{"id":"F2006L00744","name":"AD/DAUPHIN/72 Amdt 1 - Hydraulic Power - Hydraulic Pipes Clamps","slug":"ad-dauphin-72-amdt-1-hydraulic-power-hydraulic-pipes-clamps","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":136767,"registerId":"commonwealth-F2006L00744-current","compilationNumber":null,"startDate":"2026-04-03","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"Eurocopter SA 360 and SA 365 (Dauphin) S","sectionType":"division","heading":"Eurocopter SA 360 and SA 365 (Dauphin) Series Helicopters","content":"### Eurocopter SA 360 and SA 365 (Dauphin) Series Helicopters\n\n| AD/DAUPHIN/72 Amdt 1 | Hydraulic Power - Hydraulic Pipes Clamps | 4/2006 |\n| -------------------- | ---------------------------------------- | ------ |\n\n| Applicability: | Eurocopter Model SA 365 N and N1, AS 365 N2 and N3 helicopters, not modified per Mod 0729B67. |\n| -------------- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n| Requirement: | AS 365 N2 and N3 model helicopters delivered after 01 January 1998:1. Replace attachment clamps in accordance with paragraph 2.B.4. of Eurocopter Alert Service Bulletin (ASB) No. 29.00.08 dated 15 November 2005 or later revisions approved by the French DGAC (installation of compliant attachment clamps).2. Do not install clamps with silicone protection on hydraulic pipes.AS 365 N2 and N3 model helicopters, delivered prior to 01 January 1998; and SA 365 N and N1 model helicopters:3. Inspect the attachment clamps of the left hand (LH) hydraulic power system and carry out corrective action, if required, in accordance with paragraph 2.B.5 (Checking the attachment clamps of the LH hydraulic power system ) of ASB No. 29.00.08 or later revisions approved by the French DGAC.4. Do not install clamps with silicone protection on hydraulic pipes.Note: DGAC AD UF-2006-042 as approved by EASA under reference number 2006-0042-E dated 10 February 2006 refers. AD UF-2006-042 supersedes DGAC ADF-2004-115, which now stands cancelled. |\n| Compliance: | 1. Unless previously installed, within 50 flying hours or 1 month after the effective date of this Directive, whichever occurs first.2. From the effective date of this Directive.3. Unless previously installed, within 660 flying hours or 26 months after the effective date of this Directive, whichever occurs first.4. From the effective date of this Directive. |\n\n| | This Amendment becomes effective on 13 April 2006. |\n| ----------- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n| Background: | Following an incident on the hydraulic power system of an EC 155 B1 helicopter in flight, which led to illumination of the \"HYD\" warning light, with no further consequence, a leak was found in the pressure pipe of the LH hydraulic pump.Analysis conducted by Eurocopter has revealed damage to the silicone protection of an attachment clamp due to contact with hydraulic fluid. The damage caused the clamp to chafe against the pipe, which led to wear and subsequent perforation of the pipe.Consequently, to prevent any wear of the hydraulic pipes, original issue of this AD imposed a mandatory periodic check of the condition of the attachment clamps and pipes pending installation of attachment clamps fitted with an acrylonitrile butadiene or polychloroprene protection which retains the mechanical characteristics in a hydraulic environment.Current amendment requires installation of ASB No. 29.00.08 compliant clamps and extends the AD applicability to model SA 365 N and N1 helicopters and refers to the latest DGAC AD and related service literature on the subject.The original issue of this AD became effective on 30 September 2004. |\n\n![](image.001.png) \nJayaprakashan Ambali \nDelegate of the Civil Aviation Safety Authority\n\n21 February 2006","sortOrder":0},{"sectionNumber":"AD/DAUPHIN/72 Amdt 1","sectionType":"part","heading":"AD/DAUPHIN/72 Amdt 1","content":"## AD/DAUPHIN/72 Amdt 1","sortOrder":1},{"sectionNumber":"Hydraulic Power - Hydraulic Pipes Clamps","sectionType":"part","heading":"Hydraulic Power - Hydraulic Pipes Clamps","content":"## Hydraulic Power - Hydraulic Pipes Clamps","sortOrder":2},{"sectionNumber":"4/2006","sectionType":"part","heading":"4/2006","content":"## 4/2006","sortOrder":3}],"analysis":{"flash_summary":{"complexity_score":6,"scope_assessment":{"changed":true,"description":"The amendment broadened the AD's scope by adding SA 365 N and N1 models and shifted from a temporary periodic-check regime to requiring installation of ASB-compliant clamps for post‑1998 deliveries while retaining inspections for earlier deliveries. It also formalises the ban on silicone-protected clamps and references DGAC AD UF-2006-042 as the current authoritative service literature (Background; Requirement)."},"complexity_factors":["Multiple helicopter models with an explicit exclusion (applies to SA 365 N, N1, AS 365 N2/N3; excludes Mod 0729B67).","Different obligations depending on delivery date (post‑1998: mandatory replacement; pre‑1998: inspection and corrective action).","Two distinct technical actions referenced in separate ASB paragraphs (replace per para 2.B.4; inspect per para 2.B.5).","Multiple, tight compliance timelines (50 flying hours/1 month for replacement; 660 flying hours/26 months for inspection; immediate prohibition on silicone clamps).","Dependency on external technical material and foreign regulator approvals (Eurocopter ASB No.29.00.08; French DGAC AD UF-2006-042 and DGAC approval of ASB revisions).","Regulatory discretion introduced by requiring later ASB revisions only if approved by the French DGAC.","Compliance imposes operational costs on operators (parts replacement, inspections, labour, grounding time) and administrative burden to track delivery-date cutoffs.","Safety-technical specificity (material compatibility of clamp protections) increases demand for correct parts and supplier verification."],"plain_english_summary":"This airworthiness directive requires Eurocopter Dauphin operators to replace or inspect hydraulic pipe attachment clamps and bans clamps with silicone protection to prevent chafing and pipe perforation. It applies to SA 365 N/N1 and AS 365 N2/N3 helicopters (except those modified by Mod 0729B67) and sets short compliance windows for replacement (50 flying hours or 1 month) or inspection (660 flying hours or 26 months). The measures reference Eurocopter ASB No.29.00.08 and require French DGAC-approved revisions (Requirement paras 1–4; Compliance paras 1–4)."},"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":3,"scope_assessment":{"changed":true,"description":"The original directive (effective September 2004) only required periodic inspections pending installation of improved clamps. This amendment expands the scope significantly: it mandates actual replacement of clamps for newer helicopters, extends coverage to additional helicopter models (SA 365 N and N1), and imposes an outright prohibition on silicone-protected clamps. The directive has evolved from a temporary monitoring measure to a comprehensive hardware modification and fleet-wide ban."},"complexity_factors":["Multiple applicability categories based on helicopter model and delivery date (4 distinct groups)","Cross-reference to external technical document (Eurocopter Alert Service Bulletin No. 29.00.08)","Dual compliance timelines (flying hours OR calendar time, whichever comes first)","Reference to French DGAC and EASA regulatory equivalents for approval authority","Nested requirements with conditional logic (\"unless previously installed\", \"do not install\")","Technical terminology requiring aviation engineering knowledge (acrylonitrile butadiene, polychloroprene protection)"],"plain_english_summary":"This CASA Airworthiness Directive orders owners/operators of certain Eurocopter Dauphin helicopters to replace or inspect hydraulic pipe clamps to stop silicone-protected clamps rubbing through pipes and causing hydraulic failure. It targets AS/SA 365 N-series aircraft and bans installing silicone-protected clamps from the effective date.\n\nNewer aircraft must replace clamps promptly; older aircraft must inspect their left‑hand hydraulic clamps within the specified flying‑hour/time limits and repair any defects—measures intended to prevent in‑flight loss of hydraulic control."}},"importantCases":[],"_links":{"self":"/api/acts/ad-dauphin-72-amdt-1-hydraulic-power-hydraulic-pipes-clamps","history":"/api/acts/ad-dauphin-72-amdt-1-hydraulic-power-hydraulic-pipes-clamps/history","analysis":"/api/acts/ad-dauphin-72-amdt-1-hydraulic-power-hydraulic-pipes-clamps/analysis","conflicts":"/api/acts/ad-dauphin-72-amdt-1-hydraulic-power-hydraulic-pipes-clamps/conflicts","importantCases":"/api/acts/ad-dauphin-72-amdt-1-hydraulic-power-hydraulic-pipes-clamps/important-cases","documents":"/api/acts/ad-dauphin-72-amdt-1-hydraulic-power-hydraulic-pipes-clamps/documents"}}