{"id":"F2006B09204","name":"AD/DHC-8/49 - Inspection of Wiring Harness","slug":"ad-dhc-8-49-inspection-of-wiring-harness","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":53030,"registerId":"commonwealth-F2006B09204-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/DHC-8/49 - Inspection of Wiring Harness","content":"COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 \\- 105 CIVIL AVIATION SAFETY AUTHORITY\n\nSCHEDULE OF AIRWORTHINESS DIRECTIVES\n\n![](image.001.png)  \nBombardier (Boeing Canada/De Havilland) DHC-8 Series Aeroplanes\n\nAD/DHC-8/49 Inspection of Wiring Harness 11/97\n\nApplicability: de Havilland Inc. DHC-8 aircraft, series 100, 200 and 300, serial numbers 003 to 433\n\ninclusive except 031, 408 and 413.\n\nRequirement: Install deHavilland Modification 8/2624, Special Inspection For Chafing Of Cable Harness Behind Lavatory And Cut Away Of Lavatory Forward Panel, in accordance with deHavilland Service Bulletin 8-24-50 dated 25 April 1997.\n\nNote: Transport Canada AD CF-97-14 refers.\n\nCompliance: Unless previously accomplished by 9 July 1998.\n\nThis airworthiness directive becomes effective on 9 October 1997.\n\nBackground: Some operators have reported chafing of electrical wiring at the forward, top, outboard edge of the lavatory side wall resulting in severe local overheat and smoke in the cockpit and cabin. The deHavilland modification 8/2624 provides the means for assessing the condition of the affected wires, repair any damage and reduce the risk of future damage to the wiring harness in the area behind the lavatory and cut away of the lavatory forward panel.","sortOrder":0}],"analysis":{"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The instrument sets a one‑time safety requirement for a defined set of serial numbers to install Modification 8/2624 per Service Bulletin 8‑24‑50. The text contains no indication that the scope has been broadened or otherwise changed from its original stated purpose."},"complexity_factors":["Narrow applicability by serial number (affects only specified DHC‑8 airframes), which simplifies target population but requires individual fleet tracking.","Mandated technical modification (deHavilland Modification 8/2624) and inspection/repair work — requires maintenance personnel, parts and adherence to Service Bulletin 8‑24‑50.","Compliance deadline (9 July 1998) imposes scheduling and operational availability costs on operators.","Instruction references an external technical document (manufacturer service bulletin) and a foreign AD (Transport Canada AD CF‑97‑14), creating dependency on external materials and cross‑jurisdictional alignment.","Physical intervention includes cutting away a lavatory panel and repairing wiring — potential for varied labour time and differing repair complexity across aircraft."],"plain_english_summary":"This airworthiness directive requires operators of specified de Havilland DHC‑8 Series 100/200/300 aircraft (serial numbers 003–433 except 031, 408 and 413) to install de Havilland Modification 8/2624 in accordance with Service Bulletin 8‑24‑50. The modification provides inspection, repair of chafed wiring behind the lavatory and a cut‑away of the lavatory forward panel to reduce the risk of overheating and smoke. Operators must comply by 9 July 1998 (directive effective 9 October 1997) and therefore bear the cost and scheduling burden of the work."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, single-issue airworthiness directive addressing a specific safety defect in a specific aircraft type. It has not expanded beyond its original purpose of mandating inspection and modification of the lavatory wiring harness."},"complexity_factors":["Single, specific technical requirement with no conditional logic or exceptions beyond the serial number exclusions","Only 4 defined elements: applicability (aircraft series/serials), requirement (single modification), compliance date, and background","No cross-references to other legislation beyond a non-binding note about a Canadian equivalent directive","Straightforward temporal compliance structure (single deadline)","Technical content refers to external manufacturer documents (Service Bulletin) rather than embedding complex procedures in the legislative text itself"],"plain_english_summary":"The Civil Aviation Safety Authority requires owners/operators of specified de Havilland DHC‑8 Series 100/200/300 aeroplanes (s/n 003–433, except 031, 408, 413) to install Modification 8/2624 per Service Bulletin 8‑24‑50 by 9 July 1998. The work inspects and repairs lavatory wiring chafing and modifies the toilet panel to eliminate overheating, smoke and fire risk in the cabin and cockpit."}},"importantCases":[],"_links":{"self":"/api/acts/ad-dhc-8-49-inspection-of-wiring-harness","history":"/api/acts/ad-dhc-8-49-inspection-of-wiring-harness/history","analysis":"/api/acts/ad-dhc-8-49-inspection-of-wiring-harness/analysis","conflicts":"/api/acts/ad-dhc-8-49-inspection-of-wiring-harness/conflicts","importantCases":"/api/acts/ad-dhc-8-49-inspection-of-wiring-harness/important-cases","documents":"/api/acts/ad-dhc-8-49-inspection-of-wiring-harness/documents"}}