{"id":"F2006B09390","name":"AD/ECUREUIL/86 Amdt 1 - Horizontal Situation Indicator","slug":"ad-ecureuil-86-amdt-1-horizontal-situation-indicator","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":53717,"registerId":"commonwealth-F2006B09390-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/ECUREUIL/86 Amdt 1 - Horizontal Situation Indicator","content":"![](image.001.png)\n\nAIRWORTHINESS DIRECTIVE\n\n![](image.001.png)  \n\nFor the reasons set out in the background section, the CASA delegate whose signature appears below revokes Airworthiness Directive (AD) AD/ECUREUIL/86 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\nEurocopter AS 350 (Ecureuil) Series Helicopters\n\nAD/ECUREUIL/86\n\nAmdt 1\n\n  \nHorizontal Situation Indicator 5/2004\n\nApplicability: EC 130 B4 helicopters equipped with Bendix/King KI 525A Horizontal Situation Indicator (HSI).\n\nRequirement: 1. Check the part number (P/N) of the KI 525A HSI installed on the helicopter.\n\nInitially, no further action is necessary if the P/N is not 066-3046-07.\n\n    2. If the P/N is 066-3046-07, modify the HSI installation in accordance with Eurocopter Alert Telex 34A002 paragraph 2.A.1, for helicopters with the HSI connected to a single navigation system, or paragraph 2.A.2, for helicopters with the HSI connected to at least two navigation systems.\n\nNote 1: Modification in accordance with Eurocopter Alert Service Bulletin (ASB) 34A002 is considered acceptable for compliance with Requirement 2.\n\n    3. Before installing a KI 525A HSI P/N 066-3046-07 in place of a KI 525A HSI with P/Ns 066-3046-00, -01, -04 or -05 ensure that the HSI installation is modified in accordance with Requirement 2.\n\nNote 2: DGAC AD F-2002-279-003 R1 refers.\n\nCompliance: For Requirement 1 \\- Remains unchanged as ‘Either within 100 hours time in service after the effective date of the original issue of this Directive or before 10 August 2003, whichever occurs first’.\n\nFor Requirement 2 \\- Before further flight after the Requirement 1 check. For Requirement 3 - As of the effective date of this Amendment.\n\nThis Amendment becomes effective on 13 May 2004.\n\nBackground: Eurocopter has advised the French Direction Générale de l’Aviation Civile that KI 525A HSIs P/N 066-3046-07 may have been incorrectly installed on some helicopters. The incorrect installation may result in navigation errors.\n\nThe original issue of this Directive introduced measures to ensure that the affected HSIs were correctly installed.\n\nEurocopter AS 350 (Ecureuil) Series Helicopters\n\nAD/ECUREUIL/86 Amdt 1 (continued)\n\nThis Amendment contains some minor editorial amendments, together with allowing credit for modifications carried out in accordance with the ASB and introduces measures to ensure that the helicopter is modified prior to the installation of a\n\nKI 525A HSI P/N 066-3046-07.\n\nThe original issue of this Airworthiness Directive became effective on 10 July 2003.\n\n![Signature of James Coyne, Delegate of the Civil Aviation Safety Authority.](image.002.png)  \n\nJames Coyne\n\nDelegate of the Civil Aviation Safety Authority 2 April 2004\n\n![](image.001.png)  \n\nThe above AD is notified in the Commonwealth of Australia Gazette on 21 April 2004.","sortOrder":0}],"analysis":{"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":true,"description":"The amendment does not broaden the fleet applicability (still EC 130 B4 with KI 525A HSIs) but changes compliance mechanics: it adds explicit credit for modifications done under Eurocopter ASB 34A002 and imposes a new pre-installation requirement that any replacement KI 525A P/N 066-3046-07 must be installed only after the installation has been modified (see 'This Amendment contains...' paragraph; Requirement 3; Note 1). Timing for the initial part-number check remains as originally set, while Requirement 2 is required 'before further flight' after the check (Compliance)."},"complexity_factors":["Narrow applicability: only EC 130 B4 helicopters with Bendix/King KI 525A HSIs (Applicability).","Technical specificity: action depends on exact part numbers (P/N 066-3046-07 vs P/Ns 066-3046-00, -01, -04, -05) (Requirement 1, 3).","Conditional actions: different modification procedures depending on whether HSI is connected to a single or multiple navigation systems (Requirement 2 referring to Eurocopter Alert Telex 34A002 ¶2.A.1 and ¶2.A.2).","External-document dependency: compliance relies on Eurocopter Alert Telex 34A002 and Eurocopter ASB 34A002 (Requirement 2; Note 1).","Strict timing: some work must be completed 'before further flight' after the part-number check (Compliance: Requirement 2).","Regulatory formality: revokes an earlier AD and records amendment effective dates and Gazette notification (preamble, final paragraphs).","Operational burden: inspection and modification require qualified maintenance action and may ground an affected helicopter until completed (Requirement 1, Requirement 2).","Credit and equivalence: allows credit for modifications done under ASB 34A002, creating a compliance-equivalence mechanism (Note 1)."],"plain_english_summary":"This Airworthiness Directive requires operators of Eurocopter EC 130 B4 helicopters fitted with a Bendix/King KI 525A Horizontal Situation Indicator (HSI) to check the HSI part number and, if it is P/N 066-3046-07, modify the installation per Eurocopter instructions before further flight. It also bars installing P/N 066-3046-07 unless the HSI installation is modified. The steps aim to prevent navigation errors caused by incorrect HSI installation."},"flash_summary_failed":{"failed":true,"reason":"Unauthenticated. Configure AI_GATEWAY_API_KEY or use a provider module. Learn more: https://ai-sdk.dev/unauthenticated-ai-gateway","source":"analysis-cron"},"kimi_summary":{"content_quality":"ok","complexity_score":3,"scope_assessment":{"changed":false,"description":"This amendment remains tightly focused on its original purpose — ensuring correct installation of the Bendix/King KI 525A HSI in specific Eurocopter helicopters. The amendment makes minor editorial changes and adds a provision about replacement parts (Requirement 3), but this is a logical extension of the original safety intent rather than scope creep. The core applicability (EC 130 B4 helicopters with specific HSI part numbers) and the fundamental safety objective (preventing navigation errors) remain unchanged from the original July 2003 directive."},"complexity_factors":["Multiple conditional requirements (3 separate requirements with different triggers)","Specific part number references (066-3046-07 vs -00, -01, -04, -05) requiring technical cross-checking","Dual-path compliance depending on aircraft configuration (single vs multiple navigation systems)","Cross-reference to external technical documents (Eurocopter Alert Telex 34A002 and ASB 34A002)","Three different compliance dates/timing rules","Reference to foreign aviation directive (DGAC AD F-2002-279-003 R1 from France)"],"plain_english_summary":"This CASA safety order targets Eurocopter EC 130 B4 helicopters fitted with a specific Horizontal Situation Indicator (HSI) part number 066‑3046‑07 that may be incorrectly installed and provide false navigation data. Operators must inspect for that part, modify any affected installations per Eurocopter instructions before further flight, and ensure replacements are already corrected. It prevents potentially fatal navigation errors."}},"importantCases":[],"_links":{"self":"/api/acts/ad-ecureuil-86-amdt-1-horizontal-situation-indicator","history":"/api/acts/ad-ecureuil-86-amdt-1-horizontal-situation-indicator/history","analysis":"/api/acts/ad-ecureuil-86-amdt-1-horizontal-situation-indicator/analysis","conflicts":"/api/acts/ad-ecureuil-86-amdt-1-horizontal-situation-indicator/conflicts","importantCases":"/api/acts/ad-ecureuil-86-amdt-1-horizontal-situation-indicator/important-cases","documents":"/api/acts/ad-ecureuil-86-amdt-1-horizontal-situation-indicator/documents"}}