{"id":"F2006B08866","name":"AD/DH 104/24 - Flap Datum Hinge Safety Washer - Inspection","slug":"ad-dh-104-24-flap-datum-hinge-safety-washer-inspection","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":52066,"registerId":"commonwealth-F2006B08866-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/DH 104/24 - Flap Datum Hinge Safety Washer - 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)  DH 104 (Dove) Series Aeroplanes\n\n \n\nAD/DH 104/24 Flap Datum Hinge Safety Washer - Inspection 6/70\n\nApplicability: All models.\n\n \n\nDocument: Hawker Siddeley TNS CT(104) No. 218. Compliance:  Forthwith.\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\n \n","sortOrder":0}],"analysis":{"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The provided text gives no indication that the scope has been altered from any prior instrument. The directive states applicability to all DH 104 models and requires inspection forthwith; it does not reference amendments, supersessions, or narrower/expanded applicability compared with earlier material. Because no earlier version or comparative text is provided here, there is no evidence within this instrument that the scope has changed."},"complexity_factors":["Very short and narrowly targeted directive limited to a single component (flap datum hinge safety washer).","Immediate compliance requirement ('Forthwith') increases operational urgency despite brief text.","Procedural details and inspection methodology are not included in the AD text and are delegated to the referenced Hawker Siddeley document, requiring operators to locate and follow an external document.","No explicit remediation steps, acceptable criteria, or enforcement procedures in the text increases reliance on external guidance and operator judgment.","Applicability is broad (all DH 104 models) but the directive does not differentiate by configuration or usage, which may create implementation questions for different operators."],"plain_english_summary":"This AD requires operators of all DH 104 (Dove) aeroplanes to carry out an immediate inspection of the flap datum hinge safety washer, following Hawker Siddeley TNS CT(104) No. 218. Compliance is mandatory forthwith; operators (and their maintenance providers) bear the cost and must obtain and follow the referenced technical note to meet the requirement."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, single-issue Airworthiness Directive issued in 1970 (as indicated by \"6/70\"). It has not expanded beyond its original narrow purpose of addressing a specific mechanical defect in the DH 104 Dove flap system. ADs are inherently narrow in scope by design — they target specific aircraft types and specific defects."},"complexity_factors":["Extremely short document (under 150 words)","No defined terms section — all terms are standard aviation terminology","No cross-references to other legislation beyond the enabling regulation (Civil Aviation Regulations 1998, Part 39)","Single, unconditional requirement: inspect the safety washer immediately","No exceptions, exemptions, or conditional logic","Simple structure: applicability → document reference → compliance deadline"],"plain_english_summary":"**What this is:** This is an **Airworthiness Directive (AD)** — a mandatory safety order issued by Australia's Civil Aviation Safety Authority (CASA) under the Civil Aviation Regulations 1998.\n\n**What it does:** It requires an immediate inspection of the **flap datum hinge safety washer** on all models of the **DH 104 (Dove) series aircraft**.\n\n**Who it affects:** Anyone who owns, operates, or maintains a DH 104 Dove aircraft — a British twin-engine airliner from the 1940s-50s still flying in Australia.\n\n**Why it matters:** The \"flap datum hinge\" is part of the wing flap system (the moving surfaces on the wing that help with takeoff and landing). The \"safety washer\" is a small but critical component that prevents the hinge from failing. If this washer is missing or damaged, the flaps could malfunction — potentially causing loss of control during landing or takeoff.\n\n**What must be done:**\n- **Compliance:** \"Forthwith\" — meaning immediately, before the next flight.\n- **Reference document:** Hawker Siddeley TNS CT(104) No. 218 (the manufacturer's technical notice specifying exactly how to inspect and fix the issue).\n\n**The bottom line:** This is a classic aviation safety directive — short, urgent, and highly specific. It doesn't change the law broadly; it simply mandates a one-off safety check for a particular vintage aircraft type to prevent mechanical failure."}},"importantCases":[],"_links":{"self":"/api/acts/ad-dh-104-24-flap-datum-hinge-safety-washer-inspection","history":"/api/acts/ad-dh-104-24-flap-datum-hinge-safety-washer-inspection/history","analysis":"/api/acts/ad-dh-104-24-flap-datum-hinge-safety-washer-inspection/analysis","conflicts":"/api/acts/ad-dh-104-24-flap-datum-hinge-safety-washer-inspection/conflicts","importantCases":"/api/acts/ad-dh-104-24-flap-datum-hinge-safety-washer-inspection/important-cases","documents":"/api/acts/ad-dh-104-24-flap-datum-hinge-safety-washer-inspection/documents"}}