{"id":"F2006B07934","name":"Airworthiness Directives 2004 - Revocation and Remaking - Omnipol Piston Engines","slug":"airworthiness-directives-2004-revocation-and-remaking-omnipol-piston-engines","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":50991,"registerId":"commonwealth-F2006B07934-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 - Omnipol 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\nOmnipol Piston Engines\n\nAD Name AD Number\n\nConnecting Rods - Replacement AD/OM-P/1\n\nCylinder Heads - Inspection and Replacement AD/OM-P/2\n\nThrottle Lever Screw - Replacement AD/OM-P/3 Amdt 1\n\nPiston Pin Circlip - Replacement and Installation Procedure AD/OM-P/4","sortOrder":0}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This instrument maintains identical scope to the original Airworthiness Directives. The note explicitly confirms each directive is re-made \"in exactly the same form\" — this is purely a structural/administrative reorganization, not an expansion or alteration of regulatory scope."},"complexity_factors":["Very short instrument (under 300 words)","Only 4 substantive items in Schedule 1, presented as a simple table","No defined terms section","No conditional logic or nested exceptions","Single operative provision with straightforward (a) and (b) structure","Cross-reference limited to one subregulation (39.001(1)) and internal references to Schedule 1","Explicit note clarifying no substantive change to content"],"plain_english_summary":"**What this legislation does:**\n\nThis instrument is an administrative housekeeping measure by the Civil Aviation Safety Authority (CASA). It **revokes** (cancels) four existing Airworthiness Directives (ADs) relating to Omnipol piston engines and **immediately remakes** them as four separate, standalone legal instruments.\n\n**Who it affects:**\n\n- **Aircraft owners and operators** who use Omnipol piston engines\n- **Maintenance engineers** who work on these engines\n- **The aviation industry** more broadly, as these ADs set mandatory safety requirements\n\n**Why it matters:**\n\nAirworthiness Directives are **legally binding safety orders** issued when a design flaw, manufacturing defect, or maintenance issue poses a risk to aircraft safety. This instrument doesn't change the actual safety requirements — the note explicitly states each directive is being \"re-made in exactly the same form\" — but it changes their legal structure. Instead of four directives bundled together in one 2004 instrument, they now exist as four separate instruments.\n\nThis matters because:\n- It makes each directive easier to find, update, and manage individually\n- It improves transparency — each safety requirement stands on its own\n- It follows better regulatory practice by avoiding \"omnibus\" instruments that bundle unrelated requirements\n\n**The four specific safety issues covered:**\n- **AD/OM-P/1**: Replacing connecting rods (engine components that link pistons to the crankshaft)\n- **AD/OM-P/2**: Inspecting and replacing cylinder heads (where fuel combustion occurs)\n- **AD/OM-P/3 Amdt 1**: Replacing throttle lever screws (controls engine power)\n- **AD/OM-P/4**: Replacing and properly installing piston pin circlips (retaining rings that secure piston pins)\n\n**Bottom line:** The safety rules stay exactly the same, but they're now organised more clearly as four separate documents rather than one combined document."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"Scope has not changed. The instrument revokes earlier AD instruments listed in Schedule 1 and re‑issues each AD in exactly the same form as the latest published edition, according to the Note. The action is administrative (revocation and re‑making) rather than a change to the substantive requirements of the listed ADs (see Note and Schedule 1)."},"complexity_factors":["Legal cross‑reference to Civil Aviation Safety Regulations (subregulation 39.001(1)) creates a dependency on external legislation for authority.","Multiple separate ADs are involved (four listed in Schedule 1), each carrying its own technical compliance obligations in their attached texts.","The instrument is procedural (revocation and re‑making) rather than substantive, requiring implementers to update records and references even though technical requirements remain unchanged (administrative complexity).","Delegated decisionmaker executed the instrument (CASA delegate), so understanding delegated authority and recordkeeping is necessary for compliance.","Attachments (the re‑made ADs) contain substantive obligations but are not reproduced in the revocation text, so readers must consult the attached instruments to assess full operational impact."],"plain_english_summary":"This instrument formally revokes four listed Airworthiness Directives for Omnipol piston engines and re‑issues each AD separately in exactly the same form. It does not change the substantive safety requirements.\n\nAffected parties—aircraft operators, owners and maintenance organisations with those engines—must continue to comply with the re‑made ADs; the action is administrative (updating legal form and records) and any compliance costs remain with operators."}},"importantCases":[],"_links":{"self":"/api/acts/airworthiness-directives-2004-revocation-and-remaking-omnipol-piston-engines","history":"/api/acts/airworthiness-directives-2004-revocation-and-remaking-omnipol-piston-engines/history","analysis":"/api/acts/airworthiness-directives-2004-revocation-and-remaking-omnipol-piston-engines/analysis","conflicts":"/api/acts/airworthiness-directives-2004-revocation-and-remaking-omnipol-piston-engines/conflicts","importantCases":"/api/acts/airworthiness-directives-2004-revocation-and-remaking-omnipol-piston-engines/important-cases","documents":"/api/acts/airworthiness-directives-2004-revocation-and-remaking-omnipol-piston-engines/documents"}}