{"id":"F2013L01704","name":"AESB 12/3050 - Approval - means of compliance with Airworthiness Directive for Grob G 109 and G 109 B aircraft","slug":"aesb-12-3050-approval-means-of-compliance-with-airworthiness-directive-for-grob-g-109-and-g-109-b-ai","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":127750,"registerId":"commonwealth-F2013L01704-current","compilationNumber":null,"startDate":"2026-04-03","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AESB 12/3050 - Approval - means of compliance with Airworthiness Directive for Grob G 109 and G 109 B aircraft","content":"![](image.001.jpeg)\n\nInstrument number A&ESB 12/3050\n\nI, MICHAEL JAMES HIGGINS, Manager Continuing Airworthiness Section, Airworthiness and Engineering Standards Branch, Standards Division, a delegate of CASA, make this instrument under paragraph 39.004 (3) (a) of the Civil Aviation Safety Regulations 1998.\n\n![](image.002.png)\n\nMike Higgins\n\nManager Continuing Airworthiness Section Airworthiness and Engineering Standards Branch Standards Division\n\n16 September 2013\n\nApproval — means of compliance with Airworthiness Directive for\n\n![](image.003.png)Grob G 109 and G 109 B aircraft\n\n1 Duration\n\nThis instrument:\n\n(a) commences on the day of registration; and\n\n(b) ceases to have effect if European Aviation Safety Agency Airworthiness\n\nDirective 2012\\-0027 (the AD) is amended or cancelled.\n\n2 Application\n\nThis instrument applies to any Grob G109 or Grob G 109 B aircraft registered in\n\nAustralia and engaged in operations within Australian territory (the aircraft).\n\n3 Approved means of compliance\n\nI approve for the aircraft, as a means of compliance with paragraphs (2) and (3) of the AD other than that set out in paragraphs (2) and (3) of the AD, the completion of both of the following actions:\n\n(a) during the next scheduled 50 hours inspection or within 3 months, whichever occurs first after the effective date of the AD, and thereafter at intervals not to exceed 100 flight hours, inspection of the nose plate part number 109\\-2160.01 in the vertical stabiliser in accordance with the section of GFA Engineering Order 2012\\-3 Issue 1 titled “Inspection”; and\n\n(b) prior to, or concurrent with the initial inspection as required by\n\nparagraph (a), installation of 2 borescope access holes on the left side of the vertical stabiliser in accordance with the section of GFA Engineering Order\n\n![](image.004.png)2012\\-3 Issue 1 titled “Inspection hole positions”.","sortOrder":0}],"analysis":{"flash_summary_failed":{"failed":true,"reason":"Unauthenticated. Configure AI_GATEWAY_API_KEY or use a provider module. Learn more: https://ai-sdk.dev/unauthenticated-ai-gateway","source":"analysis-cron"},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This instrument maintains its original narrow scope - it is a specific approval for alternative compliance with a single airworthiness directive for a particular aircraft type. There is no evidence of scope creep; it remains tightly focused on the Grob G 109 series and the specific safety issue addressed by EASA AD 2012-0027."},"complexity_factors":["Single, specific aircraft type (Grob G 109 series) with narrow application","Only 3 operative sections (Duration, Application, Approved means of compliance)","No defined terms section - terms used are either self-explanatory or reference external documents by specific number","Simple conditional logic: 'whichever occurs first' is the only conditional element","Single cross-reference to external document (European Aviation Safety Agency Airworthiness Directive 2012-0027)","Straightforward two-step compliance requirement (inspection + installation)","Automatic sunset clause tied to amendment/cancellation of referenced AD"],"plain_english_summary":"This CASA approval lets Australian-registered Grob G 109/G 109 B owners use the GFA Engineering Order 2012-3 as an alternative means of complying with European Airworthiness Directive 2012-0027. It affects operators of these motor gliders used for towing and training.\n\nOperators must inspect the vertical‑stabiliser nose plate every 100 flight hours (next at the upcoming 50‑hour or within 3 months) and fit two borescope access holes. The approval preserves equivalent safety and lapses if the European directive changes."},"flash_summary":{"complexity_score":4,"scope_assessment":{"changed":true,"description":"This instrument substitutes an alternative means of compliance for paragraphs (2) and (3) of EASA AD 2012‑0027 for Australian‑registered Grob G109/G109B aircraft, so it changes how affected Australian aircraft must comply with those AD requirements. It applies only to Australian‑registered aircraft operating in Australia and will cease effect if the AD is amended or cancelled (see s2, s3, s1(b))."},"complexity_factors":["Cross-reference to an external EASA Airworthiness Directive and phrasing that replaces specified AD paragraphs (requires reading both instruments) (s3).","Dependence on a technical engineering order (GFA Engineering Order 2012‑3 Issue 1) for procedural detail and tolerances (s3(a),(b)).","Specific timing and interval rules: initial inspection within next 50‑hour check or 3 months, then at intervals not exceeding 100 flight hours — scheduling and record‑keeping burden (s3(a)).","Mandated installation of physical borescope access holes prior to or concurrent with first inspection—minor structural work and coordination with maintenance schedules (s3(b)).","Limited geographic and registry scope: applies only to Australian‑registered aircraft engaged in operations within Australian territory (s2).","Temporal contingency: instrument ceases if the referenced AD is amended or cancelled, requiring monitoring of external regulatory changes (s1(b)).","Delegated administrative decision by CASA (instrument made by a CASA delegate under Civil Aviation Safety Regulations), concentrating interpretive authority in the regulator (instrument header/signature)."],"plain_english_summary":"This instrument approves an alternative way for Australian‑registered Grob G 109 and G 109B aircraft to comply with specified paragraphs of EASA Airworthiness Directive 2012‑0027. It requires installation of two borescope access holes and repeated inspections of nose plate P/N 109‑2160.01 according to GFA Engineering Order 2012‑3 Issue 1. The CASA delegate authorises the approval; aircraft owners/operators must carry out and pay for the work and meet the inspection schedule. The approval starts on registration and ceases if the AD is amended or cancelled (see s2, s3, s1(b))."}},"importantCases":[],"_links":{"self":"/api/acts/aesb-12-3050-approval-means-of-compliance-with-airworthiness-directive-for-grob-g-109-and-g-109-b-ai","history":"/api/acts/aesb-12-3050-approval-means-of-compliance-with-airworthiness-directive-for-grob-g-109-and-g-109-b-ai/history","analysis":"/api/acts/aesb-12-3050-approval-means-of-compliance-with-airworthiness-directive-for-grob-g-109-and-g-109-b-ai/analysis","conflicts":"/api/acts/aesb-12-3050-approval-means-of-compliance-with-airworthiness-directive-for-grob-g-109-and-g-109-b-ai/conflicts","importantCases":"/api/acts/aesb-12-3050-approval-means-of-compliance-with-airworthiness-directive-for-grob-g-109-and-g-109-b-ai/important-cases","documents":"/api/acts/aesb-12-3050-approval-means-of-compliance-with-airworthiness-directive-for-grob-g-109-and-g-109-b-ai/documents"}}