Maintenance, Repair and Overhaul Approval

AMOs based outside Singapore from partner territories may maintain Singapore-registered aircraft under a bilateral arrangement, such as a Technical Arrangement for Maintenance (TA-M). 

Likewise, Singapore-based AMOs may maintain foreign-registered aeronautical products under TA-Ms with bilateral partners. 

1. Have your Quality Manager (or equivalent) meet with us to learn more about the process before applying. You may contact us using our Enquiries & Feedback Form.

2. Fill in and submit Form CAAS(AW)114 with details about your: 

   • organisation

   • key staff

   • intent to apply for SAR-145. 

The application should be made via the online application eSOMS instead of the (AW)114 form. However, the form should be kept as a contingency in case of prolonged system downtime. Please help to amend accordingly. 

Note: CAAS will assign an officer to guide you through the application process.

3. Fill in and submit your application on eSOMS together with the required documents listed in AC 145-20 and fees. The required documents are:

   • letter of application addressed to CAAS' Director of Flight Standards Division

   • letter of intent (from a foreign NAA, Singapore AOC or SAR-145 AMO)

   • SAR-145 approval application (use Form CAAS(AW)21 if eSOMS is not available)

   • personnel resume of accountable manager, quality assurance manager, key personnel and certifying staff (use Form CAAS(AW)22 if eSOMS is not available)

   • application for acceptance of certifying staff (use Form CAAS(AW)102 if eSOMS is not available)

   • proposed Maintenance Organisation Exposition (MOE) and Capability List (if separate from the Maintenance Organisation Exposition)

   • Form CAAS(AW)155 - CAAS MOE and Supplement cross reference against SAR-145 requirements checklist

   • a copy of Form CAAS(AW) 95 - Authorised Release Certificate (may be illustrated in the Maintenance Organisation Exposition)

   • company’s facility lease agreement

   • company’s registration (for Singapore company, please provide ACRA or its equivalent).

   • company’s Safety Management System (SMS) manual. Refer to Advisory Circular AC 1-3 and AC 145-11 for detailed information on SMS for SAR-145 AMOs. For overseas applicants, please provide the SMS framework that is accepted by foreign NAAs

   • Personnel training programme

   • A schedule of events and certification timeline

Refer to AC 145-20 Application requirements for SAR-145 approval for more information on the required documents.

Note: The application process starts when CAAS receives the complete set of documents and fee payment. 

6. CAAS reviews your documents to ensure that your processes and procedures comply with SAR-145. 
   
   During this phase, CAAS may request clarifications and amendments to your documents.

7. CAAS audits your facilities to verify that your operations follow your documented processes and procedures. 

8. You will be SAR-145 AMO certified once CAAS has verified that you comply with all of the requirements under SAR-145. 
   
   After certification, CAAS conducts regular inspections to ensure certificate holders continue to meet safety and regulatory standards.