Deviations by ground handling staff

A missed approach is considered a standard procedure. An aircraft can come into conflict with departing air traffic when it has to execute a missed approach and a converging departure runway is being used. Air Traffic Control the Netherlands (LVNL) and its partners have been investigating how they can further increase the safety of this procedure.

Timing appears to be an effective measure to reduce the risk of converging approach and take-off operations. By ensuring there is adequate time between these operations we can further decrease the risk of conflicts occurring.

It was decided to implement timing for all converging runways, taking into account the geometry for each of the converging runway combinations. Air Traffic Control the Netherlands (LVNL) will develop dedicated training for the runway controllers focusing both on conflict prevention and resolution.

The European Union is improving the use of European airspace under the project name ‘Single European Sky ATM Research’, or ‘SESAR’. As part of this project, approaches based on satellite technology (RNAV) are implemented at Schiphol. This allows aircraft to carry out an RNP Approach which involves using three-dimensional GPS navigation on the approach to a runway. As of 7 November 2019, an RNAV approach is possible for four runways at Schiphol. The navigation technology makes flight paths for approaching aircraft more predictable, which will reduce the likelihood of any in-flight safety incidents. A date for evaluation will be planned.

Air Traffic Control the Netherlands (LVNL) has raised the upper limit of the Schiphol Terminal Manoeuvring Area (TMA). The TMA is the airspace controlled above and around the airport by air traffic control. By taking these measures, we will utilise a standard method to enable the desired flight profiles. In this way, we will increase the predictability approaching aircrafts’ flight paths, and reduce the complexity of the airspace.

Air Traffic Control the Netherlands (LVNL) has successfully introduced electronic flight progress strips for air traffic controller workers. This digital system reduces the workload for air traffic controllers. In addition, this electronic method enables extra safety nets to be created. It is established that the redesign of work stations in the Control Tower is in place and used.

During adverse weather conditions, like thunderstorms and storm, or (heavy) fog, all ground handlers need a clear procedure. Schiphol and its partners have implemented a standard procedure that increased the predictability and uniformity of ground handling operations in order to reduce the likelihood of on-ground safety occurrences.

During the day, there used to be one or two ground controllers in Tower Centre and one in Tower West near runway 18R/36L (Polderbaan). Air Traffic Control the Netherlands (LVNL) has added a third ground traffic controller to the crew at the Central Control Tower, depending on air traffic volumes. This reduces the workload of ground controllers and the likelihood of runway incursions and on-ground safety incidents.

Air Traffic Control the Netherlands has redesigned work stations in the Tower. This allows air traffic controllers to work at positions that have the most favourable view over their areas of control, thereby reducing the likelihood of safety occurrences in the air and on the ground. It is established that the redesign of work stations in the Control Tower is implemented.

Aircraft following the routing to the beginning of runway 18L (Aalsmeerbaan) pass intersection N2/E6. At that point, the traffic crosses runway 09 (Buitenveldertbaan).

Schiphol and its partners constructed a runway stop bar in order to prevent aircraft that erroneously turn right from taxiing via the Buitenveldertbaan runway towards departing traffic. This will reduce the risk of runway incursions.

ISMS partners jointly investigated a safety incident in 2018, which happened between a towed aircraft and a marshaller in the field. As a result, Schiphol and its partners have already taken a number of further measures, such as tightening up the procedure, to reduce the risks of marshalled towing. The tow drivers are trained and qualified for the new 2021 standard. The manual has been changed with a clear instruction for tow drivers on the operational procedure. We have also reduced the need to marshal towing movements, thus reducing the risk of safety incidents with marshalled tows.

In 2016, an Embraer departed from the edge of the Kaagbaan (runway 24). Directly after the incident, Schiphol extended the taxiway centre line marking towards the runway centre line. The Dutch Safety Board (OVV) published a report in November 2018 about this incident, which included recommendations. As a result of this report, ISMS partners have changed the markings and guidance lines to reduce the risks associated with misaligned takeoffs.

Link to report

Bron: Report ‘Misaligned take off’ by OVV

ISMS partners jointly investigated a runway incursion in which an aircraft was cleared to enter the Zwanenburgbaan (Runway 18C), while another aircraft had permission to depart to the south. The study brought a number of measures to light which may further reduce the risk of incorrect line-ups. For example, the sight lines from the Control Tower may be improved. We have also conducted further research into the ways of working and operational procedures when taking-off from the Zwanenburgbaan Runway (18C). The measures are being worked out further and are being implemented.

On February 15 and July 9, 2019, two aircraft had a collision during a pushback manoeuvre. ISMS partners jointly investigated these pushback accidents.
The task force has implemented four measures which prevent pushback accidents. The long pushback procedure was refined and the responsibilities of the ground controllers and the pushback drivers were clarified. There are fixed pushback and release points on taxiway Alpha and for non-standard pushback clearances. A date for evaluation will be planned.

The Uniform platform was expanded from 5 to 9 parking spaces by Schiphol and its partners. Three additional parking spaces have been created for wide body aircraft. This reduces bottlenecks in parking spot allocation and relieves gate planning, which thereby reduces the risk of on-ground safety incidents. In addition, aircraft will be serviced at the total of 12 parking spots. That means they will cross the Aalsmeerbaan Runway (18L/36R) less frequently, thereby reducing the risk of runway incursions.

Air Traffic Control the Netherlands (LVNL) has created an extra safety net so that air traffic controllers receive a digital warning if they want to use a runway that is not currently in use. An additional warning will follow if the air traffic controller then gives permission to take off or land on that runway. These warnings prevent planes from taking off or landing on runways that are not in use.

On 6 September 2019 an aircraft attempted to take off from a taxiway instead of the Zwanenburg Runway. A number of measures to prevent this from occurring again were immediately implemented. For example, the standard night taxi route has been changed and the location has been identified as a hotspot where pilots and air traffic controllers are required to be extra alert. The markings that guide pilots towards the runway have also been made clearer and new lightings at runway entries, Runway Guard Lights, have been implemented. Lastly, awareness programs for flight crew and ground controllers are launched.

In 2023, ISMS will evaluate these measures.

ISMS partners jointly investigated an incident in which a towed aircraft collided with the passenger bridge on a stand. Based upon this investigation a system is being developed so that when parking a towed aircraft, it is easier to see exactly where to stop.

The measure is implemented, the correct stopping positions are published on the Airport Community App per May 1st 2023. In the future, this measure will be evaluated.

Schiphol consulted its partners in order to create together a License to Operate (LTO) for Generic Ground Handling Service Providers at the airport. The LTO defines the minimum safety, quality, and operating standards for the ground handling operation. The content was drafted with the involvement of Ground Handling Service Providers, contributing to the shared goals: a safe and healthy workplace for all employees, reliable and excellent performance and sustainable operations. As a result, a level playing field is achieved and clarity is offered on the minimum quality level for ground handling. As per January 1st, 2023 the LTO is effective. The LTO will be further developed on a yearly basis.