{"id":"F2007L02128","name":"AD/CF34/14 - Combustor Case Life Limits","slug":"ad-cf34-14-combustor-case-life-limits","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":67273,"registerId":"commonwealth-F2007L02128-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"General Electric Turbine Engines - CF34 ","sectionType":"division","heading":"General Electric Turbine Engines - CF34 Series","content":"### General Electric Turbine Engines - CF34 Series\n\n| AD/CF34/14 | Combustor Case Life Limits | 8/2007 |\n| ---------- | -------------------------- | ------ |\n\n| Applicability: | General Electric Company (GE) CF34-10E2A1, CF34-10E5, CF34-10E5A1,CF34-10E6, CF34-10E6A1, and CF34-10E7 turbofan engines.Note 1: These engines are installed on, but not limited to, Embraer ERJ-190 and-195 aeroplanes.                                                                                                                                                                                                                                                                                                                                        |\n| -------------- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n| Requirement:   | Revise the published life limit in the Airworthiness Limitations Section of theCF34-10E Engine Manual, for combustor cases, part number (P/N) 2070M47G02 and P/N 2070M47G03, from 39,600 cycles-since-new (CSN) to 24,600 CSN.The requirements of this AD have been met when the engine manual changes are made and operators have modified their continuous airworthiness maintenance plans to reflect the Engine Maintenance Program requirements specified in the GECF34-10E Engine Manual.Note 2: FAA AD 2007-12-09 Amdt 39-15087 dated 30 May 2007 refers. |\n| Compliance:    | Within 30 days after the effective date of this AD, unless the actions have already been done.                                                                                                                                                                                                                                                                                                                                                                                                                                                                  |\n|                | This Airworthiness Directive becomes effective on 2 August 2007.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                |\n| Background:    | This AD results from GE's evaluation of the effects to the combustor case due to installing version 5.10 software in the full-authority digital electronic control (FADEC), and revising the combustor case published life limit. The issuing of this AD is intended to prevent uncontained combustor case failure resulting in an in-flight engine shutdown and possible damage to the aeroplane.                                                                                                                                                              |\n\n![](image.001.png)  \nDavid Punshon  \nDelegate of the Civil Aviation Safety Authority\n\n12 June 2007","sortOrder":0},{"sectionNumber":"AD/CF34/14","sectionType":"part","heading":"AD/CF34/14","content":"## AD/CF34/14","sortOrder":1},{"sectionNumber":"Combustor Case Life Limits","sectionType":"part","heading":"Combustor Case Life Limits","content":"## Combustor Case Life Limits","sortOrder":2},{"sectionNumber":"8/2007","sectionType":"part","heading":"8/2007","content":"## 8/2007","sortOrder":3}],"analysis":{"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":true,"description":"The AD narrows component service life by reducing the combustor case life limit from 39,600 CSN to 24,600 CSN for the specified part numbers, thereby changing when parts must be retired and forcing updates to maintenance plans. It applies to GE CF34‑10E series engines (installed on, among others, Embraer ERJ‑190/195). The change is grounded in GE's FADEC v5.10 evaluation and is effective with a 30‑day compliance requirement and an effective date of 2 August 2007."},"complexity_factors":["Narrow, single technical amendment (reduces life limit for two specified P/Ns)","Applies only to defined CF34‑10E engine variants and listed part numbers","Requires amendment of the Airworthiness Limitations Section and operators' maintenance programs","Short compliance window (30 days) increases operational scheduling pressure","Technical basis tied to FADEC v5.10 evaluation — requires engine/software-specific engineering judgment","Cross-reference to FAA AD creates inter-jurisdictional compliance linkage","Costs concentrated on operators (earlier part retirement, administrative burden) but legal drafting is simple"],"plain_english_summary":"**This AD changes engine life limits.** It requires operators of GE CF34‑10E series engines to cut the published combustor case life for P/N 2070M47G02 and 2070M47G03 from 39,600 to 24,600 cycles‑since‑new, and to update the Airworthiness Limitations Section and maintenance plans. Compliance is due within 30 days; the AD is effective 2 August 2007. CASA cites GE's evaluation of FADEC software v5.10 and says the change aims to prevent uncontained combustor case failure. Operators bear earlier part retirement and administrative update costs."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This AD maintains its original narrow scope — a targeted safety response to a specific technical issue (software interaction with combustor case life). It has not expanded beyond its initial purpose of mandating a reduced life limit for two specific part numbers on defined engine models."},"complexity_factors":["Single, specific technical requirement with no conditional exceptions or alternative compliance methods","Only 2 part numbers affected, with straightforward applicability criteria","No defined terms section — all terminology is standard aviation maintenance language","Single compliance deadline (30 days) with no phased implementation or hour/cycle thresholds","No cross-references to other legislation or complex procedural requirements beyond updating manuals","Background explanation is concise and directly supports the requirement"],"plain_english_summary":"This Airworthiness Directive from CASA mandates shortening the life limit of GE CF34-10E combustor cases (PNs 2070M47G02/03) from 39,600 to 24,600 flight cycles after FAA findings that FADEC software version 5.10 alters wear characteristics. It affects operators of Embraer ERJ-190/195 and any aircraft with these engines. Operators must revise engine manuals and maintenance plans and comply within 30 days of 2 August 2007 to prevent potential uncontained failure or in-flight shutdown."},"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-cf34-14-combustor-case-life-limits","history":"/api/acts/ad-cf34-14-combustor-case-life-limits/history","analysis":"/api/acts/ad-cf34-14-combustor-case-life-limits/analysis","conflicts":"/api/acts/ad-cf34-14-combustor-case-life-limits/conflicts","importantCases":"/api/acts/ad-cf34-14-combustor-case-life-limits/important-cases","documents":"/api/acts/ad-cf34-14-combustor-case-life-limits/documents"}}