{"id":"F2006B09203","name":"AD/DHC-8/48 Amdt 2 - Provision of Separate Instrument Grounds","slug":"ad-dhc-8-48-amdt-2-provision-of-separate-instrument-grounds","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":53027,"registerId":"commonwealth-F2006B09203-current","compilationNumber":null,"startDate":"2026-04-02","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/DHC-8/48 Amdt 2 - Provision of Separate Instrument Grounds","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-8/48\n\nAmdt 2\n\n  \nProvision of Separate Instrument Grounds 8/97\n\nApplicability: de Havilland Inc. DHC-8, Models 102, 103, 106, 201, 202, 301, 311, 314 and 315,\n\nserial numbers 3 to 483.\n\nRequirement: Install de Havilland modification 8/2710 in accordance with de Havilland Alert Service Bulletin A8-34-117, Revision C, dated 14 February 1997.\n\nNote: Transport Canada AD CF-97-01R1 refers.\n\nCompliance: Within 400 hours time in service after 17 July 1997.\n\nThis airworthiness directive becomes effective on 17 July 1997.\n\nBackground: This amendment renames the AD to more clearly identify the nature of the directive. Transport Canada advises that simultaneous failures of both the pilot’s and co-pilot’s Attitude and Heading Reference System have occurred due to a faulty terminal block which provides a common ground connection. The modification details the provision of separate grounds for each instrument. This amendment increases the application of the requirement in accordance with that mandated by Transport Canada.\n\nAmendment 1 of this airworthiness directive became effective on 24 April 1997.\n\nThe original issue of this airworthiness directive became effective on 27 March 1997.","sortOrder":0}],"analysis":{"kimi_summary":{"_metrics":{"model":"kimi-k2.5","source":"moonshot-batch","completionTokens":2130},"content_quality":"ok","complexity_score":3,"scope_assessment":{"changed":true,"description":"This amendment expanded the directive's coverage to include more aircraft than the original March 1997 issue, following updated requirements from Transport Canada. It also renamed the directive for clearer identification."},"complexity_factors":["Incorporates by reference external technical document (de Havilland Alert Service Bulletin A8-34-117, Revision C) which contains the detailed installation instructions","Applicability defined by specific aircraft models and serial number range (3 to 483) requiring cross-checking against aircraft logs","Compliance deadline calculated as a function of 'time in service' (flight hours) rather than calendar date"],"plain_english_summary":"This directive requires owners/operators of specified de Havilland DHC‑8 (Dash 8) aircraft—models 102, 103, 106, 201, 202, 301, 311, 314 and 315, S/N 3–483—to install separate electrical grounds for each pilot’s Attitude and Heading Reference System per de Havilland Alert Service Bulletin A8‑34‑117 Rev C, to prevent simultaneous loss of both pilots’ main flight instruments.\n\nThe modification must be completed within 400 flight hours after 17 July 1997 to stop a single grounding fault from leaving both pilots without essential attitude and heading information."}},"importantCases":[],"_links":{"self":"/api/acts/ad-dhc-8-48-amdt-2-provision-of-separate-instrument-grounds","history":"/api/acts/ad-dhc-8-48-amdt-2-provision-of-separate-instrument-grounds/history","analysis":"/api/acts/ad-dhc-8-48-amdt-2-provision-of-separate-instrument-grounds/analysis","conflicts":"/api/acts/ad-dhc-8-48-amdt-2-provision-of-separate-instrument-grounds/conflicts","importantCases":"/api/acts/ad-dhc-8-48-amdt-2-provision-of-separate-instrument-grounds/important-cases","documents":"/api/acts/ad-dhc-8-48-amdt-2-provision-of-separate-instrument-grounds/documents"}}