{"id":"F2006B11327","name":"AD/MSR/28 Amdt 1 - Horizontal Stabilizer Spar and Attachment Fittings","slug":"ad-msr-28-amdt-1-horizontal-stabilizer-spar-and-attachment-fittings","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":57186,"registerId":"commonwealth-F2006B11327-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/MSR/28 Amdt 1 - Horizontal Stabilizer Spar and Attachment Fittings","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)  \nAerospatiale Rallye Series Aeroplanes\n\nAD/MSR/28\n\nAmdt 1\n\n  \nHorizontal Stabilizer Spar and Attachment Fittings 5/87\n\nApplicability: All models MS 880 B, MS 880 B-D, MS 885, MS 881, MS 883, 100 ST-D, 150 ST,\n\n150 ST-D, 150 T, 150 T-D, 180 T, 180 TS, 180 T-D, 150 SV, 150 SVS, 110 ST, MS\n\n890 A, MS 890 B, MS 892 A 150, MS 892 B 150, MS 892 E 150, MS 892 E-D 150,\n\nMS 893 A, MS 893 B, MS 893 E, MS 893 E-D, MS 894 A, MS 894 C, MS 894 E,\n\nRallye 235 E, 235 E-D, 235 A, R 235 F, 235 C.\n\nRequirement: Action in accordance with Rallye SB No. 145/1.\n\nCompliance: Within 100 hours time in service after 30 April 1986 or at the next scheduled inspection for Maintenance Release issue after 30 April 1986 whichever is the later and thereafter at each scheduled inspection for Maintenance Release issue.\n\nBackground: The manufacturer reports cracking of the forward attachment fittings and spar.\n\nThis amendment references Revision 1 of Rallye SB 145 and introduces a repetitive inspection requirement.","sortOrder":0}],"analysis":{"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":true,"description":"Amendment 1 updates the referenced Service Bulletin to Revision 1 and introduces a repetitive inspection requirement for the forward attachment fittings and spar, converting the directive from a one-off action (as originally issued) into a recurring maintenance obligation."},"complexity_factors":["Wide list of affected models increases tracking and fleet-level compliance effort.","Timing rule: \"Within 100 hours time in service after 30 April 1986 or at the next scheduled inspection for Maintenance Release issue whichever is the later\" requires calendar and TIS coordination.","Ongoing/repetitive inspections: \"and thereafter at each scheduled inspection for Maintenance Release issue\" creates recurring compliance and record-keeping obligations.","Action delegated to an external document: compliance must be done \"in accordance with Rallye SB No. 145/1 (Rev.1)\", so technical steps depend on that service bulletin.","Safety-critical component (forward attachment fittings and spar): finding cracking can trigger parts, labour and grounding costs for repairs.","Potential interpretive friction for maintenance organisations over scheduling language and what constitutes the next Maintenance Release inspection."],"plain_english_summary":"Mandates repetitive inspections of the horizontal stabilizer forward spar and attachment fittings on specified Aerospatiale Rallye aircraft, to be carried out in accordance with Rallye Service Bulletin No. 145/1 (Rev. 1). It applies to the listed models and requires inspection within 100 hours time-in-service after 30 April 1986 or at the next scheduled Maintenance Release inspection (whichever is later), and then at every subsequent scheduled Maintenance Release inspection. The manufacturer reported cracking; operators must perform recurring checks and bear inspection and repair costs to maintain airworthiness."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":true,"description":"The original AD/MSR/28 likely required a one-time inspection. This amendment expands the scope by introducing a repetitive inspection requirement ('thereafter at each scheduled inspection'), making this an ongoing airworthiness obligation rather than a single compliance action. This significantly extends the regulatory burden over the aircraft's remaining service life."},"complexity_factors":["Very short document (under 300 words)","Only 4 defined structural elements: applicability list, requirement reference, compliance deadline, and background","Single cross-reference to external technical document (Rallye SB No. 145/1)","Simple conditional logic: 'whichever is the later' for timing","No nested exceptions or subordinate legislation references","Plain language background explanation included"],"plain_english_summary":"This AD mandates inspections and repairs on Aerospatiale Rallye light aircraft because cracking was found in the forward attachment fittings and spar of the horizontal stabilizer, which could cause catastrophic tail failure. Owners/operators must follow Rallye Service Bulletin No. 145/1, carry out an initial check within 100 flight hours after 30 April 1986 (or at the next maintenance) and perform repetitive inspections at each scheduled maintenance. It affects all listed Rallye operators and maintainers."}},"importantCases":[],"_links":{"self":"/api/acts/ad-msr-28-amdt-1-horizontal-stabilizer-spar-and-attachment-fittings","history":"/api/acts/ad-msr-28-amdt-1-horizontal-stabilizer-spar-and-attachment-fittings/history","analysis":"/api/acts/ad-msr-28-amdt-1-horizontal-stabilizer-spar-and-attachment-fittings/analysis","conflicts":"/api/acts/ad-msr-28-amdt-1-horizontal-stabilizer-spar-and-attachment-fittings/conflicts","importantCases":"/api/acts/ad-msr-28-amdt-1-horizontal-stabilizer-spar-and-attachment-fittings/important-cases","documents":"/api/acts/ad-msr-28-amdt-1-horizontal-stabilizer-spar-and-attachment-fittings/documents"}}