{"id":"F2005L01017","name":"AD/THIELERT/4 - Introduction of Chapter 5 to TAE125-01 Operation and Maintenance Manual","slug":"ad-thielert-4-introduction-of-chapter-5-to-tae125-01-operation-and-maintenance-manual","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":34514,"registerId":"commonwealth-F2005L01017-current","compilationNumber":null,"startDate":"2026-04-01","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"Thielert Piston Engines","sectionType":"division","heading":"Thielert Piston Engines","content":"### Thielert Piston Engines\n\n| AD/THIELERT/4 | Introduction of Chapter 5 to TAE125-01 Operation and Maintenance Manual | 6/2005 DM |\n| ------------- | ----------------------------------------------------------------------- | --------- |\n\n| Applicability: | Thielert Aircraft Engine Model TAE125-01.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 |\n| -------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n| Requirement:   | 1. Revise Thielert TAE125-01 Operation & Maintenance Manual (OMM) No. OM 02-01 by:a. introducing a new section under the heading “Chapter 5 - Airworthiness Limitations Section” by inserting a copy of this Airworthiness Directive (AD); andb. inserting Chapter 5 of the OMM dated 05 April 2005 or later LBA approved revision.2. Accomplish maintenance actions prescribed in Chapter 5 of OMM.Note: German LBA AD D-2005-152 dated 07 April 2005 as approved by EASA approval 2005-3187 dated 07 April 2005 refers. |\n| Compliance:    | 1. Unless previously accomplished, within seven days after the effective date of this AD.2. As per the schedule specified in Chapter 5 (Airworthiness Limitations Section) of the OMM, introduced per Requirement 1.                                                                                                                                                                                                                                                                                                      |\n|                | This Airworthiness Directive becomes effective on 4 May 2005.                                                                                                                                                                                                                                                                                                                                                                                                                                                             |\n| Background:    | There has been an in-flight engine shut-down due to non-compliance with the prescribed maintenance actions in the Thielert TAE125-01 OMM.In order to prevent further events related to the lack of maintenance, this AD mandates several maintenance actions by introducing Chapter 5 (Airworthiness Limitations Section) to the Thielert TAE125-01 Operation & Maintenance Manual.                                                                                                                                       |\n\n|     | This AD addresses the unsafe condition associated with the lack of maintenance. |\n| --- | ------------------------------------------------------------------------------- |\n\n![](image.001.png)  \nJames Coyne  \nDelegate of the Civil Aviation Safety Authority\n\n28 April 2005","sortOrder":0},{"sectionNumber":"AD/THIELERT/4","sectionType":"part","heading":"AD/THIELERT/4","content":"## AD/THIELERT/4","sortOrder":1},{"sectionNumber":"Introduction of Chapter 5 to TAE125-01 O","sectionType":"part","heading":"Introduction of Chapter 5 to TAE125-01 Operation and Maintenance Manual","content":"## Introduction of Chapter 5 to TAE125-01 Operation and Maintenance Manual","sortOrder":2},{"sectionNumber":"6/2005 DM","sectionType":"part","heading":"6/2005 DM","content":"## 6/2005 DM","sortOrder":3}],"analysis":{"flash_summary_failed":{"failed":true,"reason":"A positive credit balance is required for all requests, including BYOK, so fallback providers remain available. Add credits at https://vercel.com/d?to=%2F%5Bteam%5D%2F%7E%2Fai%3Fmodal%3Dtop-up to continue.","source":"analysis-cron"},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This AD maintains its original narrow scope — addressing a specific unsafe condition in a specific engine model through mandatory manual updates. The scope has not expanded beyond the immediate safety issue identified (in-flight shutdown due to missed maintenance)."},"complexity_factors":["Single, specific engine model targeted (TAE125-01)","Only two main requirements: manual revision and scheduled maintenance compliance","No defined terms section or interpretation provisions","Simple two-part compliance structure with clear deadlines","No cross-references to other legislation beyond noting the German/EASA source AD","Background provides clear safety rationale without legal ambiguity"],"plain_english_summary":"**What this is:** This is an Airworthiness Directive (AD) — a mandatory safety order issued by Australia's Civil Aviation Safety Authority (CASA) for aircraft engines.\n\n**What it does:** It forces owners and operators of Thielert TAE125-01 aircraft engines to update their official manuals by adding a new \"Chapter 5 - Airworthiness Limitations Section.\" This chapter contains mandatory maintenance schedules and actions that must be followed to keep the engine airworthy (legally safe to fly).\n\n**Who it affects:** Anyone who owns, operates, or maintains an aircraft with a Thielert TAE125-01 engine — a diesel aircraft engine commonly used in light aircraft.\n\n**Why it matters:** An engine failed in flight because required maintenance wasn't done. This AD prevents future engine failures by making certain maintenance actions legally mandatory rather than just recommended. If you don't comply, your aircraft cannot legally fly.\n\n**What you must do:**\n- Within 7 days of this AD taking effect: Insert the new Chapter 5 into your engine manual and add this AD to that chapter\n- Ongoing: Perform all maintenance actions listed in Chapter 5 according to the schedules specified there"},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The instrument's scope is confined to introducing an Airworthiness Limitations Chapter into the Thielert TAE125-01 OMM and mandating compliance with that Chapter's maintenance schedule. It does not broaden applicability beyond the stated engine model and stays aligned with the stated aim of preventing shutdowns from missed maintenance (Requirement; Applicability; Background)."},"complexity_factors":["Clear, narrow applicability limited to Thielert TAE125-01 engines (Applicability).","Short initial compliance deadline (within seven days) for revising the OMM (Compliance: 1).","Two-tier obligation: immediate manual update and ongoing maintenance per the Chapter 5 schedule (Requirement: 1 and Compliance: 2).","Cross-jurisdictional references to German LBA AD and EASA approval which may affect accepted revisions (Requirement Note).","Operational burden lies with operators/maintenance organisations who must revise manuals, implement tasks, and track schedules (Requirement; Background).","Regulatory enforcement by the Civil Aviation Safety Authority is implicit (signature/effective date and Compliance provisions)."],"plain_english_summary":"This Airworthiness Directive requires operators of Thielert TAE125‑01 engines to add Chapter 5 (Airworthiness Limitations) to the engine Operation & Maintenance Manual and to carry out the maintenance tasks specified there. It applies to all TAE125‑01 engines, requires manual revision within seven days and ongoing compliance with the Chapter 5 schedule. Operators and maintenance organisations bear the compliance costs; the regulator enforces the directive. The stated purpose is to prevent further in‑flight shutdowns linked to missed maintenance (Background)."}},"importantCases":[],"_links":{"self":"/api/acts/ad-thielert-4-introduction-of-chapter-5-to-tae125-01-operation-and-maintenance-manual","history":"/api/acts/ad-thielert-4-introduction-of-chapter-5-to-tae125-01-operation-and-maintenance-manual/history","analysis":"/api/acts/ad-thielert-4-introduction-of-chapter-5-to-tae125-01-operation-and-maintenance-manual/analysis","conflicts":"/api/acts/ad-thielert-4-introduction-of-chapter-5-to-tae125-01-operation-and-maintenance-manual/conflicts","importantCases":"/api/acts/ad-thielert-4-introduction-of-chapter-5-to-tae125-01-operation-and-maintenance-manual/important-cases","documents":"/api/acts/ad-thielert-4-introduction-of-chapter-5-to-tae125-01-operation-and-maintenance-manual/documents"}}