{"id":"F2006B07019","name":"AD/SF340/89 - Nacelle Internal Structure","slug":"ad-sf340-89-nacelle-internal-structure","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":48679,"registerId":"commonwealth-F2006B07019-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"AIRWORTHINESS DIRECTIVE","sectionType":"part","heading":"AIRWORTHINESS DIRECTIVE","content":"# AIRWORTHINESS 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\nSAAB SF340 Series Aeroplanes","sortOrder":0},{"sectionNumber":"AD/SF340/89 Nacelle Internal Structure 3","sectionType":"part","heading":"AD/SF340/89 Nacelle Internal Structure 3/2003","content":"# AD/SF340/89 Nacelle Internal Structure 3/2003\n\nApplicability: Model SF340A aircraft, serial numbers 004 through 159.\n\nModel 340B aircraft, serial numbers 160 through 459.\n\nRequirement: Inspect in accordance with Saab Aircraft Mandatory Service Bulletin (SB) No. 340- 54-043 dated 18 December 2002, or SB No. 340-54-043 Revision 1 dated 16 January\n\n2003.\n\nNote: LFV AD No. 1-176 refers.\n\nCompliance: As specified in the Requirement document, with a revised effective date of 20 March 2003.\n\nThis Airworthiness Directive becomes effective on 20 March 2003.\n\nBackground: Field experience has revealed cracks in the outer flange of engine nacelle frame STA 203 and WL96. The affected area is inspected using a NDT method, due to\n\nin-accessibility.\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 4 February 2003\n\n![](image.001.png)","sortOrder":1}],"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 airworthiness directive with a narrow, specific safety purpose: addressing a known cracking issue in a particular aircraft component. The scope remains tightly focused on the original safety concern without expansion into broader operational or regulatory matters."},"complexity_factors":["Very short document (under 300 words)","Only 2 defined applicability criteria (aircraft models and serial numbers)","Single requirement referencing an external technical document (Saab Service Bulletin)","No nested exceptions or conditional logic","No cross-references to other legislation beyond a single note about a Swedish aviation directive (LFV AD No. 1-176)","Straightforward compliance timeline (external document specifies timing)"],"plain_english_summary":"This CASA safety order requires owners/operators of Saab SF340 (serials 004–459) to perform mandatory NDT inspections of the nacelle internal structure at STA 203/WL96 after discovery of cracks in the outer flange. It directs compliance with Saab Service Bulletin 340-54-043 (Dec 2002/Jan 2003 revision) and took effect 20 March 2003 to prevent possible structural failure in flight."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The directive does not expand or narrow the set of affected aircraft; it prescribes inspections per Saab Service Bulletin and sets a revised effective date. The Requirement accepts a SB and its Revision 1 (Requirement), and the Compliance provision sets the effective date as 20 March 2003 (Compliance). There is no text in the instrument indicating a substantive change to applicability or required actions beyond those referenced SBs."},"complexity_factors":["Applicability is limited to specific serial-number ranges (Applicability), which simplifies scope but requires accurate fleet identification.","Mandates follow an external Saab Mandatory Service Bulletin (Requirement), creating operational dependence on that technical document and its revisions.","Accepts two closely dated SB versions (Requirement), requiring operators to confirm which revision applies.","Uses non-destructive testing (NDT) because the affected zone is inaccessible (Background), adding technical skill and equipment needs for compliance.","Revised effective date is specified (Compliance), so timing coordination is required by operators.","Regulatory action is issued by a CASA delegate (signature block), reflecting delegated administrative authority.","Cross-reference to a foreign AD (LFV AD No. 1-176) is noted (Requirement/Note), introducing potential cross-jurisdictional alignment issues."],"plain_english_summary":"This Airworthiness Directive requires operators of Saab SF340A (serials 004–159) and 340B (serials 160–459) aeroplanes to carry out inspections of the engine nacelle internal structure in line with the Saab Mandatory Service Bulletin specified (Requirement). CASA’s delegate issues the AD and sets the effective date; operators must complete the inspections and any corrective action by the timing in the service bulletin (Compliance). The inspections use NDT because the area is inaccessible (Background)."}},"importantCases":[],"_links":{"self":"/api/acts/ad-sf340-89-nacelle-internal-structure","history":"/api/acts/ad-sf340-89-nacelle-internal-structure/history","analysis":"/api/acts/ad-sf340-89-nacelle-internal-structure/analysis","conflicts":"/api/acts/ad-sf340-89-nacelle-internal-structure/conflicts","importantCases":"/api/acts/ad-sf340-89-nacelle-internal-structure/important-cases","documents":"/api/acts/ad-sf340-89-nacelle-internal-structure/documents"}}