{"id":"F2006B11032","name":"AD/JT9D/39 - One-Piece Fan Case Shield","slug":"ad-jt9d-39-one-piece-fan-case-shield","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":56641,"registerId":"commonwealth-F2006B11032-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"AIRWORTHINESS DIRECTIVE","sectionType":"part","heading":"AIRWORTHINESS DIRECTIVE","content":"# AIRWORTHINESS DIRECTIVE\n\n![](image.001.png)  \n\nFor the reasons set out in the background section, the CASA delegate whose signature appears below issues the following Airworthiness Directive (AD) under subregulation 39.1 (1) of CASR 1998. The AD requires that the action set out in the requirement section (being action that the delegate considers necessary to correct the unsafe condition) be taken in relation to the aircraft or aeronautical product mentioned in the applicability section: (a) in the circumstances mentioned in the requirement section; and (b) in accordance with the instructions set out in the requirement section; and (c) at the time mentioned in the compliance section.\n\n![](image.001.png)  \n\nPratt and Whitney Turbine Engines \\- JT9D Series","sortOrder":0},{"sectionNumber":"AD/JT9D/39 One-Piece Fan Case Shield 4/2","sectionType":"part","heading":"AD/JT9D/39 One-Piece Fan Case Shield 4/2004","content":"# AD/JT9D/39 One-Piece Fan Case Shield 4/2004\n\nApplicability: Pratt & Whitney (PW) JT9D-7R4D, \\-7R4D1, \\-7R4E, \\-7R4E1, \\-7R4E4, \\- 7R4G2, and\n\n\\-7R4H1 turbofan engines with steel fan cases.\n\nNote 1: These engines are installed on, but not limited to, Airbus Industrie A300 and A310, and Boeing 747 and 767 aeroplanes.\n\nRequirement: 1. For PW JT9D-7R4D, -7R4D1, -7R4E, -7R4E1, -7R4E4, and -7R4H1 turbofan engines with steel fan cases that have PW Service Bulletin (SB) 72-312 incorporated, replace fan case shield Part Number (P/N) 802095 with the four- piece fan case shield and install four fan case shield supports. Information on replacing fan case shields and installing fan case shield supports can be found in PW SB JT9D-7R4- 72-583.\n\n    2. For PW JT9D-7R4G2 turbofan engines with steel fan cases that have PW SB 72- 88 and PW SB 72-311 incorporated, replace fan case shield P/N 802094 with the four-piece fan case shield and install four fan case shield supports. Information on replacing fan case shields and installing fan case shield supports can be found in Part A of PW SB JT9D-7R4-72-584.\n\n    3. For PW JT9D-7R4G2 turbofan engines with steel fan cases that do not have PW SB 72-88 incorporated, but have PW SB 72-311 incorporated, replace fan case shield P/N 802094 with the four-piece fan case shield and install four fan case shield supports. Information on replacing fan case shields and installing fan case shield supports can be found in Part B of PW SB JT9D-7R4-72-584.\n\nNote 2: FAA AD 2004-01-08 Amdt 39-13422 refers.\n\nCompliance: Unless previously accomplished, at the next shop visit but no later than 31 December 2012.\n\nFor the purpose of this Directive, a shop visit is defined as separation of the B-flange during in-shop maintenance. Separation of the B-flange in order to replace fan case assemblies for rub strip repairs is not considered a shop visit.\n\nThis Airworthiness Directive becomes effective on 15 April 2004.","sortOrder":1}],"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"},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The AD's scope remains targeted to the same JT9D engine models with steel fan cases and prescribes a specific hardware replacement and support installation; it does not broaden affected models or require additional unrelated actions (Applicability; Requirement). The timing mechanism (next shop visit or 31 Dec 2012) and the shop‑visit definition narrow when operators must act, but do not change the population of affected engines (Compliance)."},"complexity_factors":["Multiple engine variants and conditional paths for different SB incorporations increase decision points for operators (Applicability; Requirement paras 1–3).","Mandated compliance tied to an operational maintenance milestone (‘next shop visit’) with a specific exception and a calendar deadline creates scheduling complexity (Compliance).","Work references several Pratt & Whitney Service Bulletins and parts (P/N 802095, 802094) requiring MRO access to SB JT9D-7R4-72-583 and JT9D-7R4-72-584 (Requirement paras 1–3).","Technical installation requires shop facilities and certified personnel; parts procurement and inventory lead times affect ability to meet the deadline (Requirement; Compliance).","Cross-reference to FAA AD adds an external regulatory linkage that may require coordination for operators under multiple jurisdictions (Note 2).","Definition of 'shop visit' (separation of the B‑flange) and its exclusion for certain repairs creates interpretive risk about when the AD becomes applicable (Compliance)."],"plain_english_summary":"Requires operators of specified Pratt & Whitney JT9D turbofan engines with steel fan cases to replace a one‑piece fan‑case shield with a four‑piece shield and install four supports, performed per the manufacturer’s service bulletins. The work must be done at the next in‑shop B‑flange separation (as defined) or by 31 December 2012.\n\nThis directive primarily affects aircraft operators and maintenance organisations, who bear parts, labour and downtime costs and must follow the technical service instructions to comply."},"kimi_summary":{"content_quality":"ok","complexity_score":3,"scope_assessment":{"changed":false,"description":"This is a standard, targeted Airworthiness Directive addressing a specific unsafe condition in a defined set of engines. The scope remains tightly focused on the fan case shield replacement requirement without expansion into unrelated areas."},"complexity_factors":["Multiple applicability categories based on engine model and service bulletin incorporation status (6 distinct engine models with 3 different compliance paths)","Technical terminology requiring aviation engineering knowledge (B-flange, shop visit, fan case shield, service bulletins)","Cross-references to external manufacturer documents (Pratt & Whitney Service Bulletins 72-312, 72-88, 72-311, 72-583, 72-584)","Conditional definitions (specific exclusion that rub strip repairs don't constitute a shop visit)","Reference to corresponding FAA directive (AD 2004-01-08) for additional context"],"plain_english_summary":"This mandatory CASA Airworthiness Directive requires owners/operators of Pratt & Whitney JT9D-7R4 series turbofan engines with steel fan cases (installed on Airbus A300/A310 and Boeing 747/767) to replace the one-piece fan case shield with a four-piece shield and fit four support brackets.  \n\nIssued to correct an unsafe fan-case design, the work must be done at the next shop visit (B‑flange separation) and no later than 31 December 2012; the AD took effect 15 April 2004."}},"importantCases":[],"_links":{"self":"/api/acts/ad-jt9d-39-one-piece-fan-case-shield","history":"/api/acts/ad-jt9d-39-one-piece-fan-case-shield/history","analysis":"/api/acts/ad-jt9d-39-one-piece-fan-case-shield/analysis","conflicts":"/api/acts/ad-jt9d-39-one-piece-fan-case-shield/conflicts","importantCases":"/api/acts/ad-jt9d-39-one-piece-fan-case-shield/important-cases","documents":"/api/acts/ad-jt9d-39-one-piece-fan-case-shield/documents"}}