{"id":"F2006B07067","name":"AD/SM-205/9A - Wing Rear Spar - Inspection and Modification","slug":"ad-sm-205-9a-wing-rear-spar-inspection-and-modification","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":48815,"registerId":"commonwealth-F2006B07067-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/SM-205/9A - Wing Rear Spar - Inspection and Modification","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)  SIAI Marchetti S205 and S208 Series Aeroplanes\n\n \n\nAD/SM- 205/9A\n\n\nWing Rear Spar - Inspection and Modification 2/72\n\n \n\nApplicability: All models S.205 and S.208. Document:  SIAI Marchetti SB No. 205B42. Compliance:               Unless already accomplished:\n\n1. Inspect within 25 hours time in service after 12 February 1976 and thereafter at intervals not exceeding 25 hours time in service until modified.\n\n\n \n\n2.    Unless already accomplished, modify within 200 hours time in service after 12 February 1976.\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 discrete, targeted safety directive addressing a specific airworthiness issue in specific aircraft. It has not expanded beyond its original purpose of mandating inspection and modification of wing rear spars in SIAI Marchetti S205/S208 aircraft."},"complexity_factors":["Very short document (under 200 words)","Only 2 substantive compliance requirements","No defined terms section","No cross-references to other legislation beyond the parent Civil Aviation Regulations 1998","Simple conditional logic ('unless already accomplished')","Single applicability criterion (aircraft model)","Clear, unambiguous deadlines based on flight hours"],"plain_english_summary":"This is an **Airworthiness Directive** — a mandatory safety order issued by Australia's Civil Aviation Safety Authority (CASA). It applies to specific Italian-made aircraft: the **SIAI Marchetti S.205 and S.208 series** (light, single-engine planes).\n\n**What it requires:**\n- **Inspection:** Owners must check the **wing rear spar** (a critical structural beam that helps hold the wing to the fuselage) within 25 hours of flying time after 12 February 1976, then re-inspect every 25 flight hours until a modification is done.\n- **Modification:** The aircraft must be permanently modified to fix the spar issue within 200 flight hours after 12 February 1976.\n\n**Why it matters:**\nThis directive addresses a potential structural failure risk. If the rear spar cracks or fails, the wing could separate from the aircraft with catastrophic results. The tight inspection interval (every 25 hours) suggests a serious safety concern requiring urgent attention until a permanent fix is installed.\n\n**Who must comply:**\nAnyone operating, maintaining, or owning these specific aircraft models in Australia. Non-compliance is illegal and grounds for grounding the aircraft."},"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":false,"description":"The provided text contains a single AD (AD/SM-205/9A) and does not include a prior version or an explicit statement that the scope has been altered from an earlier instrument. The AD’s operative scope is set out here (Applicability; Compliance 1–2). The phrase \"Unless already accomplished\" indicates some operators may already have complied, but the document does not state that scope has changed from an original intent or earlier AD."},"complexity_factors":["Narrow applicability (all S.205 and S.208 models) simplifies target population (Applicability).","Two clear mandatory actions with specific deadlines reduce ambiguity (Compliance 1–2).","Short inspection interval (every 25 hours) adds operational scheduling complexity for operators (Compliance 1).","Reference to an external manufacturer service bulletin (SIAI Marchetti SB No. 205B42) requires access to and reliance on that document for technical compliance (Document line).","\"Unless already accomplished\" requires record checks to confirm prior compliance, adding administrative steps.","Issued as an Airworthiness Directive under Part 39 (header), so compliance is regulatory rather than advisory."],"plain_english_summary":"What this instrument requires (mechanics)\n\n- Applicability: All SIAI Marchetti S.205 and S.208 aircraft (Applicability line).\n- It refers operators to SIAI Marchetti Service Bulletin No. 205B42 (Document line) for the technical procedure.\n- Two required actions (Compliance):\n  1. Inspect the wing rear spar within 25 hours time-in-service after 12 February 1976, and then repeat the inspection at intervals not exceeding 25 hours time-in-service until the modification has been done (Compliance 1).\n  2. Perform the specified modification to the wing rear spar within 200 hours time-in-service after 12 February 1976, unless that modification has already been completed (Compliance 2).\n\nWho is affected and who decides\n\n- Aircraft owners and operators of S.205 and S.208 aeroplanes must carry out the inspections and the modification (Applicability; Compliance 1–2).\n- The action is issued as an Airworthiness Directive under the Commonwealth Civil Aviation Regulations (header: PART 39, Schedule of Airworthiness Directives), so the regulatory requirement comes from the Civil Aviation Safety Authority apparatus as reflected by the AD.\n\nWho pays and what behaviour changes\n\n- The owners/operators pay for inspection labour, any parts, and the modification work. They must schedule repeated short-interval inspections (every 25 hours of flight time) until the modification is completed, and arrange the modification within 200 hours of flight time counted from the specified date (Compliance 1–2).\n- Aircraft already inspected or modified before the effective dates are not required to repeat those steps (text: \"Unless already accomplished\").\n\nImplementation mechanics, incentives and trade-offs\n\n- The AD creates an immediate recurring maintenance obligation (25‑hour inspection cycle) that stops only when the modification is done (Compliance 1). That generates ongoing operating cost and potential downtime until the one-time modification is completed.\n- The modification deadline (200 hours time in service after 12 February 1976) concentrates the cost into an operational window; operators must plan to take aircraft out of service for the modification before that flight-time limit is reached (Compliance 2).\n- The technical details and the method to comply are set out in the manufacturer’s service bulletin (SIAI Marchetti SB No. 205B42). Compliance therefore depends on access to the bulletin’s procedures, parts and any specialised labour it requires (Document line).\n- The wording \"Unless already accomplished\" reduces duplicate work for operators who completed the inspection or modification previously, but it requires operators to establish and rely on maintenance records to show prior compliance.\n\nCompliance burden and discretion\n\n- The AD prescribes firm time-limits (25‑hour inspection interval; 200‑hour modification deadline) rather than open-ended recommendations, which fixes the minimum maintenance burden and scheduling constraint for operators (Compliance 1–2).\n- The text contains no procedural exceptions or alternative compliance paths within the AD itself; compliance is defined by reference to the service bulletin (Document line).\n\nImmediate operational consequences and implementation risks\n\n- Operators must allocate maintenance resources (workshop time and personnel) to meet frequent inspections and to perform the modification within the stated hours; availability of parts or specialised labour referenced by the service bulletin could affect scheduling and aircraft availability.\n- Because the AD applies to all S.205 and S.208 models, the cost and operational impact are spread across all operators of those types rather than targeted to particular serials or configurations (Applicability line).\n\nSource citations: Applicability line; Document line (SIAI Marchetti SB No. 205B42); Compliance paragraphs 1 and 2."}},"importantCases":[],"_links":{"self":"/api/acts/ad-sm-205-9a-wing-rear-spar-inspection-and-modification","history":"/api/acts/ad-sm-205-9a-wing-rear-spar-inspection-and-modification/history","analysis":"/api/acts/ad-sm-205-9a-wing-rear-spar-inspection-and-modification/analysis","conflicts":"/api/acts/ad-sm-205-9a-wing-rear-spar-inspection-and-modification/conflicts","importantCases":"/api/acts/ad-sm-205-9a-wing-rear-spar-inspection-and-modification/important-cases","documents":"/api/acts/ad-sm-205-9a-wing-rear-spar-inspection-and-modification/documents"}}