AMOC to an AD

AMOC to an AD

Application for Alternative Method of Compliance (AMOC) to an (Airworthiness Directive (AD)

Introduction

An Alternative Method of Compliance (AMOC) is an alternative means, other than the one specified in an Airworthiness Directive (AD), to address an unsafe condition on products, parts, or appliances. An AMOC must provide a level of safety equivalent to that restored by compliance with the original AD. AMOCs may be issued for, but are not necessarily limited to, the following:

• Alternative modifications
• Alternative inspection procedures
• Alternative maintenance intervals or procedures
• Specific operating procedures or limitations
• An extension of compliance time 

Any person intending to demonstrate compliance with an AD using an AMOC, instead of the method specified in the AD, must submit the proposed AMOC to the Director General of the Civil Aviation Authority of Thailand for review and approval prior to implementation.

Reference Regulations

• CAAT Requirement No.89 on Rules and Procedures for Airworthiness Directives (TCAR AIR Part – 39)

Application and required documents

• Intention Letter
• Completed application for Alternate Methods of Compliance to an AD Form
• For CAAT AD;
  • Substantiating data to demonstrate the equivalent level of safety to the AD, approved by the design holder of the aircraft, component, or modifications or repairs, as applicable and
  • Any additional information requested by CAAT.
• For foreign AD;   
  • In case the AMOC involves other alternative methods, evidence that the AMOC is approved by the issuing State of the foreign AD applicable to the aircraft, component, or modifications or repairs; or
  • In case the AMOC involves only an extension of compliance time, the applicant shall submit: 
  1. evidence that the AMOC is approved by the issuing State of the foreign AD applicable to the aircraft, component, or modifications or repairs; or
  2. an acceptable justification, including:
     • substantiating data issued from the applicable design holder which demonstrates equivalent level of safety to the AD; and
     • evidence that this extension is not in conflict with the applicable requirements of the State of Design; and
     • an appropriate reason from the applicant, justifying why the extension is required.

Procedure

1. Application Submission
   The applicant submits the application along with supporting documents to CAAT.
2. Application Review
   The application package will be reviewed by the assigned staff to ensure compliance with all applicable regulations.
3. Preparation of Package
   The certificate package will be prepared and submitted to DG for approval.
4. Approval Process
   The approval letter is sign upon satisfactory evidence of compliance with applicable regulations.
5. Inform Approval
   The applicant is informed of the approval and receives the AMOC Approval Letter.  

AMOC Approval Letter Fee

Issuance the AMOC Approval Letter is free.

Service Place/ Channel

1. Airworthiness and Aircraft Engineering Department
   • The Civil Aviation Authority of Thailand
     222 Soi Vibhavadi Rangsit 28, Chatuchak, Chatuchak, Bangkok 10900
2. EMPIC http://service.caat.or.th