{"id":"F2006B08881","name":"AD/DH 104/38 - Flap To Flap Jack Connecting Pin","slug":"ad-dh-104-38-flap-to-flap-jack-connecting-pin","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":52353,"registerId":"commonwealth-F2006B08881-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/DH 104/38 - Flap To Flap Jack Connecting Pin","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 104/38 Flap To Flap Jack Connecting Pin 1/89 DM\n\nApplicability: All models.\n\n \n\nRequirement: Action in accordance with BAe TNS 246 Issue 1. Compliance:  Within seven days time in service after 7 December 1988.\n\nBackground: Incorrectly manufactured pins have been found in service on DH 114 aircraft, one of which caused an in-flight assymetric flap condition. The same pins may have been fitted to DH 104 aircraft.\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 directive does not expand or narrow the legal scope of what aircraft may operate; it imposes a mandatory maintenance action on all DH 104 models to address a suspected manufacturing defect. The instrument’s scope is maintenance compliance for the specified component (Applicability; Requirement; Compliance), not a change to certification or operational rules."},"complexity_factors":["Short, single-prescriptive action: requirement is to follow BAe TNS 246 Issue 1 (Requirement)","Reference to an external technical document (BAe TNS 246) which must be obtained and followed","Tight compliance window: seven days time in service after 7 December 1988 (Compliance)","Fleet-wide applicability to all DH 104 models increases operational coordination needs (Applicability)","Safety-critical nature of the component raises implementation risk if inspections/repairs are delayed (Background)"],"plain_english_summary":"This directive requires all owners/operators of DH.104 (Dove) aircraft to inspect and, if necessary, rectify or replace the flap‑to‑flap jack connecting pin in accordance with BAe TNS 246 Issue 1, within seven days’ time‑in‑service after 7 December 1988. It targets maintenance organisations and engineers, aiming to eliminate pins of the same faulty manufacture found on DH.114 that caused an in‑flight asymmetric flap—trading concentrated operator cost and downtime for reduced safety risk."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, time-limited safety directive from 1989 addressing a specific manufacturing defect. It has not expanded beyond its original narrow purpose of mandating inspection/replacement of a single aircraft component."},"complexity_factors":["Very short document (under 200 words)","Single, unambiguous compliance requirement with clear deadline","Only one defined applicability criterion ('All models')","No cross-references to other legislation or regulations beyond the parent Civil Aviation Regulations 1998","No conditional logic, exceptions, or nested provisions","Single technical reference (BAe TNS 246 Issue 1) — external standard incorporated by reference"],"plain_english_summary":"This is an **Airworthiness Directive** — a mandatory safety order issued by Australia's Civil Aviation Safety Authority (CASA) for aircraft.\n\n**What it does:**\nOrders owners and operators of **DH 104 (Dove) series aeroplanes** to inspect and replace a specific part — the **flap-to-flap jack connecting pin** — within **7 days of flying time** after 7 December 1988.\n\n**Why it matters:**\nSome of these pins were manufactured incorrectly. One such faulty pin caused an **in-flight asymmetric flap condition** on a similar aircraft (the DH 114), meaning the flaps on one wing extended differently from the other — a serious flight safety risk. The same defective pins might have been installed on DH 104 aircraft, so this directive forces a check to prevent potential accidents.\n\n**Who must comply:**\nAnyone operating or maintaining DH 104 (Dove) aircraft — all models are affected.\n\n**How to comply:**\nFollow the technical instructions in **BAe TNS 246 Issue 1** (a British Aerospace technical notice)."}},"importantCases":[],"_links":{"self":"/api/acts/ad-dh-104-38-flap-to-flap-jack-connecting-pin","history":"/api/acts/ad-dh-104-38-flap-to-flap-jack-connecting-pin/history","analysis":"/api/acts/ad-dh-104-38-flap-to-flap-jack-connecting-pin/analysis","conflicts":"/api/acts/ad-dh-104-38-flap-to-flap-jack-connecting-pin/conflicts","importantCases":"/api/acts/ad-dh-104-38-flap-to-flap-jack-connecting-pin/important-cases","documents":"/api/acts/ad-dh-104-38-flap-to-flap-jack-connecting-pin/documents"}}