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Organisations must have On the Job Training (OJT) privilege within their UK Part 145 approved exposition, Section 3.15 (145.A.70a). If not, the organisation should submit an amendment to their exposition to the CAA, which includes the required control procedure for this privilege.

Only organisations holding UK Part 145 approval are eligible for the privilege to carry out OJT for UK Part 66 Aircraft Maintenance Licences (AMLs).

OJT for the issue of a UK Part 66 AMLs can be carried out on any civil aircraft type for which the CAA has issued or adopted a Type Certificate (TC), or is in the process of issuing a TC. However, the OJT shall be carried out by an organisation holding a UK Part 145 approval, using the OJT procedures in the approved exposition.

How much does it cost?

There is currently no charge payable to add the privilege to carry out OJT under a Part 145 approval. 

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.

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

If the application team receive your application and all elements are present are correct, an email will be sent to your organisation within 20 working days.

How long is it valid for?

Once granted, a UK Part 145 OJT approval is valid indefinitely (unless limited, suspended, or revoked). If an organisation wishes to add additional types, they must submit the new OJT logbook to their allocated Surveyor for acceptance. 

OJT will be subject to audit by the CAA Surveyor as part of the planned oversight programme of the Part 145 approval. 

What do I need to send with my application?

  • a revision to the UK Part 145 exposition, which includes the OJT procedures (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 Part-21 aircraft Type Certificate Data Sheet)
  • an audit conducted by the organisation for the facility concerned
  • a copy of the OJT Logbook for the aircraft type(s).
  • copy of the completed Compliance Report
  • details of the approved assessor (copy of current Part 145 Authorisation).
Close What do I need to send with my application?

How do I apply?


  • submit a copy of the draft exposition amendment along with the supporting documents to apply@caa.co.uk.
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What happens next?

  • once the application is received and the fee processed, the application will be allocated to a surveyor for them to complete a desktop audit/review. The Surveyor will determine if an on-site audit is required.
  • once all the audits are completed and findings closed, then the approval will be granted through approval of the exposition. 
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