{"id":"F2006B10515","name":"AD/HS 125/74 - Wire Loom Chafe","slug":"ad-hs-125-74-wire-loom-chafe","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":116293,"registerId":"commonwealth-F2006B10515-current","compilationNumber":null,"startDate":"2026-04-03","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/HS 125/74 - Wire Loom Chafe","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)  British Aerospace BAe 125 Series Aeroplanes\n\n \n\nAD/HS 125/74 Wire Loom Chafe 2/86\n\nApplicability: All HS-125 series 400B to 700B (Post Mod. 252049) aeroplanes.\n\n \n\nRequirement: Inspect the area adjacent to the TKS de-icing pump for wire loom chafing damage according to the requirements of British Aerospace 125 S.B. 24-255.\n\n \n\nNote: CAA Airworthiness Directive 005-10-85 refers.\n\n \n\nCompliance: Before 31 March 1986.\n\n \n\nBackground: An instance of wire loom chafing has occurred resulting in arcing and an electrical overheat.\n\n \n","sortOrder":0}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, time-bound safety directive from 1986 with a tightly constrained scope. It addresses a specific technical issue on specific aircraft models and does not represent scope creep from any broader legislative intent."},"complexity_factors":["Single, specific mechanical inspection requirement","Only 4 substantive content sections (Applicability, Requirement, Note, Compliance, Background)","One cross-reference to an external technical document (British Aerospace S.B. 24-255)","One cross-reference to a related UK CAA directive","No defined terms section","No conditional logic or nested exceptions","Extremely narrow scope (single aircraft type, specific modification status, specific physical location)"],"plain_english_summary":"**What this is:** This is an Airworthiness Directive (AD) — essentially a mandatory safety notice issued by Australia's Civil Aviation Safety Authority (CASA). Think of it as a recall notice for aircraft, but with legal force.\n\n**What it does:** It requires owners and operators of specific British Aerospace BAe 125 business jets (models 400B through 700B, but only those that have had a particular modification installed) to inspect a specific area near the TKS de-icing pump for damaged wiring.\n\n**Why:** A wire \"loom\" (a bundle of electrical wires) was found rubbing against something it shouldn't, causing the insulation to wear through. This created sparks (arcing) and overheating — a serious fire risk in an aircraft.\n\n**Who must act:** Anyone operating the affected aircraft models.\n\n**What they must do:** Follow the inspection procedure detailed in British Aerospace Service Bulletin 24-255 to check for chafing damage.\n\n**When:** The inspection had to be completed before 31 March 1986.\n\n**Why it matters:** Electrical fires in aircraft are extremely dangerous. This directive prevents a known safety hazard from causing an accident."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The directive as written confines its scope to HS-125 series 400B–700B aircraft that are post Mod. 252049 and prescribes a one-off inspection per the manufacturer service bulletin. The text does not expand or narrow that scope beyond those explicit applicability and requirement statements (Applicability; Requirement)."},"complexity_factors":["Narrow technical scope limited to HS-125 series 400B–700B post Mod. 252049 (Applicability)","Single prescriptive action (inspect for wire loom chafing) tied to a specific manufacturer service bulletin (Requirement)","Fixed, short compliance deadline (before 31 March 1986) increases operational urgency (Compliance)","Reliance on an external document (British Aerospace Service Bulletin 24-255) for procedural detail","Technical nature of inspection requires skilled maintenance personnel and possible repair (Requirement; Background)","Cross-reference to another authority's directive (CAA AD 005-10-85) introduces secondary interpretive material (Note)"],"plain_english_summary":"This AD mandates a one‑time inspection of the wiring loom adjacent to the TKS de‑icing pump on HS‑125 series 400B–700B aeroplanes modified by Mod. 252049, to be done per British Aerospace Service Bulletin 24‑255 before 31 March 1986. \n\nIt affects owners/operators and maintenance providers, was issued after wiring chafing led to arcing/overheat, and places inspection and any repair costs on aircraft operators."}},"importantCases":[],"_links":{"self":"/api/acts/ad-hs-125-74-wire-loom-chafe","history":"/api/acts/ad-hs-125-74-wire-loom-chafe/history","analysis":"/api/acts/ad-hs-125-74-wire-loom-chafe/analysis","conflicts":"/api/acts/ad-hs-125-74-wire-loom-chafe/conflicts","importantCases":"/api/acts/ad-hs-125-74-wire-loom-chafe/important-cases","documents":"/api/acts/ad-hs-125-74-wire-loom-chafe/documents"}}