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UK Civil Aviation Regulations

These are published by the CAA on our UK Regulations pages. EU Regulations and EASA Access Guides published by EASA no longer apply in the UK. Our website and publications are being reviewed to update all references. Any references to EU law and EASA Access guides should be disregarded and where applicable the equivalent UK versions referred to instead.

This page provides information to applicants wishing to apply for a UK Part 145 approval to maintain UK registered Part 21 aircraft and/or the engines and components fitted to them.


Organisations should have their principal place of business in the UK.

Organisations with their principal place of business located outside the UK, should apply for a UK Third Country Approval.

Organisations needing to change a Registered Company or Limited Liability Partnership (LLP) Number will require a new initial approval as it cannot be classed as a change to an existing approval. Leaflet C-30 (CAP 562) provides further information.

If adding an aircraft which falls within a generic aircraft group that you already hold on your approval certificate (for example, piston engine aeroplanes – metal structure not exceeding 5700 kg), then you should email an exposition amendment to apply@caa.co.uk or attach/upload the draft exposition to the online application form (where applicable). Please do not send to your surveyor directly as it will delay your application processing.

How do I apply?

Complete the Part 145 online application form.

Unfortunately, our online application form is limited to only letting organisations add up to 6 types on the application form. In cases where organisations wish to add more types, we kindly request that you submit your application online with as much detail as you can, and then follow up with an email listing all of the types you want on your approval. The email should be sent to apply@caa.co.uk and should quote the online application reference number.

What do I need to include with my application?

  • A completed application form submitted by an Authorised Representative of the Company, for example, the proposed Accountable Manager.
    (Aircraft ratings should be listed as per UK Part-66 Type Rating List. At this time, the Part 66 listing does not include Sailplanes, Powered Sailplanes or Balloons. In this case, use the aircraft type designation specified on the UK Type Certificate Data Sheet.)
  • A minimum of one CAA Form 4 for key personnel, for example, Quality Manager. Additional Form 4s may be requested by your allocated Civil Aviation Authority (CAA) surveyor. Please ensure that the CAA policy on fitness of character is fully understood before submission of an application. Additional Form 4s may be requested by your allocated CAA surveyor.
  • A draft copy of the Maintenance Organisation Exposition (MOE).
  • See Part 145 Maintenance Organisation Exposition Guidance.
  • A completed MOA compliance checklist.
  • A completed UK Regulation (EU) No 376/2014 Compliance Checklist.
  • A draft copy of the Capability List if not included within the (MOE).
  • A completed SRG1760 form (Principal Place of Business Key Facts form) if your organisation is trading as a registered company.
  • A completed organisation Internal Audit Report (including objective evidence) to confirm the organisation is compliant and ready for the CAA audit.
  • A copy of the company Certificate of Incorporation if your organisation is trading as a registered company.
  • Payment of the relevant fee.

How much does it cost?

The Official Record Series 5, Civil Aviation Authority (CAA) Scheme of Charges provides further details.

If you apply for an initial approval with multiple ratings under the same approval type, you must include a payment relating to the charge for the highest rating applied for, for example, a Part 145 application for ratings A2, A3 and B1 would attract a single charge for the highest rating, being the B1, as per the Scheme of Charges.

In the event of a discrepancy between the information here and the Official Record Series 5, CAA Scheme of Charges (Airworthiness, Noise Certification and Aircraft and Aircraft Engine Emissions), the Scheme of Charges takes precedence.

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How long will it take for my application to be processed?

When the Organisation Approvals team receive the recommendation from Airworthiness confirming the organisation has achieved the required standard, the approval certificates will be raised and sent to your organisation within 20 working days.

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How long is it valid for?

Once granted, a Part 145 approval requires a recommendation for continuation every 24 months from the date of initial issue. This is raised by the Civil Aviation Authority (CAA) Surveyor following a satisfactory audit programme.

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What happens next?

The following information advises on what will happen to your application next:

  • An automated email receipt following submission of your online application form.
  • An e-mail to confirm your provisional Part 145 approval number normally within 10 working days.
  • The Civil Aviation Authority (CAA) Resource Scheduling Team will contact you to arrange for a Surveyor to carry out an on-site audit.
  • Any questions regarding the scheduling of your on site visit can be directed to the Resource Scheduling Team at 0330-0221908.
  • An Airworthiness Surveyor will conduct an audit against the requirements and any audit findings will be raised in an audit report.
  • The Airworthiness Surveyor will review the nominated personnel. Interviews for key personnel may be carried out.
  • If findings have been raised, the organisation should address all the findings and notify the Surveyor of the actions taken.
  • Once any audit findings relating to the initial application have been closed, the Airworthiness Surveyor will submit a recommendation to the Organisation Approvals Team for the issue of the approval.
  • Your organisation can begin to undertake and release maintenance once you receive the certificate.
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