The aim of UK airspace modernisation is the delivery of quicker, quieter and cleaner journeys and to create more benefit for those who use and are affected by aviation. This is co-sponsored by the Government & Civil Aviation Authority (CAA), whose Airspace Modernisation Strategy (AMS) outlines the initiatives needed to deliver modernisation.

Future Airspace Strategy Implementation – South

FASI South (Future Airspace Strategy Implementation – South) aims to upgrade the airspace structure and route network that serves London and the Southeast of the UK. Together, the industry is working to deliver FASI South through a coordinated programme of Airspace Change Proposals (ACPs).

The airports participating in FASI South are responsible for upgrading the arrival and departure routes that support their operations from the ground to 7,000 feet, with NATS En Route Limited (NERL) responsible for upgrading the airspace structure and route network above 7000 feet.

Coordinated Airspace Change Proposals

The Airspace Change Organising Group (ACOG) was established to manage the programme as part of an overall masterplan, recognising the scale of the proposed upgrades, the number of organisations involved and the complex interdependencies between the constituent ACPs.

In 2018, NERL produced a feasibility report on behalf of the Government identifying Farnborough Airport as one of nine airports in the London Terminal Manoeuvring Area (LTMA) with significant route interactions. The report concluded that these airports should form part of the minimum group of coordinated ACPs included in the Masterplan to deliver the benefits of modernisation.

The existing Masterplan (Iteration 2) did not include Farnborough Airport because we were not developing a live FASI-S ACP when ACOG produced the content for the plan in Q3/Q4 2021. This was due to the fact that we had recently implemented an ACP.

Whilst this ACP has met its objectives, (subject to the Post Implementation Review), constraints associated with the surrounding airspace within the LTMA continue to limit the environmental performance of inbound and outbound traffic flows to and from the airport, especially the ability for the new routes to deliver Continuous Climb Operations (CCO) or Continuous Departure Operations (CDO).

The majority of these limitations arise from the interdependencies between Farnborough’s routes and Heathrow and Gatwick operations. As a result, the volume of Controlled Airspace required to safely contain the routes into and out of Farnborough is relatively large and extends for some miles from the airport.

Aiming to deliver quicker, quieter & cleaner journeys

To capitalise on the opportunity Farnborough Airport has decided to start a new ACP, joining the FASI South programme, which will help to deliver the airspace modernisation objectives of quicker, quieter & cleaner journeys.

The widescale airspace upgrade planned for the LTMA through the FASI South programme present an opportunity to potentially improve:

  • CCO/CDO performance
  • Reduce volume of controlled airspace
  • Optimise the overall flow rates into Farnborough
  • Manage adverse effects of aircraft noise & overall emissions
  • Create the capacity for efficient growth, appropriately manage the adverse effects of aircraft noise and to reduce CO2 emissions

Update 15th November 2022

The Farnborough FASI-S ACP is now in Stage 1 and can be followed on the CAA website Airspace change proposal public view ( where all relevant documents, together with the timeline, are lodged in accordance with the Airspace Change Process (CAP 1616).

CAA PIR assessment

Airspace Change Proposals Post-Implementation Reviews (PIRs) impacted by COVID 19

Confirmation of the commencement of Farnborough Airport’s PIR

As communicated at the October 2021 FACC, the CAA committed to undertaking a further review in February 2022 and we can now confirm that Farnborough Airport will commence their ACP PIR on 1st April 2022.

Any questions regarding the Post Implementation Review process then please contact us at in the first instance. Please note, if you are submitting a response regarding the ACP PIR process then please be advised that all responses received will be held on file in line with our privacy policy, which can be accessed here, and will be submitted to the CAA at the end of March 2023 in line with their CAP1616 requirements, we are unable to respond to individual emails.

The CAA will confirm the data that it requires FAB to collect as part of the PIR process on the  23rd March and once this is received we will post this here.

Frequently Asked Questions – November 2022 – Review being undertaken

ACP-PIR Update – July 2022

PIR Confirmation of Data Requirements – April 2022

PIR Commencement Update – March 2022

Click here to read the update – February 2022

Click here to read the update – October 2021

Background of Farnborough Airport’s ACP

Here are a series of documents to aid your understanding of these changes and the impact it will have on your ability to use Farnborough Airport.

  1. The AIP extract for EGLF that will become valid on 27th February 2020. Please note the Flight Procedures section AD2.22
  2. The AIC that went live on 16th January 2020 notifying aircraft operators of the new airspace structures.
  3. Two maps showing the airspace and SIDs and STARs.
  4. A short briefing slide pack on the changes focusing on Class E Rules.

The CAA has provided an update which has been written to provide a comprehensive guide to the Class D and Class E Farnborough controlled airspace which became effective on 27th February 2020.