{"id":"F2006B07002","name":"AD/SF340/72 - MLG Hydraulic Swivel Brackets","slug":"ad-sf340-72-mlg-hydraulic-swivel-brackets","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":48630,"registerId":"commonwealth-F2006B07002-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/SF340/72 - MLG Hydraulic Swivel Brackets","content":"---\nmeta-content-style-type: text/css\nmeta-content-type: application/xhtml+xml; charset=utf-8\nmeta-generator: Aspose.Words for .NET 22.10.0\n---\n\n?xml version=\"1.0\" encoding=\"utf-8\" standalone=\"no\"?>\n\nCOMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY\n\nSCHEDULE OF AIRWORTHINESS DIRECTIVES\n\n \n\n![](image.001.png)  SAAB SF340 Series Aeroplanes\n\n \n\nAD/SF340/72 MLG Hydraulic Swivel Brackets 10/99\n\nApplicability: Model SF340A aircraft, serial numbers 004 through 159, and Model 340B aircraft, serial numbers 160 through 339.\n\n \n\nRequirement: Action in accordance with SAAB Aircraft AB Mandatory Service Bulletin 340-29- 009 Revision 2, dated 2 July 1999.\n\n \n\nNote: LFV AD 1-145 refers.\n\n \n\nCompliance: Before 2 July 2000.\n\n \n\nThis Airworthiness Directive becomes effective on 7 October 1999.\n\n \n\nBackground: A misalignment of the downlock or brake swivels in the main landing gear dragbrace and shock strut trunnions has, due to excessive loads during extension/retraction of the landing gear, resulted in abnormally high failure rate of the hydraulic swivels; and subsequent loss of hydraulic systems.\n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n","sortOrder":0}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, targeted safety directive addressing a specific mechanical defect in a specific aircraft type. It has not expanded beyond its original purpose of mandating repairs to prevent hydraulic swivel bracket failures."},"complexity_factors":["Single, specific mechanical issue addressed (hydraulic swivel bracket misalignment)","Clear applicability criteria limited to specific aircraft models and serial number ranges","Single compliance action referencing an external technical document (SAAB Service Bulletin)","No nested exceptions, conditional logic, or alternative compliance methods","Straightforward deadline (calendar date, not flight hours or cycles)","Minimal defined terms (only 'Applicability', 'Requirement', 'Compliance', 'Background')","No cross-references to other legislation beyond a note about a Swedish aviation authority directive (LFV AD 1-145)"],"plain_english_summary":"This CASA Airworthiness Directive mandates owners/operators of SAAB 340A (serials 004–159) and 340B (160–339) inspect and repair misaligned main landing gear hydraulic swivel brackets per SAAB Service Bulletin 340-29-009 Revision 2 (2 July 1999), with work required before 2 July 2000. It addresses bracket misalignment that caused swivel failures and potential hydraulic system loss, preventing brake, flight‑control or gear failures."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The text does not indicate any change to the AD's original scope. It applies only to the listed SF340A/340B serial numbers and mandates compliance with the Saab service bulletin by the specified date; no expansion or narrowing of applicability is stated."},"complexity_factors":["Narrow applicability defined by specific serial-number ranges (Applicability).","Technical remedy is specified by an external document: Saab Mandatory Service Bulletin 340-29-009 Revision 2 (Requirement), creating dependency on that bulletin for instructions.","Firm compliance deadline and stated effective date impose scheduling and operational downtime constraints (Compliance / Effective date).","Safety-critical subject matter (main landing gear hydraulic swivels) with potential operational impact if not corrected (Background).","Reference to a foreign authority AD (LFV AD 1-145) introduces potential cross-jurisdictional alignment considerations (Note).","Enforcement and legal effect flow from the Civil Aviation Safety Authority instrument framing (top matter)."],"plain_english_summary":"This Airworthiness Directive requires operators of Saab SF340A (serial numbers 004–159) and 340B (160–339) aircraft to carry out the actions set out in Saab Mandatory Service Bulletin 340‑29‑009 Revision 2 (dated 2 July 1999) on the main landing gear hydraulic swivel brackets. Compliance must be completed before 2 July 2000; the AD became effective 7 October 1999.\n\nThe AD responds to repeated hydraulic swivel failures caused by misalignment of downlock/brake swivels; the cost, parts and maintenance time required to comply fall on the aircraft operators, who must follow the service bulletin and meet the compliance date."}},"importantCases":[],"_links":{"self":"/api/acts/ad-sf340-72-mlg-hydraulic-swivel-brackets","history":"/api/acts/ad-sf340-72-mlg-hydraulic-swivel-brackets/history","analysis":"/api/acts/ad-sf340-72-mlg-hydraulic-swivel-brackets/analysis","conflicts":"/api/acts/ad-sf340-72-mlg-hydraulic-swivel-brackets/conflicts","importantCases":"/api/acts/ad-sf340-72-mlg-hydraulic-swivel-brackets/important-cases","documents":"/api/acts/ad-sf340-72-mlg-hydraulic-swivel-brackets/documents"}}