Application for Singapore Technical Standard Order (STSO) Certificate of Approval
The Technical Standard Order is the minimum performance standard required for articles (such as life vest, seats, loud hailers, etc) used on civil aircraft. CAAS may grant a Singapore Technical Standard Order (STSO) Certificate of Approval for articles that meet the applicable airworthiness design standards.
CAAS has agreements with foreign civil aviation authorities that allows for validation of foreign Technical Standard Orders. You may find the list of agreements at this page. For more information on the requirements, please refer to Singapore Airworthiness Requirements Part 21 (PDF, 286 KB), Subpart E.
Note: All costs incurred for the application evaluation will be recovered from you. The application fees are prescribed in the Singapore Airworthiness Requirements Part 21 (PDF, 286 KB) and Twelfth Schedule of the Singapore Air Navigation Order (PDF, 1 MB).
To apply, please contact us. An officer will be assigned to guide you through the application process.
You may access the application form for the Singapore Technical Standard Order Certificate of Approval - CAAS(AW)205 here.
Please click here (PDF, 709 KB) to download list of STSO issued. This list is updated on a monthly basis.