{"id":"F2005L01064","name":"AD/BR700/3 Amdt 1 - LP Compressor Fan Disc Cracks","slug":"ad-br700-3-amdt-1-lp-compressor-fan-disc-cracks","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":34681,"registerId":"commonwealth-F2005L01064-current","compilationNumber":null,"startDate":"2026-04-01","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"Rolls Royce Germany Turbine Engines - BR","sectionType":"division","heading":"Rolls Royce Germany Turbine Engines - BR700 Series","content":"### Rolls Royce Germany Turbine Engines - BR700 Series\n\n| AD/BR700/3 Amdt 1 | LP Compressor Fan Disc Cracks | 6/2005 |\n| ----------------- | ----------------------------- | ------ |\n\n| Applicability: | Rolls Royce BR700-710A1-10 and BR700-710A2-20 engines. |\n| -------------- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n| Requirement: | 1. Inspect the fan disc using the visual and/or ultrasonic methods in accordance with Rolls Royce Service Bulletin (S/B) SB-BR700-72-900229 Revision 6.2. Inspect the fan disc using both the ultrasonic and visual method in accordance with Rolls Royce S/B SB-BR700-72-900229 Revision 6.Terminating ActionInstallation of a changed design fan disc in accordance with S/B-BR700-72-900229 Rev 6 constitutes terminating action to this Directive.Note: LBA AD 2000-348R6, approved by EASA Approval No 2005-2313 dated 11 March 2005 refers. |\n| Compliance: | For Requirement 1:For Fan Discs Part Number (P/N) BRR18803 and P/N BRR19248:For engines with discs that have already shown compliance with Revision 3 or later of the reference document that used the visual technique; within 25 flight cycles from the effective date of this Directive and thereafter at intervals of 25 flight cycles from the previous inspection until an ultrasonic inspection is carried out, at which time the interval can increase to 75 flight cycles after the first repeat inspection.For engines with discs that have already shown compliance with Revision 3 or later of the reference document that used the ultrasonic technique; within 75 flight cycles from the effective date of this Directive and thereafter at intervals of 75 flight cycles.For Fan Discs P/N BRR20791 installed in Engine Serial Numbers (S/N) prior to 11453(GV) and 12353(GX):For engines with discs that have already shown compliance with Revision 3 or later of the reference document that used the visual technique; within 25 flight cycles from the effective date of this Directive and thereafter at intervals of 25 flight cycles from the previous inspection until an ultrasonic inspection is carried out, at which time the interval can increase to 150 flight cycles after the first repeat inspection. |\n| | For engines with discs that have already shown compliance with Revision 3 or later of the reference document that used the ultrasonic technique; within 150 flight cycles from the effective date of this Directive and thereafter at intervals of 150 flight cycles.For Fan Discs P/N BRR20791 installed in Engine S/N 11453(GV), S/N 12353(GX) and all subsequent engines, and P/N BRR20791 fan discs held as spares with a JAA form certificate dated on or after 1 January 2002:Initial inspection within 150 flight cycles since new.For Fan Discs P/N BRR20791 held as spares with a JAA Form One certificate date on or after 1 January 2002:Initial inspection within 150 flight cycles since new.For Requirement 2:For all Fan Discs:At each “A” check. |\n| | This Amendment becomes effective on 9 June 2005. |\n| Background: | In service experience from the BR700-710 engine fleet has shown the possibility of fan disc cracks. Fan disc cracks can result in severe damage to the engine and potential hazard to the aircraft.This amendment provides updates to the reference document and terminating action to the requirements by fitment of a new designed fan disc.The original issue of this Directive became effective 2 October 2003. |\n\n![](image.001.png) \nJames Coyne \nDelegate of the Civil Aviation Safety Authority\n\n28 April 2005","sortOrder":0},{"sectionNumber":"AD/BR700/3 Amdt 1","sectionType":"part","heading":"AD/BR700/3 Amdt 1","content":"## AD/BR700/3 Amdt 1","sortOrder":1},{"sectionNumber":"LP Compressor Fan Disc Cracks","sectionType":"part","heading":"LP Compressor Fan Disc Cracks","content":"## LP Compressor Fan Disc Cracks","sortOrder":2},{"sectionNumber":"6/2005","sectionType":"part","heading":"6/2005","content":"## 6/2005","sortOrder":3}],"analysis":{"flash_summary":{"complexity_score":6,"scope_assessment":{"changed":false,"description":"This amendment does not expand the subject matter beyond the original directive’s purpose of addressing fan disc cracking risk. It updates and clarifies inspection methods and intervals (by referencing a later Service Bulletin revision and by specifying ultrasonic versus visual protocols), adds a clear terminating action (fit changed‑design disc), and refines applicability by part and serial number and by spare certification date. Those are refinements to implementation and compliance mechanics rather than a material broadening of scope beyond the original safety objective (detecting or eliminating fan disc cracks)."},"complexity_factors":["Multiple conditional inspection intervals (25, 75, 150 flight cycles) depending on part number, serial number range, and prior inspection technique","Different requirements for three fan disc part numbers (BRR18803, BRR19248, BRR20791)","Additional carve‑outs for specific engine serial numbers (e.g. S/N prior to 11453(GV) and 12353(GX) and specified S/Ns and subsequent engines)","Dependency on which revision of the Rolls‑Royce Service Bulletin was previously used (references to Revision 3 and later)","Distinction between visual and ultrasonic inspection methods, and different follow‑up intervals depending on which was used","Special rules for spares linked to JAA Form One certificate dates (impacting inventory/spare parts compliance)","Cross‑reference to an external manufacturer Service Bulletin (SB‑BR700‑72‑900229 Rev 6.2) and to a foreign airworthiness authority document (LBA AD 2000‑348R6 / EASA approval)","Terminating action option (fit changed design fan disc) that alters long‑term compliance obligations","Operational tie‑in to routine maintenance schedule (‘‘A’’ checks) creating interaction with operators' maintenance planning"],"plain_english_summary":"This directive mandates recurring visual and ultrasonic inspections of the low‑pressure compressor fan disc on Rolls‑Royce BR700‑710A1‑10 and A2‑20 engines (per the referenced Rolls‑Royce service bulletin) and allows a terminating action by fitting a redesigned fan disc. \n\nIt affects aircraft operators, maintenance shops, and parts/overhaul suppliers; it aims to detect or eliminate fan‑disc cracking risk but increases inspection workload and costs unless operators choose the redesigned‑disc replacement."},"kimi_summary":{"content_quality":"ok","complexity_score":6,"scope_assessment":{"changed":false,"description":"This is an amendment (Amendment 1) to an existing Airworthiness Directive. The scope remains tightly focused on the original safety issue (LP compressor fan disc cracks in BR700-710 engines). The amendment updates the reference document to Revision 6 and adds terminating action (redesigned fan disc installation), but does not expand beyond the original engine models or safety concern. The original directive became effective 2 October 2003; this amendment refines rather than broadens the regulatory scope."},"complexity_factors":["Multiple part numbers (P/N BRR18803, BRR19248, BRR20791) with distinct compliance schedules","Nested conditional logic: inspection intervals depend on (a) part number, (b) previous compliance method used (visual vs ultrasonic), (c) engine serial number thresholds (11453/12353), and (d) whether disc is installed or spare","Variable inspection intervals ranging from 25 to 150 flight cycles with escalation pathways (25→75 or 25→150 cycles)","Cross-reference to external technical document (Rolls-Royce Service Bulletin SB-BR700-72-900229 Rev 6) which is not reproduced in the directive","Reference to foreign aviation authority documentation (LBA AD 2000-348R6, EASA Approval No 2005-2313) creating dependency on international regulatory context","Terminating action clause that requires specific hardware modification to cease ongoing obligations","Dense tabular formatting with fragmented compliance section requiring careful parsing to extract complete requirements for each scenario"],"plain_english_summary":"**What this is:** This is an **Airworthiness Directive (AD)** — a mandatory safety order issued by Australia's Civil Aviation Safety Authority (CASA). It requires owners and operators of specific Rolls-Royce aircraft engines to inspect for dangerous cracks in a critical engine component.\n\n**Who it affects:** Anyone operating aircraft with **Rolls-Royce BR700-710A1-10 or BR700-710A2-20 engines** — specifically the **low-pressure (LP) compressor fan discs** (the large rotating disc at the front of the engine that draws in air).\n\n**What it requires:**\n- **Inspections:** Operators must visually and/or ultrasonically inspect fan discs for cracks following specific Rolls-Royce technical instructions (Service Bulletin SB-BR700-72-900229, Revision 6).\n- **Different rules for different parts:** The inspection schedule varies depending on:\n - Which **part number** your fan disc has (BRR18803, BRR19248, or BRR20791)\n - Which **inspection method** was used previously (visual or ultrasonic)\n - Which **engine serial number** you have (older vs newer engines)\n - Whether the disc is **already installed** or held as a **spare part**\n- **Repeat inspections:** Some discs need checking every 25 flight cycles (takeoff-to-landing), others every 75 or 150 cycles.\n- **Terminating action:** You can stop these repeated inspections permanently if you install a redesigned fan disc (also covered by the same Service Bulletin).\n\n**Why it matters:** Cracks in fan discs can cause **catastrophic engine failure** and potentially endanger the aircraft and passengers. This directive prevents accidents by catching cracks before they cause failure. The amendment updates inspection methods and provides a permanent fix option (the redesigned disc).\n\n**Key dates:** The directive took effect on **9 June 2005**."},"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-br700-3-amdt-1-lp-compressor-fan-disc-cracks","history":"/api/acts/ad-br700-3-amdt-1-lp-compressor-fan-disc-cracks/history","analysis":"/api/acts/ad-br700-3-amdt-1-lp-compressor-fan-disc-cracks/analysis","conflicts":"/api/acts/ad-br700-3-amdt-1-lp-compressor-fan-disc-cracks/conflicts","importantCases":"/api/acts/ad-br700-3-amdt-1-lp-compressor-fan-disc-cracks/important-cases","documents":"/api/acts/ad-br700-3-amdt-1-lp-compressor-fan-disc-cracks/documents"}}