{"id":"F2006B09194","name":"AD/DHC-8/38 - ACM Delivery and Recirculation Duct Thermal Insulation","slug":"ad-dhc-8-38-acm-delivery-and-recirculation-duct-thermal-insulation","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":53001,"registerId":"commonwealth-F2006B09194-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/DHC-8/38 - ACM Delivery and Recirculation Duct Thermal Insulation","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)  Bombardier (Boeing Canada/De Havilland) DHC-8 Series Aeroplanes\n\n \n\nAD/DHC-8/38 ACM Delivery and Recirculation Duct Thermal Insulation\n\n\n6/94\n\n \n\nApplicability: DHC-8 aircraft, models and serial numbers as listed in the Requirement Document. Requirement:               Action in accordance with Transport Canada AD CF-94-26.\n\nNote: de Havilland SB 8-21-66 Revision B refers.\n\n \n\nCompliance: Unless already accomplished, prior to 1 February 1996, or as indicated in part I.D of de Havilland Service Bulletins 8-25-89 through 8-25-93, whichever occurs later.\n\n \n\nBackground: The black thermal insulation blankets that are identified in AD/DHC-8/34, have also been found to be installed on the air cycle machine delivery and recirculation ducts in the aircraft rear fuselage.\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":{"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, targeted safety directive addressing a specific technical issue (thermal insulation on specific ducts) in a specific aircraft type. It has not expanded beyond its original narrow technical scope."},"complexity_factors":["Very short document (approximately 150 words)","Only 1 defined term implicitly referenced (AD/DHC-8/34)","Single compliance pathway: follow the Canadian directive and service bulletins","No nested exceptions or conditional logic","Simple applicability statement referring to external document","Clear, single deadline with one alternative timing reference"],"plain_english_summary":"This CASA Airworthiness Directive orders owners and operators of certain Bombardier DHC‑8 (Dash 8) aircraft to remove or remedy black thermal insulation blankets found on air cycle machine delivery and recirculation ducts in the rear fuselage, following Transport Canada AD CF‑94‑26 and de Havilland service bulletins. It affects listed aircraft and maintenance personnel because the insulation can pose fire and system‑interference hazards; compliance was required by 1 February 1996."},"flash_summary":{"complexity_score":4,"scope_assessment":{"changed":true,"description":"This AD expands the affected installations identified in the earlier AD/DHC‑8/34 by adding ACM delivery and recirculation ducts in the rear fuselage to the list of areas requiring inspection and corrective action. It does so by directing operators of the listed models/serial numbers to comply with Transport Canada AD CF‑94‑26 and specified de Havilland service bulletins (see Background; Requirement; Compliance)."},"complexity_factors":["Cross‑reference to Transport Canada AD CF‑94‑26 (Requirement) — the AD requires following an external foreign airworthiness directive.","Applicability tied to models and serial numbers listed in a separate Requirement Document (Applicability) — operators must check another document to know if they are affected.","Layered compliance timing: 'prior to 1 February 1996, or as indicated in part I.D of de Havilland Service Bulletins 8‑25‑89 through 8‑25‑93, whichever occurs later' (Compliance) — creates conditional deadlines.","Multiple manufacturer service bulletins referenced and an additional note referring to de Havilland SB 8‑21‑66 Revision B (Note) — requires coordination with several SBs and revisions.","Connection to a prior directive: blankets identified in AD/DHC‑8/34 were later found on ACM ducts (Background) — this AD extends the focus of an earlier directive and requires tracing that relationship.","Practical compliance burden implied by Requirement and Background — inspections and any corrective work are on rear‑fuselage ACM ducts, which may affect access, maintenance scheduling and parts logistics."],"plain_english_summary":"Mandates inspection and corrective action for black thermal insulation blankets found on the air cycle machine (ACM) delivery and recirculation ducts in the rear fuselage of certain DHC‑8 aeroplanes. Applies only to the models and serial numbers listed in the Requirement Document. Operators must carry out the work in accordance with Transport Canada AD CF‑94‑26 and specified de Havilland service bulletins by the stated compliance date. This creates an explicit compliance obligation tied to external AD and manufacturer service‑bulletin instructions."}},"importantCases":[],"_links":{"self":"/api/acts/ad-dhc-8-38-acm-delivery-and-recirculation-duct-thermal-insulation","history":"/api/acts/ad-dhc-8-38-acm-delivery-and-recirculation-duct-thermal-insulation/history","analysis":"/api/acts/ad-dhc-8-38-acm-delivery-and-recirculation-duct-thermal-insulation/analysis","conflicts":"/api/acts/ad-dhc-8-38-acm-delivery-and-recirculation-duct-thermal-insulation/conflicts","importantCases":"/api/acts/ad-dhc-8-38-acm-delivery-and-recirculation-duct-thermal-insulation/important-cases","documents":"/api/acts/ad-dhc-8-38-acm-delivery-and-recirculation-duct-thermal-insulation/documents"}}