{"id":"F2006B11064","name":"AD/LA-4/13 - Wing Rear Spar Fittings - Inspection","slug":"ad-la-4-13-wing-rear-spar-fittings-inspection","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":56697,"registerId":"commonwealth-F2006B11064-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/LA-4/13 - Wing Rear Spar Fittings - 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)  \nConsolidated Aeronautics, Colonial and LA-4 Series Aeroplanes\n\nAD/LA-4/13 Wing Rear Spar Fittings \\- Inspection 12/74\n\nApplicability: All Colonial Models C-1 and C-2.\n\nRequirement: To prevent operation with cracked or failed wing rear spar fittings or wing rear spar fittings with distorted bolt holes, accomplish the following:\n\n    Remove the cover compartment containing the aileron control system, located behind the fuel tank area and visually inspect the wing rear spar LH and RH fore fittings P/Ns 3200-151L and 3200-151R, for cracks, failures or distorted bolt holes.\n\n    2. Remove the baggage compartment and visually inspect the wing rear spar LH and RH aft fittings, P/Ns 3200-148L and 3200-148R, for cracks, failures or distorted bolt holes.\n\nCompliance: Within 10 hours time in service after 18 December 1974 and there- after at intervals not exceeding 100 hours time in service.","sortOrder":0}],"analysis":{"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The directive's operational scope remains aligned with its stated objective: require inspections of specified wing rear spar fore and aft fittings on Colonial Models C-1 and C-2 to prevent operation with cracked or distorted fittings. The instrument does not expand or narrow applicability beyond those models or change the specified inspection actions and intervals set out in the Requirement and Compliance sections."},"complexity_factors":["Narrow applicability limited to Colonial Models C-1 and C-2 reduces scope complexity (Applicability).","Prescriptive, simple tasks: two visual inspections tied to specific compartments and part numbers (Requirement).","Clear compliance timing: initial within 10 hours after a date, then every 100 hours, which simplifies scheduling but creates recurring obligations (Compliance).","Lack of detailed acceptance criteria or mandated qualification for the inspector increases implementation uncertainty and administrative ambiguity (Requirement).","Physical access requirements (removing cover and baggage compartments) create practical variation in labour/time depending on aircraft condition and maintenance setup.","No repair methods or disposition criteria specified for detected defects, so follow-on costs and procedures are open-ended."],"plain_english_summary":"This directive requires owners/operators of Colonial (Consolidated Aeronautics) LA-4 series aeroplanes (Models C‑1 and C‑2) to perform recurring visual inspections of the wing rear spar fittings (specified part numbers), with an initial check within 10 hours after 18 Dec 1974 and repeats every 100 hours.\n\nIt aims to prevent operation with cracked or failed fittings; compliance imposes inspection, downtime and repair costs on operators and work for maintenance providers."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, targeted safety directive addressing a specific airworthiness concern on specific aircraft models. It has not expanded beyond its original purpose of mandating recurring inspections for wing spar fitting integrity."},"complexity_factors":["Single, specific applicability (two aircraft models only)","Clear, unambiguous compliance deadline (10 hours after effective date, then 100-hour intervals)","Straightforward inspection procedure with specific part numbers and locations","No cross-references to other legislation or regulations beyond the enabling Civil Aviation Regulations 1998","No defined terms section or interpretive provisions","Single requirement with no exceptions, exemptions, or conditional logic"],"plain_english_summary":"This is an **Airworthiness Directive** — a mandatory safety order issued by Australia's aviation safety regulator (CASA) requiring owners of specific light aircraft to inspect critical wing components for dangerous cracks or damage.\n\n**What it does:**\n- Requires visual inspections of **wing rear spar fittings** — metal brackets that connect the wing structure to the fuselage — on two specific aircraft models: the Colonial C-1 and C-2 (also known as the Consolidated Aeronautics/Lake Amphibian LA-4 series).\n- These fittings are identified by part numbers: 3200-151L/R (forward fittings) and 3200-148L/R (aft fittings).\n\n**Who must comply:**\n- Owners and operators of all Colonial C-1 and C-2 aircraft.\n\n**What must be done:**\n- **First inspection:** Within 10 hours of flying time after 18 December 1974.\n- **Ongoing inspections:** Every 100 hours of flight time thereafter.\n- **How:** Remove specific interior panels (aileron control cover and baggage compartment) to visually check for cracks, failures, or distorted bolt holes in these critical structural fittings.\n\n**Why it matters:**\nCracked or failed wing spar fittings could cause **structural failure of the wing attachment** — potentially leading to wing separation in flight. This directive prevents catastrophic accidents by catching fatigue damage before it becomes critical."}},"importantCases":[],"_links":{"self":"/api/acts/ad-la-4-13-wing-rear-spar-fittings-inspection","history":"/api/acts/ad-la-4-13-wing-rear-spar-fittings-inspection/history","analysis":"/api/acts/ad-la-4-13-wing-rear-spar-fittings-inspection/analysis","conflicts":"/api/acts/ad-la-4-13-wing-rear-spar-fittings-inspection/conflicts","importantCases":"/api/acts/ad-la-4-13-wing-rear-spar-fittings-inspection/important-cases","documents":"/api/acts/ad-la-4-13-wing-rear-spar-fittings-inspection/documents"}}