{"id":"F2006B11326","name":"AD/MSR/27 Amdt 1 - Corrosion - Inspection","slug":"ad-msr-27-amdt-1-corrosion-inspection","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":57183,"registerId":"commonwealth-F2006B11326-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/MSR/27 Amdt 1 - Corrosion - Inspection","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/27\n\nAmdt 1\n\n  \nCorrosion \\- Inspection 9/84\n\nApplicability: All model Rallye MS.880B, MS892 and derivatives.\n\nRequirement: 1. Inspect areas detailed in Aerospatiale Service Bulletin No. 133/2 Column A.\n\n2. Should the inspections detailed at Para 1 evidence appreciable spots of corrosion extend inspections to include Column B.\n\nNote: Bureau Veritas AD 82-89(A) refers.\n\nCompliance: Initial inspection within 50 hours time in service after 27 September 1982, and thereafter at intervals not exceeding 100 hours time in service or 4 months, whichever occurs first.\n\nBackground: To ensure the integrity of main structures the manufacturer has detailed specific areas subject to repetitive inspection and treatment. AMDT 1 of this Directive clarifies the inspection requirement and uses the findings of the lesser inspection to determine the need for additional inspection areas.","sortOrder":0}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This amendment remains tightly focused on its original purpose: establishing corrosion inspection requirements for specific Aerospatiale Rallye aircraft. Amendment 1 merely refines the inspection trigger mechanism (making Column B conditional on Column A findings) without expanding to other aircraft types, additional maintenance requirements, or broader regulatory scope."},"complexity_factors":["Very short document (approximately 150 words)","Only 3 defined terms implicitly used (Applicability, Requirement, Compliance)","Simple conditional logic: 'if Column A shows corrosion, then do Column B'","No cross-references to other legislation or regulations (only references a Service Bulletin and another country's airworthiness directive)","Single purpose: inspection requirement for one aircraft type","Clear, sequential structure: applicability → requirement → compliance → background"],"plain_english_summary":"This is an **Airworthiness Directive** (a mandatory safety order) issued by Australia's Civil Aviation Safety Authority for certain French-made Aerospatiale Rallye aircraft models (MS.880B, MS892 and similar variants).\n\n**What it does:**\n- Requires aircraft owners/operators to inspect specific parts of the plane for **corrosion** (rust or deterioration of metal parts)\n- The inspections follow a manufacturer's service bulletin with two levels:\n  - **Column A:** Basic inspection of designated areas\n  - **Column B:** Extended inspection of additional areas—but only if Column A finds \"appreciable spots of corrosion\"\n\n**Who it affects:**\n- Owners and operators of Aerospatiale Rallye MS.880B, MS892 and derivative aircraft models\n- Maintenance engineers performing inspections on these aircraft\n\n**Why it matters:**\n- Corrosion in aircraft structures can weaken the airframe and lead to catastrophic failure\n- This directive creates a two-tier inspection system: a lighter check first, with deeper investigation only if problems are found\n- **Compliance is mandatory:** Initial inspection within 50 flight hours after September 27, 1982, then repeated every 100 flight hours or 4 months (whichever comes first)\n\n**Key change in this version (Amendment 1):**\nThe amendment clarifies that mechanics should use the results from the basic inspection (Column A) to decide whether the more extensive inspection (Column B) is necessary—rather than doing both automatically."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":true,"description":"AMDT 1 clarifies the inspection requirement and introduces a conditional expansion mechanism: initial inspections are limited to the Column A areas specified in the Service Bulletin, and findings of \"appreciable spots of corrosion\" in those areas trigger extended inspections to include Column B. This amendment therefore adjusts the operational scope of inspections by making the broader inspection contingent on inspection outcomes. (Background; Requirement)"},"complexity_factors":["Dependency on an external technical document (Aerospatiale Service Bulletin No. 133/2) for the precise inspection locations","A conditional inspection rule that expands scope if corrosion is found (two-step decision rule)","Time- and usage-based compliance schedule (50 hours initial deadline; 100 hours or 4 months recurrent intervals)","Reference to another airworthiness directive (Bureau Veritas AD 82-89(A)) which may require cross-checking","Limited subject-matter scope (specific aircraft models and corrosion inspection only) which lowers overall complexity"],"plain_english_summary":"Owners and operators of Aerospatiale Rallye MS.880B, MS.892 and derivatives must carry out inspections of specified areas per Aerospatiale Service Bulletin No. 133/2: an initial check within 50 hours TIS after 27 Sept 1982, then every 100 hours TIS or every four months.  \n\nIf inspections reveal \"appreciable spots of corrosion\" in the Column A locations, inspections must be extended to Column B. Operators bear inspection and repair costs; purpose is early detection and treatment of structural corrosion."}},"importantCases":[],"_links":{"self":"/api/acts/ad-msr-27-amdt-1-corrosion-inspection","history":"/api/acts/ad-msr-27-amdt-1-corrosion-inspection/history","analysis":"/api/acts/ad-msr-27-amdt-1-corrosion-inspection/analysis","conflicts":"/api/acts/ad-msr-27-amdt-1-corrosion-inspection/conflicts","importantCases":"/api/acts/ad-msr-27-amdt-1-corrosion-inspection/important-cases","documents":"/api/acts/ad-msr-27-amdt-1-corrosion-inspection/documents"}}