{"id":"F2006B04814","name":"AD/BR700/2 - Oil Filter Differential Switch","slug":"ad-br700-2-oil-filter-differential-switch","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":44611,"registerId":"commonwealth-F2006B04814-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)  \nAIRWORTHINESS DIRECTIVE\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\nRolls Royce Germany Turbine Engines \\- BR700 Series","sortOrder":0},{"sectionNumber":"AD/BR700/2 Oil Filter Differential Switc","sectionType":"part","heading":"AD/BR700/2 Oil Filter Differential Switch 5/2003","content":"# AD/BR700/2 Oil Filter Differential Switch 5/2003\n\nApplicability: Rolls Royce BR700-710A1-10 and BR700-710A2-20 series engines with oil filter differential pressure switch part number (P/N) 21SN04-419 or \\-431 fitted:\n\n    For BR700-710A1-10 engines with serial numbers (S/N) up to and including 11336.\n\n    b. For BR700-710A2-20 engines with S/N up to and including 12259.\n\nNote 1: These engines are installed on, but, not limited to Bombardier BD-700-1A10 and Gulfstream V aeroplanes.\n\nRequirement: 1. Inspect the oil filter differential pressure switch to determine its serial number.\n\n    If the oil filter differential pressure switch is listed in Appendix 1 of Rolls- Royce Service Bulletin (S/B) BR700-79-900215 Revision 2, mark the switch in accordance with step (C) of Part 1, Accomplishment Instructions of Rolls- Royce S/B BR700-79-900215 Revision 2.\n\n    b. If the oil filter differential pressure switch is not listed in Appendix 1 of Rolls-Royce S/B BR700-79-900215 Revision 2, comply with Requirement 2 of this Directive.\n\n2. Replace the oil filter differential switch in accordance with Part 2 of the Accomplishment Instructions of Rolls-Royce S/B BR700-79-900215 Revision 2.\n\nNote 2: LBA AD 2000-257/2 refers.\n\nCompliance: 1. Within 50 flight hours from the effective date of this Directive.\n\n2. a. For oil filter differential switches with less than 200 flight hours time since new (TSN), within 50 flight hours from the effective date of this Directive.\n\nb. For oil filter differential switches with more than 200 flight hours TSN, within 150 flight hours from the effective date of this Directive.\n\nThis Airworthiness Directive becomes effective on 15 May 2003.","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 explicitly limits applicability to BR700‑710A1‑10 and BR700‑710A2‑20 engines with oil filter differential pressure switch P/N 21SN04‑419 or ‑431 and specific serial number ranges. The text contains no statement that expands or reduces that applicability from a prior scope; it references a related LBA AD but does not indicate a change in scope."},"complexity_factors":["Clear, limited applicability to two engine models and two specific switch part numbers (Applicability).","Dependency on an external document: Rolls‑Royce Service Bulletin BR700‑79‑900215 Revision 2 is required to determine marking or replacement actions (Requirement).","Two-step decision process: inspect serial number then either mark (if listed in Appendix 1) or replace (Requirement 1–2).","Variable compliance windows tied to time‑since‑new (TSN) of the switch: different flight‑hour limits apply (Compliance 2a–2b).","Short, operational deadlines (within 50–150 flight hours) create scheduling and logistic constraints (Compliance).","Cross‑reference to a foreign AD (LBA AD 2000‑257/2) introduces potential coordination or interpretation needs (Note 2)."],"plain_english_summary":"This Airworthiness Directive requires operators of Rolls‑Royce BR700‑710A1‑10 and BR700‑710A2‑20 engines fitted with oil‑filter differential pressure switch P/N 21SN04‑419 or ‑431 to inspect the switch serial number and then either mark the unit or replace it following Rolls‑Royce Service Bulletin BR700‑79‑900215 Rev 2. Deadlines depend on the switch’s time‑since‑new. It affects aircraft operators and maintenance organisations who must carry out inspections, marking or replacement and bear the associated parts and labour costs."},"kimi_summary":{"content_quality":"ok","complexity_score":3,"scope_assessment":{"changed":false,"description":"This is a standard, narrow Airworthiness Directive addressing a specific unsafe condition in specific engine models. It has not expanded beyond its original safety purpose."},"complexity_factors":["Short, single-purpose directive focused on one specific mechanical component","Clear conditional logic (if listed in Appendix 1 → mark; if not listed → replace)","Only 2 main requirements with straightforward compliance timeframes","References external technical documents (Rolls-Royce Service Bulletin) but provides specific part numbers and serial number ranges for clarity","No nested definitions or extensive interpretation sections","Limited applicability scope (two specific engine models with specific serial number cutoffs)"],"plain_english_summary":"This safety order requires operators and maintainers of business jets with Rolls‑Royce BR700 engines (A1‑10 serials up to 11336; A2‑20 up to 12259) to inspect the oil filter differential pressure switch’s serial number and either mark units on a specified list or replace units not listed. \n\nIt addresses an unsafe condition in the oil-pressure switching that could risk engine oil system failure or fire and imposes short compliance deadlines, reflecting urgent safety concern."}},"importantCases":[],"_links":{"self":"/api/acts/ad-br700-2-oil-filter-differential-switch","history":"/api/acts/ad-br700-2-oil-filter-differential-switch/history","analysis":"/api/acts/ad-br700-2-oil-filter-differential-switch/analysis","conflicts":"/api/acts/ad-br700-2-oil-filter-differential-switch/conflicts","importantCases":"/api/acts/ad-br700-2-oil-filter-differential-switch/important-cases","documents":"/api/acts/ad-br700-2-oil-filter-differential-switch/documents"}}