{"id":"F2005L01362","name":"AD/CFM56/7 Amdt 4 - Fan Disk Inspection","slug":"ad-cfm56-7-amdt-4-fan-disk-inspection","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":35180,"registerId":"commonwealth-F2005L01362-current","compilationNumber":null,"startDate":"2026-04-01","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"CFM International Turbine Engines - CFM5","sectionType":"division","heading":"CFM International Turbine Engines - CFM56 Series","content":"### CFM International Turbine Engines - CFM56 Series\n\n| AD/CFM56/7 Amdt 4 | Fan Disk Inspection | 7/2005 |\n| ----------------- | ------------------- | ------ |\n\n| Applicability: | CFM56-3B-1, CFM56-3B-2 and CFM56-3C-1 turbofan engines.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           |\n| -------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n| Requirement:   | Use of ZIP D5460 NS and ZIP D5460 products to lubricate fan blades is no longer allowed.Perform an inspection of the fan disk in accordance with CFM56-3/-3B/-3C Service Bulletin (SB) 72-0854 Revision 5.Report the results of the inspection to CFM International.Note: DGAC AD 1997-298R4 EASA approval No. 2005-1915 dated 22 February 2005 refers.                                                                                                                                                                                                                                                                                           |\n| Compliance:    | From the effective date of this Directive.In accordance with the compliance periods detailed in CFM56-3/-3B/-3CSB 72-0854 Revision 5.No later than 30 days after the completion of the inspection.                                                                                                                                                                                                                                                                                                                                                                                                                                                |\n|                | This Amendment becomes effective on 7 July 2005.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  |\n| Background:    | Engine test results and theoretical analysis have shown there is a likelihood of heavy wear on fan disk dovetail pressure faces. This Directive specifies a one time, on-wing inspection to identify worn fan disks and carry out rectifying maintenance to return worn disks to service.Amendment 4 is raised to detail the latest revision of manufacturers SB and DGAC Airworthiness Directive.Amendment 3 of this Airworthiness Directive became effective on 10 August 2000.Amendment 2 of this Airworthiness Directive became effective on 5 November 1998.Amendment 1 of this Airworthiness Directive became effective on 29 January 1998. |\n\n|     | The original issue of this Airworthiness Directive became effective on 1 January 1998. |\n| --- | -------------------------------------------------------------------------------------- |\n\n![](image.001.png)  \nJames Coyne  \nDelegate of the Civil Aviation Safety Authority\n\n27 May 2005","sortOrder":0},{"sectionNumber":"AD/CFM56/7 Amdt 4","sectionType":"part","heading":"AD/CFM56/7 Amdt 4","content":"## AD/CFM56/7 Amdt 4","sortOrder":1},{"sectionNumber":"Fan Disk Inspection","sectionType":"part","heading":"Fan Disk Inspection","content":"## Fan Disk Inspection","sortOrder":2},{"sectionNumber":"7/2005","sectionType":"part","heading":"7/2005","content":"## 7/2005","sortOrder":3}],"analysis":{"flash_summary":{"complexity_score":4,"scope_assessment":{"changed":false,"description":"Amendment 4 updates the directive to reference the latest manufacturer Service Bulletin (SB 72-0854 Revision 5) and reiterates the ban on ZIP D5460 lubricants, while keeping the original one‑time on‑wing inspection and rectification requirement intended to identify dovetail wear (Background/Requirement). It refines procedural references and reporting requirements but does not widen the class of affected engines or introduce new types of actions beyond inspection, repair, prohibition of a lubricant, and reporting (Applicability/Requirement/Compliance)."},"complexity_factors":["Narrow technical scope: Applies only to CFM56-3B-1, -3B-2 and -3C-1 engines (Applicability). This limits affected parties and simplifies compliance.","External procedural reference: Mandates inspection “in accordance with CFM56-3/-3B/-3C Service Bulletin (SB) 72-0854 Revision 5” (Requirement). Compliance requires access to and following a separate, technical SB.","Prohibition plus remedial action: Bans ZIP D5460 NS and ZIP D5460 lubricants for fan blade lubrication and requires rectifying maintenance for worn disks (Requirement/Background). Operators bear replacement/repair costs and operational downtime.","Reporting obligation: Requires operators to report inspection results to CFM International within 30 days of inspection completion (Compliance). This adds an administrative burden and information flow to the manufacturer.","Single-event timing with staged deadlines: One-time on-wing inspection required from the directive’s effective date, and compliance must follow periods in the SB (Compliance). Scheduling inspections across fleets can create logistical complexity.","Regulatory cross-reference: Notes DGAC AD and EASA approval references (Requirement/Background). This can affect international operators and indicates alignment with other authorities.","Prescriptive, low-discretion enforcement: The directive prescribes specific actions and timing (Requirement/Compliance), leaving little operator discretion about method or reporting, but relying on the SB for technical detail."],"plain_english_summary":"This directive affects operators of CFM56-3B-1, -3B-2 and -3C-1 turbofan engines. It bans use of ZIP D5460 lubricants on fan blades, requires a one‑time on‑wing inspection of the fan disk following CFM56 SB 72‑0854 Revision 5, mandates reporting the results to CFM International, and requires rectifying maintenance where wear is found. It matters because it identifies and fixes dovetail wear that could affect engine safety and continued airworthiness."},"kimi_summary":{"content_quality":"ok","complexity_score":3,"scope_assessment":{"changed":false,"description":"This is Amendment 4 of an existing Airworthiness Directive. The amendments have consistently maintained the same core purpose: addressing fan disk wear on specific CFM56 engines. Amendment 4 simply updates the reference to the latest manufacturer service bulletin revision and clarifies the banned lubricant products. The scope has remained tightly focused on the original safety issue since the original issue in January 1998."},"complexity_factors":["Short, single-purpose directive with one main requirement (fan disk inspection)","Only 3 specific engine models affected (narrow applicability)","References external technical document (Service Bulletin 72-0854 Revision 5) without reproducing its contents","Simple compliance structure: one-time inspection with 30-day reporting deadline","No nested exceptions, conditional logic, or extensive defined terms","Cross-references to French (DGAC) and European (EASA) aviation authorities for background context only"],"plain_english_summary":"This is an **Airworthiness Directive (AD)** — a mandatory safety order issued by Australia's Civil Aviation Safety Authority (CASA) that requires specific maintenance actions on aircraft engines.\n\n**What it does:**\n- **Bans** the use of two specific lubricant products (ZIP D5460 NS and ZIP D5460) on fan blades of certain jet engines.\n- **Requires** a one-time physical inspection of the \"fan disk\" (the central hub that holds the fan blades) on specific CFM56 engine models to check for dangerous wear.\n- **Mandates** that inspection results be reported to the engine manufacturer, CFM International.\n\n**Who it affects:**\n- Owners and operators of aircraft with **CFM56-3B-1, CFM56-3B-2, and CFM56-3C-1** turbofan engines (commonly used on Boeing 737 Classic series aircraft).\n- Maintenance organisations servicing these engines.\n\n**Why it matters:**\nEngine testing revealed that the fan disk can suffer \"heavy wear\" at the points where blades connect (called \"dovetail pressure faces\"). This wear could potentially lead to engine failure or blade separation — a serious flight safety risk. The directive forces operators to check for this problem and fix it before it becomes dangerous.\n\n**Key deadlines:**\n- The inspection must follow the timeline in the manufacturer's Service Bulletin 72-0854 Revision 5.\n- Results must be reported within 30 days of completing the inspection."},"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"}},"importantCases":[],"_links":{"self":"/api/acts/ad-cfm56-7-amdt-4-fan-disk-inspection","history":"/api/acts/ad-cfm56-7-amdt-4-fan-disk-inspection/history","analysis":"/api/acts/ad-cfm56-7-amdt-4-fan-disk-inspection/analysis","conflicts":"/api/acts/ad-cfm56-7-amdt-4-fan-disk-inspection/conflicts","importantCases":"/api/acts/ad-cfm56-7-amdt-4-fan-disk-inspection/important-cases","documents":"/api/acts/ad-cfm56-7-amdt-4-fan-disk-inspection/documents"}}