{"id":3435,"date":"2025-10-30T20:20:10","date_gmt":"2025-10-30T20:20:10","guid":{"rendered":"https:\/\/aps-eb.de\/?p=3435"},"modified":"2026-02-12T14:05:52","modified_gmt":"2026-02-12T14:05:52","slug":"continental-diesel-neue-faa-ad-zu-zylinderkoepfen-was-bedeutet-das-fuer-eu-betreiber","status":"publish","type":"post","link":"https:\/\/www.aps-eb.de\/en\/continental-diesel-neue-faa-ad-zu-zylinderkoepfen-was-bedeutet-das-fuer-eu-betreiber\/","title":{"rendered":"Continental Diesel: New FAA-AD on cylinder heads \u2013 what does this mean for EU operators?"},"content":{"rendered":"

The FAA has 15 October 2025<\/strong> the AD 2025-20-18<\/strong> for Continental TAE 125-02-125<\/strong> published engines, Effective from 30 October 2025<\/strong>. Key points: one-off coolant analysis<\/em> and, depending on the findings, System flushing<\/em> or Cylinder head replacement<\/em>.
What does this mean specifically for EASA\/EU operators?<\/p>\n\n\n\n

What is technical about?<\/h2>\n\n\n\n
    \n
  • Background:<\/strong> Several reports on Cracks in cylinder heads<\/strong> (TAE 125-02-125) with risk for Coolant leak<\/em> into the combustion chamber \u2192 power drop until engine failure.<\/li>\n\n\n\n
  • Mandatory measure (FAA-AD 2025-20-18):<\/strong> One-off Coolant analysis<\/strong> according to Continental SB CG 125-1030 P1 (Rev. 4). If the limit values are exceeded:\n
      \n
    • Aluminum\/fluoride over limit<\/em> \u2192 Replace cylinder head<\/strong> + Rinse\/refill system.<\/li>\n\n\n\n
    • Other Limits Exaggerated<\/em> \u2192 Rinse cooling circuit<\/strong> + refill.<\/li>\n<\/ul>\n<\/li>\n\n\n\n
    • Installation ban:<\/strong> After the effective date, only \"serviceable\"<\/em> Cylinder heads are installed.<\/li>\n<\/ul>\n\n\n\n

      Source: Federal Register AD 2025-20-18 (Docket FAA-2025-3432), effective 30.10.2025. See \u2018Dates\u2019, \u2018AD Requirements\u2019 and \u2018Installation Prohibition\u2019 in full text. Source linked below.<\/p>\n\n\n\n

      What is the current situation in the EU\/EASA world?<\/h2>\n\n\n\n
        \n
      • EASA-AD 2024-0236<\/strong> (effective since 17.12.2024) already addressed Coolant contamination<\/em> on TAE 125, with reference to previous revisions of the same Continental SB. Similar in content (analysis\/flushing), but without<\/em> Now introduced by the FAA Specific exchange obligation in case of Al\/fluoride exceedance<\/strong> according to Rev. 4.<\/li>\n\n\n\n
      • N-registered aeroplanes<\/strong> in Europe, the FAA-AD must: from 30.10.2025<\/em> fulfilling.<\/li>\n\n\n\n
      • EASA registered aircraft:<\/strong> Until an EASA follow-up AD appears, 2024-0236<\/em> binding. Recommendation from an operator\/safety point of view:<\/em> Rev. 4 limits (FAA level) proactive<\/strong> take over.<\/li>\n<\/ul>\n\n\n\n

        Sources: EASA AD 2024-0236 (TAE 125-02-125; effective 17.12.2024), FAA AD 2025-20-18 (effective 30.10.2025). Downstairs on the left.<\/p>\n\n\n\n

        <\/p>\n\n\n\n

        Practice checklist for operators & clubs (ELA1)<\/h2>\n\n\n\n
          \n
        1. Clarify document status:<\/strong> Engine type\/series number, last coolant maintenance, analyses already carried out and their limits.<\/li>\n\n\n\n
        2. Take the sample:<\/strong> According to SB CG 125-1030 P1, Rev. 4 (clean bottle, warm, label correctly).<\/li>\n\n\n\n
        3. Test laboratory results:<\/strong>\n
            \n
          • Aluminium\/fluoride > Limit values<\/em> \u2192 Replace cylinder head<\/strong>, Rinse system, refill (G40 recommended).<\/li>\n\n\n\n
          • Other limits > Limit<\/em> \u2192 rinsing<\/strong> + Refill, then short interval check.<\/li>\n<\/ul>\n<\/li>\n\n\n\n
          • Document limit values\/revision:<\/strong> Record in the logbook whether Rev. 4<\/em> has been assessed.<\/li>\n\n\n\n
          • Spare parts\/lead time:<\/strong> Check cylinder head availability, installation only \u2018serviceable part\u2019.<\/li>\n\n\n\n
          • N-Reg in EU:<\/strong> FAA Compliance up to 5 FH<\/em> after effectiveness (if \u226550 FH since last coolant change), otherwise up to 50 FH \u2013 see AD compliance.<\/li>\n<\/ol>\n\n\n\n

            <\/p>\n\n\n\n

            sources<\/h2>\n\n\n\n
              \n
            • FAA - Federal Register: AD 2025-20-18 (TAE 125-02-125)<\/em>, published 15.10.2025, effective 30.10.2025. (Full text, \u2018Dates\u2019, \u2018AD Requirements\u2019)<\/li>\n\n\n\n
            • FAA DRS - Entry in Federal Register Document (Docket FAA-2025-3432)<\/li>\n\n\n\n
            • EASA \u2013 AD 2024-0236<\/em> \u2018Engine Coolant Contamination \u2013 Inspection\u2019 (TAE 125-02-125), effective 17.12.2024<\/li>\n\n\n\n
            • Continental SB CG 125-1030 P1 (Rev. 4 & Rev. 6) \u2013 Coolant analysis\/limit values<\/li>\n<\/ul>","protected":false},"excerpt":{"rendered":"

              The FAA published the AD 2025-20-18 for Continental TAE 125-02-125 engines on 15 October 2025, effective from 30 October 2025.<\/p>","protected":false},"author":1,"featured_media":3437,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_rtcl_gb_attr":"","ngg_post_thumbnail":0,"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[340],"tags":[360,410,412,413,414,411],"class_list":["post-3435","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-news","tag-c172","tag-continental-diesel","tag-da42","tag-diamond-da40","tag-dr400","tag-engine"],"jetpack_featured_media_url":"https:\/\/www.aps-eb.de\/wp-content\/uploads\/2025\/10\/FAA_AD.webp","jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/www.aps-eb.de\/en\/wp-json\/wp\/v2\/posts\/3435","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.aps-eb.de\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.aps-eb.de\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.aps-eb.de\/en\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.aps-eb.de\/en\/wp-json\/wp\/v2\/comments?post=3435"}],"version-history":[{"count":1,"href":"https:\/\/www.aps-eb.de\/en\/wp-json\/wp\/v2\/posts\/3435\/revisions"}],"predecessor-version":[{"id":20837,"href":"https:\/\/www.aps-eb.de\/en\/wp-json\/wp\/v2\/posts\/3435\/revisions\/20837"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.aps-eb.de\/en\/wp-json\/wp\/v2\/media\/3437"}],"wp:attachment":[{"href":"https:\/\/www.aps-eb.de\/en\/wp-json\/wp\/v2\/media?parent=3435"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.aps-eb.de\/en\/wp-json\/wp\/v2\/categories?post=3435"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.aps-eb.de\/en\/wp-json\/wp\/v2\/tags?post=3435"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}