{"id":"F2012L01702","name":"AD/TRENT 700/4 - Engine - IP Compressor Shaft - Inspection","slug":"ad-trent-700-4-engine-ip-compressor-shaft-inspection","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":89673,"registerId":"commonwealth-F2012L01702-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 700/4 | Engine - IP Compressor Shaft - Inspection | 17/2012 |\n| -------------- | ----------------------------------------- | ------- |\n\n| Applicability: | RB211 Trent 700 series engines identified in EASA AD 2007-0136.                                                                                                                        |\n| -------------- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n| Requirement:   | Inspect the IP compressor drum as specified in EASA AD 2007-0136 Rev 1 or later revision.Note: Rolls-Royce Service Bulletins RB211-72-AF197 Rev 1 and 72-AE753 Rev 2 refer.            |\n| Compliance:    | Periodic inspections must be performed at intervals specified in EASA AD 2007-0136 Rev 1 or later revision.                                                                            |\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 2007-0136 Rev 1 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 700/4","sectionType":"part","heading":"AD/TRENT 700/4","content":"## AD/TRENT 700/4","sortOrder":1},{"sectionNumber":"Engine - IP Compressor Shaft - Inspectio","sectionType":"part","heading":"Engine - IP Compressor Shaft - Inspection","content":"## Engine \\- IP Compressor Shaft - Inspection","sortOrder":2},{"sectionNumber":"17/2012","sectionType":"part","heading":"17/2012","content":"## 17/2012","sortOrder":3}],"analysis":{"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"CASA decided to explicitly mandate EASA AD 2007-0136 Rev 1 for the specified RB211 Trent 700 engines rather than introduce new or broader requirements. The AD adopts the applicability and inspection regime identified in the EASA AD and refers to Rolls‑Royce service bulletins, so it preserves the original scope described in the background."},"complexity_factors":["Direct reliance on an external instrument (EASA AD 2007-0136 Rev 1) rather than self-contained technical requirements","Cross-references to manufacturer service bulletins for inspection procedures (RB211-72-AF197 Rev 1 and 72-AE753 Rev 2)","Technical nature of required inspections (IP compressor drum/shaft) requiring specialist maintenance skills and possible teardown","Ongoing periodic compliance obligations (recurring intervals) that interact with operators' maintenance schedules","Operational impact uncertainty (downtime and repair costs depend on inspection findings) creating variable compliance burden"],"plain_english_summary":"This Airworthiness Directive requires inspections of the intermediate-pressure (IP) compressor drum/shaft on Rolls‑Royce RB211 Trent 700 engines by mandating compliance with EASA AD 2007-0136 Rev 1 (or later). It sets periodic inspection intervals and refers to Rolls‑Royce service bulletins for procedures. Aircraft operators with affected engines must schedule and pay for the inspections and any resulting repairs. The Civil Aviation Safety Authority (CASA) enforces the requirement for Australian-registered aircraft, which may affect maintenance timing and aircraft availability."},"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"},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a standard airworthiness directive adopting an existing European safety requirement for Australian jurisdiction. It has not expanded beyond its original purpose of ensuring the IP compressor shaft integrity on Trent 700 engines."},"complexity_factors":["Very short document (approximately 200 words)","Only 1 substantive requirement (inspect per EASA AD)","No defined terms section — relies entirely on external reference to EASA AD 2007-0136","No conditional logic or exceptions within the document itself","Single cross-reference to European legislation (EASA AD) and two Rolls-Royce service bulletins","Straightforward compliance structure: periodic inspections at specified intervals"],"plain_english_summary":"This AD mandates regular inspections of the IP compressor shaft on Rolls‑Royce RB211 Trent 700 engines (used on Airbus A330s) to detect cracks or damage that could lead to catastrophic engine failure. It applies to Australian operators and maintenance organisations using these engines, aligning domestic requirements with EASA AD 2007‑0136 to ensure consistent, safety‑critical oversight and reduce in‑flight engine‑related risks."}},"importantCases":[],"_links":{"self":"/api/acts/ad-trent-700-4-engine-ip-compressor-shaft-inspection","history":"/api/acts/ad-trent-700-4-engine-ip-compressor-shaft-inspection/history","analysis":"/api/acts/ad-trent-700-4-engine-ip-compressor-shaft-inspection/analysis","conflicts":"/api/acts/ad-trent-700-4-engine-ip-compressor-shaft-inspection/conflicts","importantCases":"/api/acts/ad-trent-700-4-engine-ip-compressor-shaft-inspection/important-cases","documents":"/api/acts/ad-trent-700-4-engine-ip-compressor-shaft-inspection/documents"}}