{"id":"F2005L01303","name":"AD/JT8D/12 Amdt 2 - High Pressure Compressor Disc Tie Rod Hole","slug":"ad-jt8d-12-amdt-2-high-pressure-compressor-disc-tie-rod-hole","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":35040,"registerId":"commonwealth-F2005L01303-current","compilationNumber":null,"startDate":"2026-04-01","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"Pratt and Whitney Turbine Engines - JT8D","sectionType":"division","heading":"Pratt and Whitney Turbine Engines - JT8D Series","content":"### Pratt and Whitney Turbine Engines - JT8D Series\n\n| AD/JT8D/12 Amdt 2 | High Pressure Compressor Disc Tie Rod Hole | 7/2005 |\n| ----------------- | ------------------------------------------ | ------ |\n\n| Applicability: | Pratt & Whitney (P&W) JT8D-1, -1A, -7, -7A, -7B, -9, -9A, -11, -15, -15A, -17,-17A, -17R, and -17AR turbofan engines.                                                                                                                                                                                                                                                                                                                                                                                 |\n| -------------- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n| Requirement:   | Inspect 9th through 12th stage High Pressure Compressor (HPC) disks at the tie-rod holes in accordance with the Requirements of Federal Aviation Administration (FAA) Airworthiness Directive (AD) 95-16-07.Note: FAA AD 95-16-07 Amendment 39-9327 refers.                                                                                                                                                                                                                                           |\n| Compliance:    | Unless previously accomplished, as per compliance schedule of the FAA AD95-16-07.                                                                                                                                                                                                                                                                                                                                                                                                                     |\n|                | This Amendment becomes effective on 7 July 2005.                                                                                                                                                                                                                                                                                                                                                                                                                                                      |\n| Background:    | There have been reports of uncontained failure of 9th through 12th HPC discs because of the cracks originating from tie-rod holes. The inspection requirements of this AD are aimed at detection of cracks and prevention of resultant uncontained failures.The current amendment deletes reference to the manufacturer’s document and refers to the FAA AD as part of the harmonisation with the engine certificating Authority requirements.Amendment 1 of this Directive became effective in 1987. |\n\n![](image.001.png)  \nJames Coyne  \nDelegate of the Civil Aviation Safety Authority\n\n25 May 2005","sortOrder":0},{"sectionNumber":"AD/JT8D/12 Amdt 2","sectionType":"part","heading":"AD/JT8D/12 Amdt 2","content":"## AD/JT8D/12 Amdt 2","sortOrder":1},{"sectionNumber":"High Pressure Compressor Disc Tie Rod Ho","sectionType":"part","heading":"High Pressure Compressor Disc Tie Rod Hole","content":"## High Pressure Compressor Disc Tie Rod Hole","sortOrder":2},{"sectionNumber":"7/2005","sectionType":"part","heading":"7/2005","content":"## 7/2005","sortOrder":3}],"analysis":{"flash_summary_failed":{"failed":true,"reason":"Unauthenticated. Configure AI_GATEWAY_API_KEY or use a provider module. Learn more: https://ai-sdk.dev/unauthenticated-ai-gateway","source":"analysis-cron"},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"This amendment does not expand the directive's technical scope (still requires the same inspections of 9th–12th stage HPC discs). It only removes a reference to a manufacturer document and replaces it with a direct reference to FAA AD 95‑16‑07, i.e. harmonisation with the engine certificating authority. The change is procedural (which external document specifies the inspection details) rather than substantive."},"complexity_factors":["Single substantive requirement: inspect 9th–12th stage HPC discs at tie‑rod holes","Cross‑reference dependency to FAA AD 95‑16‑07 for methods and compliance timing","Multiple engine models listed in applicability (broad but discrete list)","Amendment limited to deleting manufacturer doc reference and harmonising with FAA AD","Short text with minimal conditional logic or nested exceptions"],"plain_english_summary":"This amendment requires inspections of 9th–12th stage HPC discs at tie‑rod holes on listed Pratt & Whitney JT8D engines, to be carried out per FAA AD 95‑16‑07 (replacing a manufacturer reference), effective 7 July 2005.\n\nIt affects aircraft operators, owners and maintenance personnel of the specified JT8D variants. The aim is to detect cracks that can cause uncontained disc failure; compliance raises inspection, repair and downtime costs for operators while CASA enforces the FAA‑referenced schedule."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This amendment maintains the original scope of ensuring safety of JT8D engine compressor discs. The only change is administrative — replacing a reference to manufacturer documents with a reference to the FAA directive to harmonise with the certificating authority. The core safety purpose (preventing uncontained engine failures) remains unchanged since the original 1987 directive."},"complexity_factors":["Very short document (approximately 200 words)","Only 1 substantive requirement (inspect specific engine parts)","No defined terms section","No cross-references to other Australian legislation","Single external reference to FAA AD 95-16-07 for technical details","Simple conditional structure: inspect unless already done","Narrow, technical scope affecting only specific P&W JT8D engine models"],"plain_english_summary":"This is an **airworthiness directive** (a mandatory safety order) for specific Pratt & Whitney jet engines used in aircraft. It requires airlines and aircraft operators to inspect certain engine parts — specifically the 9th through 12th stage high-pressure compressor discs at their tie-rod holes — for cracks. These cracks have previously caused engine parts to break off and fly out uncontrollably (called an \"uncontained failure\"), which is extremely dangerous. The directive tells operators to follow inspection procedures set by the US Federal Aviation Administration (FAA). This version (Amendment 2) updates the previous Australian directive by removing references to the manufacturer's own documents and instead pointing directly to the FAA's safety order, aligning Australia's rules with the American regulator's requirements."}},"importantCases":[],"_links":{"self":"/api/acts/ad-jt8d-12-amdt-2-high-pressure-compressor-disc-tie-rod-hole","history":"/api/acts/ad-jt8d-12-amdt-2-high-pressure-compressor-disc-tie-rod-hole/history","analysis":"/api/acts/ad-jt8d-12-amdt-2-high-pressure-compressor-disc-tie-rod-hole/analysis","conflicts":"/api/acts/ad-jt8d-12-amdt-2-high-pressure-compressor-disc-tie-rod-hole/conflicts","importantCases":"/api/acts/ad-jt8d-12-amdt-2-high-pressure-compressor-disc-tie-rod-hole/important-cases","documents":"/api/acts/ad-jt8d-12-amdt-2-high-pressure-compressor-disc-tie-rod-hole/documents"}}