in Aerospace

Enhanced TBS adds resilience to Heathrow operations

Posted 15 November 2018 · Add Comment

The use of Time Based Separation (TBS) for London Heathrow arrivals is continuing to deliver major operational improvements, with the latest analysis revealing the added benefits of new tools introduced earlier this year.

In March, an enhanced version of the system – eTBS – was brought into service by NATS, bringing with it a more refined set of wake categories developed by Eurocontrol, as well as new separation tools. These enhancements have helped make the operation more resilient against delays and disruption.

The first four months of eTBS operations saw a tactical capacity gain of approximately 1.4 additional aircraft landings per-hour in all wind conditions, with an additional 1.6 arrivals in strong headwinds over and above the 0.8 additional landings (2.6 additional in strong winds) already achieved by the original TBS.

That is the equivalent of extending Heathrow’s operating day by 30 minutes, delivering valuable operational resilience that helps ensure the airport can deliver to plan, airlines can keep to their schedules and local communities are not affected by late running arrivals.

Heathrow is capped at 480,000 movements per annum so this additional tactical capacity is all translated into improving on-time performance and a better passenger experience.

Allison Bates, Head of Air Traffic Management at Heathrow said: “Given our current capacity constraints, we’re always keen to launch new and innovative processes that increase our airport’s resilience and we are very excited to have worked with NATS to introduce Enhanced Time Based Separation. By doing this, we’ve been able to boost our punctuality, offer more certainty to our passengers while cutting aircraft emissions and reducing late runners for local communities. We will continue to work with NATS and the wider industry to facilitate more changes such as these that modernise aviation.”

Pete Dawson, NATS General Manager at Swanwick Control Centre, said: “It’s always a challenge to introduce new technology into our busy operation, but these results have exceeded our expectations. It means we’re strengthening the airport’s ability to cope during disruption; improving the passenger experience; and reducing airborne holding, which means a cut in noise and emissions.”

Heathrow is, so far, the only airport in the world where arriving aircraft are separated using dynamically calculated time internals, as opposed to set distances. This allows them to be adjusted in real-time to suit the prevailing wind conditions and help maintain the landing-rate.

The original TBS  - developed as a result of SESAR research - was first introduced for the Heathrow final approach operation at NATS Swanwick control centre in 2015, where it immediately delivered substantial improvements in resilience by reducing headwind delays by over 90,000 minutes a year, a fall of 62%.

The eTBS still shows wake pair markers or separation indications to the approach controllers but now also models the compression between each arriving pair as they slow down on final approach. A runway occupancy indicator for pairs of arriving aircraft is also displayed when the time spent getting off the runway is more limiting than wake separation.

NATS intends to continue adding tools and refinements to the TBS system, creating a suite of functionality it calls ‘Intelligent Approach’. The next step will see the introduction of Pairwise Separation, where every pair of aircraft type will have its own separation standard as opposed to the six categories used today and optimising the gaps between arrivals and departures at single runway airports.

* required field

Post a comment

Other Stories
Latest News

Loganair awarded Derry to Stansted PSO route

Loganair has been selected as the new operator for the Public Service Obligation (PSO) contract to secure Derry’s sole air service to London, following the weekend’s news that previous operator flybmi has entered insolvency.

Teacher engineers herself a career change

One young woman from Ballyclare has engineered herself a new career.

IATA releases 2018 Airline Safety Performance data

The International Air Transport Association (IATA) released data for the 2018 safety performance of the commercial airline industry showing continuing safety improvements over the long term but an increase in accidents compared to

PTC and IFS partner on field service management for A&D

IFS and PTC today announced they have entered into a definitive agreement for a strategic collaboration expected to increase value for customers who differentiate their brand on service excellence and asset readiness across

T1 trainer makes first flight at RAF Valley

The first flight of the Texan T1 training aircraft has been completed at RAF Valley.

NSC extends JSCSC service

Simulation, training and consultancy specialist NSC is to stretch its unbroken service to the UK Defence Academy’s Joint Services Command and Staff College (JSCSC) beyond the 21-year mark.

ODU 0201311219
See us at
Aviation Africa 2019Airborne ISR & C2 Battle ManagementSMIFAVWS BT1302060619