{"id":"F2012L01699","name":"AD/TRENT 700/1 - Engine - IP Turbine Bearing Oil Vent & Scavenge Tube","slug":"ad-trent-700-1-engine-ip-turbine-bearing-oil-vent-scavenge-tube","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":89662,"registerId":"commonwealth-F2012L01699-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"Rolls Royce Turbine Engines - RB211 TREN","sectionType":"division","heading":"Rolls Royce Turbine Engines - RB211 TRENT 700 Series","content":"### Rolls Royce Turbine Engines \\- RB211 TRENT 700 Series\n\n| AD/TRENT 700/1 | Engine - IP Turbine BearingOil Vent & Scavenge Tube | 17/2012 |\n| -------------- | --------------------------------------------------- | ------- |\n\n| Applicability: | RB211 Trent 700 series engines identified in EASA AD 2009-0069 except when previously modified in accordance with Rolls-Royce Service Bulletins 72-E708,72-E965 or 72-F227.                                                                |\n| -------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ |\n| Requirement:   | Perform periodic inspections specified in sections (1) and (2) of EASA AD2009-0069. Carry out terminating action specified in section (3) of EASA AD2009-0069.Note: Rolls-Royce Service Bulletin 72-AE792 Rev 4 refers.                    |\n| Compliance:    | Periodic inspections must be performed at intervals specified in EASA AD2009-0069. Terminating action must be completed before the first flight after the next 05 module overhaul, but not later than 31 May 2014, whichever occurs first. |\n|                | This Airworthiness Directive becomes effective on 20 August 2012.                                                                                                                                                                          |\n| Background:    | CASA has reviewed state-of-design ADs applicable to Trent 700 engines and decided EASA AD 2009-0069 should be explicitly mandated for applicable engines in Australian aircraft.                                                           |\n\n![](image.001.png)\n\nMike Higgins  \nDelegate of the Civil Aviation Safety Authority\n\n14 August 2012","sortOrder":0},{"sectionNumber":"AD/TRENT 700/1","sectionType":"part","heading":"AD/TRENT 700/1","content":"## AD/TRENT 700/1","sortOrder":1},{"sectionNumber":"Engine - IP Turbine BearingOil Vent & Sc","sectionType":"part","heading":"Engine - IP Turbine BearingOil Vent & Scavenge Tube","content":"## Engine \\- IP Turbine Bearing  \nOil Vent & Scavenge Tube","sortOrder":2},{"sectionNumber":"17/2012","sectionType":"part","heading":"17/2012","content":"## 17/2012","sortOrder":3}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":3,"scope_assessment":{"changed":false,"description":"This instrument maintains its original narrow scope. It is a standard airworthiness directive adopting a specific European safety requirement for a specific engine model. There is no evidence of scope creep; it addresses exactly what it purports to address (oil vent and scavenge tube inspections) without expanding into unrelated operational or maintenance areas."},"complexity_factors":["Short, single-purpose instrument (approximately 250 words)","Only 3 defined/modified terms requiring external reference (EASA AD 2009-0069, three Rolls-Royce Service Bulletins)","Simple conditional structure: applicability exception + two compliance deadlines","No nested exceptions or recursive definitions","Heavy reliance on incorporated external documents (EASA AD and Rolls-Royce bulletins) — the actual technical requirements are not reproduced in the instrument itself","Clear, standardised AD format with distinct Applicability/Requirement/Compliance/Background sections"],"plain_english_summary":"This CASA Airworthiness Directive mandates periodic inspections of the intermediate-pressure turbine bearing oil vent and scavenge tube on Rolls‑Royce RB211 Trent 700 engines (A330) and requires a terminating modification by the earlier of the next major overhaul or 31 May 2014.  \n\nIt affects Australian operators and maintenance organisations, adopts the corresponding EASA safety action, and is legally binding to prevent oil‑system faults that could cause engine damage or failure."},"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":true,"description":"The Directive explicitly mandates EASA AD 2009-0069 for applicable RB211 Trent 700 engines on Australian aircraft, thereby bringing the state-of-design AD into Australian regulatory effect. It excludes engines already modified per specified Rolls‑Royce service bulletins and does not add separate technical requirements beyond those in the referenced EASA AD."},"complexity_factors":["Cross-reference to EASA AD 2009-0069 for both inspection procedures and terminating action (Requirement section) — requires operators to consult an external instrument for technical detail.","Applicability carve-outs for engines modified per Rolls‑Royce SBs 72-E708, 72-E965 or 72-F227 — operators must check engine modification history to determine coverage (Applicability).","Compliance timing tied to maintenance events (first flight after next 05 module overhaul) or a hard calendar date (31 May 2014) — affects maintenance planning and scheduling (Compliance).","Reference to additional Rolls‑Royce Service Bulletin 72-AE792 Rev 4 — creates another documentary cross-reference for implementers (Requirement/Note).","Regulatory action is an adoption of a state-of-design AD into domestic law (Background) — legal effect is straightforward but administratively requires record updates and demonstrable compliance."],"plain_english_summary":"This Airworthiness Directive requires operators of RB211 Trent 700 engines (those identified in EASA AD 2009-0069, except engines previously modified by Rolls‑Royce SBs 72‑E708, 72‑E965 or 72‑F227) to perform periodic inspections of the IP turbine bearing oil vent and scavenge tube and to carry out the terminating modification set out in EASA AD 2009-0069. Inspections follow the intervals in the EASA AD; the terminating action must be completed by the first flight after the next 05 module overhaul or by 31 May 2014, whichever is earlier."}},"importantCases":[],"_links":{"self":"/api/acts/ad-trent-700-1-engine-ip-turbine-bearing-oil-vent-scavenge-tube","history":"/api/acts/ad-trent-700-1-engine-ip-turbine-bearing-oil-vent-scavenge-tube/history","analysis":"/api/acts/ad-trent-700-1-engine-ip-turbine-bearing-oil-vent-scavenge-tube/analysis","conflicts":"/api/acts/ad-trent-700-1-engine-ip-turbine-bearing-oil-vent-scavenge-tube/conflicts","importantCases":"/api/acts/ad-trent-700-1-engine-ip-turbine-bearing-oil-vent-scavenge-tube/important-cases","documents":"/api/acts/ad-trent-700-1-engine-ip-turbine-bearing-oil-vent-scavenge-tube/documents"}}