{"id":"F2006B11314","name":"AD/MSR/16 - Firewall Engine Mount Attachment Fittings - Inspection","slug":"ad-msr-16-firewall-engine-mount-attachment-fittings-inspection","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":57165,"registerId":"commonwealth-F2006B11314-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/MSR/16 - Firewall Engine Mount Attachment Fittings - Inspection","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)  Aerospatiale Rallye Series Aeroplanes\n\n \n\nAD/MSR/16 Firewall Engine Mount Attachment Fittings - Inspection\n\n\n8/71\n\n \n\nApplicability: All models. Document: Rallye SB No. 86.\n\nCompliance: Within 100 hours time in service after 30 September 1971 and there after at intervals not exceeding 100 hours time in service.\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\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 historical airworthiness directive from 1971 (AD/MSR/16, referencing document 8/71). It remains focused on its original narrow purpose: inspecting specific engine mount fittings on one aircraft type. No evidence of scope creep — it has not expanded to cover additional aircraft systems, models, or operational contexts beyond the original safety concern identified in Service Bulletin No. 86."},"complexity_factors":["Extremely short document — approximately 100 words of substantive content","Only one defined term implied ('time in service' — standard aviation term for flight hours)","No cross-references to other legislation beyond the parent Civil Aviation Regulations 1998","Simple binary applicability (all models) with no exceptions or conditional logic","Single compliance pathway with clear deadline and recurring interval","No nested definitions, schedules, or subordinate instruments referenced"],"plain_english_summary":"This is an **Airworthiness Directive** (AD) — essentially a mandatory safety order issued by Australia's Civil Aviation Safety Authority (CASA). It applies to all models of **Aerospatiale Rallye series aeroplanes** (a type of light aircraft).\n\n**What it requires:**\n- **Inspection of firewall engine mount attachment fittings** — these are the metal brackets and bolts that connect the engine to the aircraft's firewall (the protective wall between the engine and the cockpit).\n- **When:** First inspection must happen within 100 hours of flying time after 30 September 1971, then repeated every 100 hours of flying time thereafter.\n\n**Why it matters:**\nThese fittings are critical structural components. If they crack or fail, the engine could detach from the airframe — a catastrophic failure. This AD was issued following a manufacturer's service bulletin (Rallye SB No. 86) that identified a safety risk requiring ongoing monitoring.\n\n**Who must comply:**\nOwners and operators of Aerospatiale Rallye aircraft. Non-compliance means the aircraft is not legally airworthy and cannot fly."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The text explicitly applies the requirement to \"All models\" of the Aerospatiale Rallye series and refers to Rallye SB No. 86 for technical detail (\"Applicability: All models. Document: Rallye SB No. 86.\"). No wording in the supplied instrument narrows or widens that coverage beyond the stated applicability, so the scope has not been changed from what the instrument itself sets out."},"complexity_factors":["Narrow, prescriptive timing: fixed initial and recurrent 100-hour intervals are straightforward to understand but impose recurring scheduling and record-keeping burdens (Compliance line).","Reference to an external technical document (Rallye SB No. 86) to provide procedural detail increases compliance complexity because the directive does not itself contain inspection steps (Applicability line).","No detail in the directive about acceptance criteria, corrective actions, or enforcement; those practical specifics must be obtained from the service bulletin or maintenance authorities, adding interpretive steps.","Vintage dating (compliance triggered after 30 September 1971) introduces a historical compliance anchor that may require reading against operators’ maintenance records (Compliance line).","Applicability covers all models, which simplifies scope determination but increases the number of affected operators and the potential variety of configuration specifics to be resolved via the service bulletin (Applicability line)."],"plain_english_summary":"The directive requires periodic inspection of firewall engine‑mount attachment fittings on all Aerospatiale Rallye aircraft, to be carried out per Rallye Service Bulletin No. 86 — first within 100 hours TIS after 30 Sep 1971 and then every 100 hours. It affects aircraft owners/operators and maintenance organisations, who bear inspection, repair and downtime costs; it matters for structural safety but imposes recurring maintenance and scheduling burdens."}},"importantCases":[],"_links":{"self":"/api/acts/ad-msr-16-firewall-engine-mount-attachment-fittings-inspection","history":"/api/acts/ad-msr-16-firewall-engine-mount-attachment-fittings-inspection/history","analysis":"/api/acts/ad-msr-16-firewall-engine-mount-attachment-fittings-inspection/analysis","conflicts":"/api/acts/ad-msr-16-firewall-engine-mount-attachment-fittings-inspection/conflicts","importantCases":"/api/acts/ad-msr-16-firewall-engine-mount-attachment-fittings-inspection/important-cases","documents":"/api/acts/ad-msr-16-firewall-engine-mount-attachment-fittings-inspection/documents"}}