{"id":"F2006B06844","name":"AD/SD3-30/43 - Elevator Torque Shaft Assembly Bearing Housings","slug":"ad-sd3-30-43-elevator-torque-shaft-assembly-bearing-housings","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":114710,"registerId":"commonwealth-F2006B06844-current","compilationNumber":null,"startDate":"2026-04-03","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/SD3-30/43 - Elevator Torque Shaft Assembly Bearing Housings","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 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\nShorts SD3-30 Series Aeroplanes\n\nAD/SD3-30/43 Elevator Torque Shaft Assembly Bearing\n\nHousings\n\n  \n10/2001\n\nApplicability: All SD3-30 aircraft.\n\nRequirement: Inspect in accordance with Shorts Mandatory Service Bulletin SD330-27-39.\n\nNote: UK CAA AD 007-05-2001 refers.\n\nCompliance: Before 4 December 2001, unless already accomplished; repeat thereafter in accordance with Aircraft Maintenance Programme Section 5-25-27.\n\nThis Airworthiness Directive becomes effective on 4 October 2001.\n\nBackground: An operator report was received of “free play” found in the elevator torque shaft assembly bearing housings at frame Stn. 74. Investigation determined that incorrect installation of the housings was the cause.\n\n![Signature of David Alan Villiers Delegate of the Civil Aviation Safety Authority](image.002.png)  \n\nDavid Alan Villiers\n\nDelegate of the Civil Aviation Safety Authority 22 August 2001\n\n![](image.001.png)\n\nThe above AD is notified in the Commonwealth of Australia Gazette on 12 September 2001.\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"},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a standard, narrow Airworthiness Directive targeting a specific unsafe condition in a specific aircraft type. The scope remains tightly focused on the elevator torque shaft bearing housing issue as originally identified."},"complexity_factors":["Single, specific technical requirement (one inspection task)","Only 1 defined applicability (all SD3-30 aircraft)","Clear, single compliance deadline with straightforward repeat interval","No nested exceptions or conditional logic","Cross-reference to only 1 external document (UK CAA AD) and 1 service bulletin","Short length (1 page), minimal legislative text"],"plain_english_summary":"This is an **Airworthiness Directive (AD)** — essentially a safety order issued by Australia's aviation regulator (CASA) requiring specific maintenance action on certain aircraft.\n\n**What it does:**\n- Requires owners/operators of **Shorts SD3-30 series aircraft** to inspect the **elevator torque shaft assembly bearing housings** (a component that helps control the aircraft's pitch/movement)\n- The inspection must follow a specific technical bulletin (Shorts Mandatory Service Bulletin SD330-27-39)\n- Must be done **before 4 December 2001** (unless already completed), then repeated according to the aircraft's maintenance schedule\n\n**Why it matters:**\nAn operator found \"free play\" (unwanted movement/looseness) in these bearing housings, caused by incorrect installation. This could affect aircraft control and safety.\n\n**Who it affects:**\n- All operators of Shorts SD3-30 aircraft in Australia\n- Maintenance organisations servicing these aircraft\n\n**Key point:** This is a mandatory safety fix — non-compliance means the aircraft cannot legally fly."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The AD applies to all SD3-30 aircraft and mandates inspection per a named service bulletin with a fixed initial date and recurring checks under the maintenance programme. The text does not expand or narrow applicability beyond that original, stated set of aircraft or replace the service-bulletin-based remedy."},"complexity_factors":["Narrow technical scope — single component on a single aircraft type (Applicability).","Single clear mandated action: inspect per an identified service bulletin (Requirement), reducing legislative ambiguity but creating a dependency on external technical instructions.","Fixed initial deadline plus ongoing repetition tied to the Aircraft Maintenance Programme (Compliance), creating short-term scheduling pressure and recurring obligations.","Corrective work not detailed in the AD itself — implementation depends on the service bulletin and maintenance providers' judgments (Requirement; Background).","Reference to a foreign regulator’s AD (UK CAA AD 007-05-2001) for context may require operators to reconcile multiple documents (Note/Background).","Costs and timing effects fall on operators or their contracted maintenance providers (Compliance)."],"plain_english_summary":"This directive requires all Shorts SD3-30 aircraft to have the elevator torque shaft bearing housings inspected per Shorts Mandatory Service Bulletin SD330-27-39 because incorrect installation was found to cause “free play”. The initial inspection must be done by 4 December 2001 and then repeated under the aircraft maintenance programme (Section 5‑25‑27).\n\nAircraft operators or their maintenance providers must perform the inspections and any corrective work, incurring associated costs and scheduling requirements. The AD points to the service bulletin for technical instructions (Requirement; Compliance; Background)."}},"importantCases":[],"_links":{"self":"/api/acts/ad-sd3-30-43-elevator-torque-shaft-assembly-bearing-housings","history":"/api/acts/ad-sd3-30-43-elevator-torque-shaft-assembly-bearing-housings/history","analysis":"/api/acts/ad-sd3-30-43-elevator-torque-shaft-assembly-bearing-housings/analysis","conflicts":"/api/acts/ad-sd3-30-43-elevator-torque-shaft-assembly-bearing-housings/conflicts","importantCases":"/api/acts/ad-sd3-30-43-elevator-torque-shaft-assembly-bearing-housings/important-cases","documents":"/api/acts/ad-sd3-30-43-elevator-torque-shaft-assembly-bearing-housings/documents"}}