{"id":"F2008L02895","name":"AD/THIELERT/10 - Time Limits/Maintenance Checks","slug":"ad-thielert-10-time-limits-maintenance-checks","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":74794,"registerId":"commonwealth-F2008L02895-current","compilationNumber":null,"startDate":"2026-04-02","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/10 | Time Limits/Maintenance Checks | 9/2008 |\n| -------------- | ------------------------------ | ------ |\n\n| Applicability: | Thielert Aircraft Engines GmbH. TAE 125-01 engines.Note 1: These engines are known to be installed on, but not limited to, Cessna 172 and (Reims-built) F172 series (EASA STC Nr. EASA.A.S.01527); Piper PA-28 series (EASA STC Nr. EASA.A.S.01632), APEX (Robin) DR 400 series (EASA STC Nr. EASA.A.S.01380); and Diamond DA40 and DA42 aircraft.                                                                                                                   |\n| -------------- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n| Requirement:   | 1. Amend the approved engine maintenance schedule to incorporate the instructions of Chapter 5 “Airworthiness Limitations” of OM-02-01 Issue 3 Revision 5.2. Accomplish the tasks in accordance with the instructions of Chapter 5 “Airworthiness Limitations” of OM-02-01 Issue 3 Revision 5.The use of later approved revisions of this document is acceptable for compliance with the requirements of this AD.Note 2: EASA AD 2008-0128 dated 9 July 2008 refers. |\n| Compliance:    | For Requirement 1 - Within the next 3 months after the effective date of this AD, unless previously accomplished.For Requirement 2 - Within the thresholds and intervals defined from the time the amendment is made to the schedule in accordance with Requirement 1 of this AD.                                                                                                                                                                                    |\n|                | This Airworthiness Directive becomes effective on 28 August 2008.                                                                                                                                                                                                                                                                                                                                                                                                    |\n| Background:    | As a consequence of occurrences and service experience, Thielert Aircraft Engines GmbH has amended the ALS of the Operation & Maintenance Manual OM-02-01 to include an inspection of the alternator 14V P/N 02-7150-5502R3, and a replacement of the rail pressure valve. Failure of these parts could result in in-flight shut downs of the engine(s).                                                                                                             |\n\n![](image.001.png)  \nJames Coyne  \nDelegate of the Civil Aviation Safety Authority\n\n16 July 2008","sortOrder":0},{"sectionNumber":"AD/THIELERT/10","sectionType":"part","heading":"AD/THIELERT/10","content":"## AD/THIELERT/10","sortOrder":1},{"sectionNumber":"Time Limits/Maintenance Checks","sectionType":"part","heading":"Time Limits/Maintenance Checks","content":"## Time Limits/Maintenance Checks","sortOrder":2},{"sectionNumber":"9/2008","sectionType":"part","heading":"9/2008","content":"## 9/2008","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 is a standard, targeted airworthiness directive addressing specific component failures. It remains tightly scoped to the identified safety issue (alternator and rail pressure valve failures) and does not expand beyond the original maintenance schedule amendment purpose."},"complexity_factors":["Single, specific technical requirement with clear mechanical tasks (alternator inspection, valve replacement)","Only 2 compliance deadlines (3-month window for paperwork, ongoing schedule for physical work)","Minimal cross-referencing (only references one external manual: OM-02-01 Issue 3 Revision 5)","No nested exceptions or conditional logic — applies uniformly to all affected engines","Short document (~250 words) with straightforward applicability criteria","Single defined term (the engine model) with explicit aircraft type examples"],"plain_english_summary":"This AD requires owners and operators of aircraft fitted with Thielert TAE 125-01 diesel engines to update maintenance records within three months and to carry out mandated alternator inspection and rail pressure valve replacement on the new schedule. It targets common types like Cessna 172, Piper PA‑28, Robin DR400 and Diamond DA40/DA42. Failures have caused in‑flight engine shutdowns, so compliance is legally mandatory to maintain airworthiness."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The directive implements the manufacturer’s amendment to the Airworthiness Limitations Section by mandating incorporation of Chapter 5 of OM-02-01 and specified tasks for TAE 125-01 engines. The AD’s applicability and required actions align with the stated background (alternator inspection and rail pressure valve replacement) and do not expand or narrow the described engine/airframe scope beyond the document’s stated applicability and STC listings."},"complexity_factors":["Single, targeted action: amendment of approved maintenance schedule to incorporate Chapter 5 of OM-02-01 (administrative change with technical tasks).","Cross-reference to a specific manufacturer document (OM-02-01 Issue 3 Revision 5.2) and allowance for later approved revisions (requires document control).","Defined short compliance window (within 3 months of effective date) creating scheduling pressure for operators and maintenance providers.","Technical tasks include inspection of alternator P/N 02-7150-5502R3 and replacement of the rail pressure valve — requires parts, qualified maintenance labour and record-keeping.","Applicability spans TAE 125-01 engines installed under multiple STCs and aircraft types (Cessna, Piper, Robin, Diamond), widening the affected operator base.","Safety-driven objective (prevent in‑flight shutdowns) but enforcement relies on operators updating schedules and completing tasks — compliance monitoring and evidence retention needed."],"plain_english_summary":"Requires operators of Thielert TAE 125‑01 engines to amend their approved engine maintenance schedules to include Chapter 5 (“Airworthiness Limitations”) of OM‑02‑01 and to carry out the specified inspection and replacement tasks. The stated reason is to add an alternator inspection and a rail‑pressure‑valve replacement because failures could cause in‑flight engine shutdowns; compliance is required within three months and the direct costs (labour, parts, scheduling) fall on aircraft owners/operators."}},"importantCases":[],"_links":{"self":"/api/acts/ad-thielert-10-time-limits-maintenance-checks","history":"/api/acts/ad-thielert-10-time-limits-maintenance-checks/history","analysis":"/api/acts/ad-thielert-10-time-limits-maintenance-checks/analysis","conflicts":"/api/acts/ad-thielert-10-time-limits-maintenance-checks/conflicts","importantCases":"/api/acts/ad-thielert-10-time-limits-maintenance-checks/important-cases","documents":"/api/acts/ad-thielert-10-time-limits-maintenance-checks/documents"}}