{"id":"F2006B02435","name":"AD/APU/17 Amdt 1 - Saphir 20 Model 095 Female Quill Shaft Cycles Since New","slug":"ad-apu-17-amdt-1-saphir-20-model-095-female-quill-shaft-cycles-since-new","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":41691,"registerId":"commonwealth-F2006B02435-current","compilationNumber":null,"startDate":"2026-04-01","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/APU/17 Amdt 1 - Saphir 20 Model 095 Female Quill Shaft Cycles Since New","content":"![](image.001.png)\n\n![](image.001.png)  \nAIRWORTHINESS DIRECTIVE\n\nFor the reasons set out in the background section, the CASA delegate whose signature appears below revokes Airworthiness Directive (AD) AD/APU/17 and issues the following 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\nAuxiliary Power Units\n\nAD/APU/17\n\nAmdt 1\n\n  \n\nSaphir 20 Model 095 Female Quill Shaft Cycles Since New\n\n  \n1/2005\n\nApplicability: Microturbo Auxiliary Power Unit (APU) Saphir 20, model 095, installed on Super Puma 332 L2 helicopters.\n\nRequirement: 1. Remove from service female quill shaft reference 095-40-193-01.\n\n2. Do not install female quill shaft reference 095-40-193-01 that has accumulated 460 cycles since new (CSN) or more.\n\nNote 1: All Saphir 20 model 095 APUs are currently equipped with this female quill shaft.\n\nNote 2: DGAC Airworthiness Directive F-2004-177 R1 dated 24 November 2004 as approved by EASA reference 2004-11120 dated 17 November 2004 refers.\n\nCompliance: 1. Before accumulating 460 CSN. Female quill shafts that have accumulated 460 CSN or more on the effective date of this Directive are to be removed before 10 additional cycles.\n\n2. As of the effective date of this Airworthiness Directive. This Amendment becomes effective on 20 January 2005.\n\nBackground: A case of rupture of the female quill shaft, which links the accessory gearbox to the gas generator, was discovered in service. The rupture of the female quill shaft may result in generator over speed followed by an uncontained burst.\n\nThis Airworthiness Directive is an interim measure to address an unsafe condition till determination of root causes of the failure of female quill shaft is made and final solution is found out.\n\nAuxiliary Power Units\n\nAD/APU/17 Amdt 1 (continued)\n\n![](image.002.png)  \nRevision 1 of this AD reduces the applicability to Super Puma 332 L2 helicopters. The original issue of this AD became effective on 24 November 2004.\n\nJames Coyne\n\nDelegate of the Civil Aviation Safety Authority 3 December 2004\n\n![](image.001.png)  \n\nThe above AD is notified in the Commonwealth of Australia Gazette on 22 December 2004.","sortOrder":0}],"analysis":{"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":true,"description":"Revision 1 narrowed the affected fleet: the AD’s applicability was reduced to Super Puma 332 L2 helicopters (Revision note: \"Revision 1 of this AD reduces the applicability to Super Puma 332 L2 helicopters\"). The amendment revokes the prior AD/APU/17 and reissues the requirement and compliance timing (header and Compliance)."},"complexity_factors":["Single, numeric life-limit makes compliance rule simple (Requirement: remove at 460 CSN; Compliance: remove before 460 CSN or within 10 cycles if already ≥460).","Narrow applicability reduces administrative burden — applies to Saphir 20 model 095 on Super Puma 332 L2 only (Applicability).","Amendment and revocation history adds administrative tracking: this AD revokes AD/APU/17 and is Revision 1 (header and final paragraph noting revision).","Interim measure status creates potential for further regulatory change once root cause is determined (Background: interim measure until final solution found).","Cross-reference to foreign directives (DGAC/EASA) introduces interjurisdictional conformity considerations (Note 2).","Operational impacts include parts procurement and asset downtime risk for operators who must replace shafts and track CSN (Requirement and Compliance).","Effective-date timing (becomes effective 20 January 2005) constrains scheduling and immediate compliance (Compliance)."],"plain_english_summary":"Mechanically, this Airworthiness Directive requires removal and prohibits installation of Microturbo Saphir 20 model 095 female quill shaft ref 095-40-193-01 once it reaches 460 cycles since new; shafts with 460 CSN or more on the AD’s effective date must be removed within 10 additional cycles. It applies to APUs installed on Super Puma 332 L2 helicopters. CASA issued it as an interim safety measure after an in‑service shaft rupture that could cause generator overspeed and an uncontained burst. Operators bear replacement costs and must track CSN and downtime."},"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":true,"description":"This Amendment 1 explicitly narrows the scope compared to the original November 2004 directive. The revision 'reduces the applicability to Super Puma 332 L2 helicopters' — meaning the original AD likely applied more broadly to other aircraft types, but this amendment restricts it to just one helicopter model. This represents a scope reduction rather than expansion."},"complexity_factors":["Single mechanical component targeted (female quill shaft)","Simple numeric compliance threshold (460 cycles since new)","Minimal cross-references (only one reference to French DGAC/EASA directive)","Clear, unambiguous compliance deadline structure","No nested exceptions or conditional logic — straightforward binary compliance (above/below 460 CSN)","Short document length (approximately 300 words of substantive text)","Only 2 defined terms requiring technical knowledge (CSN = Cycles Since New, APU = Auxiliary Power Unit)"],"plain_english_summary":"This Airworthiness Directive from CASA orders operators of Super Puma 332 L2 helicopters using the Microturbo Saphir 20 (model 095) APU to remove from service any female quill shaft (P/N 095-40-193-01) that has reached 460 cycles since new and not to install shafts at or above that limit. If a shaft already has 460+ cycles at issue, it must be removed within 10 more cycles.\n\nThis is an interim emergency measure to prevent in‑service rupture and uncontrolled generator failure while a permanent fix is developed."}},"importantCases":[],"_links":{"self":"/api/acts/ad-apu-17-amdt-1-saphir-20-model-095-female-quill-shaft-cycles-since-new","history":"/api/acts/ad-apu-17-amdt-1-saphir-20-model-095-female-quill-shaft-cycles-since-new/history","analysis":"/api/acts/ad-apu-17-amdt-1-saphir-20-model-095-female-quill-shaft-cycles-since-new/analysis","conflicts":"/api/acts/ad-apu-17-amdt-1-saphir-20-model-095-female-quill-shaft-cycles-since-new/conflicts","importantCases":"/api/acts/ad-apu-17-amdt-1-saphir-20-model-095-female-quill-shaft-cycles-since-new/important-cases","documents":"/api/acts/ad-apu-17-amdt-1-saphir-20-model-095-female-quill-shaft-cycles-since-new/documents"}}