{"id":"F2006B07728","name":"Airworthiness Directives 2004 - Revocation and Remaking - Auxiliary Power Units","slug":"airworthiness-directives-2004-revocation-and-remaking-auxiliary-power-units","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":50460,"registerId":"commonwealth-F2006B07728-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 - Auxiliary Power Units","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\nAuxiliary Power Units\n\nAD Name AD Number\n\nTurbine Blade Containment Ring - Installation AD/APU/1\n\nInspection!! Placard!! Operational Limitations and/or Modification AD/APU/2\n\nIncorporation of Back-Up Plate to Improve Turbine Wheel Containment AD/APU/3\n\nFuel Solenoid Shut Off Valve - Inspection - CANCELLED AD/APU/4\n\nCooling Fan Assembly AD/APU/5 Amdt 2\n\nAugmentation Containment Ring - CANCELLED AD/APU/6 Amdt 1\n\nHigh Pressure Turbine Disc AD/APU/7\n\nGarrett APU Compressor Rotating Group AD/APU/8\n\nPW901A APU Idler Gear and Cooling Fan Shaft AD/APU/9\n\nGTCP 85 Series APU Axial Containment AD/APU/10\n\nTSCP700 HPT Disc AD/APU/11\n\nCompressor Wheel AD/APU/12\n\nAugmentation Containment Ring AD/APU/13\n\nTSCP700 First Stage LPC Disc AD/APU/14\n\nGTCP 36 Series APU Load Compressor Containment AD/APU/15\n\nT-62T APU Compressor Wheel Replacement AD/APU/16\n\nSaphir 20 Model 095 Female Quill Shaft Cycles Since New AD/APU/17 Amdt 1","sortOrder":0}],"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":3,"scope_assessment":{"changed":false,"description":"This instrument maintains identical scope to the original Airworthiness Directives. It is purely a procedural remaking exercise with no expansion of regulatory reach. The cancelled ADs (AD/APU/4 and AD/APU/6) represent a minor narrowing, not a scope expansion."},"complexity_factors":["Very short document (under 2 pages)","Simple binary structure: revoke old rules, make new ones","No defined terms section — relies on external aviation knowledge","No conditional logic or nested exceptions","Heavy reliance on external documents (the attached ADs themselves are not reproduced, only listed by title)","Single cross-reference to Civil Aviation Safety Regulations 1998 (subregulation 39.001(1)) — the legal power source"],"plain_english_summary":"This instrument revokes 17 existing Airworthiness Directives for aircraft Auxiliary Power Units and reissues those same safety requirements as separate, standalone legal instruments. It affects airlines, APU maintenance engineers, and owners of the listed APU models by keeping obligations identical but making each rule easier to find and amend. Two ADs (AD/APU/4 and AD/APU/6) are marked CANCELLED and removed."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The instrument explicitly revokes the listed ADs and re-makes each “in exactly the same form as appears in the latest published edition” (instrument text). It does not alter substantive technical requirements or expand scope; it changes legal form, numbering and record-keeping obligations (see subregulation 39.001(1) and Schedule 1)."},"complexity_factors":["Administrative revocation-and-remake mechanism under subregulation 39.001(1) (delegated decision-making).","Number of ADs listed in Schedule 1 (17 entries), some with amendments (Amdt 1/2) and some marked CANCELLED, increasing version-tracking needs.","Requirement to replace existing instruments with separately numbered, identical instruments creates record-keeping and cross-reference work for regulators and operators.","Compliance burden falls on aircraft owners, operators and maintenance organisations to identify and follow the re-made ADs (Schedule 1 lists affected items).","Potential for temporary operational confusion during transition between revoked and re-made instruments until registry and operator records are updated.","Attachments (the full texts of each re-made AD) are referenced but not reproduced here — full technical requirements depend on those texts."],"plain_english_summary":"This instrument revokes a list of existing Airworthiness Directives (ADs) for auxiliary power units and re‑issues each one as a separate, identical instrument under the delegate’s power (subregulation 39.001(1)).\n\nIt affects aircraft owners, operators and maintenance organisations responsible for the listed APUs because they must comply with the re‑made ADs; the stated purpose is administrative—preserving the directives in their latest published form—while changing legal form and record‑keeping obligations."}},"importantCases":[],"_links":{"self":"/api/acts/airworthiness-directives-2004-revocation-and-remaking-auxiliary-power-units","history":"/api/acts/airworthiness-directives-2004-revocation-and-remaking-auxiliary-power-units/history","analysis":"/api/acts/airworthiness-directives-2004-revocation-and-remaking-auxiliary-power-units/analysis","conflicts":"/api/acts/airworthiness-directives-2004-revocation-and-remaking-auxiliary-power-units/conflicts","importantCases":"/api/acts/airworthiness-directives-2004-revocation-and-remaking-auxiliary-power-units/important-cases","documents":"/api/acts/airworthiness-directives-2004-revocation-and-remaking-auxiliary-power-units/documents"}}