{"id":"F2006B09195","name":"AD/DHC-8/39 Amdt 1 - Outboard Flaps Front Spar and Top Skin Fasteners","slug":"ad-dhc-8-39-amdt-1-outboard-flaps-front-spar-and-top-skin-fasteners","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":53004,"registerId":"commonwealth-F2006B09195-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/DHC-8/39 Amdt 1 - Outboard Flaps Front Spar and Top Skin Fasteners","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-8/39\n\nAmdt 1\n\n  \nOutboard Flaps Front Spar and Top Skin Fasteners 1/96\n\nApplicability: DHC-8 aircraft Model 301.\n\nDHC-8 aircraft Models 311, 314, and 315, equipped with outboard flap assemblies without Modification 8/2066 installed, and with part numbers and serial numbers listed in the accompanying table of the Requirement Document.\n\nRequirement: Action in accordance with the technical requirements of Transport Canada AD CF- 95-05R1.\n\nA Flight Manual amendment is required.\n\nNote: De Havilland SB 8-57-24 Revision A refers.\n\nCompliance: As specified in the Requirement Document with a revised effective date of 4 January 1996.\n\nBackground: Reports have shown that incorrect rivets were used during manufacture of the affected flap assemblies. Incorrect rivets are replaced with ones of higher strength for the Models 311, 314, and 315, and the flap extended speed, VFE, is permanently reduced for the Model 301.\n\nAmendment 1 is issued in response to a revision of the Requirement Document which addresses short compliance time concerns as well as the resources required for the structural modification.","sortOrder":0}],"analysis":{"flash_summary":{"complexity_score":4,"scope_assessment":{"changed":false,"description":"Amendment 1 does not expand or narrow which aircraft or the core corrective actions required (rivet replacement or VFE reduction). It responds to a revised Requirement Document by changing compliance timing and addressing resource needs for the structural modification, but the substantive scope of corrective measures remains the same (see 'Requirement', 'Compliance', 'Background', and final paragraph)."},"complexity_factors":["Cross-reference to an external mandatory document (Transport Canada AD CF-95-05R1) rather than full technical steps in this instrument","Applicability limited to certain models, part numbers and serial numbers listed in an external Requirement Document/table","Requirement for both structural work (rivet replacement or modification) and an administrative Flight Manual amendment","Amendment modifies compliance timing and resource expectations, creating implementation scheduling complexity for operators","Reference to a service bulletin (De Havilland SB 8-57-24 Rev A) and a Requirement Document increases document-reading and coordination burden","Possibility of different measures by model (rivets replaced for Models 311/314/315; VFE reduction for Model 301) adds differentiation to compliance actions","Compliance effective date revision requires tracking of amended deadlines"],"plain_english_summary":"Requires operators of specified Bombardier (De Havilland) DHC‑8 models to follow Transport Canada AD CF‑95‑05R1: replace incorrect rivets with higher‑strength fasteners on certain outboard flap front spars and top skins, and reduce the flap‑extended speed (VFE) for Model 301. A Flight Manual amendment is also required.\n\nThis affects aircraft owners/operators and maintenance organisations, who pay for repairs, modifications and paperwork and must meet revised compliance times; Amendment 1 adjusts compliance timing and resource allowances but keeps the core corrective action the same."},"kimi_summary":{"content_quality":"ok","complexity_score":4,"scope_assessment":{"changed":false,"description":"This amendment stays within the original scope of addressing the rivet defect. It does not expand to new aircraft models or new safety issues. The changes are procedural — adjusting compliance timelines and resource planning — rather than substantive additions to the safety requirements."},"complexity_factors":["Multiple applicability conditions requiring cross-referencing: specific aircraft models, modification status, and part/serial number tables in an external document","Dual compliance pathways: physical modification for some aircraft vs. operational limitation (speed restriction) for others","Mandatory reference to external technical documents: Transport Canada AD CF-95-05R1 and De Havilland SB 8-57-24 Revision A","Amendment structure requiring understanding of what changed from original AD (compliance time extensions)","Technical aviation terminology requiring domain knowledge (VFE, outboard flaps, Modification 8/2066, Service Bulletin references)"],"plain_english_summary":"This AD mandates fixes and operational limits for certain Bombardier DHC‑8 (Dash 8) aeroplanes after wrong rivets were used in outboard flaps, creating a potential structural weakness. It requires Model 301s to permanently reduce VFE and mandates stronger rivets for Models 311/314/315 unless a specified factory modification is already present. Operators must follow Transport Canada AD CF‑95‑05R1, update flight manuals, and meet the revised compliance deadlines."}},"importantCases":[],"_links":{"self":"/api/acts/ad-dhc-8-39-amdt-1-outboard-flaps-front-spar-and-top-skin-fasteners","history":"/api/acts/ad-dhc-8-39-amdt-1-outboard-flaps-front-spar-and-top-skin-fasteners/history","analysis":"/api/acts/ad-dhc-8-39-amdt-1-outboard-flaps-front-spar-and-top-skin-fasteners/analysis","conflicts":"/api/acts/ad-dhc-8-39-amdt-1-outboard-flaps-front-spar-and-top-skin-fasteners/conflicts","importantCases":"/api/acts/ad-dhc-8-39-amdt-1-outboard-flaps-front-spar-and-top-skin-fasteners/important-cases","documents":"/api/acts/ad-dhc-8-39-amdt-1-outboard-flaps-front-spar-and-top-skin-fasteners/documents"}}