Following the UK’s exit from the EU on 31 January, a transition period will apply until 31 December 2020. During this period, the UK and the aviation sector will continue to follow EU law and to participate in the European Aviation Safety Agency (EASA) system. As a result, businesses and individuals operating in the UK should see no change to existing conditions during the transition period, while the longer-term UK-EU relationship on aviation is determined. Please see the homepage for further details.

A fuller outline of the position as the UK enters the transition period is available here. While the respective positions outlined in the UK Government and EU negotiating mandates indicate what both sides want in terms of future agreements on air transport and aviation safety and security, the conditions that will exist after the end of the transition period are still uncertain.
As the UK-EU negotiations move forward and more information becomes available, the CAA will update these FAQs and notify stakeholders of the updates through the SkyWise alert system. If you haven’t already done so, please subscribe to the EU exit category in the SkyWise system:

After the UK’s membership of the EASA system ceases at the end of the transition period and if there is no mutual recognition of safety certificates between the UK and European systems, organisations that require approvals for equipment to be installed on aircraft under Part 21 Subpart O might need to take action to maximise continuity and stability for the aviation sector. The actions required would depend on individual circumstances and are a matter for each business and individual to consider. This page sets out what you need to consider to prepare for such an eventuality.

Technical Standard Order (Part 21 Subpart O)

Would the CAA duplicate the existing Technical Standard Order/European Technical Standard Order systems in the UK if UK participation in EASA and mutual recognition cease?

Except in the case where appropriate TSO/ETSO standards do not already exist, the CAA does not intend to generate equipment specification requirements separate to ETSO and TSO for a two-year time-limited period. We would adopt the standards currently in CS-ETSO for any applications during that time.


My organisation holds Alternative Procedures to Design Organisations (ADOA) under Subpart O from EASA and issues data to UK Production Organisations (POA) for manufacture and release. Do I need to apply for a UK AP to DOA to continue to do this if UK participation in EASA and mutual recognition cease?

If this scenario came into effect, EASA ADOA data (including minor changes under Subpart O) would be accepted for manufacture under a UK POA for a two-year time-limited period, and permanently after that date provided that the design data had not changed.

If at the end of the two-year period, there remained no agreement for acceptance of EASA approvals, and there was a need to make such a design change, existing ADOA organisations would need to make an application to the CAA to continue to manufacture under a UK POA.

ADOA organisations wishing to make major changes or to make new applications for equipment approval during the two-year time period would need to seek UK ADOA approval to manufacture under a UK POA under the Scheme of Charges then in force.


If my ADOA continues to be accepted, what would be the effect of the UK being outside EASA without mutual recognition on my current ETSO arrangements?

UK POAs would no longer be able to release your equipment/appliances using an EASA Form 1. From the date UK participation in EASA and mutual recognition ceased, the POA would have to make releases via a CAA Form 1. Please refer to the dedicated Aerospace Production Organisation section of the microsite for further details of the options available for production organisations.


How could my organisation make major changes requiring a new Part Number or make an application for new equipment approvals if the UK was outside EASA without mutual recognition?

Your organisation would need to make an application to the CAA for ADOA to support a release under a UK Part 21G. Note that if the appliance is also going to be released under an approval issued by EASA, a corresponding change would also need to be approved in the EASA system.