{"id":"F2006B07826","name":"Airworthiness Directives 2004 - Revocation and Remaking - De Havilland Piston Engines","slug":"airworthiness-directives-2004-revocation-and-remaking-de-havilland-piston-engines","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":50727,"registerId":"commonwealth-F2006B07826-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"Airworthiness Directives 2004 - Revocation and Remaking - De Havilland Piston Engines","content":"Airworthiness Directives 2004\n\nI, DAVID ALAN VILLIERS, delegate of the Civil Aviation Safety\n\nAuthority, acting under subregulation 39.001 (1) of the Civil\n\nAviation Safety Regulations 1998:\n\n(a) revoke the Airworthiness Directives mentioned in\n\nSchedule 1; and\n\n(b) make, as separate instruments, each Airworthiness\n\nDirective mentioned in Schedule 1 and attached.\n\n![](image.001.png)\n\nDavid Villiers\n\nDelegate of the Civil Aviation Safety Authority\n\n20 December 2004\n\nNote: Each attached Airworthiness Directive is being re-made in exactly the\n\nsame form as appears in the latest published edition of the Directive.\n\n  \nSchedule 1 Revocation and Remaking of\n\nAirworthiness Directives\n\nDe Havilland Piston Engines\n\nAD Name AD Number\n\nAccessory Drive Shaft - Modification to Provide Weak Neck AD/DHE/1\n\nCANCELLED AD/DHE/2\n\nPropeller Oil Transfer System - Modification AD/DHE/3\n\nSupercharger Drive System - Modification AD/DHE/4\n\nSun Gear Distance Piece - Modification AD/DHE/5\n\nConnecting Rod Securing Nuts - Modification AD/DHE/6\n\nThrottle Bell Crank Pivot Stud - Modification AD/DHE/7\n\nGudgeon Pin - Replacement AD/DHE/8\n\nEngine Speed - Restriction AD/DHE/9\n\nNOT ISSUED AD/DHE/10\n\nNOT ISSUED AD/DHE/11\n\nNOT ISSUED AD/DHE/12\n\nNOT ISSUED AD/DHE/13\n\nNOT ISSUED AD/DHE/14\n\nNOT ISSUED AD/DHE/15\n\nNOT ISSUED AD/DHE/16\n\nCarburettor - Inspection AD/DHE/17\n\nTapered Crankshaft Inspection AD/DHE/18 Amdt 5\n\nCrankshaft - Inspection and Modification AD/DHE/19\n\nPropeller Shaft - Inspection and Modification AD/DHE/20 Amdt 1\n\nMinimum Modification Standard at Major Reconditioning AD/DHE/21\n\nMinimum Modification Standard at Major Reconditioning AD/DHE/22\n\nMinimum Modification Standard at Major Reconditioning AD/DHE/23\n\nMinimum Modification Standard at Major Reconditioning AD/DHE/24\n\nMinimum Modification Standard at Major Reconditioning AD/DHE/25\n\nInduction Manifold - Pressure Test AD/DHE/26\n\nFuel Control Unit - Boost Capsule - Replacement AD/DHE/27","sortOrder":0}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":3,"scope_assessment":{"changed":false,"description":"This instrument performs a pure administrative remaking without altering scope. The note explicitly states each directive is re-made 'in exactly the same form as appears in the latest published edition.' The scope remains limited to De Havilland piston engines and the specific maintenance requirements previously established."},"complexity_factors":["Single operative provision with straightforward binary structure (revoke and remake)","No defined terms section—relies entirely on external references to the Civil Aviation Safety Regulations 1998","Schedule 1 is a simple table listing 27 directives by name and number","Note clarifies that substantive content remains unchanged, reducing interpretive burden","No conditional logic, exceptions, or nested provisions in the instrument itself","Complexity resides entirely in the attached (unprovided) Airworthiness Directives, not in this remaking instrument"],"plain_english_summary":"This is an official aviation safety instrument that updates maintenance rules for old De Havilland piston aircraft engines. The Civil Aviation Safety Authority (CASA) delegate is revoking (cancelling) the old versions of 27 specific Airworthiness Directives (safety rules) and immediately re-making them as fresh legal instruments. These directives cover things like inspecting crankshafts, modifying supercharger drives, replacing fuel control parts, and pressure-testing induction manifolds. The rules are being kept exactly the same as before—this is just an administrative 'refresh' to ensure the directives remain legally valid under current regulations. If you own, operate, or maintain a vintage aircraft with a De Havilland piston engine (like a Gipsy Queen or Gipsy Six), these rules tell you what inspections and modifications you must perform to keep the engine airworthy."},"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"},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The instrument revokes and re‑issues the listed ADs without substantive change: the note states each re‑made AD is in exactly the same form as the latest published edition, so the practical regulatory scope and obligations for operators remain unchanged. The change is procedural/administrative rather than substantive."},"complexity_factors":["Legal authority: action taken under subregulation 39.001(1) (identifies delegated decision‑maker)","Administrative: revocation plus re‑making of multiple ADs as separate instruments increases document management tasks","Number of items: Schedule 1 lists many ADs (including entries marked CANCELLED or NOT ISSUED), requiring careful cross‑checking","Form preservation: each re‑made AD is stated to be “exactly the same” as the latest published edition, creating potential consistency checks","References to amendments: some ADs note amendments (e.g. Amdt 5, Amdt 1), requiring attention to versioning","Operational impact: compliance burden falls on operators and maintenance organisations to follow the re‑issued instruments","Low substantive change: no new technical requirements are introduced, but administrative transition may cause temporary confusion"],"plain_english_summary":"This instrument, made by a Civil Aviation Safety Authority delegate under subregulation 39.001(1), cancels a list of De Havilland piston‑engine Airworthiness Directives (ADs) in Schedule 1 and re‑makes each AD as a separate instrument in the same form as the latest published edition. It affects aircraft owners, operators and maintenance organisations who must continue to comply with the listed ADs; the delegate decides the instrument form and operators bear the compliance and administrative costs."}},"importantCases":[],"_links":{"self":"/api/acts/airworthiness-directives-2004-revocation-and-remaking-de-havilland-piston-engines","history":"/api/acts/airworthiness-directives-2004-revocation-and-remaking-de-havilland-piston-engines/history","analysis":"/api/acts/airworthiness-directives-2004-revocation-and-remaking-de-havilland-piston-engines/analysis","conflicts":"/api/acts/airworthiness-directives-2004-revocation-and-remaking-de-havilland-piston-engines/conflicts","importantCases":"/api/acts/airworthiness-directives-2004-revocation-and-remaking-de-havilland-piston-engines/important-cases","documents":"/api/acts/airworthiness-directives-2004-revocation-and-remaking-de-havilland-piston-engines/documents"}}