{"id":172252,"date":"2025-03-03T07:08:24","date_gmt":"2025-03-03T00:08:24","guid":{"rendered":"https:\/\/www.caat.or.th\/?page_id=172252"},"modified":"2026-03-09T14:31:24","modified_gmt":"2026-03-09T07:31:24","slug":"mods-and-repairs-approval-certificate","status":"publish","type":"page","link":"https:\/\/www.caat.or.th\/en\/certificates-licenses\/aircraft\/guidance-material\/mods-and-repairs-approval-certificate\/","title":{"rendered":"Mods and Repairs Approval Certificate"},"content":{"rendered":"\n<h2 class=\"wp-block-heading has-text-align-center is-style-caat-heading-underline\">Mods and Repairs Approval Certificate<\/h2>\n\n\n\n<h2 class=\"wp-block-heading\">Modifications and Repairs Approval Certificate<\/h2>\n\n\n\n<h2 class=\"wp-block-heading is-style-caat-heading-underline\">Introduction<\/h2>\n\n\n\n<p>A Modifications and&nbsp;Repairs Approval Certificate serves as evidence to demonstrate that the changes to the type design of an aircraft, engine,&nbsp;or propeller under Modifications or Repairs are in compliance with the applicable airworthiness standards in CAAT Requirement No. 96, and environmental protection standards in CAAT Requirement No. 97.<\/p>\n\n\n\n<h2 class=\"wp-block-heading is-style-caat-heading-underline\">Reference Regulations<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li><a href=\"https:\/\/www.caat.or.th\/laws-regulations\/133076\/\" title=\"\"><span style=\"text-decoration: underline\">CAAT Requirement No. 20 on Rules and Procedure for Approval of Modifications and Repairs to Type Certificate Product B.E. 2562<\/span><\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/www.caat.or.th\/laws-regulations\/164461\/\" title=\"\"><span style=\"text-decoration: underline\">CAAT Requirement No. 96 on Airworthiness Standards<\/span><\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/www.caat.or.th\/laws-regulations\/164453\/\" title=\"\"><span style=\"text-decoration: underline\">CAAT Requirement No. 97 on Aircraft Environmental Protection Standards (TCAR AIR Part \u2013 34)<\/span><\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/www.caat.or.th\/laws-regulations\/164447\/\" title=\"\"><span style=\"text-decoration: underline\">CAAT Requirement No. 98 on Aircraft Noise Certificates<\/span><\/a><\/li>\n\n\n\n<li><span style=\"text-decoration: underline\"><a href=\"https:\/\/www.caat.or.th\/laws-regulations\/170448\/\" title=\"\">Notification of The Civil Aviation Authority of Thailand on Consideration for Approval of Modifications and Repairs B.E. 2568<\/a><\/span><\/li>\n<\/ul>\n\n\n\n<p><strong>Application and required documents<\/strong><\/p>\n\n\n\n<p>There are three phases associated with the Modifications and Repairs Approval Certificate:<\/p>\n\n\n\n<p><strong>Phase 1: Acceptance<\/strong>&nbsp;\u2013 The applicant applies for an acceptance of modification or repair data in the form of an acceptance letter, which authorises the modification or repair on the aircraft. The following documents must be submitted:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Intention Letter<\/li>\n\n\n\n<li>Completed&nbsp;<a href=\"https:\/\/www.caat.or.th\/laws-regulations\/133076\/\" title=\"\"><span style=\"text-decoration: underline\">Modifications and Repairs Approval Application Form<\/span><\/a>&nbsp;(signed by owner or possessor of the aircraft)<\/li>\n\n\n\n<li>Completed&nbsp;<a href=\"https:\/\/www.caat.or.th\/laws-regulations\/133076\/\" title=\"\"><span style=\"text-decoration: underline\">Modifications and Repairs Approval Application Report<\/span><\/a>&nbsp;(signed by owner or possessor)<\/li>\n\n\n\n<li>Modification&nbsp;or repair&nbsp;instructions acceptable in accordance with CAAT Requirement No. 20<\/li>\n\n\n\n<li>Supporting documents associated with the Modifications or Repairs<\/li>\n<\/ul>\n\n\n\n<p><strong>Phase 2: Conformity Inspection<\/strong>&nbsp;\u2013 The operator performs the modification or repair&nbsp;in accordance with the accepted data. CAAT may inspect the modification or repair&nbsp;of the aircraft. In case any findings identified during the inspection, the applicant&nbsp;must submit an evidence of corrective actions to CAAT.<\/p>\n\n\n\n<p><strong>Phase 3: Approval<\/strong>&nbsp;\u2013 The applicant submits the modification or repair&nbsp;result to CAAT to obtain the Modifications and Repairs Approval Certificate including:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Intention Letter<\/li>\n\n\n\n<li>Copy of completed worksheets<\/li>\n\n\n\n<li>Airworthiness Approval Tags or Certificates of Conformity<\/li>\n\n\n\n<li>Copy of Aircraft Logbook with reference to the mod or repair data<\/li>\n\n\n\n<li>Certificate of Release to Service (CRS)<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading is-style-caat-heading-underline\">Procedure<\/h2>\n\n\n\n<p><strong>Phase 1 Acceptance<\/strong><\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>Application Submission<\/strong>\n<ul class=\"wp-block-list\">\n<li>The applicant submits a modification&nbsp;or repair&nbsp;acceptance package to CAAT for initial review and acceptance of the package.<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong>Acceptance Application Review<\/strong>\n<ul class=\"wp-block-list\">\n<li>An assigned staff reviews the submitted application package to ensure compliance with CAAT Requirement No. 20 on Rules and Procedure for Approval of Modifications and Repairs to Type Certificate Product B.E. 2562.<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong>Preparation of Acceptance Package<\/strong>\n<ul class=\"wp-block-list\">\n<li>The staff prepares and submits a package for a Letter of Acceptance to DG for approval.<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong>Approval for Letter of Acceptance<\/strong>\n<ul class=\"wp-block-list\">\n<li>The Letter of Acceptance is approved by DG.<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong>Applicant notification<\/strong>\n<ul class=\"wp-block-list\">\n<li>The applicant is notified by the staff to obtain the Modification or Repair Acceptance letter.<\/li>\n<\/ul>\n<\/li>\n<\/ol>\n\n\n\n<p><strong>Phase 2 \u2013 Conformity Inspection<\/strong><\/p>\n\n\n\n<p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp;The assigned staff makes an appointment with the applicant for the aircraft modification&nbsp;or repair&nbsp;inspection to ensure if the modification or repair is performed in accordance with the accepted instructions and meets all applicable CAAT continuing airworthiness requirements. Any findings identified during the inspection must be corrected before moving to the next phase.<\/p>\n\n\n\n<p><strong>Phase 3 \u2013 Approval<\/strong><\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>Application Submission<\/strong>\n<ul class=\"wp-block-list\">\n<li>The applicant submits the modification&nbsp;or repair&nbsp;approval package for initial review and acceptance of the package.<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong>Approval Application Review<\/strong>\n<ul class=\"wp-block-list\">\n<li>An assigned staff verifies that the submitted application package complies with CAAT Requirement No. 20 on Rules and Procedure for Approval of Modifications and Repairs to Type Certificate Product B.E. 2562.<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong>Preparation of Approval Package<\/strong>\n<ul class=\"wp-block-list\">\n<li>The staff prepares and submits the approval package to DG for approval.<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong>Approval Process<\/strong>\n<ul class=\"wp-block-list\">\n<li>DG reviews the package for approval certificate.<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong>Applicant notification<\/strong>\n<ul class=\"wp-block-list\">\n<li>The applicant is notified by the staff to obtain the Modifications and&nbsp;Repair Acceptance Letter.<\/li>\n<\/ul>\n<\/li>\n<\/ol>\n\n\n\n<p><em><strong>Remark:<\/strong>&nbsp;The issuance of the Mods and&nbsp;Repairs Approval Certificate will be cancelled if additional documents found to be missing or incorrect within 30 days after CAAT request.<\/em><\/p>\n\n\n\n<h2 class=\"wp-block-heading is-style-caat-heading-underline\">Approval Duration<\/h2>\n\n\n\n<p>Issuance of the Mods and&nbsp;Repairs Approval Certificate must be completed within 36 working days.<\/p>\n\n\n\n<p><em><strong>Remark:<\/strong>&nbsp;Validation duration does not include applicant\u2019s document correction period.<\/em><\/p>\n\n\n\n<h2 class=\"wp-block-heading is-style-caat-heading-underline\">Modifications and&nbsp;Repairs Approval Certificate Fee<\/h2>\n\n\n\n<p>There is no fee associated with the issuance of the Modifications and&nbsp;Repairs Approval Certificate.<\/p>\n\n\n\n<h2 class=\"wp-block-heading is-style-caat-heading-underline\">Eligibility<\/h2>\n\n\n\n<p>An owner or possessor of a Thai registered aircraft is eligible to apply for a Modifications or Repairs Approval Certificate.<\/p>\n\n\n\n<h2 class=\"wp-block-heading is-style-caat-heading-underline\">Service Place\/ Channel<\/h2>\n\n\n\n<ol class=\"wp-block-list\">\n<li>Airworthiness and Aircraft Engineering Department\n<ul class=\"wp-block-list\">\n<li>The Civil Aviation Authority of Thailand<br>222 Soi Vibhavadi Rangsit 28,&nbsp;Chatuchak, Chatuchak, Bangkok 10900<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li>EMPIC&nbsp;<a href=\"http:\/\/service.caat.or.th\/\"><u>http:\/\/service.caat.or.th<\/u><\/a><\/li>\n<\/ol>\n","protected":false},"excerpt":{"rendered":"<p>Mods and Repairs Approval Certificate Modifications and Repairs Approval Certificate Introduction A Modifications and&nbsp;Repairs Approval Certificate serves as evidence to demonstrate that the changes to the type design of an aircraft, engine,&nbsp;or propeller under Modifications or Repairs are in compliance with the applicable airworthiness standards in CAAT Requirement No. 96, and environmental protection standards in CAAT Requirement No. 97. Reference Regulations Application and required documents There are three phases associated with the Modifications and Repairs Approval Certificate: Phase 1: Acceptance&nbsp;\u2013 The applicant applies for an acceptance of modification or repair data in the form of an acceptance letter, which authorises the modification or repair on the aircraft. The following documents must be submitted: Phase 2: Conformity Inspection&nbsp;\u2013 The operator performs the modification or repair&nbsp;in accordance with the accepted data. CAAT may inspect the modification or repair&nbsp;of the aircraft. In case any findings identified during the inspection, the applicant&nbsp;must submit an evidence of corrective actions to CAAT. Phase 3: Approval&nbsp;\u2013 The applicant submits the modification or repair&nbsp;result to CAAT to obtain the Modifications and Repairs Approval Certificate including: Procedure Phase 1 Acceptance Phase 2 \u2013 Conformity Inspection &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;The assigned staff makes an appointment with the applicant for<\/p>\n","protected":false},"author":258,"featured_media":0,"parent":171597,"menu_order":2,"comment_status":"open","ping_status":"open","template":"","meta":{"slim_seo":{"title":"Mods and Repairs Approval Certificate - The Civil Aviation Authority of Thailand (CAAT) | \u0e2a\u0e33\u0e19\u0e31\u0e01\u0e07\u0e32\u0e19\u0e01\u0e32\u0e23\u0e1a\u0e34\u0e19\u0e1e\u0e25\u0e40\u0e23\u0e37\u0e2d\u0e19\u0e41\u0e2b\u0e48\u0e07\u0e1b\u0e23\u0e30\u0e40\u0e17\u0e28\u0e44\u0e17\u0e22","description":"Mods and Repairs Approval Certificate Modifications and Repairs Approval Certificate Introduction A Modifications and&nbsp;Repairs Approval Certificate serves a"},"footnotes":""},"class_list":["post-172252","page","type-page","status-publish","hentry"],"meta_box":{"landing_page_settings_layout_radio":"","landing_page_settings_background":false,"landing_page_settings_main_image":false,"landing_page_settings_text_image":false,"landing_page_settings_button_1":false,"landing_page_settings_button_1_link":"","landing_page_settings_button_2":false,"landing_page_settings_button_2_link":""},"_links":{"self":[{"href":"https:\/\/www.caat.or.th\/en\/wp-json\/wp\/v2\/pages\/172252","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.caat.or.th\/en\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/www.caat.or.th\/en\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/www.caat.or.th\/en\/wp-json\/wp\/v2\/users\/258"}],"replies":[{"embeddable":true,"href":"https:\/\/www.caat.or.th\/en\/wp-json\/wp\/v2\/comments?post=172252"}],"version-history":[{"count":2,"href":"https:\/\/www.caat.or.th\/en\/wp-json\/wp\/v2\/pages\/172252\/revisions"}],"predecessor-version":[{"id":199377,"href":"https:\/\/www.caat.or.th\/en\/wp-json\/wp\/v2\/pages\/172252\/revisions\/199377"}],"up":[{"embeddable":true,"href":"https:\/\/www.caat.or.th\/en\/wp-json\/wp\/v2\/pages\/171597"}],"wp:attachment":[{"href":"https:\/\/www.caat.or.th\/en\/wp-json\/wp\/v2\/media?parent=172252"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}