{"id":"F2006B06840","name":"AD/SD3-30/38 Amdt 1 - Stub Wing Shear Deck and Rib Corrosion","slug":"ad-sd3-30-38-amdt-1-stub-wing-shear-deck-and-rib-corrosion","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":114704,"registerId":"commonwealth-F2006B06840-current","compilationNumber":null,"startDate":"2026-04-03","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/SD3-30/38 Amdt 1 - Stub Wing Shear Deck and Rib Corrosion","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![](image.002.png)  \nShort SD3-30 Series Aeroplanes\n\nAIRWORTHINESS DIRECTIVE\n\n![](image.002.png)\n\n![](image.003.png)For the reasons set out in the background section, the CASA delegate whose signature appears below revokes Airworthiness Directive (AD) AD/SD3-30/38 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\nApplicability: All SD3-30 aircraft.\n\n![](image.004.png)Requirement: Action in accordance with Shorts Mandatory Service Bulletin SD330-53-68 Revision 1.\n\nCompliance: Initial Inspection: Before 25 September 1999.\n\nSubsequent Inspection:\n\nWhere no corrosion is found, or where all corroded items have been replaced in accordance with the Requirement document, inspect in accordance with Aircraft Maintenance Program Chapter 5-26-57.\n\nWhere corrosion is found and remedial action taken to remove the corrosion, inspect in accordance with the Requirement document every 12 calendar months thereafter.\n\nThe compliance time for the initial inspection remains unchanged for this issue of the Directive.\n\nThis amendment becomes effective on 9 August 2001.\n\nBackground: Corrosion has been found in the area of the lower and upper shear decks and outer and inner ribs, especially the flanges.\n\nAmendment 1 is issued in response to a revision of the Requirement document, which introduces changes to clarify repeat inspection requirements and accomplishment instructions.\n\nCOMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 \\- 105 CIVIL AVIATION SAFETY AUTHORITY\n\nSCHEDULE OF AIRWORTHINESS DIRECTIVES\n\n![](image.006.png)![](image.005.png)The original issue of this Airworthiness Directive became effective on 25 March 1999.\n\n![](image.007.png)  \n\nDavid Alan Villiers\n\nDelegate of the Civil Aviation Safety Authority 26 June 2001\n\n![](image.002.png)  \n\nThe above AD is notified in the Commonwealth of Australia Gazette on 11 July 2001.","sortOrder":0}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":3,"scope_assessment":{"changed":false,"description":"This amendment maintains the original scope. It is a technical update to clarify inspection requirements and accomplishment instructions in the referenced service bulletin, without expanding the applicability or fundamental purpose of the directive."},"complexity_factors":["Single aircraft type applicability (SD3-30 only)","Straightforward conditional logic (two pathways based on corrosion findings)","References external technical document (Shorts Mandatory Service Bulletin SD330-53-68 Rev 1) without reproducing its contents","Simple temporal structure (initial deadline + recurring 12-month cycle)","No defined terms section or extensive cross-referencing to other legislation","Short document (approximately 300 words of substantive text)"],"plain_english_summary":"This AD revokes and replaces the earlier directive on corrosion in Short SD3‑30 (Short 330) aeroplanes, requiring inspections of the stub wing shear deck and ribs. It affects all SD3‑30 operators and their maintenance organisations and ensures corrosion is found and repaired to protect structural integrity. Amendment 1 clarifies inspection instructions but does not change the initial inspection deadline (25 September 1999)."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"Amendment 1 clarifies repeat inspection requirements and accomplishment instructions in the Requirement document but does not alter which aircraft are covered (all SD3-30) or the initial inspection deadline (initial inspection unchanged). The core obligation—inspect and remedy corrosion per the Mandatory Service Bulletin—remains the same (Background; Applicability; Compliance)."},"complexity_factors":["Direct reliance on an external technical document (Shorts Mandatory Service Bulletin SD330-53-68 Rev 1) for required actions, so legal compliance depends on that bulletin's technical detail (Requirement).","Conditional follow-up inspection paths: different schedules apply depending on whether corrosion is found or parts are replaced (Compliance).","Cross-reference to the operator's Aircraft Maintenance Program (Chapter 5-26-57) for the ‘no corrosion / replaced items’ case, requiring coordination between regulator, manufacturer instructions, and operator maintenance documentation (Compliance).","Revocation and replacement of a prior AD, but with the same initial inspection deadline (Background; Compliance), which may require operators to track historical AD versions.","Technical subject matter (corrosion inspection and repair) imposes specialised maintenance work and potential parts replacement costs for operators."],"plain_english_summary":"This Airworthiness Directive requires all Short SD3-30 aircraft to be inspected and, if needed, repaired for corrosion on lower/upper shear decks and inner/outer ribs, following Shorts Mandatory Service Bulletin SD330-53-68 Revision 1 (Requirement). The initial inspection deadline is stated as before 25 September 1999; ongoing inspections follow either the aircraft maintenance program or 12‑month repeats after corrosion removal (Compliance). Aircraft owners/operators pay for inspections and repairs; CASA (the delegate) mandates the timing and methods."},"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-sd3-30-38-amdt-1-stub-wing-shear-deck-and-rib-corrosion","history":"/api/acts/ad-sd3-30-38-amdt-1-stub-wing-shear-deck-and-rib-corrosion/history","analysis":"/api/acts/ad-sd3-30-38-amdt-1-stub-wing-shear-deck-and-rib-corrosion/analysis","conflicts":"/api/acts/ad-sd3-30-38-amdt-1-stub-wing-shear-deck-and-rib-corrosion/conflicts","importantCases":"/api/acts/ad-sd3-30-38-amdt-1-stub-wing-shear-deck-and-rib-corrosion/important-cases","documents":"/api/acts/ad-sd3-30-38-amdt-1-stub-wing-shear-deck-and-rib-corrosion/documents"}}