{"id":"F2006B01841","name":"AD/A119/3 - Vertical Gyroscopes","slug":"ad-a119-3-vertical-gyroscopes","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":41039,"registerId":"commonwealth-F2006B01841-current","compilationNumber":null,"startDate":"2026-04-01","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"AIRWORTHINESS DIRECTIVE","sectionType":"part","heading":"AIRWORTHINESS DIRECTIVE","content":"# AIRWORTHINESS DIRECTIVE\n\n![](image.001.png)\n\n![](image.001.png)  \nFor the reasons set out in the background section, the CASA delegate whose signature appears below issues the following Airworthiness Directive (AD) under subregulation 39.1 (1) of CAR 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\nAgusta A119 Series Helicopters","sortOrder":0},{"sectionNumber":"AD/A119/3 Vertical Gyroscopes 3/2002 DM","sectionType":"part","heading":"AD/A119/3 Vertical Gyroscopes 3/2002 DM","content":"# AD/A119/3 Vertical Gyroscopes 3/2002 DM\n\nApplicability: All A119 helicopter equipped with vertical gyroscope part number (P/N) 501-1210- 01 (Goodrich Avionics Systems Inc. Model VG-208C) serial numbers (S/N) 2556 to 2694 inclusive.\n\nRequirement: 1. Replace vertical gyroscopes P/N 501-1210-01 S/N 2556 to 2694 inclusive, that do not incorporate Modification 17, in accordance with Agusta Alert Bollettino Tecnico 119-3 dated 21 December 2001.\n\n2. Vertical gyroscopes P/N 501-1210-01 S/N 2556 to 2694 inclusive, that do not incorporate Modification 17 may not be installed on any helicopter.\n\nNote: Italian Ente Nazionale per l’Aviazone Civile AD 2002-004 refers.\n\nCompliance: For Requirement 1 \\- Before 28 February 2002.\n\nFor Requirement 2 \\- As of the effective date of this Directive.\n\nThis Airworthiness Directive becomes effective on 30 January 2002.\n\nBackground: Agusta has advised that malfunction of the vertical gyroscopes, caused by incorrect installation of the pitch stop screw, may occur leading to instability of the helicopter during flight.\n\n![](image.002.png)\n\nEugene Paul Holzapfel\n\nDelegate of the Civil Aviation Safety Authority 22 January 2002\n\n![](image.001.png)","sortOrder":1}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This Airworthiness Directive maintains its original narrow scope. It addresses a specific manufacturing defect in a specific batch of vertical gyroscopes for a single helicopter model. There is no evidence of scope creep; the directive precisely targets the unsafe condition identified in the background without expanding to unrelated systems or aircraft types."},"complexity_factors":["Single, clearly defined applicability (one helicopter model, one part number, specific serial number range)","Only two straightforward requirements with no nested conditions or exceptions","Simple compliance timeline (single fixed date for replacement, immediate effect for installation ban)","No defined terms section or interpretive provisions","No cross-references to other legislation (only a non-binding note about an Italian aviation directive)","Total length is approximately 250 words"],"plain_english_summary":"This CASA safety order targets Agusta A119 helicopters fitted with Goodrich Avionics vertical gyroscopes (S/N 2556–2694) found to have a misinstalled pitch stop screw that can cause gyro failure and loss of control. It bans installing any unmodified units from 30 Jan 2002 and requires replacement with modified gyros by 28 Feb 2002. Operators, owners and maintenance personnel must comply immediately to prevent potential crashes."},"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"},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The directive applies only to A119 helicopters fitted with the listed gyroscope part and serial numbers and requires their replacement or non‑installation; no broader or narrower scope change is evident within the text."},"complexity_factors":[" narrowly targeted applicability by part number and a specific serial‑number range (P/N 501-1210-01, S/N 2556–2694) — requires precise parts tracking and inspection"," two-pronged requirement: mandatory replacement by a fixed calendar date and a continuing prohibition on installing affected units (Requirement 1 and 2)"," deadline and effective dates in short sequence (effective 30 Jan 2002; replacement before 28 Feb 2002) — operational scheduling pressure for operators"," reliance on external technical instructions (Agusta Alert Bollettino Tecnico 119-3) and cross-reference to an Italian AD — creates dependency on foreign manufacturer/regulator documents for compliance steps","verification of whether Modification 17 is incorporated — requires access to maintenance records or physical inspection to establish compliance status","legal basis cited (subregulation 39.1(1) of CAR 1998) — enforces mandatory compliance under airworthiness regulation"],"plain_english_summary":"Requires removal and replacement of specified vertical gyroscopes (P/N 501-1210-01, S/N 2556–2694) on Agusta A119 helicopters that do not have Modification 17, and prohibits installing those unmodified units. CASA says the change responds to a risk from an incorrectly installed pitch‑stop screw that can cause in‑flight instability. Aircraft owners/operators must follow Agusta Alert Bollettino instructions and complete replacements by 28 February 2002; they bear the cost and compliance burden."}},"importantCases":[],"_links":{"self":"/api/acts/ad-a119-3-vertical-gyroscopes","history":"/api/acts/ad-a119-3-vertical-gyroscopes/history","analysis":"/api/acts/ad-a119-3-vertical-gyroscopes/analysis","conflicts":"/api/acts/ad-a119-3-vertical-gyroscopes/conflicts","importantCases":"/api/acts/ad-a119-3-vertical-gyroscopes/important-cases","documents":"/api/acts/ad-a119-3-vertical-gyroscopes/documents"}}