{"id":"F2006B07597","name":"AD/W620/2 - Wing Hinge Pins","slug":"ad-w620-2-wing-hinge-pins","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":50264,"registerId":"commonwealth-F2006B07597-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/W620/2 - Wing Hinge Pins","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)  \nWeatherly 620 Series Aeroplanes\n\n![](image.002.png)10/96 TLX\n\nRequirement: Inspect all four P/N 40852-001 wing hinge pins which join the main spar of the wing to the centre section.\n\nInspect the depth of the threaded end, the overall length, and the position of each pin in accordance with Weatherly Aviation Company Service Note No. 15, dated July 17, 1996.\n\nReplace defective pins and re-position mis-aligned pins in accordance with Service Note No. 15 and the aircraft maintenance manual.\n\nNote: FAA AD 96-16-06, issued by Priority Letter on 26 July 1996, refers.\n\nCompliance: Before further flight after the effective date of this directive, which is 2 August 1996.\n\nBackground: The wing hinge pins connect the wings to the fuselage. Some pins may have been made too short; others may have been installed off centre. Either defect could dangerously weaken the wing joint.","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 manufacturing and installation defect in a particular aircraft model. It has not expanded beyond its original purpose of ensuring wing structural integrity for Weatherly 620 series aircraft."},"complexity_factors":["Single, specific mechanical component addressed (wing hinge pins)","Clear, unambiguous compliance deadline ('before further flight')","Only one cross-reference (to FAA AD 96-16-06 for context)","No defined terms section or interpretation provisions","Straightforward conditional logic: inspect → if defective, replace; if misaligned, re-position","Approximately 200 words total","Single aircraft type and part number specified"],"plain_english_summary":"This is an **Airworthiness Directive** — a mandatory safety order issued by Australia's Civil Aviation Safety Authority (CASA) that requires specific repairs or inspections on aircraft.\n\n**What it does:**\nOrders owners and operators of **Weatherly 620 series aeroplanes** to urgently inspect four specific wing hinge pins (part number 40852-001). These pins are critical bolts that attach the wings to the fuselage (main body of the plane).\n\n**The problem:**\nSome of these pins were manufactured too short, and others were installed off-centre. Either defect could dangerously weaken the connection between the wing and the fuselage, potentially causing structural failure.\n\n**What must be done:**\n- **Inspect** all four pins for length, thread depth, and positioning\n- **Follow** the manufacturer's Service Note No. 15 (dated 17 July 1996) for inspection procedures\n- **Replace** any defective pins\n- **Re-position** any misaligned pins\n- **Use** the aircraft maintenance manual for proper installation\n\n**Who it affects:**\nAnyone who owns, operates, or maintains a Weatherly 620 series aircraft.\n\n**When:**\nBefore the aircraft flies again after 2 August 1996.\n\n**Why it matters:**\nThis is an urgent safety fix. Wing attachment failures can be catastrophic. The directive references a matching US Federal Aviation Administration (FAA) order, showing this is a known international safety issue."},"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":false,"description":"The directive prescribes inspection and corrective action for the same set of hinge pins and defects described in its Background and Requirement sections. The text does not indicate an expansion or narrowing of scope from its stated intent: it requires inspection of all four P/N 40852-001 wing hinge pins, specification of inspection criteria, and mandated replacement or repositioning as necessary, with compliance required before further flight (Requirement; Compliance; Background)."},"complexity_factors":["Specificity of required actions: inspection of four identified pins with a single part number (P/N 40852-001) and defined inspection parameters (depth of threaded end, overall length, position). (Requirement)","Clear procedural reference: action must follow Weatherly Aviation Company Service Note No. 15 (17 July 1996) and the aircraft maintenance manual, which reduces interpretive complexity. (Requirement)","Single, immediate compliance deadline: mandatory before further flight after 2 August 1996, creating straightforward timing but operational pressure. (Compliance)","Fixed scope of applicability: applies to Weatherly 620 series aeroplanes and the four hinge pins, limiting the breadth of assessment. (Requirement; Background)","No discretionary or conditional exemptions included in the text; operators must follow the specified steps, reducing regulatory discretion but increasing operational urgency. (Requirement; Compliance)"],"plain_english_summary":"CASA requires owners and operators of Weatherly 620 aeroplanes fitted with wing hinge pins P/N 40852-001 to inspect all four main-spar hinge pins using Weatherly Service Note No.15, checking thread depth, length and position. Defective or misaligned pins must be repaired or replaced per the Service Note and maintenance manual before the aircraft next flies (effective 2 Aug 1996).\n\nThe measure targets pins that may be too short or off‑centre, which could weaken the wing joint; compliance costs and parts sourcing fall to operators and their maintenance providers."}},"importantCases":[],"_links":{"self":"/api/acts/ad-w620-2-wing-hinge-pins","history":"/api/acts/ad-w620-2-wing-hinge-pins/history","analysis":"/api/acts/ad-w620-2-wing-hinge-pins/analysis","conflicts":"/api/acts/ad-w620-2-wing-hinge-pins/conflicts","importantCases":"/api/acts/ad-w620-2-wing-hinge-pins/important-cases","documents":"/api/acts/ad-w620-2-wing-hinge-pins/documents"}}