{"id":"F2006B08924","name":"AD/DH114/14 - Flap Jack Attachment - Modification","slug":"ad-dh114-14-flap-jack-attachment-modification","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":52485,"registerId":"commonwealth-F2006B08924-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/DH114/14 - Flap Jack Attachment - 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)  DH114 (Heron) Series Aeroplanes\n\n \n\nAD/DH114/14 Flap Jack Attachment - Modification NK\n\nApplicability: All Series 1B and 2.\n\n \n\nDocument: De Havilland Mod. New Sheet Heron (114) No. 1498. Compliance: Before 31 January 1963.\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 text specifies a single, time-limited mandatory modification for DH114 Heron Series 1B and 2 aircraft in accordance with a named De Havilland modification sheet and requires completion by 31 January 1963 (Applicability; Document; Compliance). The instrument itself contains no material indicating a change of scope from that stated requirement; therefore there is no evidence in the provided text that the scope has been altered from the instrument's stated applicability and mandate."},"complexity_factors":["Single, concrete requirement: mandates a single modification action (Document).","Clear applicability: limited to all DH114 Series 1B and 2 (Applicability).","Fixed deadline: one compliance date specified (Compliance).","Reference to external technical document: requires following De Havilland Mod New Sheet Heron (114) No. 1498, which must be obtained and followed (Document).","Lack of procedural detail in the directive: no enforcement, exemption, or evidence-of-compliance procedures included, which creates operational uncertainty despite overall simplicity."],"plain_english_summary":"This directive makes a specific De Havilland modification (Mod New Sheet Heron (114) No. 1498) to the flap jack attachment mandatory on DH114 (Heron) Series 1B and Series 2 aircraft, to be completed by 31 January 1963.  \n\nIt binds owners/operators to arrange and pay for the work, converting a discretionary engineering change into a regulatory compliance obligation; the text does not state technical reasons, enforcement, exemptions, or cost recovery."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, single-issue airworthiness directive focused solely on a specific mechanical modification to a specific aircraft type. There is no evidence of scope creep; it addresses exactly what it purports to address — flap jack attachment safety on DH114 Heron aircraft."},"complexity_factors":["Extremely short document — only 4 substantive lines of regulatory text","No defined terms section; all terminology is standard aviation maintenance language","Single, unambiguous applicability clause ('All Series 1B and 2')","No cross-references to other legislation or regulations beyond the enabling authority (Civil Aviation Regulations 1988, Part 39)","Simple binary compliance requirement: perform modification by fixed date or ground aircraft","No conditional logic, exceptions, or alternative compliance methods specified"],"plain_english_summary":"This is an **Airworthiness Directive** (AD) — a mandatory safety order issued by Australia's Civil Aviation Safety Authority (CASA) under the Civil Aviation Regulations 1988.\n\n**What it does:**\n- Requires owners and operators of specific **De Havilland Heron aircraft** (Series 1B and 2 models) to carry out a **modification to the flap jack attachment** — a mechanical component that helps control the aircraft's wing flaps.\n- The modification must be done according to **De Havilland Modification Sheet No. 1498**.\n\n**Who it affects:**\n- Anyone who owns, operates, or maintains a **DH114 Heron Series 1B or 2 aircraft**.\n\n**Why it matters:**\n- Airworthiness Directives are **legally binding safety requirements**. If you don't comply, you cannot legally fly the aircraft.\n- This particular directive addresses a potential safety issue with the flap mechanism — critical for safe takeoff and landing.\n- **Note:** The compliance deadline was **31 January 1963**, meaning this is a **historical directive** that would have been superseded by later regulations for any aircraft still in service today."}},"importantCases":[],"_links":{"self":"/api/acts/ad-dh114-14-flap-jack-attachment-modification","history":"/api/acts/ad-dh114-14-flap-jack-attachment-modification/history","analysis":"/api/acts/ad-dh114-14-flap-jack-attachment-modification/analysis","conflicts":"/api/acts/ad-dh114-14-flap-jack-attachment-modification/conflicts","importantCases":"/api/acts/ad-dh114-14-flap-jack-attachment-modification/important-cases","documents":"/api/acts/ad-dh114-14-flap-jack-attachment-modification/documents"}}