{"id":54792,"date":"2026-08-21T17:43:37","date_gmt":"2026-08-21T15:43:37","guid":{"rendered":"https:\/\/www.caa.gov.cz\/?post_type=ufaq&#038;p=54792"},"modified":"2026-08-21T17:43:38","modified_gmt":"2026-08-21T15:43:38","slug":"what-is-the-difference-between-aml-part-66-categories-a-b1-b2-b2l-b3-l-and-c","status":"publish","type":"ufaq","link":"https:\/\/www.caa.gov.cz\/en\/ufaqs\/what-is-the-difference-between-aml-part-66-categories-a-b1-b2-b2l-b3-l-and-c\/","title":{"rendered":"What is the difference between AML Part-66 categories A, B1, B2, B2L, B3, L and C?"},"content":{"rendered":"<style>.ewd-ufaq-post-margin-symbol span {\r\nfont-family:ewd-toggle-icon;!important;\r\n} \r\n\r\n.ewd-ufaq-post-margin-symbol span {\r\n    font-size: 15px !important;\r\n    \r\n}\r\n\r\n.ewd-ufaq-post-margin-symbol {\r\ncolor:#f0a !important;\r\nbackground-color: #ff00000 !important;\r\n}\r\n\r\n.ewd-ufaq-post-margin-symbol span {\r\ntop:5px !important;\r\nleft:10px !important;\r\nposition:relative !important;\r\n}\r\n\r\n.ufaq-faq-category-title h4 {\r\nfont-size:25px;\r\n}\r\n\r\n.ufaq-faq-title-text h3 {\r\nfont-size:20px;\r\n}<\/style><div  class=\"ewd-ufaq-faq-list ewd-ufaq-page-type-load_more ewd-ufaq-category-tabs-\" id='ewd-ufaq-faq-list'>\n\n\t<input type='hidden' name='show_on_load' value='' id='ewd-ufaq-show-on-load' \/>\n<input type='hidden' name='include_category' value='' id='ewd-ufaq-include-category' \/>\n<input type='hidden' name='exclude_category' value='' id='ewd-ufaq-exclude-category' \/>\n<input type='hidden' name='orderby' value='date' id='ewd-ufaq-orderby' \/>\n<input type='hidden' name='order' value='asc' id='ewd-ufaq-order' \/>\n<input type='hidden' name='post_count' value='-1' id='ewd-ufaq-post-count' \/>\n<input type='hidden' name='current_url' value='\/en\/wp-json\/wp\/v2\/ufaq\/54792' id='ewd-ufaq-current-url' \/>\n\t\n\t\n\t<div class='ewd-ufaq-faqs'>\n\n\t\t<div  class=\"ewd-ufaq-faq-div ewd-ufaq-faq-column-count-one ewd-ufaq-faq-responsive-columns- ewd-ufaq-faq-display-style-default ewd-ufaq-can-be-toggled\" id='ewd-ufaq-post-54792-DRZ7ja4QWE' data-post_id='54792'>\n\n\t\t\n\t<div class='ewd-ufaq-faq-title ewd-ufaq-faq-toggle'>\n\t\n\t<a class='ewd-ufaq-post-margin'  href='#' role=\"button\">\n\n\t\t<div class='ewd-ufaq-post-margin-symbol ewd-ufaq-square'>\n\t\t\t<span >A<\/span>\n\t\t<\/div>\n\n\t\t<div class='ewd-ufaq-faq-title-text'>\n\n\t\t\t<h4>\n\t\t\t\tWhat is the difference between AML Part-66 categories A, B1, B2, B2L, B3, L and C?\t\t\t<\/h4>\n\n\t\t<\/div>\n\n\t\t<div class='ewd-ufaq-clear'><\/div>\n\n\t<\/a>\n\t\n<\/div>\n\t\n\t<div class='ewd-ufaq-faq-body' >\n\n\t\t\n\t\t\t\n\t\t\n\t\t\t<div class='ewd-ufaq-post-margin ewd-ufaq-faq-post'>\n\t\n<p class=\"wp-block-paragraph\">The AML Part-66 categories define the scope of certification privileges for aircraft maintenance:<\/p>\n\n\n\n<ol style=\"list-style-type:lower-alpha\" class=\"wp-block-list\">\n<li><strong>Category A<\/strong> \u2013 minor scheduled line maintenance and simple defect rectification.<\/li>\n\n\n\n<li><strong>Category B1<\/strong> \u2013 maintenance of aircraft structure, powerplant, mechanical and electrical systems, including simple tasks on avionic systems.<\/li>\n\n\n\n<li><strong>Category B2<\/strong> \u2013 maintenance of avionics and electrical systems, including related electrical and avionics tasks within mechanical systems.<\/li>\n\n\n\n<li><strong>Category B2L<\/strong> \u2013 maintenance of electrical and avionics systems within the limits of the system ratings endorsed on the licence.<\/li>\n\n\n\n<li><strong>Category B3<\/strong> \u2013 maintenance of non-pressurised piston-engine aeroplanes with an MTOM of 2 000 kg or less.<\/li>\n\n\n\n<li><strong>Category L<\/strong> \u2013 maintenance of category L aircraft (e.g. sailplanes, powered sailplanes, balloons and airships) within the privileges of the applicable L subcategory.<\/li>\n\n\n\n<li><strong>Category C<\/strong> \u2013 issuing a CRS for the aircraft as a whole following completion of base maintenance.<\/li>\n<\/ol>\n\n\n\n<p class=\"wp-block-paragraph\">Reference: points 66.A.3 and 66.A.20 of Annex III (Part-66).<\/p>\n<\/div>\n\t\t\n\t\t\t<div class='ewd-ufaq-faq-custom-fields'>\n\n\t\n<\/div>\n\t\t\n\t\t\t\n\t\t\n\t\t\t\n\t\t\n\t\t\t\n\t\t\n\t\t\t\n\t\t\n\t\t\t\n\t\t\n\t\t\t\n\t\t\n\t\t\t\n\t\t\n\t<\/div>\n\n<\/div>\n\t<\/div>\n\n\t\n<\/div>","protected":false},"excerpt":{"rendered":"<p>A What is the difference between AML Part-66 categories A, B1, B2, B2L, B3, L and C? The AML Part-66 categories define the scope of certification privileges for aircraft maintenance: Category A \u2013 minor scheduled line maintenance and simple defect rectification. Category B1 \u2013 maintenance of aircraft structure, powerplant, mechanical and electrical systems, including simple [&hellip;]<\/p>\n","protected":false},"author":24,"featured_media":0,"comment_status":"closed","ping_status":"closed","template":"","ufaq-category":[999],"ufaq-tag":[],"class_list":["post-54792","ufaq","type-ufaq","status-publish","hentry","ufaq-category-aircraft-maintenance-license"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.5 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>What is the difference between AML Part-66 categories A, B1, B2, B2L, B3, L and C? - Civil Aviation Authority of the Czech Republic<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.caa.gov.cz\/ufaqs\/what-is-the-difference-between-aml-part-66-categories-a-b1-b2-b2l-b3-l-and-c\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"What is the difference between AML Part-66 categories A, B1, B2, B2L, B3, L and C? - Civil Aviation Authority of the Czech Republic\" \/>\n<meta property=\"og:description\" content=\"A What is the difference between AML Part-66 categories A, B1, B2, B2L, B3, L and C? The AML Part-66 categories define the scope of certification privileges for aircraft maintenance: Category A \u2013 minor scheduled line maintenance and simple defect rectification. Category B1 \u2013 maintenance of aircraft structure, powerplant, mechanical and electrical systems, including simple [&hellip;]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.caa.gov.cz\/ufaqs\/what-is-the-difference-between-aml-part-66-categories-a-b1-b2-b2l-b3-l-and-c\/\" \/>\n<meta property=\"og:site_name\" content=\"Civil Aviation Authority of the Czech Republic\" \/>\n<meta property=\"article:modified_time\" content=\"2026-08-21T15:43:38+00:00\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data1\" content=\"1 minute\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/www.caa.gov.cz\\\/ufaqs\\\/what-is-the-difference-between-aml-part-66-categories-a-b1-b2-b2l-b3-l-and-c\\\/\",\"url\":\"https:\\\/\\\/www.caa.gov.cz\\\/ufaqs\\\/what-is-the-difference-between-aml-part-66-categories-a-b1-b2-b2l-b3-l-and-c\\\/\",\"name\":\"What is the difference between AML Part-66 categories A, B1, B2, B2L, B3, L and C? - Civil Aviation Authority of the Czech Republic\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/www.caa.gov.cz\\\/#website\"},\"datePublished\":\"2026-08-21T15:43:37+00:00\",\"dateModified\":\"2026-08-21T15:43:38+00:00\",\"breadcrumb\":{\"@id\":\"https:\\\/\\\/www.caa.gov.cz\\\/ufaqs\\\/what-is-the-difference-between-aml-part-66-categories-a-b1-b2-b2l-b3-l-and-c\\\/#breadcrumb\"},\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\\\/\\\/www.caa.gov.cz\\\/ufaqs\\\/what-is-the-difference-between-aml-part-66-categories-a-b1-b2-b2l-b3-l-and-c\\\/\"]}]},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\\\/\\\/www.caa.gov.cz\\\/ufaqs\\\/what-is-the-difference-between-aml-part-66-categories-a-b1-b2-b2l-b3-l-and-c\\\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Dom\u016f\",\"item\":\"https:\\\/\\\/www.caa.gov.cz\\\/en\\\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"FAQs\",\"item\":\"https:\\\/\\\/www.caa.gov.cz\\\/en\\\/ufaqs\\\/\"},{\"@type\":\"ListItem\",\"position\":3,\"name\":\"What is the difference between AML Part-66 categories A, B1, B2, B2L, B3, L and C?\"}]},{\"@type\":\"WebSite\",\"@id\":\"https:\\\/\\\/www.caa.gov.cz\\\/#website\",\"url\":\"https:\\\/\\\/www.caa.gov.cz\\\/\",\"name\":\"Civil Aviation Authority of the Czech Republic\",\"description\":\"\",\"potentialAction\":[{\"@type\":\"SearchAction\",\"target\":{\"@type\":\"EntryPoint\",\"urlTemplate\":\"https:\\\/\\\/www.caa.gov.cz\\\/?s={search_term_string}\"},\"query-input\":{\"@type\":\"PropertyValueSpecification\",\"valueRequired\":true,\"valueName\":\"search_term_string\"}}],\"inLanguage\":\"en-US\"}]}<\/script>\n<!-- \/ Yoast SEO plugin. -->","yoast_head_json":{"title":"What is the difference between AML Part-66 categories A, B1, B2, B2L, B3, L and C? - Civil Aviation Authority of the Czech Republic","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/www.caa.gov.cz\/ufaqs\/what-is-the-difference-between-aml-part-66-categories-a-b1-b2-b2l-b3-l-and-c\/","og_locale":"en_US","og_type":"article","og_title":"What is the difference between AML Part-66 categories A, B1, B2, B2L, B3, L and C? - Civil Aviation Authority of the Czech Republic","og_description":"A What is the difference between AML Part-66 categories A, B1, B2, B2L, B3, L and C? The AML Part-66 categories define the scope of certification privileges for aircraft maintenance: Category A \u2013 minor scheduled line maintenance and simple defect rectification. Category B1 \u2013 maintenance of aircraft structure, powerplant, mechanical and electrical systems, including simple [&hellip;]","og_url":"https:\/\/www.caa.gov.cz\/ufaqs\/what-is-the-difference-between-aml-part-66-categories-a-b1-b2-b2l-b3-l-and-c\/","og_site_name":"Civil Aviation Authority of the Czech Republic","article_modified_time":"2026-08-21T15:43:38+00:00","twitter_card":"summary_large_image","twitter_misc":{"Est. reading time":"1 minute"},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"WebPage","@id":"https:\/\/www.caa.gov.cz\/ufaqs\/what-is-the-difference-between-aml-part-66-categories-a-b1-b2-b2l-b3-l-and-c\/","url":"https:\/\/www.caa.gov.cz\/ufaqs\/what-is-the-difference-between-aml-part-66-categories-a-b1-b2-b2l-b3-l-and-c\/","name":"What is the difference between AML Part-66 categories A, B1, B2, B2L, B3, L and C? - Civil Aviation Authority of the Czech Republic","isPartOf":{"@id":"https:\/\/www.caa.gov.cz\/#website"},"datePublished":"2026-08-21T15:43:37+00:00","dateModified":"2026-08-21T15:43:38+00:00","breadcrumb":{"@id":"https:\/\/www.caa.gov.cz\/ufaqs\/what-is-the-difference-between-aml-part-66-categories-a-b1-b2-b2l-b3-l-and-c\/#breadcrumb"},"inLanguage":"en-US","potentialAction":[{"@type":"ReadAction","target":["https:\/\/www.caa.gov.cz\/ufaqs\/what-is-the-difference-between-aml-part-66-categories-a-b1-b2-b2l-b3-l-and-c\/"]}]},{"@type":"BreadcrumbList","@id":"https:\/\/www.caa.gov.cz\/ufaqs\/what-is-the-difference-between-aml-part-66-categories-a-b1-b2-b2l-b3-l-and-c\/#breadcrumb","itemListElement":[{"@type":"ListItem","position":1,"name":"Dom\u016f","item":"https:\/\/www.caa.gov.cz\/en\/"},{"@type":"ListItem","position":2,"name":"FAQs","item":"https:\/\/www.caa.gov.cz\/en\/ufaqs\/"},{"@type":"ListItem","position":3,"name":"What is the difference between AML Part-66 categories A, B1, B2, B2L, B3, L and C?"}]},{"@type":"WebSite","@id":"https:\/\/www.caa.gov.cz\/#website","url":"https:\/\/www.caa.gov.cz\/","name":"Civil Aviation Authority of the Czech Republic","description":"","potentialAction":[{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https:\/\/www.caa.gov.cz\/?s={search_term_string}"},"query-input":{"@type":"PropertyValueSpecification","valueRequired":true,"valueName":"search_term_string"}}],"inLanguage":"en-US"}]}},"publishpress_future_workflow_manual_trigger":{"enabledWorkflows":[]},"_links":{"self":[{"href":"https:\/\/www.caa.gov.cz\/en\/wp-json\/wp\/v2\/ufaq\/54792","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.caa.gov.cz\/en\/wp-json\/wp\/v2\/ufaq"}],"about":[{"href":"https:\/\/www.caa.gov.cz\/en\/wp-json\/wp\/v2\/types\/ufaq"}],"author":[{"embeddable":true,"href":"https:\/\/www.caa.gov.cz\/en\/wp-json\/wp\/v2\/users\/24"}],"replies":[{"embeddable":true,"href":"https:\/\/www.caa.gov.cz\/en\/wp-json\/wp\/v2\/comments?post=54792"}],"wp:attachment":[{"href":"https:\/\/www.caa.gov.cz\/en\/wp-json\/wp\/v2\/media?parent=54792"}],"wp:term":[{"taxonomy":"ufaq-category","embeddable":true,"href":"https:\/\/www.caa.gov.cz\/en\/wp-json\/wp\/v2\/ufaq-category?post=54792"},{"taxonomy":"ufaq-tag","embeddable":true,"href":"https:\/\/www.caa.gov.cz\/en\/wp-json\/wp\/v2\/ufaq-tag?post=54792"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}