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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 UK Part 66 Aircraft Maintenance Licence holders wishing to add a category or sub-category to their existing licence.


You must hold an existing UK Part 66 Aircraft Maintenance Licence and have met the relevant knowledge and experience requirements to extend to include another Category/Sub-Category.

The UK Civil Aviation Authority (CAA) reserves the right to ask any applicant to provide the original documents to support any application for the initial issue, renewal or change to a UK Part 66 licence.

When extending a UK Part 66 Aircraft Maintenance Licence you are required to complete the relevant modules applicable to the Category/Sub-Category you are applying for (for information on the modules/part modules you will need to email eldweb@caa.co.uk).

Please note the EU/EASA Certificates of Recognition (CofR) may continue to be acceptable for inclusion on an UK Part-66 licence dependant on the date of issue:

  • Any EASA Certificate of Recognition issued by an EU Part 147 MTOA (with a Form 11 dated during the two-year saving legislation period) - will be acceptable in support of UK Part 66 Licence. The course start date cannot exceed more than three years at the time of applying for the type rating.
  • Any EASA Certificate of recognition issued by an EU Part 147 MTOA dated after 01 January 2023 will not be acceptable in support of a UK Part 66 Licence.

The EU/EASA Organisation approval certificate valid at the time the course was completed along with the CofRs must be submitted to support applications.

You will be required to provide the necessary amount of practical aircraft maintenance experience on operating aircraft in compliance with UK AMC 66.A.30(e) in a form and manner acceptable to the UK CAA, appropriate to the additional Category/Sub-Category of licence applied for, signed off by the appropriate signatory.

An acceptable format for demonstration of experience can be any of the following:

The experience requirement will be reduced by 50% if you have completed an approved Part 147 basic training course relevant to the Category/Sub-Category applied for.

The recommendation document will need to be completed by a Quality Manager or the immediate senior person within the Quality Department of your current employer, or the organisation where the experience is gained.

Please note if you are applying for a change of name and/or nationality you will be required to supply evidence in support of your request, for example, change of name deed poll/marriage certificate/valid passport.

How do I apply?

Once all of the requirements have been met, please complete:

  • SRG 1014 (if applying using a paper form)
  • Online application

    The application, supporting documents and original licence should be posted to:

    Civil Aviation Authority
    Aviation House
    Licensing Assessment Team
    Beehive Ring Road
    West Sussex
    RH6 0YR

What do I need to include with my application?

You will need to include the following information with your application:

  • Application for Initial Issue, Amendment or Renewal of an Engineer Licence.
  • For existing licence holders your original UK Part 66 Aircraft Maintenance licence will need to be submitted with any application for amendment or renewal of an engineer's licence.
  • Certified true copies of the appropriate Exam Certificates completed for the additional category/sub-category applied for.
  • The EU/EASA Organisation approval certificate valid at the time the course was completed.
  • Certified true copies of the logbook/worksheets showing the evidence of the practical maintenance experience gained.
  • The Recommendation attachment ensuring that it has been completed by your Quality Manager in support of your application (the recommendation can also be completed by: Part 145, FAR 145, CAMO, CAO Post holder or UK Part 66 licence holder).
  • If applying for change of name and or nationality a certified true copy of the supporting document, for example, your valid passport/change of name deed poll/marriage certificate.

From 28 September 2012, where practical experience is gained outside of a Part-145 or Part-M approved maintenance organisation, the applicant is required to submit confirmation from the National Aviation Authority (NAA) responsible for the maintenance organisation concerned, that the organisation is approved under the national regulation for the maintenance activities stated and that the signatory in Form 19 is a member of that maintenance organisation.

Certified true copies of documents

Postholders of a Part 145/147/MG/CAMO/CAO Organisation or another UK Part-66 licence holder can act as certifiers for all documents.

Postholders of a Part 145/147/MG/CAMO/CAO Organisation or another UK Part-66 licence holder or official bodies such as the post office or solicitors who provide this service can act as certifiers for ID Documents (Passport or full UK driving licence):

Instructions for the certifier of your ID document are as follows:

  • Insert on the copy to be enclosed with the application: 'I have seen the original document and I certify that this is a complete and accurate copy of the original'.
  • Insert signature and date
  • Certifier's name must be printed in block capitals
  • Must include position or capacity, for example, Head of a Part 145/147 Organisation.

How long is it valid for?

The UK Part 66 Aircraft Maintenance Licence is valid for 5 years from the date of issue.

How much does it cost?

The fee is £410.00 per Category/Sub-Category applied for. 

If you are applying for any other additional services, the appropriate fee will also apply.

An additional fee will be payable if you wish your documents to be returned by secure courier.

The current Scheme of Charges (Personnel licensing) provides further information.

Applications and documents posted from outside the UK

When submitting applications or documentation via post/courier to the UK please ensure that you complete the import declaration on any package in the correct manner.

Please ensure that you enter the “Value” of the package content as zero/nil. Otherwise, this will generate import duties in the UK which will be re-charged to you.

While there is a fee for the Civil Aviation Authority (CAA) application process, this does not represent an importation value of the package content. Therefore, the application fee should not be stated on the import declaration form that a candidate completes when posting supporting documents to CAA UK.

Same day services

Same day, special and customised delivery charges are available at an additional cost. This service is on request, which should be made at the time of initial application. Documents are worked to a same day turnaround from receipt of customer request by 11:00 to completion of the processing of the application by 16:30 on the same working day. The customer will be able to collect the documents by 16:30 on the same day or the documents shall be sent by Royal Mail special delivery, where this is included in the service.

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Refunds – rejected or withdrawn applications

There have been a number of applications received from Aircraft Maintenance Licence (AML) applicants applying for issue of an AML or for additional privileges to be added to an existing AML which have been rejected by the Civil Aviation Authority (CAA) due to, for example, lack of experience criteria. This has resulted in the CAA refunding 100% of the application charge paid even though CAA time has been incurred to review the application in order to reach the rejection decision.

The CAA is required to recover its costs from those that have caused those costs to be incurred. Therefore, for applications received from 15 September 2016, the CAA will deduct £218 to recover the average costs of its application review, in respect of those applications that the CAA has rejected or where the applicant has withdrawn his/her application before the CAA has completed its review.

This deduction is associated with applications in respect of AML activities under the UK Official Record Series 5 , Personnel Licensing Scheme of Charges. This action is in line with the CAA Charges Waiver and Refund Policy.

Close Refunds – rejected or withdrawn applications

What happens next?

  • The assessment of your application is completed by a Licensing Officer and technical standards surveyor.
  • Following an acceptable assessment the Licence is then processed, signed and dispatched to the individual.
  • We will contact you if we have any queries regarding your application and may keep your application pending for 30 working days awaiting any additional documentation to be submitted.
  • A refund fee may be charged if the assessment results in the rejection of your application. This will also be applied if you choose to cancel your application.
Close What happens next?