Mathijs Post (MSc)Air Traffic Flow Management for Amsterdam Airport Schiphol

Air Traffic Flow Management is a measure to optimize the flow of traffic in the European air transportation system. Flights are planned such that these can be operated with as little delay as possible. However, on the day of operation many changes can still happen. Amsterdam Airport Schiphol is the biggest contributor to Airport ATFM Delay in Europe, meaning many flights are delayed because of congestion or other airport related reasons at Schiphol. Besides Airport ATFM Delay, the arrival punctuality of flights at Schiphol can be improved. More insights into the causes and interactions of operational parameters is necessary to understand the main contributors for Airport ATFM Delay and arrival delay. A Bayesian Network is proposed, which is a Probabilistic Graph Model that can find interactions between variables and can identify the operational conditions leading to Airport ATFM Delay and arrival delay.

Graduated: June 2021

Bart Bouwels (MSc) – Air Traffic Management Concept for Off-Idle Continuous Descent Operations at Schiphol

Due to the continued growth of the aviation industry, emission and noise production are at an all-time high. In order to reduce this, conventional approaches could be replaced by continuous descent approaches (CDA). These eliminate all level segments, greatly reducing the average thrust setting, resulting in large reductions in noise and emission production. The problem with almost all CDA procedures is that it makes it much more difficult to predict the future position of an aircraft since it flies its own optimal descent profile, with zero thrust. This results in a need for more separation, greatly reducing the airport capacity. This can largely be solved by using a fixed, constant descent angle for all aircraft. Assessing the robustness of such a concept for a high capacity airport is therefore an important stepping stone towards actual implementation.

Graduated: May 2021

Janjaap Wijnker (BSc)Evaluating the accuracy of information provided by the (D-1) OPS plan

In early 2020 LVNL implemented the OPS plan with the objective to improve the alignment of traffic demand with available capacity. This can be achieved by improving the predictability of the operations and make this transparent and accessible for the stake-holders. Every day the PRE-TACT unit develops an OPS plan for the following operational day. The plan contains two types of information, external factors that might impact the capacity, and recommendations for the most optimal operations. The recommendations are based on the external factors, for example the predicted traffic demand and weather forecast. These two factors contribute to the configuration of runways, and the runway selection determines the required capacity. In order to for LVNL to improve possible deficiencies of the OPS plan, the aim of this research study is to evaluate the accuracy and precision of the predicted traffic demand. The analysis focusses on the difference between predicted and actual traffic demand on a 20 minute resolution. In addition, the implications of factors contributing to the proposed runway configuration will be assessed since the use of different runways could have a significant impact on the capacity.

Graduated: April 2021

Brian Verhoeven (MSc) – Improving the predictability of Aircraft Induced Lightning (AIL) for Mainport Schiphol

Lightning strikes to aircraft are not uncommon in aviation. Although they are not dangerous anymore, they can still result in damages to the aircraft and delay airline operations. Passengers can get scared from the lightning strike as well. Especially in the region around Amsterdam Schiphol Airport, AIL can occur during fall and winter as well. Estimations are that 90% of the lightning strikes are a result of the aircraft triggering a lightning strike, rather than being accidentally struck. In order to prevent as many strikes as possible, it is thus key to understand this process. Therefore, this research aimed to gain a as complete as possible understanding of the process of AIL and use this knowledge to supply new information about AIL to pilots, as AIL is not included in most standard pilot trainings. This can allow pilots to become more aware of AIL and prevent more lightning strikes and the corresponding inconveniences from occuring.

Finished internship: January 2021

Jeanette Derks (MSc) – Coordinated Arrival and Departure Management for Dependent Runway Operations

The foreseen increase in air traffic movements in combination with eased separation minima between aircraft, redefined by the International Civil Aviation Organization (ICAO) in 2015, is expected to emphasize current runway dependencies at airports even further. As the number of aircraft in vicinity of an airport will increase, conflicting flight paths between arriving aircraft and departing aircraft will become a bigger safety hazard and will affect the efficiency of both the arrival and departure traffic flow. Airports that rely on dependent runways in their daily operation await serious congestion problems if no coordination between arrival and departure management will be initiated soon. Therefore, this research aimed to increase runway configuration capacity at airports that experience interference between arrival and departure capacity due to the use of dependent arrival and departure runways by developing and exploring multiple concepts for a coordination mechanism between Arrival and Departure Management.

Graduated: November 2020

Robin Vervaat (MSc) – Priority-based flight scheduling in the tactical phase

Years of growth in air travel have meant that, as usage is nearing current capacity, delays are becoming virtually inevitable for air carriers operating in our airspace. Flight delays have a significant impact on airport and airline operations, as well as their cost. As such, tactical planning of the flights has become increasingly important, especially for a hub-operator with many connecting passengers. In collaboration with LVNL, KLM and Amsterdam Airport Schiphol, a novel model is being investigated tasked with the Arrival Sequencing and Scheduling of flights considering (airline) priority criteria. Smarter use is to be made of the available infrastructure in order to increase capacity and decrease delay (costs), however, fairness and equality between stakeholders will still need to be upheld.

Graduated: September 2020

Bas Timmer (BSc)Analysing inbound sources of information to improve the predictability and accuracy of the landing times

With the growing aviation industry in Europe, efficient use of the inbound capacity becomes even more important. One of the determining factors in capacity is the ability of accurately predict the landing time of aircraft. LVNL systems AAA and ASAP generate their inbound sequence planning based on Estimated Landing Times (ELDT) calculated from a variety of data sources. When CDM was implemented, business rules were put in place to prioritize certain data sources above another based on quality and accuracy. Nowadays, the quality and accuracy of these sources are thought to be different. Reviewing the current business rules is done by analyzing the quality and accuracy of the data sources, and how flight characteristics or procedures can influence the accuracy of the ELDT.

Graduated: August 2020

Max (MSc) – Aircraft noise model validation using noise measurment feedback

One of the current factors limiting the growth of the aviation industry in the Netherlands is the relationship between the aviation sector and local communities around airports. Aircraft noise production is one of the main causes of nuisance in residential areas reported by RIVM. It is therefore, for the aviation industry as a whole, of great importance to gain a better understanding of the methodology of aircraft noise modelling and make improvements on this modelling process if deficiencies in the current model are detected. The validation of the aircraft noise model, using noise measurements taken around the airport, is crucial for the scientific foundation of the model. This scientific foundation is expected to increase the transparency in how noise calculations are performed, which increases community trust in the aviation industry as a whole.

Graduated: July 2020

Ashley Scheenloop (BSc) – Impact of the fleet mix on the outbound capacity at Schiphol Airport

With the future growth in amount of flight movements in the aviation sector, efficient use of the airport resources are getting more and more important. In 2019 it was seen that the declared runway capacity at Schiphol airport is not reached during the outbound peaks. Previous research showed that the aircraft type (Wake turbulence category) influences the runway capacity. With the use the A-CDM principle, the outbound phase at Schiphol airport is analysed. This way the time spent, between the time references (A-CDM Milestones), for each Wake turbulence category is analysed and compared. This will provide an insight on the behaviour of these aircraft types, and indicates a possible significant difference/bottleneck. Besides the active runway combinations are analysed during these outbound peaks.

Graduated: July 2020

Marc Out (BSc) Reducing the fluctuations on the outbound planning at Amsterdam Airport Schiphol

At Amsterdam Airport Schiphol, the outbound planning is created by the Collaborative Pre-Departure Sequence Planner (CPDSP). Currently, this outbound planning is fluctuating because of frequent updates of the Target Off-Blocks Time (TOBT). Having a dynamical outbound planning could create in a loss of valuable outbound capacity and increasing the risks in regulated flights by EUROCONTROL. To reduce the occurrence of frequent TOBT updates, different business rules have been analyzed for the auto-TOBT update mechanism. This mechanism updates the Target Off-Blocks Time automatically once the inbound flight has an assigned landing runway until the moment the aircraft is in-blocks or the Main Ground Handler updated the TOBT manually. The analyzed business rules had different characteristics related to the frequency of TOBT updates and the accuracy of this target time. Those two main characteristics were required to analyze to be able to have an overview which business rule creates less updates but having the same quality as in the current situation.

Graduated: July 2020

Thijs Scheffers (BSc) – Improving the outbound planning process at Amsterdam Airport Schiphol

To improve the outbound planning process of Schiphol Airport, the frequency, availability and accuracy of Estimated Landing Time (ELDT) data has been investigated. Special attention is placed on the information sharing and the calculation of the ELDT, that is calculated by Amsterdam Advanced Air traffic control system (AAA). In addition, the search for new and accurate data sources to estimate the landing time is a continuous effort. As of November, 2018, a new arrival management (AMAN) system is in use at LVNL, called Advanced Schiphol Arrival Planner (ASAP), which replaces the old arrival system, called Inbound Planning (IBP). The new AMAN has implemented different internal characteristics and processes, such as a new trajectory predictor and planning algorithm. Therefore, the new AMAN could potentially provide more accurate arrival time predictions. Both systems are compared to identify their performance.

Graduated: April 2020

Matthijs Ottenhoff (MSc) – Wind and Trajectory Uncertainty in a 4D Trajectory Management Interface

With air traffic numbers increasing, a shift in the Air Traffic Management system towards 4D flight plans, where an aircraft trajectory is pre-planned in both time and space, is foreseen. When these pre-planned trajectories are subsequently executed, unforeseen airspace perturbations, such as weather, sequencing and changing airspace constraints, will inevitably require small changes in the trajectories to be made by the air traffic controller. This perturbation management control task will consist of ensuring a safe airspace while adhering to the strict time constraints imposed by the 4D flight plan. In collaboration with LVNL, a decision support interface was designed and evaluated with the aim of visualizing possible conflict resolutions in the 4D domain. A special focus was put on the integration of wind and trajectory uncertainty information into the interface.

Graduated: March 2020

Eline Bakker (MSc) – Design and Evaluation of a Visual Interface for an En-Route Air Traffic Control Merging Task

In the past decades, the air traffic growth has resulted in increasingly complex situations involving more aircraft simultaneously. In order to guarantee safety is maintained within the increasingly crowded airspace, new solutions are expected. In collaboration with the LVNL, an Inbound Traffic Support System interface was developed. The goal of the interface is to visualize the possible solutions of an area controller’s task of merging aircraft towards a restricted waypoint in the current work domain, such that the impact of decisions made can be foreseen.  By showing the affordances of the work domain, the display keeps the air traffic controller as the active decision maker rather than issuing advisories.

Graduated: October 2019 

Femke Mollema (BSc) Creating more capacity at Amsterdam Airport Schiphol by reducing planning inefficiencies amongst KLM, LVNL and AAS

As of today, the aviation parties at Amsterdam Airport Schiphol are connected to the European network managed by Eurocontrol NMOC (Network Manager Operation Centre) through its local Airport CDM (Collaborative Decision Making) process. Within the Dutch aviation industry, many stakeholders are involved in the air traffic process, of which three of the main stakeholders are KLM, AAS and the LVNL. Each stakeholder can influence a certain part of the air traffic process, for which they create their own planning. Other parts of the air traffic process, over which a stakeholder has no control, are influenced, and planned on, by the remaining stakeholders. Since the air traffic process is a continuous cycle all stakeholders involved carry dependencies on one another, which also influences the planning each stakeholder makes. To succeed both the overall air traffic process and thus the stakeholders’ individual process, a collaboration among stakeholders is required. The goal of this research is to determine which planning inefficiencies may arise as a result of the different points of interests of the stakeholders within the Dutch aviation sector. By determining these inefficiencies, it can be researched how these can be eliminated, which could eventually benefit the capacity problem. For the purpose of this research the focus will primarily be on KLM flights.

Graduated: August 2019

Sybren Kuiper (BSc)  Evaluation of plan stability deviations in the flow at Schiphol airport

Over the last years Schiphol has experienced a growth in aircraft movements and exchange of narrow body aircraft for wide body aircraft. The infrastructure has been unable to change at the same pace increasing the pressure on the ground operations capacity and forcing the growth into the off-peaks moments where free infrastructural capacity was available. By growing in the off peaks a new challenge arose. The unused capacity was of essential value in the system plan stability. It offered flexibility that could be used to recuperate from planning deviations. The situation created, can cause a deviation from the plan to trigger a domino through the day that cannot be halted because there is no recuperation space. To stop this effect, it is essential to perform research into the current situation of the plan stability, and the exact causes that start or continue the domino effect. To do this the research will answer the following research question: “What are the opportunities for Amsterdam Airport Schiphol and the other KDC stakeholders to improve the airside ground operational plan stability of the airport?”

Graduated: August 2019

Kyara Metz (BSc)  Evaluation of peak hour capacity at Schiphol and similar airports to determine common capacity management practices

According to EUROCONTROL, Schiphol has the most significant contribution on global ATFM airport delays of all the European Airports; weather and airport capacity were targeted as primary cause of delays. Therefore, this research investigates the potential uses of holding buffers of inbound flows at Amsterdam Schiphol Airport (AAS) during peak hour of operations to absorb delays; special attention is placed on analysing the current methods employed by Schiphol and other Airports uses holding buffer not as a reactive resource for ATCs but a everyday use tool to maximize throughput on runway.

Both quantitative and qualitative research has been used to investigate which operational possibilities LVNL has to buffer inbound traffic in the Dutch airspace and to what extent these buffers can be used in managing the operational inbound peak capacity. To determine the current linear buffer capacity, 20,000 flights from July 2018 were analysed.

Graduated: August 2019

Davey Hooijmeijer (MSc)  Schiphol noise analysis for fixed arrival routings 

In this thesis research, dutch aircraft noise model (NRM) calculations are compared to measurements to analyse the aircraft classification used in the model. To do so, a new implementation of the model has been set up to calculate with LVNL trackdata and NOMOS measurement data. First, the classification approach is analysed as prescribed, which shows clustering of aircraft types when compared to measurements. After, the theoretical input data as prescribed for the model is assessed and replaced by real data for each type specific. This leads to improvements of the model calculations when compared to measurements and shows that aircraft-specific flight-information would improve the model significantly. Concluding, it is shown that aircraft noise models strongly rely on the quality of the input data. Current input data shows certain mismatches with respect to reality, resulting in differences between calculations and measurements. However, the calculations can give valuable insights in the effect of operations on the overall noise exposure.

Graduated: July 2019

Anouk Hollebeek (BSc) – Evaluation of AMAN implementation to establish improvements in the arrival efficiency

A new Arrival Management system, called Advanced Schiphol Arrival Planner (ASAP), was implemented in 2018 to regulate the arrival traffic flows at Amsterdam Schiphol Airport (AAS). ASAP aims to be an assisting support tool for the Approach Planner (APLN)  to monitor and safety merge inbound traffic flows in the Dutch Terminal Control Area (TMA). To validate the implementation of ASAP diverse analysis have been run. This work describes some recent insights and findings regarding the performance and interaction between users (ATCs) and ASAP. Particular attention is placed to establish the moment and type of interaction between the different users. The performance of the tool was evaluated using four main performance indicators; Expected Approach Time (EAT) adherence, slot adherence, holding ratio, influence of APLN.

Graduated: July 2019

Flore Wassenberg (BSc)  D-1 process impact evaluation

In 2018, it was started as part of the development of the capacity management function was the D-1 project. The D-1 project intends to provide an operational and capacity plan before the day of operation. Within the D-1 project team there is a need to validate the quality of the predicted traffic demand, because the prediction generated was not quantitatively evaluated afterward. To explore the reliability and usability of the traffic demand prediction at D-1, a bachelor thesis research has been performed. This research has been done by means of comparing the D-1 traffic demand prediction with the demand on the day of operation. The last submitted flight plans at D0 have been compared to the data predicted on D-1. The sample used contains data that was generated during a period of three months of the D-1 project trial. The research concludes that the traffic demand prediction is for parts not accurate enough to support the D-1 decision making process.

Graduated: July 2019

Casper Moll (BSc) Capacity analysis of airport slot planning and air traffic demand

According to Eurocontrol,  in 2017 Schiphol Airport was the airport with the biggest inbound ATFM delay of all major airports in Europe. One of the reasons that could cause the inbound ATFM delay is the so called ‘bunching’ effect at the border of the Dutch airspace. The objective of this research is to determine if the encountered planned bunches at -3-hour planning phase has an impact on the airport slot planning. This research focusses on the airport slot declaration and the planned demand based on the last filed flight plans, covering a period from the 25th of October 2017 till the 27th of October 2018. The analysis  contains 254,000 arriving flights in both winter and summer season. The analysis determines to which extent the bunching occurs in the airport slot declaration, and at the border of the Dutch airspace. The results reveal that bunching are present in the pre-planning phase within the airport slot declaration and is caused by the skewness within the airport slot-brackets. The analyses render similar patterns in which overdemand occurs within the time-brackets. The subsequent relationship between the airport slot planning and air traffic demand is around 48%, within the assumptions and limitations of the research. This means that 48% of the flights which are planned in a period with overdemand within the airport slot allocation, also tend to arrive in a period with overdemand at the border of the the Dutch airspace.

Graduated: June 2019

Marc Riebeek (BSc) – Comparison of airport slots and schedule & flight planning

Amsterdam Airport Schiphol is the airport with the most airport Air Traffic Flow Management (ATFM) delay in Europe in 2017. One of the causes of the ATFM delay is that airlines do not adhere to their allocated airport slots. With providing insights into deviation between flight schedules or flight plan and airport slot, causes of deviating to the airport slot are identified. This research is done by means of analysing the deviations to identify the characteristics of the deviations. In addition, interviews with airlines and a ground handler and literature about possible causes are used to provide insights. The main findings are that ~ 3.3% of the flight schedules deviate from the airport slot. The deviation between flight plan and airport slot is around 67% of arriving flights. This deviation of flight plans means that the estimated in block time (EIBT), deviates more than 5 minutes from the airport slot. Both in absolute amount and relative percentage, general aviation and cargo airlines are the business models that cause the most deviation between flight schedule and airport slot. An agreement between the general aviation ground handlers and the typical business of cargo are the main reasons for the deviation. The full-service carriers and low-cost carriers cause in absolute number, the most deviation between the EIBT based on flight plan and airport slots. If the EIBT, based on the flight plan, is earlier than the airport slot, more than 90% of these arrivals are planned earlier because of schedule buffers.

Graduated: June 2019

Mats Dirkzwager (MSc)Design and Evaluation of a Visual Interface for Separation Support in Time-Based Approach Air Traffic Control

On final approach, an Approach (APP) Air Traffic Controller (ATCo) is responsible for keeping sufficient separation between aircraft lining up on the ILS. The current industry standard is to separate these aircraft with a minimum distance, called Distance-Based Separation or DBS. European regulation requires all European airports to implement separation based on time (TBS) before 2024. Due to this implementation, effectively changing the APP ATC task from a geometrical to a time-based problem, and because of further complications such as the European Re-categorisation of aircraft types, experts fear that the theoretical gains attainable by using TBS will not be fully realised. In this research, a display tool concept to aid APP ATCos in realising the full potential of TBS, the Ideal Turn-In Point (ITIP) display is designed and evaluated with respect to the current state of the art. The ITIP display assists controllers in selecting optimal approach strategies starting from the moment aircraft enter the Terminal Control Area. The display aims to assist the operator by showing the possibilities and restrictions in the system rather than giving (restricting) advisories. In an initial proof-of-concept experiment, comparing the ITIP display to the current industry state of the art display, promising results were found; the ITIP display was shown to maintain safety and increase efficiency, whilst maintaining controller workload. The current industry state of the art display is a tool designed by the National Air Traffic Services, currently operational at London Heathrow Airport.

Graduated: June 2019

Marc Voogt (BSc) – Operational benefits since the connection of Amsterdam Airport Schiphol with the Network Manager.

Key to enabling growth at Schiphol without compromising on safety, efficiency and the environment is to increase the predictability of traffic flows. Procedures put in place by Collaborative Decision Making (CDM) support predictable traffic flows not only at Schiphol but also in the surrounding airspace of Central Europe…Research is carried out into the effectiveness of CDM since the data -connection and the impact on operational partners at Schiphol and in the EUROCONTROL  network. The data-connection is identified to have improved the accuracy of take-off time predictions at Schiphol considerably with an average monthly increase of 6% of all departing movements regarded as having a predictable take-off time. Towards the network this take-off time predictability has increased significantly. In relation to similar major-hub airports, the increased take-off time predictability and the exchange of more accurate operational planning data between Schiphol and the NMOC are identified to have contributed to the significantly high compliance to imposed take-off times (93% of all departing movements) supporting stable Network Management. Although significant increases in delay throughout the EUROCONTROL network are increasingly affecting a stable planning of aircraft parking stands at Schiphol, indications for a reduction in stand-delay and other KPIs related to improved flow-efficiency at the airport are identified.

Graduated: April 2019

Tessa Rietema (BSc) – Capacity requirements analysis of civil air traffic in military controlled airspace

The determination of the capacity of the Lelystad Terminal Manoeuvring Area (TMA) is complex and brings different challenges. The opening of Lelystad airport for civil air traffic is the motivation to perform research into the capacity of the Lelystad TMA…The aim of this research is to help CLSK to determine the capacity factors and the capacity of the Lelystad TMA…By means of interviews and expert sessions with operational experts of CLSK, data is created to use during the research. With the data, the volume and capacity of the TMA is calculated. After this, a bottleneck analysis is conducted for the capacity of the handling process. The bottleneck in the handling process is the airport with its aircraft stands. After this, the TMA is the limiting capacity compared with the runway. Additionally, the annual maximum flight movements of 4,000 and 10,000 is feasible with the structure of the TMA. When the airport becomes operational for commercial traffic, the established capacity must be validated

Graduated: February 2019

Bas Broekstra (BSc) – Impact of Special Events on Airspace

Large-scale (e.g. Tour de France, Nuclear Security Summit, etc) or other special events can mean a temporary  increase in (concentrated) traffic in the airspace. These interruptions of normal operations can have impact on the airspace capacity and air traffic controller workload. The objectives of the research is to analyse and evaluate the impact of past events, to provide insight in the capacity impact of an event. To do so, operational requirements of different events are evaluated and analysed, with the aim to provide possible improvements to be better prepared for future events. Improvement could include procedural recommendations to manage special events in the airspace, to ensure that capacity is managed in efficient ways in the future. How do current procedures, to determine the impact of special events on airspace capacity, justify the impact on operations to stakeholders in Dutch airspace?

Graduated: July 2018

Marc Eijkens (BSc) – Analysis of Vertical Flight Trajectory Efficiency

The objective of this research is to analyse the effects of the current hand-over conditions on both horizontal and vertical flight trajectory efficiency. This analysis provides insight into the significance of how the current hand-over conditions affect operational efficiency. It will present an understanding of the impact on air traffic controller (ATCo) workload when this additional coordination is carried out. Besides analysing the impact on operational efficiency and ATCo workload, the research will provide possible solutions to the problem at hand. Solutions could range from procedural changes to technical innovations which will not negatively impact/increase controller workload.

Graduated: July 2018

Gijs Peters (BSc) – Impact Analysis on the Airside Infrastructure at Schiphol

The airside infrastructure layout of AAS is very complicated, and bottlenecks are easily formed. With this growing amount of movements, bottlenecks will occur more often and influence the capacity. Every stakeholder has its own perspective on the current problems and cooperation is difficult to achieve. The research gives an overview of the current bottlenecks at the runways, taxiways and gate/buffer areas to create more awareness of the seriousness of the problem. More awareness will stimulate a better cooperation between the main stakeholders of AAS’ airside infrastructure. Also, a list of possible solutions is created.

Graduated: July 2018

Martijn Ringelberg (BSc) – Airline Strategies’ Impact on Gate Occupancy

How do airline characteristics, ranging from business model differences to variation in actual procedures, affect AAS airside capacity? Schiphol airport is reaching its limit based on the cap of 500.000 movements per year. For reaching this amount of movements a lot of capacity constraints have already been tackled, not all of them however. There are numerous airlines operating at Schiphol, and all of these airlines have various differences and equalities ranging from differences between business models to differences between pilots. The fleet size or structure of an airline for example can impact the maximum number of movements per hour of a runway as bigger aircraft need to have more separation than smaller aircraft. Another issue is the communication between airlines and airport. This may lead to congestion as the airport wouldn’t be able to plan the gate capacity well in advance. When the impacts of airline strategies are known in more detail, AAS and LVNL would be able to plan accordingly to have less capacity congestion.

Graduated: July 2018

Roel Wouters (BSc) – Impact of Local A-CDM on the Operational Efficiency at Mainport Schiphol

AAS is at the final stage of having Airport- collaborative decision making (A-CDM) completely implemented. The last step is to connect the network manager and then AAS will be a CDM airport. The network manager is currently not yet connected and, therefore, not taken into account in this study since there is not any data available yet. Local A-CDM is currently implemented at AAS which includes the four other main stakeholders (Airport operator, Aircraft operator, ATC and ground handlers). Local A-CDM should improve the stakeholders’ operational efficiency by improving the predictability and decision making.  It is likely that A-CDM has been beneficial for the operation of each involved stakeholder at AAS. However, for all stakeholders it is still uncertain how much the operational efficiency has improved thanks to the implementation of local A-CDM. The aim of this study is researching how local A-CDM has exactly improved the operation’s efficiency for each involved A-CDM stakeholder at Mainport Schiphol until now, and what the exact benefits are.

Graduated: July 2018

Huib de Jong (BSc) – How can Schiphol transition to use of APOC in an effective way?

ATC controllers are respected for their high-performance jobs, training is consistent and on high quality level, still the individual controller has the opportunity to guide air traffic in the most efficient way for that moment. An analysis of ATC decision making (taxiway, gates, runway usage, approach and take-off routing), finding deviations and variations in the operation, should determine the current way of working and should form the basis to work towards APOC. In APOC, a key difference between the current situation is the way of information sharing and availability, this difference with the current situation should be analyzed, providing the insight how to transition towards the use of APOC. The results must provide how the current decision-making process impacts capacity and to what extent can these deviations and variations be reduced when APOC is used. Furthermore, what are benefits and what are the requirements to transition to this future situation. In addition, also maintaining sufficient flexibility in the operations after the decisions have been made.

Graduated: March 2018

Remsey Kanis (BSc) – Analyses of deviations and variations in the ground operations due to runway changes

Schiphol has the most runways in Europe with respect to major hub airports, this does not automatically translate to the highest ATMs. During the day runway use is changed, primarily because of the noise restrictions surrounding Schiphol. An analysis of the impact on the capacity on the ground and in air, is needed to determine, how this already complex change of runways also increases the complexity in other parts of the system. Included in the analysis the effect on TATs can be determined possibly through A-CDM data, also information from the ORS (Omgevingsraad Schiphol) must be considered as input. The results must provide an effect analysis on specific parts of the system and the reasoning, the related stakeholders need to be covered also the cost and benefits in operational sense need to be addressed.

Graduated: March 2018

Joep Boekhout (BSc) – Analysis of the effectiveness of the limitation/regulations in controlling airspace towards and from Schiphol

Air traffic controllers find the most efficient way to align aircraft towards the runway, maintaining separation requirements, trying to prevent delays, choosing the most fuel-efficient routes for airlines from and to the airport. Although in some cases regulations in the airspace are deemed necessary to cope with an increase in demand, on top of that pilots (airlines) tend to defeat the system by asking for directs (deviations), instead of following the rest. In addition, relaxing some airspace constraints did not have the effect of a higher utilisation of the airspace. The analysis should provide insight in the effectiveness of limitation/regulations used in the airspace. Possible input can be an aircraft priority study (KLM), that provides the airline with information which aircraft to speed up or slow down. The results of the research must provide air traffic controller with the impact of certain regulations and also airspace users with the insight on how their decisions impact the whole system. Included should be at least a list of the most used regulations with their impact/effectiveness and deviations by users including their impact as well. The customer wants to get insight in the current effectiveness of Network Manager regulations, and in particular the effect of airline/pilot behaviour on the effectiveness of regulations.

Graduated: March 2018