{"id":"F2006B03546","name":"AD/BAe 146/99 Amdt 1 - Elevator Surface Flight Damper","slug":"ad-bae-146-99-amdt-1-elevator-surface-flight-damper","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":43113,"registerId":"commonwealth-F2006B03546-current","compilationNumber":null,"startDate":"2026-04-01","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/BAe 146/99 Amdt 1 - Elevator Surface Flight Damper","content":"COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY\n\nSCHEDULE OF AIRWORTHINESS DIRECTIVES\n\n![](image.001.png)  \n\nAIRWORTHINESS 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 revokes Airworthiness Directive (AD) AD/BAe 146/99 and issues the following 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\nBritish Aerospace BAe 146 Series Aeroplanes\n\nAD/BAe 146/99\n\nAmdt 1\n\n  \nElevator Surface Flight Damper 10/2002\n\nApplicability: All BAe 146 Series aircraft.\n\nAll Avro 146-RJ Series aircraft.\n\nRequirement: Action in accordance with BAE Systems Mandatory Service Bulletin 27-169-01692A Revision 1.\n\nCompliance: During the next ‘C’ check or maintenance period which is planned to exceed 3 consecutive calendar days after 3 October 2002, whichever occurs first; but not later than 31 January 2004.\n\nThis Amendment becomes effective on 3 October 2002.\n\nBackground: During certain atmospheric conditions, elevator stability can be reduced by the formation of ice on the elevator servo tab. This can result in a phenomenon known as ‘pitch oscillation’. Elevator surface dampers address this by providing additional damping directly to the elevator, thus suppressing the oscillation. This Directive requires installation of elevator surface dampers.\n\nAmendment 1 is issued in response to a revision of the Requirement document, which deleted reference to dependant modifications and changed the compliance time.\n\nThe original issue of this Airworthiness Directive became effective on 13 June 2002.\n\n![Signature of David Villiers, Delegate of the Civil Aviation Safety Authority.](image.002.jpeg)  \n\nDavid Alan Villiers\n\nDelegate of the Civil Aviation Safety Authority 22 August 2002\n\n![](image.001.png)\n\nThe above AD is notified in the Commonwealth of Australia Gazette on 11 September 2002.\n\n  \n\nPage 1 of 1","sortOrder":0}],"analysis":{"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"},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The amendment revises the Requirement document (removing reference to dependent modifications) and adjusts the compliance time, but does not change the applicability: all BAe 146 and Avro 146-RJ aircraft remain in scope. The change alters execution and timing rather than which aircraft are covered."},"complexity_factors":["Single, narrowly defined technical remedy (installation of elevator surface dampers) referenced to a single Mandatory Service Bulletin","Clear applicability to all BAe 146 and Avro 146-RJ aircraft limits legal ambiguity","Compliance timing tied to maintenance scheduling ('C' check or specified dates) introduces operational scheduling complexity for operators","Amendment revises requirement document (deleted dependent modifications) and changed compliance time, requiring operators to track the revised service bulletin","Enforcement and revocation of a prior AD by CASA delegate creates a simple regulatory hook but requires administrative compliance records"],"plain_english_summary":"This Airworthiness Directive requires installation of elevator surface dampers on all BAe 146 and Avro 146‑RJ series aircraft, carried out to BAE Systems Mandatory Service Bulletin 27-169-01692A Revision 1. Operators or their maintenance organisations must complete the work during the next ‘C’ check or the first maintenance period exceeding three consecutive days after 3 October 2002, and no later than 31 January 2004 (Requirement; Compliance). It creates a mandatory maintenance obligation, associated downtime and direct cost for aircraft operators."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This amendment remains tightly focused on its original purpose: addressing elevator stability issues through damper installation. The amendment merely updates the technical reference and compliance timing without expanding the scope to additional aircraft types, systems, or safety issues."},"complexity_factors":["Single, clearly defined applicability (two specific aircraft series)","Only one technical requirement referencing an external service bulletin","Straightforward compliance deadline with simple alternative triggers ('C' check OR 3+ day maintenance window)","Minimal defined terms (only 'C' check requires industry knowledge)","No nested exceptions or conditional logic","Short document (approximately 300 words)","Single amendment with clearly stated purpose"],"plain_english_summary":"This AD mandates that all operators of British Aerospace BAe 146 and Avro 146‑RJ series aircraft install elevator surface flight dampers to prevent dangerous pitch oscillation caused by ice buildup on the elevator servo tab. Installations must follow BAE Systems Mandatory Service Bulletin 27‑169‑01692A Rev 1 and be completed at the next C‑check or any maintenance lasting over three days, and no later than 31 January 2004. The amendment updates the technical instructions and compliance timing."}},"importantCases":[],"_links":{"self":"/api/acts/ad-bae-146-99-amdt-1-elevator-surface-flight-damper","history":"/api/acts/ad-bae-146-99-amdt-1-elevator-surface-flight-damper/history","analysis":"/api/acts/ad-bae-146-99-amdt-1-elevator-surface-flight-damper/analysis","conflicts":"/api/acts/ad-bae-146-99-amdt-1-elevator-surface-flight-damper/conflicts","importantCases":"/api/acts/ad-bae-146-99-amdt-1-elevator-surface-flight-damper/important-cases","documents":"/api/acts/ad-bae-146-99-amdt-1-elevator-surface-flight-damper/documents"}}