{"id":"F2006B09258","name":"AD/DHC-8/99 - Fuselage Longitudinal Skin Joints","slug":"ad-dhc-8-99-fuselage-longitudinal-skin-joints","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":53230,"registerId":"commonwealth-F2006B09258-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"AIRWORTHINESS DIRECTIVE","sectionType":"part","heading":"AIRWORTHINESS DIRECTIVE","content":"# ![](image.001.png)  \nAIRWORTHINESS DIRECTIVE\n\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 CASR 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\n![](image.001.png)  \n\nBombardier (Boeing Canada/De Havilland) DHC-8 Series Aeroplanes","sortOrder":0},{"sectionNumber":"AD/DHC-8/99 Fuselage Longitudinal Skin J","sectionType":"part","heading":"AD/DHC-8/99 Fuselage Longitudinal Skin Joints 12/2004","content":"# AD/DHC-8/99 Fuselage Longitudinal Skin Joints 12/2004\n\nDM\n\nApplicability: DHC-8 aircraft, Models 102, 103, 106, 201, 202, 301, 311, 314, and 315, with serial numbers 003 and subsequent.\n\nRequirement: A. Airworthiness Limitations Change\n\nAmend the Transport Canada approved maintenance schedule by incorporating the new and revised structural inspection tasks as introduced by Temporary Revision (TR) of Airworthiness Limitations List (AWL) of the DHC-8 Maintenance Program Manuals (MPM) specified below:\n\n| DHC-8 Models         | MPM        | Task No.         | Temporary Revision      |\n| -------------------- | ---------- | ---------------- | ----------------------- |\n| 102, 103, 106        | PSM 1-8-7  | 5310/29E5310/30A | TR AWL-92 TR AWL-93     |\n| 201, 202             | PSM 1-82-7 | 5310/29E5310/30A | TR AWL 2-31TR AWL 2-32  |\n| 301, 311, 314, 315   | PSM 1-83-7 | 5310/29E5310/30A | TR AWL 3-98,TR AWL 3-99 |\n| B. Phase-In Schedule |            |                  |                         |\n\nThe phase-in schedule for the structural inspection tasks detailed in Requirement A is as follows:\n\n    For aircraft that have accumulated less than or equal to 40,000 flight cycles at the effective date of this Directive:\n\nPerform the structural inspection task numbers 5310/29E and 5310/30A.","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":3,"scope_assessment":{"changed":true,"description":"This AD expands the maintenance scope by adding new and revised structural inspection tasks for fuselage longitudinal skin joints into the Airworthiness Limitations List and requires operators to amend their approved maintenance schedules to incorporate those tasks (Requirement A). It also imposes a phase‑in compliance condition for aircraft with 40,000 flight cycles or fewer at the AD effective date (Requirement B)."},"complexity_factors":["Applicability scope lists multiple models and a serial‑number cutoff (Applicability).","Requirement to amend a foreign‑approved maintenance program (Transport Canada AWL) introduces cross‑jurisdictional compliance steps (Requirement A).","Mandate references specific MPM documents, task numbers and Temporary Revisions rather than describing inspection content, requiring operators to obtain and apply those documents (Requirement A).","Phase‑in rule ties compliance to aircraft flight cycles (<=40,000 FC) and the AD effective date, creating time‑dependent triggers (Requirement B).","Operators must integrate the new tasks into scheduled maintenance and carry out inspections, creating direct operational and cost burdens (Requirement A & B).","AD is procedural rather than prescriptive about corrective action details; compliance depends on following the referenced TRs and MPM tasks (Requirement A)."],"plain_english_summary":"This AD requires operators of Bombardier (De Havilland) DHC‑8 aeroplanes (Models 102,103,106,201,202,301,311,314,315; serial numbers 003 onward) to amend their Transport Canada–approved maintenance schedule to add specific structural inspection tasks for fuselage longitudinal skin joints, using specified Temporary Revisions to the Airworthiness Limitations List. For aircraft with 40,000 flight cycles or fewer at the AD effective date, operators must perform inspection tasks 5310/29E and 5310/30A. The CASA delegate issues the requirement; operators pay to update programs and carry out the inspections."},"kimi_summary":{"content_quality":"rejected","complexity_score":3,"rejection_reason":"The document is clearly incomplete. The phase-in schedule cuts off mid-sentence ('For aircraft that have accumulated less than or equal to 40,000 flight cycles...') with no completion of the requirement, and there is no compliance section despite being referenced in the introductory text. The document appears to be a fragment or excerpt rather than a complete legislative instrument.","scope_assessment":{"changed":false,"description":"This appears to be a standard airworthiness directive maintaining its original scope. ADs are inherently narrow technical instruments addressing specific unsafe conditions in specific aircraft types. The content shows no evidence of scope creep beyond the original safety purpose of addressing fuselage skin joint integrity."},"complexity_factors":["Highly technical aviation terminology requiring specialized knowledge (e.g., 'fuselage longitudinal skin joints', 'Airworthiness Limitations List', 'Temporary Revision')","Multiple cross-references to external manufacturer documents (PSM 1-8-7, PSM 1-82-7, PSM 1-83-7 manuals) not contained within the directive itself","Tabular presentation of applicability across 9 different aircraft models with different manual references","Conditional compliance based on flight cycle accumulation (≤40,000 cycles threshold)","Incomplete content — the phase-in schedule cuts off mid-sentence and compliance section appears truncated"],"plain_english_summary":"This AD requires operators of Bombardier DHC‑8 Series 100/200/300 aircraft to update approved maintenance programs to add new structural inspections of the fuselage longitudinal skin joints, with a phase‑in tied to flight cycles. \n\nIt affects Dash‑8 aircraft from serial 003 onward in Australia and aims to detect cracking or fatigue in critical seams before they can cause fuselage structural failure."}},"importantCases":[],"_links":{"self":"/api/acts/ad-dhc-8-99-fuselage-longitudinal-skin-joints","history":"/api/acts/ad-dhc-8-99-fuselage-longitudinal-skin-joints/history","analysis":"/api/acts/ad-dhc-8-99-fuselage-longitudinal-skin-joints/analysis","conflicts":"/api/acts/ad-dhc-8-99-fuselage-longitudinal-skin-joints/conflicts","importantCases":"/api/acts/ad-dhc-8-99-fuselage-longitudinal-skin-joints/important-cases","documents":"/api/acts/ad-dhc-8-99-fuselage-longitudinal-skin-joints/documents"}}