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Civil Aviation Authority of Singapore

Certification of Products and Articles

Learn about the CAAS approvals required for aircraft and article designs activities in Singapore.

Last updated 9 May 2026

An aircraft’s design must be reviewed and accepted by CAAS before it can be registered in Singapore and issued with a Singapore Certificate of Airworthiness.

This establishes the baseline for future certifications of modifications and repairs and strengthens CAAS’s safety oversight of new aircraft designs.

CAAS issues different types of approvals to support aircraft from initial design acceptance through modifications and repairs during their operational life. These include:

  • Letters of Acceptance of Type Certificate (LOATCs)

  • Supplemental Type Certificates (STCs)

  • Repair Design Approvals (RDAs)

  • STSO Certificates of Approval

CAAS also maintains mutual recognition agreements with other civil aviation authorities to improve efficiency and reduce duplication of certification activities.

Letter of Acceptance of Type Certificate for Aircraft Design

Learn about CAAS' Letter of Acceptance of Type Certificate representing CAAS' formal acceptance for aircraft design, including associated engines or propellers.

Supplemental Type Certificate

Learn about the Supplemental Type Certificate required for incorporating major modification to aircraft registered in Singapore.

Singapore Technical Standard Order Certificate of Approval

Learn about the Singapore Technical Standard Order (STSO) Certificate of Approval required for designing articles used in aircraft.

Repair Design Approval

Learn about the Repair Design Approval (RDA) required to design repairs for incorporation on Singapore-registered aircraft, its associated engines, propellers or articles.