Aircraft maintenance (personnel)
Learn about the requirements and application process to become a licensed aircraft maintenance personnel.
Last updated 3 September 2026
An Aircraft Maintenance (Personnel) Licence (AML) from CAAS is required to perform any of the following on a Singapore-registered aircraft of a particular aircraft type:
perform or supervise maintenance work
certify maintenance work
Before issuing a Maintenance Certification, you must hold a valid AML with an appropriate aircraft type rating, and must be authorised by a Singapore Airworthiness Requirements Part 145 Aircraft Maintenance Organisation (SAR-145 AMO).
Note: An individual who wishes to pursue a CAAS SAR-66 AML can enrol in a CAAS approved Maintenance Training Organisation (opens in new tab).
Who can apply
To apply for, or convert your foreign AML, you must be:
at least 21 years old
working for, or preparing to commence employment with, a SAR‑145 Approved Maintenance Organisation
Application process
How to qualify
You must meet the requirements under Singapore Airworthiness Requirements Part 66 (SAR-66) Aircraft Maintenance Licensing (opens in new tab).
For instance, you must:
pass the relevant exams
have the required experience as summarised in the table below:
Your status | Experience requirement |
Did not undergo SAR-147 training | The experience you need depends on the AML category you are applying for. You must have the required period of experience stated in SAR-66 (SAR 66.30) (opens in new tab). |
Completed a SAR-147 training programme | You can qualify with a shorter experience period depending on the AML category you are applying for as stated in SAR-66 (SAR 66.30) (opens in new tab). |
Holder of a valid foreign AML | You must have the required certifying experience and meet other conditions. For details, refer to SAR-66 and AC 66-10 Advisory circular on the conversion of foreign aircraft maintenance licence (opens in new tab). |
What is the processing time
Complete applications take about 10 working days to process. Incomplete applications will be returned.
What fees are payable
The fees payable are stated in the Singapore Air Navigation Order (ANO) Twelfth Schedule (opens in new tab).
They include:
fees for the examinations
AML application/renewal fees
fees for adding aircraft type ratings to your AML
How to book examinations
To book examinations, you must:
Obtain a CAPELS Personal Identification Number (PID) by registering for a CAPELS account (opens in new tab).
Register for the required exams using your PID and pay the fees on the CAAS Examination Portal (opens in new tab).
How to apply for AML
Register for an account on the Civil Aviation Personnel Licensing System (CAPELS) (opens in new tab).
Submit your application together with the fees on CAPELS.
Application for AML
How to add an aircraft type rating
To add an aircraft type rating to your category of AML, submit an application with the applicable fees on CAPELS (opens in new tab).
For details, refer to AC 66-5 Advisory circular on aircraft types acceptable for endorsement on SAR-66 Aircraft Maintenance Licence (opens in new tab).
CAAS may impose limitations on your aircraft type ratings in your CAAS AML. For details, refer to AC 66-4 Advisory circular on limitations that may be imposed on the Aircraft Maintenance Licence (opens in new tab).
Application to add aircraft type rating
How to add a new AML category
To add a new AML category, you must
pass the relevant exams
have the required experience for the new category
For the exams and experience required, refer to:
Appendix 1 of SAR-66 (opens in new tab)
Appendix 4 of SAR-66 (opens in new tab)
Application to add a new AML category
What is the validity period
AMLs are valid for up to 2 years unless suspended or revoked.
To renew your AML, submit your renewal at least 3 months before expiry on CAPELS.
To reactivate a lapsed or expired AML, refer to AC 66-11 Advisory Circular on Reissuance of an Aircraft Maintenance Licence (opens in new tab).
Maintenance Training Organisation
The list of approved Maintenance Training Organisation (opens in new tab) may be downloaded.
Legislation, regulations and resources
AC 66-11 Reissuance of an Aircraft Maintenance Licence (opens in new tab)
AC 66-2 Guide to Compilation of Schedule of Experience and On-the-Job Training (opens in new tab)
AC 66-6 Suggested Study References for SAR-66 Basic Knowledge Examinations (opens in new tab)
Contact information
Flight Standards Division (Personnel Licensing) (opens in new tab)