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UK – EU Transition, and UK Civil Aviation Regulations

To access current UK civil aviation regulations, including AMC and GM, CAA regulatory documents, please use this link to UK Regulation. Please note, if you use information and guidance under the Headings below, the references to EU regulations or EU websites in our guidance will not be an accurate information or description of your obligations under UK law. These pages are undergoing reviews and updates.


Truncation of Heathrow WOBUN and BUZAD SIDs PIR


Last updated: 21 April 2021

Airspace change implementation date 24/05/2018
Post Implementation Review (PIR) initiation date 17/04/2020
PIR Feedback form (sponsor submission) 21/04/2020
CAA review 28/04/2020
Sponsor document provided for the PIR assessment
  • 18/01/2021
  • 04/02/2021
Completion of CAA PIR formal assessment 31/03/2021

Post Implementation Review

The purpose of the Post Implementation Review (PIR) is for the CAA, as the independent regulator, to assess whether the change has delivered the anticipated impacts and benefits set out in the original Airspace Change Proposal (ACP) and decision, and if not to ascertain why and determine the most appropriate course of action.

Publication of our report

The CAA has completed the PIR of the Heathrow WOBUN / BUZAD SID Truncation airspace change proposal. Truncation of London Heathrow WOBUN and BUZAD SIDs (ACP-2017-73) – Post Implementation Review (CAP2133) describes the outcome of the PIR.

As a result of our analysis, the CAA has concluded that the Heathrow WOBUN / BUZAD SID Truncation PIR does show that, following the implementation of additional mitigation actions, the proposal has been implemented and operated as expected.

The CAA’s airspace change process for the Heathrow WOBUN / BUZAD SID Truncation airspace change request has now concluded.


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