{"id":"F2006B09242","name":"AD/DHC-8/83 - Mode S Transponder Wiring","slug":"ad-dhc-8-83-mode-s-transponder-wiring","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":53146,"registerId":"commonwealth-F2006B09242-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"AIRWORTHINESS DIRECTIVE","sectionType":"part","heading":"AIRWORTHINESS DIRECTIVE","content":"# AIRWORTHINESS DIRECTIVE\n\n![](image.001.png)\n\n![](image.001.png)  \nFor the reasons set out in the background section, the CASA delegate whose signature appears below issues the following Airworthiness Directive (AD) under subregulation 39.1 (1) of CAR 1998. The AD requires that the action set out in the requirement section (being action that the delegate considers necessary to correct the unsafe condition) be taken in relation to the aircraft or aeronautical product mentioned in the applicability section: (a) in the circumstances mentioned in the requirement section; and (b) in accordance with the instructions set out in the requirement section; and (c) at the time mentioned in the compliance section.\n\nBombardier (Boeing Canada/de Havilland) DHC-8 Series Aeroplanes","sortOrder":0},{"sectionNumber":"AD/DHC-8/83 Mode S Transponder Wiring 12","sectionType":"part","heading":"AD/DHC-8/83 Mode S Transponder Wiring 12/2001","content":"# AD/DHC-8/83 Mode S Transponder Wiring 12/2001\n\nApplicability: DHC-8 series 100, 200 and 300 aeroplanes, serial numbers 003 through 559. Requirement: Unless already accomplished, install ModSum 8Q100769 and ModSum 8Q101094.\n\nBombardier Service Bulletin (SB) 8-34-200 dated 26 June 2001 provides approved instructions for installing ModSum 8Q100769.\n\nBombardier SB 8-30-36 dated 13 July 2000 provides approved instructions for installing ModSum 8Q101094.\n\nNote: Transport Canada AD CF-2001-38 refers.\n\nCompliance: Within 6 months after the effective date of this Directive.\n\nThis Airworthiness Directive becomes effective on 29 November 2001.\n\nBackground: An investigation of two reports identified wire bundle chafing on the No 2 propeller de-ice timer. The chafing could lead to incorrect altitude information transmitted by the Mode S transponder and simultaneous loss of the Traffic Alert and Collision Avoidance System. This Directive introduces measures designed to prevent the chafing occurring.\n\n![](image.002.png)  \n\nEugene Paul Holzapfel\n\nDelegate of the Civil Aviation Safety Authority 19 October 2001\n\n![](image.001.png)  \n\nThe above AD is notified in the Commonwealth of Australia Gazette on 7 November 2001.","sortOrder":1}],"analysis":{"flash_summary_failed":{"failed":true,"reason":"A positive credit balance is required for all requests, including BYOK, so fallback providers remain available. Add credits at https://vercel.com/d?to=%2F%5Bteam%5D%2F%7E%2Fai%3Fmodal%3Dtop-up to continue.","source":"analysis-cron"},"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":false,"description":"Scope has not been expanded beyond the original corrective purpose: the AD applies only to DHC‑8 series 100/200/300 serials 003–559 and requires installation of ModSum 8Q100769 and ModSum 8Q101094 per the Bombardier service bulletins, to address wiring chafing that could affect Mode S and TCAS. The directive specifies who must act (aircraft owners/operators), what to install (the two ModSums via the SBs), and when (within six months)."},"complexity_factors":["Narrow applicability: limited to DHC‑8 series 100/200/300 with serial numbers 003–559 (Applicability).","Single, discrete technical remedy: installation of two specified ModSums (Requirement).","Use of manufacturer-approved instructions reduces regulatory drafting complexity but creates operational dependency on Bombardier SBs (Bombardier SB 8-34-200 and SB 8-30-36 referenced).","Short, fixed compliance window of six months creates scheduling pressure for operators (Compliance).","Safety-critical nature increases urgency but does not add procedural complexity to the AD text itself (Background describes risk).","Reference to Transport Canada AD adds an international-regulator cross-reference but no additional actions in this text."],"plain_english_summary":"This Airworthiness Directive requires operators of Bombardier (de Havilland) DHC‑8 series 100, 200 and 300 aeroplanes (serial numbers 003–559) to install two wiring modifications (ModSum 8Q100769 and ModSum 8Q101094) using Bombardier service bulletins. CASA requires the work be done within six months to prevent wire chafing that could cause incorrect Mode S altitude reporting and loss of TCAS alerts. Aircraft owners/operators must arrange and pay for the mandated maintenance, following the approved manufacturer instructions."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This AD maintains its original narrow scope — addressing a specific wiring chafing issue on specific DHC-8 aircraft models. The directive precisely targets the identified unsafe condition without expanding into broader operational or maintenance requirements."},"complexity_factors":["Very short document (approximately 250 words)","Only 2 defined applicability criteria (aircraft series and serial numbers)","Single straightforward requirement with 2 specific modification references","No nested exceptions or conditional logic","Clear compliance deadline (6 months from effective date)","Minimal cross-referencing (only 2 service bulletins and 1 related Canadian AD mentioned in passing)"],"plain_english_summary":"This mandatory CASA Airworthiness Directive requires owners/operators of Bombardier DHC‑8 Series 100/200/300 (s/n 003–559) to install two wiring modification kits to stop chafing near the No.2 propeller de‑ice timer. The defect can corrupt Mode S altitude broadcasts and disable TCAS, creating collision and ATC-safety risks. Work must follow the manufacturer's service bulletins and be completed within six months of the directive (by 29 November 2001)."}},"importantCases":[],"_links":{"self":"/api/acts/ad-dhc-8-83-mode-s-transponder-wiring","history":"/api/acts/ad-dhc-8-83-mode-s-transponder-wiring/history","analysis":"/api/acts/ad-dhc-8-83-mode-s-transponder-wiring/analysis","conflicts":"/api/acts/ad-dhc-8-83-mode-s-transponder-wiring/conflicts","importantCases":"/api/acts/ad-dhc-8-83-mode-s-transponder-wiring/important-cases","documents":"/api/acts/ad-dhc-8-83-mode-s-transponder-wiring/documents"}}