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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.

EU exit

Please note that, in the event of UK participation in EASA and mutual recognition of licences and certificates ceasing, some CAA website content and application forms may continue to carry the EASA logo or reference the EU or EASA rather than the UK CAA in the short term.

These will be updated in due course following the outcome of the transition period negotiations on the long-term aviation relationship between the UK and the EU. In the meantime, the guidance provided and the application forms accessed via the CAA website portal will continue to be valid

Maintenance Organisations may hold an approval from the Federal Aviation Administration (FAA) to maintain aircraft or components for aircraft that are registered in the United States of America.

A Bilateral Agreement between the UK and the USA was signed on 20 December 1995. The Agreement means that the UK CAA will undertake the oversight of organisations that hold UK Part 145 approval and FAR 145 Repair Station Certification.


  • Organisations must hold a valid UK Part 145 approval.
  • Where approval for a Part 145 is being sought at the same time, the Part 145 approval must be in place before the FAR 145 Repair Station Certificate can be recommended.
  • The organisation must be able to demonstrate a need to hold a FAA Repair Stations Certification and provide written evidence from intended customers of an intent to use the applicants services.
  • At the time of submitting the FAA Form 8400-6 Pre Application Statement of Intent, the organisation must not have any open audit findings against the UK Part 145.

How much does it cost?

Airworthiness Application Charges.

  • The charge for A1/B1 ratings is £3,440
  • The charge for B2/B3/C/D ratings is £2,580

How long is it valid for?

  • Unless expired, revoked, suspended or cancelled FAR 145 Repair Station Certificates are initially valid for 12 months and then renewed every 24 months after the first renewal.

What else do I need to know?

  • FAA Form 8400-6 Pre Application Statement of Intent.
  • FAA Form 8310-3 Application for Repair Station.
  • Maintenance Annex Guidance (MAG).
  • What is a bilateral agreement (including a link to the MAG).
  • Repair Station Vital Information - the requirements are set out in the MAG.
  • FAA website
Close What else do I need to know?

What do I need to include in my application?

Step 1

  • A completed online application form
  • FAA Form 8400-6 Pre Application Statement of Intent (PASI)
  • Completed Repair Station Vital Information

Once you have received a pre-certification number from the FAA, we will contact you and ask you to provide the following:

Step 2

  • FAA Form 8310-3 Application for Repair Station Certificate
  • A statement of need which may be a letter or documentation from potential customer to demonstrate an intention to use the service to be provided
  • FAA Supplement to the MOE
  • Letter to confirm employees have received Hazardous Materials training if applicable
  • List of addresses of all additional fixed locations
  • List of each line station and name of air carrier or operator

Note: If making a simultaneous application for a Part 145 approval, the relevant submission should be made at the same time.

Close What do I need to include in my application?

How do I apply?

  • Online application form
  • You should familiarise yourself with the MAG and obtain written evidence of need from the intended customers, before completing the forms and documents listed above under 'You will need to provide".
  • Your application should then be sent to apply@caa.co.uk

Note: Applicants can also apply for a joint FAA & TCCA Approval

Close How do I apply?

What happens next?

  • We will review and log your application and process the application fee.
  • We will check the records to ensure a valid UK Part 145 approval is held and there are no open audit findings for that approval. If there are open findings, the application will be placed on hold until the organisation notifies us that the findings have been closed.
  • You will receive confirmation that we have received your application.
  • We will forward the Form 8400-6 and Repair Station Vital Information to the FAA for review and provision of an FAA Designator reference.
  • The FAA will review the application and if it is acceptable we will be advised of a pre-certification number and FAA Designator.
  • We will receive confirmation of the pre-certification number to be used during the approval process and the FAA Designator (the reference to be used once approved).
  • The regional office conducts initial certification investigation. Findings are raised if necessary.
  • The applicant closes any audit findings that may have been raised.
  • When able to the regional office will make recommendation for the issue of the Repair Station Certification. The recommendation pack will be submitted to us.
  • We will forward the recommendation to the FAA.
  • The FAA will review the recommendation and invoice you for the issue of the Repair Station Certificate.
  • The applicant then sends payment to the FAA.
  • The FAA will issue the FAR 145 Repair Station Certificate and Ops Spec. Two copies will be sent to you and a copy will be sent to us.
  • You sign the FAR 145 Repair Station Certificate and Ops Spec and return one copy to the FAA.
Close What happens next?

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