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Civil Aviation Authority of Singapore

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.

Last updated 14 May 2026

What is a Letter of Acceptance of Type Certificate (LOATC)

Before an aircraft can be registered in Singapore and issued with a Certificate of Airworthiness, CAAS must first review and accept the aircraft's design, including its associated engines or propellers.

Design acceptance is achieved through an application to CAAS for the LOATC for the aircraft and its associated engines or propellers.

The LOATC is required only for the first entry of that aircraft, engine or propeller type on the Singapore aircraft register.

CAAS does not issue Type Certificates as it is not a State of Design.

Mutual recognition

CAAS has established bilateral agreements with other Civil Aviation Authorities on the processing of LOATC.

Application process

Who can apply  

The holder of the Type Certificate issued for the aircraft, engines or propellers can apply. 

How to qualify 

The aircraft must have a valid Type Certificate issued by the aviation authority of the State that certified the aircraft design (Certifying Authority), and comply with the applicable airworthiness design standards specified in the Singapore Airworthiness Requirements Part 21 (SAR-21).

Further information on the requirements may be found in Subpart A of the SAR-21.

When to apply 

Applications should be made once it is confirmed that an aircraft type will be registered in Singapore for the first time and operated by a Singapore operator.

You are encouraged to engage CAAS early to facilitate planning and ensure sufficient time for the review and acceptance process.

What are the fees  

The fees payable are stated in: 

What is the processing time  

Processing timelines vary by application type and are set out in IC 6/2025 Information circular on service standards for processing of aviation safety instruments related to airworthiness, flight operations and training organisations.

You are encouraged to engage CAAS early to discuss your LOAC application to facilitate timely processing.

How to apply 

For details and guidance on how to apply, refer to AC 21-6 Guidance on the application of a CAAS Letter of Acceptance of Type Certificate. 

Phase 1: Pre-application

  1. Notify CAAS of your intention to apply for a LOATC. 

  2. Meet with CAAS, if needed, to better understand the process. 

Phase 2: Formal application

  1. Submit your application on eSOMS. The required documents are listed in SAR-21 Acceptable Means of Compliance 21.110 and AC 21-6 Guidance on the application of a CAAS Letter of Acceptance of Type Certificate, which includes:

    • a letter of intent from a Singapore air operator

    • information on the aircraft and its associated engine or propeller

    • information on the relevant Certifying Authority

    • details of the applicable certification basis

Phase 3: Document evaluation

  1. CAAS reviews your application and documents to ensure compliance to the requirements. 

    During this phase, CAAS may request clarifications on the submitted documents. 

Phase 4: Demonstration and inspection

  1. Typically, a technical familiarisation exercise is conducted at your facility where you and CAAS go through the following in detail:

    • system design and architecture  

    • certification basis 

    • means of compliance 

Phase 5: Certification

  1. CAAS will send you an invoice for all fees associated with processing your application.

    CAAS will issue the LOATC after confirming compliance with all requirements and receiving payment.

Application for LOATC

To apply, submit your application on eSOMS

Apply on eSOMS

If eSOMS is unavailable, download the application form and contact us. A CAAS officer will guide you through the manual application process.

What is the validity period 

The LOATC remains valid until revoked by CAAS.

If there are significant changes to the aircraft, engine or propeller design, which will be incorporated on the aircraft that is to be registered in Singapore and issued with the Certificate of Airworthiness, contact CAAS to update the LOATC.

Type Certificates accepted by CAAS  

For the list of TCs that have been accepted, download the List of Type Certificates.

Legislation, regulations and resources 

Contact information 

Flight Standards Division
Contact us using the Enquiries & Feedback Form