{"id":"F2006B06847","name":"AD/SD3-30/46 - Main Landing Gear Aft Pintle Pin Bushes","slug":"ad-sd3-30-46-main-landing-gear-aft-pintle-pin-bushes","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":114716,"registerId":"commonwealth-F2006B06847-current","compilationNumber":null,"startDate":"2026-04-03","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"AIRWORTHINESS DIRECTIVE","sectionType":"part","heading":"AIRWORTHINESS DIRECTIVE","content":"# AIRWORTHINESS DIRECTIVE\n\n![](image.001.png)\n\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 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\nShort SD3-30 Series Aeroplanes","sortOrder":0},{"sectionNumber":"AD/SD3-30/46 Main Landing Gear Aft Pintl","sectionType":"part","heading":"AD/SD3-30/46 Main Landing Gear Aft Pintle Pin Bushes 8/2003","content":"# AD/SD3-30/46 Main Landing Gear Aft Pintle Pin Bushes 8/2003\n\nApplicability: All SD3-30 aircraft.\n\nRequirement: Action in accordance with Shorts Mandatory Service Bulletin SD330-32-122.\n\nCompliance: At the next “D” Check after 7 August 2003 or before 30 April 2005, whichever occurs first.\n\nThis Airworthiness Directive becomes effective on 7 August 2003.\n\nBackground: The manufacturer received a report of an accident where the main landing gear failed to fully extend and lock. Investigation revealed deterioration and corrosion of the aft pintle pin bushes. Additionally, a high frequency of landing gear indication problems appear to be associated with deterioration of the aft pintle pin bushes.\n\n![Signature of David Villiers Delegate of the Civil Aviation Safety Authority](image.002.jpeg)  \n\nDavid Villiers\n\nDelegate of the Civil Aviation Safety Authority 18 June 2003\n\n![](image.001.png)","sortOrder":1}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a standard, purpose-built Airworthiness Directive. It addresses a specific safety-critical mechanical defect in a specific aircraft type with targeted remedial action. The scope remains tightly focused on the original safety purpose — preventing landing gear failure due to corroded pintle pin bushes."},"complexity_factors":["Very short document (under 300 words)","Only 4 defined structural sections (Applicability, Requirement, Compliance, Background)","Single, clear compliance trigger (next 'D' Check or fixed date)","No cross-references to other legislation beyond the enabling regulation (CASR 1998 subreg 39.1(1))","No nested exceptions or conditional logic — straightforward 'do this by this date' structure","Single aircraft type applicability with no sub-categories or exemptions"],"plain_english_summary":"This CASA Airworthiness Directive requires owners/operators of Short SD3-30 aircraft in Australia to inspect and, if needed, repair or replace corroded aft pintle pin bushes on the main landing gear using Shorts Mandatory Service Bulletin SD330-32-122.  \n\nAction must be done by the next D-check or by 30 April 2005, to prevent landing gear extension/locking failures and recurring false warnings after a reported accident."},"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":false,"description":"Scope remains aligned with the instrument's stated aim: it applies to all Short SD3‑30 aircraft and mandates compliance with the manufacturer's service bulletin to address deterioration of aft pintle pin bushes (see Applicability and Requirement). No expansion or narrowing of affected aircraft or measures is indicated in the text."},"complexity_factors":["Narrow applicability (Applicability: All SD3‑30 aircraft)","Single prescriptive remedy referencing an external document (Requirement: Shorts Mandatory Service Bulletin SD330‑32‑122)","Fixed, short compliance window tied to scheduled maintenance ('D' Check) (Compliance: next D Check after 7 Aug 2003 or before 30 Apr 2005)","Technical repair/inspection work requiring qualified maintenance personnel and parts","Safety-critical nature increases operational impact if not completed (Background: accident and indication problems linked to corrosion)","Low regulatory discretion — directive is prescriptive rather than principles-based (opening paragraph/requirement)"],"plain_english_summary":"Requires inspection and corrective action on the main landing gear aft pintle pin bushes of all Short SD3‑30 aircraft, to be done following Shorts Mandatory Service Bulletin SD330‑32‑122. Work must occur at the next “D” Check after 7 August 2003 or before 30 April 2005, whichever is earlier.\n\nIssued by CASA (delegate) after an accident and reports linking corroded aft pintle pin bushes to gear-extension failures; aircraft owners/operators pay for the maintenance and must schedule the downtime to comply."},"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"}},"importantCases":[],"_links":{"self":"/api/acts/ad-sd3-30-46-main-landing-gear-aft-pintle-pin-bushes","history":"/api/acts/ad-sd3-30-46-main-landing-gear-aft-pintle-pin-bushes/history","analysis":"/api/acts/ad-sd3-30-46-main-landing-gear-aft-pintle-pin-bushes/analysis","conflicts":"/api/acts/ad-sd3-30-46-main-landing-gear-aft-pintle-pin-bushes/conflicts","importantCases":"/api/acts/ad-sd3-30-46-main-landing-gear-aft-pintle-pin-bushes/important-cases","documents":"/api/acts/ad-sd3-30-46-main-landing-gear-aft-pintle-pin-bushes/documents"}}