{"id":"F2006B07409","name":"AD/TFE 731/32 - Fan Rotor Disc","slug":"ad-tfe-731-32-fan-rotor-disc","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":49636,"registerId":"commonwealth-F2006B07409-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"AIRWORTHINESS DIRECTIVE","sectionType":"part","heading":"AIRWORTHINESS DIRECTIVE","content":"# ![](image.001.png)![](image.001.png)AIRWORTHINESS DIRECTIVE\n\n![](image.001.png)For 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 CAR 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\nAlliedSignal (Garrett/AiResearch) Turbine Engines \\- TFE 731 Series","sortOrder":0},{"sectionNumber":"AD/TFE 731/32 Fan Rotor Disc 4/2002","sectionType":"part","heading":"AD/TFE 731/32 Fan Rotor Disc 4/2002","content":"# AD/TFE 731/32 Fan Rotor Disc 4/2002\n\nApplicability: TFE731 -2, -3, and -4 series turbofan engines with fan rotor discs part numbers (P/N’s) 3072162 \\-All, 3072816 \\-All, 3073436 \\-All, 3073539-All and 3074529 \\-All.\n\n(where All denotes all dash numbers).\n\nRequirement: Replace applicable fan rotor discs in accordance with Honeywell SB TFE731-A72- 3668.\n\nNote 1: FAA AD 2001-23-09 refers.\n\nNote 2: As of 31 December 2002 applicable fan rotor discs will be obsolete. As of that date, the requirements of AD/731/12, AD/731/19, AD/731/21, AD/731/27, AD/731/28, and AD/731/30 will be cancelled.\n\nCompliance: Effective 18 April 2002:\n\n    At next access to fan rotor disc; or\n\n    2. At next scheduled inspection of the fan rotor disc; or\n\n    3. Prior to 31 December 2002, whichever occurs earliest.\n\nNote 3: Access to the fan rotor disc is defined as whenever the fan shaft is unstretched.\n\nNote 4: Serviceable discs are those part numbers not listed in this Directive.\n\nThis Airworthiness Directive becomes effective on the 18 April 2002.","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":4,"scope_assessment":{"changed":false,"description":"The AD maintains the original scope of mandating replacement of the listed fan rotor discs on specified TFE731 engine models. It adds a firm obsolescence date (31 December 2002) and cancels several prior ADs as of that date, but does not expand applicability beyond the engines and part numbers listed in the Applicability section."},"complexity_factors":["Specific applicability by engine series and multiple part numbers creates narrow technical targeting (Applicability).","Mandatory compliance tied to an external service bulletin (Honeywell SB TFE731-A72-3668) requires operators to follow manufacturer instructions (Requirement).","Three alternative compliance triggers (next access, next scheduled inspection, or prior to 31 Dec 2002) add operational timing complexity (Compliance).","Definitions and notes affect interpretation: 'access' defined as whenever the fan shaft is unstretched (Note 3); 'serviceable' discs defined by omission from the list (Note 4).","Cross-reference to FAA AD 2001-23-09 and the manufacturer SB requires coordination with external regulatory and technical documents (Note 1, Requirement).","Obsolescence date and automatic cancellation of multiple earlier ADs changes the regulatory landscape on a fixed timetable (Note 2).","Short effective date (18 April 2002) creates a compressed compliance window for some operators (Compliance: Effective 18 April 2002)."],"plain_english_summary":"Requires replacement of specified fan rotor discs on Honeywell/AlliedSignal TFE731 -2, -3 and -4 turbofan engines, in accordance with Honeywell SB TFE731-A72-3668, at the next fan-disc access, at the next scheduled inspection, or before 31 December 2002. It affects aircraft operators and maintenance providers, who must supply parts, labour and scheduling to meet the deadline. CASA issues the AD to correct an identified unsafe condition and it references FAA AD 2001-23-09; as of 31 December 2002 the listed discs become obsolete and several earlier ADs are cancelled."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This AD maintains its original narrow scope — addressing a specific safety defect in specific engine part numbers. The cancellation of six older ADs at the end of 2002 is a planned housekeeping measure, not scope creep."},"complexity_factors":["Single, specific mechanical component targeted (fan rotor disc)","Only 5 part numbers affected, clearly listed","Straightforward compliance timeline with three alternative triggers (next access, next inspection, or fixed date)","Minimal cross-referencing (one FAA AD mentioned in a note, one Honeywell service bulletin)","No nested exceptions or conditional logic","Short document (approximately 250 words)","Only one defined term ('access to fan rotor disc' — defined simply as when fan shaft is unstretched)"],"plain_english_summary":"This AD requires replacement of specified AlliedSignal/Honeywell TFE731-2, -3 and -4 fan rotor discs (listed by part number) to address an unsafe, becoming-obsolete disc condition that could cause catastrophic engine failure. \n\nIt affects operators of affected business jets and mandates replacement per Honeywell SB TFE731-A72-3668 at the next engine opening or inspection, or by 31 December 2002; compliance also cancels six earlier directives."}},"importantCases":[],"_links":{"self":"/api/acts/ad-tfe-731-32-fan-rotor-disc","history":"/api/acts/ad-tfe-731-32-fan-rotor-disc/history","analysis":"/api/acts/ad-tfe-731-32-fan-rotor-disc/analysis","conflicts":"/api/acts/ad-tfe-731-32-fan-rotor-disc/conflicts","importantCases":"/api/acts/ad-tfe-731-32-fan-rotor-disc/important-cases","documents":"/api/acts/ad-tfe-731-32-fan-rotor-disc/documents"}}