{"id":"F2006B08938","name":"AD/DH114/28 - Flap Datum Hinge Safety Washer - Inspection","slug":"ad-dh114-28-flap-datum-hinge-safety-washer-inspection","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":52538,"registerId":"commonwealth-F2006B08938-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/DH114/28 - 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)  DH114 (Heron) Series Aeroplanes\n\n \n\nAD/DH114/28 Flap Datum Hinge Safety Washer - Inspection NK\n\nApplicability: All models.\n\n \n\nDocument: Hawker Siddeley TNS Heron (114) No. CF.13. 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":2,"scope_assessment":{"changed":false,"description":"The AD text presents a straightforward inspection requirement applicable to all DH114 models with immediate compliance and a reference to document CF.13. There is no information in the text indicating that the scope has been changed from an earlier or original intent; the AD simply prescribes inspection for the identified component and delegates technical detail to the referenced document."},"complexity_factors":["Very short, single-issue directive (inspection only).","Applies to all models but provides no technical procedure within the AD text.","Relies on an external document (Hawker Siddeley TNS Heron (114) No. CF.13) for inspection details.","Immediate compliance requirement ('Forthwith') creates scheduling urgency despite missing procedural detail.","No stated risk assessment, corrective-action criteria, or cost information in the AD itself."],"plain_english_summary":"# What this instrument does\n\nThis is an Airworthiness Directive (AD) issued under the Civil Aviation Regulations (Part 39) that requires an inspection of the flap datum hinge safety washer on DH114 (Heron) series aeroplanes. Mechanically, the AD: \n\n- mandates inspection of the flap datum hinge safety washer; (see: \"AD/DH114/28 Flap Datum Hinge Safety Washer - Inspection NK\")\n- applies to all DH114 (Heron) models (see: \"Applicability: All models.\"); and\n- requires compliance immediately (see: \"Compliance: Forthwith.\").\n\nThe AD refers to a procedural document for the inspection: Hawker Siddeley TNS Heron (114) No. CF.13 (see: \"Document: Hawker Siddeley TNS Heron (114) No. CF.13\").\n\n# Who this affects and who decides\n\n- The directive applies to all owners/operators of DH114 (Heron) series aeroplanes because the applicability line covers all models (\"Applicability: All models.\").\n- The issuing authority is the Civil Aviation Safety Authority, under the Commonwealth Civil Aviation Regulations, Part 39 (header: \"COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES\").\n\n# Practical effects, incentives and costs (mechanical description)\n\n- Responsibility to act: Operators or owners of affected aeroplanes must arrange for or carry out the inspection, because the AD imposes a compliance obligation (\"Compliance: Forthwith.\").\n- Compliance timing: The instruction to comply \"forthwith\" creates an immediate time pressure to schedule the inspection.\n- Required procedure reference: The AD points to Hawker Siddeley TNS Heron (114) No. CF.13 for the inspection procedure; the AD text itself does not set out step‑by‑step technical actions (see: \"Document: ... No. CF.13\").\n- Costs and resources: The AD text does not state costs, parts, or man‑hours; however, compliance will involve use of maintenance labour and any parts or follow‑up work identified by the inspection (the AD requires inspection but does not specify cost or supply arrangements).\n- Enforcement and discretion: The AD is issued within the Part 39 schedule of ADs; enforcement and any determination about adequate compliance rest with the aviation safety authority named in the header.\n\n# What the AD does not state\n\n- The AD text does not set out the technical inspection steps, acceptance criteria, or corrective actions; those details are delegated to the referenced document CF.13 (see: \"Document: ... No. CF.13\").\n- The AD does not provide a background statement, risk assessment, or explanation of the incident/defect that prompted the inspection requirement.\n\n# Trade‑offs, implementation risks and compliance burden (source‑grounded)\n\n- Trade‑offs: The directive creates an immediate compliance requirement for all affected aeroplanes, which trades operator time and maintenance resources against the intended safety check. (Cited: \"Applicability: All models.\" and \"Compliance: Forthwith.\")\n- Implementation risk: Because the AD text omits procedural details and refers to an external document (CF.13), correct execution depends on access to and proper application of that document and on the maintenance organisation's interpretation.\n- Compliance burden concentration: The burden (time, parts, labour) falls on the set of DH114 operators/owners; the AD itself does not identify any compensating funding or supply arrangements.\n\n# Short technical note\n\n- The AD title identifies the affected part as the \"flap datum hinge safety washer,\" but the instrument provides no technical explanation or failure history within its text. Detailed inspection steps and criteria are contained in the referenced document CF.13 (see: \"Document: ... No. CF.13\")."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, single-issue safety directive targeting one specific mechanical component on one aircraft type. It represents the standard, narrow scope of individual Airworthiness Directives, which are designed to address specific unsafe conditions as they are discovered. There is no evidence of scope creep beyond the original safety purpose."},"complexity_factors":["Extremely short document (approximately 150 words)","No defined terms section — uses standard aviation terminology only","No cross-references to other legislation beyond the enabling Civil Aviation Regulations 1998","Single, unambiguous operative requirement (inspect the safety washer)","No conditional logic, exceptions, or alternative compliance methods stated","Simple structure: applicability → document reference → compliance deadline"],"plain_english_summary":"This is an **Airworthiness Directive (AD)** — essentially a mandatory safety order — issued by Australia's Civil Aviation Safety Authority (CASA) for a specific type of aircraft.\n\n**What it does:**\n- Requires an **inspection of the flap datum hinge safety washer** on all DH114 (Heron) series aeroplanes.\n- A \"flap datum hinge\" is part of the wing flap system (the moving surfaces on wings that help control lift during takeoff and landing). The \"safety washer\" is a small but critical component that prevents the hinge from failing.\n\n**Who it affects:**\n- Owners and operators of **all models** of the DH114 Heron aircraft — a British-built twin-engine airliner from the 1950s, now mostly used in charter, freight, or heritage aviation.\n\n**Why it matters:**\n- **Immediate compliance required** (\"Forthwith\" means right away, before further flight if possible).\n- The safety washer inspection is likely prompted by a discovered defect, wear pattern, or incident that could lead to flap failure — potentially causing loss of control during critical flight phases.\n- Non-compliance grounds the aircraft (it's illegal to fly without complying with an AD).\n\n**Key details:**\n- **Reference document:** Hawker Siddeley Technical Note CF.13 (the manufacturer's official instruction).\n- **Compliance:** Immediate — no grace period.\n- **Identifier:** AD/DH114/28 — the 28th AD issued for this aircraft type."}},"importantCases":[],"_links":{"self":"/api/acts/ad-dh114-28-flap-datum-hinge-safety-washer-inspection","history":"/api/acts/ad-dh114-28-flap-datum-hinge-safety-washer-inspection/history","analysis":"/api/acts/ad-dh114-28-flap-datum-hinge-safety-washer-inspection/analysis","conflicts":"/api/acts/ad-dh114-28-flap-datum-hinge-safety-washer-inspection/conflicts","importantCases":"/api/acts/ad-dh114-28-flap-datum-hinge-safety-washer-inspection/important-cases","documents":"/api/acts/ad-dh114-28-flap-datum-hinge-safety-washer-inspection/documents"}}