{"id":"F2006B06894","name":"AD/SD3-60/48 Amdt 2 - Stub Wing Shear Deck and Rib Corrosion","slug":"ad-sd3-60-48-amdt-2-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":114774,"registerId":"commonwealth-F2006B06894-current","compilationNumber":null,"startDate":"2026-04-03","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/SD3-60/48 Amdt 2 - 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 SD3-60 Series Aeroplanes\n\nAIRWORTHINESS DIRECTIVE\n\n![](image.002.png)\n\n![](image.002.png)  \nFor the reasons set out in the background section, the CASA delegate whose signature appears below revokes Airworthiness Directive (AD) AD/SD3-60/48 Amdt 1 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\nAD/SD3-60/48\n\nAmdt 2\n\n  \nStub Wing Shear Deck and Rib Corrosion 8/2001\n\nApplicability: All SD3-60 aircraft.\n\nRequirement: Action in accordance with Shorts Mandatory Service Bulletin SD360-53-43 Revision 2.\n\nNote: UK CAA AD 006-11-97 refers.\n\nCompliance: Initial Inspection: Unless the initial inspection is already accomplished and the required drain holes embodied; 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 required new drain holes in the lower shear deck, while the engineering intent of the document remained unchanged.\n\nAmendment 2 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\nAmendment 1 of this Airworthiness Directive became effective on 25 March 1999.\n\n![](image.003.png)The original issue of this Airworthiness Directive became effective on 26 March 1998.\n\n![](image.004.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 remains tightly focused on its original purpose: addressing corrosion in stub wing shear decks and ribs of SD3-60 aircraft. The background explicitly states the 'engineering intent of the document remained unchanged' from Amendment 1. Amendment 2 merely clarifies inspection intervals and accomplishment instructions without expanding the scope to new aircraft types, new structural areas, or new safety issues."},"complexity_factors":["Single, clearly defined applicability (all SD3-60 aircraft)","Straightforward conditional structure (two paths: corrosion found vs. not found)","Relies on external technical document (Shorts Mandatory Service Bulletin) for detailed instructions rather than embedding them","Minimal defined terms (only standard aviation terminology)","Simple compliance timeline with single fixed date for initial action and recurring 12-month interval thereafter","No nested exceptions or complex cross-referencing beyond reference to UK CAA AD and the service bulletin"],"plain_english_summary":"This CASA safety order (Amendment 2) applies to all Short SD3‑60 turboprops and replaces the prior order, requiring inspection of corrosion in the stub wing shear deck and ribs and mandated repairs per Shorts Mandatory Service Bulletin SD360‑53‑43 Rev 2. Owners, operators and maintenance engineers must inspect by 25 September 1999, follow the bulletin for repairs, and carry out ongoing or 12‑monthly re‑inspections as specified. It clarifies repeat‑inspection timing without changing the core requirement."},"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":4,"scope_assessment":{"changed":false,"description":"Amendment 2 clarifies repeat inspection requirements and accomplishment instructions but does not broaden applicability or add new types of work beyond the established engineering intent. The AD continues to apply to all SD3-60 aircraft and requires action in accordance with Shorts Mandatory Service Bulletin SD360-53-43 Revision 2; the background states the engineering intent remained unchanged while Amendment 2 clarifies inspection scheduling and instructions (Background; Requirement)."},"complexity_factors":["Cross-reference to an external mandatory service bulletin (Shorts Mandatory Service Bulletin SD360-53-43 Revision 2) as the operative Requirement, which requires operators to obtain and follow another document rather than containing full technical detail in the AD text (Requirement paragraph).","Conditional subsequent-inspection logic: different inspection intervals apply depending on whether corrosion is found or replaced, and one path requires incorporation into the Aircraft Maintenance Program Chapter 5-26-57 (Compliance: Subsequent Inspection clauses).","Amendment history and multiple effective dates (original AD, Amendment 1, Amendment 2, and stated effective dates), which may complicate determining which version and instructions apply to a particular aircraft (Background; amendment paragraphs).","Mandatory hardware/structural change implied by Amendment 1 (installation of new drain holes) combined with recurring inspection obligations increases operator workload and potential parts/labour costs (Background; Amendment 1 note).","References to other authorities (Note: UK CAA AD 006-11-97) create an additional source of normative material to check for consistency.","Fixed compliance deadline for the initial inspection (before 25 September 1999 unless already done) introduces retrospective timing complexity for record checks and compliance evidence (Compliance: Initial Inspection)."],"plain_english_summary":"This Airworthiness Directive requires operators of Short SD3-60 aircraft to inspect the stub wing shear decks and ribs for corrosion and to carry out repairs and drain‑hole modifications by following Shorts Mandatory Service Bulletin SD360‑53‑43 Revision 2. The Civil Aviation Safety Authority (via its delegate) sets specific compliance dates and recurring inspection intervals tied to whether corrosion is found. It matters because aircraft owners/operators must finance and schedule the inspections, repairs and any recurring maintenance actions to remain airworthy."}},"importantCases":[],"_links":{"self":"/api/acts/ad-sd3-60-48-amdt-2-stub-wing-shear-deck-and-rib-corrosion","history":"/api/acts/ad-sd3-60-48-amdt-2-stub-wing-shear-deck-and-rib-corrosion/history","analysis":"/api/acts/ad-sd3-60-48-amdt-2-stub-wing-shear-deck-and-rib-corrosion/analysis","conflicts":"/api/acts/ad-sd3-60-48-amdt-2-stub-wing-shear-deck-and-rib-corrosion/conflicts","importantCases":"/api/acts/ad-sd3-60-48-amdt-2-stub-wing-shear-deck-and-rib-corrosion/important-cases","documents":"/api/acts/ad-sd3-60-48-amdt-2-stub-wing-shear-deck-and-rib-corrosion/documents"}}