris Howell, Head of Business Systems - Gatwick Airport IT

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