{"id":"F2010L02494","name":"AD/PW4000/19 - High Pressure Compressor Rear Case","slug":"ad-pw4000-19-high-pressure-compressor-rear-case","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":84422,"registerId":"commonwealth-F2010L02494-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"Pratt and Whitney Turbine Engines - PW40","sectionType":"division","heading":"Pratt and Whitney Turbine Engines - PW4000 Series","content":"### Pratt and Whitney Turbine Engines - PW4000 Series\n\n| AD/PW4000/19 | High Pressure Compressor Rear Case | 19/2010 |\n| ------------ | ---------------------------------- | ------- |\n\n| Applicability: | Pratt and Whitney PW4000 engines as specified by models in FAA AD 2003-13-11.                                                                                                                                                                                                                                                                                                                                                                                                                                      |\n| -------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ |\n| Requirement:   | Unless already accomplished perform the initial inspections in accordance with the technical requirements of FAA AD 2003-13-11.Repeat the inspections in accordance with the technical requirements of FAA AD 2003-13-11.Later revisions to PW SB PW4G-112-72-256, dated 2 April 2003, approved by the United States Federal Aviation Administration (FAA) as an Alternate Method of Compliance (AMOC) to FAA AD 2003-13-11, are considered acceptable for compliance with the equivalent Requirements of this AD. |\n| Compliance:    | As specified in the Requirement Document with a revised effective date of14 October 2010.                                                                                                                                                                                                                                                                                                                                                                                                                          |\n|                | This Airworthiness Directive becomes effective on 14 October 2010.                                                                                                                                                                                                                                                                                                                                                                                                                                                 |\n| Background:    | This AD is issued as a result of reported cracks propagating from bolt holes in the High Pressure Compressor (HPC) rear case J flange. The actions specified in this AD are intended to prevent fracturing and rupturing of the HPC rear case.                                                                                                                                                                                                                                                                     |\n\n![](image.001.png)\n\nCharles Lenarcic  \nDelegate of the Civil Aviation Safety Authority\n\n16 September 2010","sortOrder":0},{"sectionNumber":"AD/PW4000/19","sectionType":"part","heading":"AD/PW4000/19","content":"## AD/PW4000/19","sortOrder":1},{"sectionNumber":"High Pressure Compressor Rear Case","sectionType":"part","heading":"High Pressure Compressor Rear Case","content":"## High Pressure Compressor Rear Case","sortOrder":2},{"sectionNumber":"19/2010","sectionType":"part","heading":"19/2010","content":"## 19/2010","sortOrder":3}],"analysis":{"flash_summary":{"complexity_score":4,"scope_assessment":{"changed":false,"description":"This directive adopts the technical inspection requirements of FAA AD 2003-13-11 for the specified PW4000 engines and permits FAA‑approved service bulletin revisions as alternate compliance. It does not expand the set of affected engines or add new types of mandatory action beyond those inspection and repeat requirements described (Applicability; Requirement)."},"complexity_factors":["Cross-reference to an external FAA airworthiness directive for technical inspection procedures, creating dependence on another instrument for full compliance (Applicability; Requirement).","Acceptance of later revisions to a Pratt & Whitney service bulletin only when approved by the FAA as an AMOC, adding an approval step and potential timing uncertainty (Requirement).","Operational burden of repeated inspections and recordkeeping for affected operators, requiring scheduling and maintenance costs (Requirement).","Narrow technical scope limited to specific PW4000 models, requiring accurate identification of applicability by operators and maintainers (Applicability).","Fixed effective date that creates a hard compliance deadline for operators to meet (Compliance)."],"plain_english_summary":"Requires initial and repeated inspections of the High Pressure Compressor (HPC) rear case on specified Pratt & Whitney PW4000 engines, performed to the technical steps in FAA AD 2003-13-11, to prevent cracking and rupture (Applicability; Requirement; Background).\n\nOperators must pay for and carry out the inspections, may use FAA‑approved service bulletin revisions as alternate methods of compliance, and must comply from 14 October 2010 as issued by the CASA delegate (Requirement; Compliance)."},"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 AD maintains its original narrow scope — addressing a specific mechanical defect in a specific engine series. It does not expand beyond the safety-critical inspection requirement for the HPC rear case cracking issue."},"complexity_factors":["Short, single-purpose document (approximately 250 words)","Only 1 defined term implicitly referenced (FAA AD 2003-13-11)","Heavy reliance on external technical documents — compliance requires cross-referencing to US FAA directive and Pratt & Whitney service bulletin","Simple conditional structure: 'Unless already accomplished' is the only exception clause","No nested definitions or multi-layered exceptions","Technical aviation terminology assumes specialist knowledge (HPC rear case, J flange, AMOC)"],"plain_english_summary":"This Airworthiness Directive mandates that operators of Pratt & Whitney PW4000 engines inspect the High Pressure Compressor rear case flange for cracks emanating from bolt holes and carry out recurring checks per the FAA’s technical instructions. It’s compulsory for affected operators because such cracking can cause rear case rupture and catastrophic engine failure. Effective 14 October 2010."}},"importantCases":[],"_links":{"self":"/api/acts/ad-pw4000-19-high-pressure-compressor-rear-case","history":"/api/acts/ad-pw4000-19-high-pressure-compressor-rear-case/history","analysis":"/api/acts/ad-pw4000-19-high-pressure-compressor-rear-case/analysis","conflicts":"/api/acts/ad-pw4000-19-high-pressure-compressor-rear-case/conflicts","importantCases":"/api/acts/ad-pw4000-19-high-pressure-compressor-rear-case/important-cases","documents":"/api/acts/ad-pw4000-19-high-pressure-compressor-rear-case/documents"}}