{"id":"F2019L00019","name":"AD/DHC-2/26 Amdt 1 Passenger Seats and Passenger Seat Attachment Fittings","slug":"ad-dhc-2-26-amdt-1-passenger-seats-and-passenger-seat-attachment-fittings","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":98664,"registerId":"commonwealth-F2019L00019-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"Viking Air DHC-2 (Beaver) Series Aeropla","sectionType":"part","heading":"Viking Air DHC-2 (Beaver) Series Aeroplanes","content":"# Viking Air DHC-2 (Beaver) Series Aeroplanes\n\n| AD/DHC-2/26 Amdt 1 | Passenger Seats and Passenger Seat Attachment Fittings | 1/2019 |\n| ------------------ | ------------------------------------------------------ | ------ |\n\n| Applicability: | All models of Viking Air (previously De Havilland Canada) DHC-2 aircraft fitted with passenger seats.                                                                                                                                                                                                                                                                                                                                                                   |\n| -------------- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n| Requirement:   | 1. Remove from service any passenger seat assembly that cannot be identified as being manufactured in accordance with a drawing approved by De Havilland Canada or a drawing approved under the Air Navigation or Civil Aviation Regulations, or the Civil Aviation Safety Regulations.2. Inspect the floor and the seat for any corrosion of the seat attachment fittings and for correct operation and locking.                                                       |\n| Compliance:    | 1. Prior to further flight after 1 March 1989.2. Prior to further flight after 1 March 1989 and thereafter before each seat installation and every twelve months whilst seats are installed.Compliance with the original issue of this airworthiness directive constitutes compliance with this issue of the Airworthiness Directive.                                                                                                                                   |\n|                | This AD commences on 11 January 2019.                                                                                                                                                                                                                                                                                                                                                                                                                                   |\n| Background:    | The investigation that followed a fatal accident has revealed that failed passenger seats were of sub-standard manufacture, were not approved in accordance with Air Navigation or Civil Aviation Regulations and that the seats had not been properly locked into the floor due to severely corroded fittings.Amendment 1 was issued to relax ongoing inspection requirements based on safe history and evidence of rates of corrosion since the issue of AD/DHC-2/26. |\n\n![](image.001.jpeg)\n\nPieter van Dijk  \nDelegate of the Civil Aviation Safety Authority\n\n2 January 2019","sortOrder":0},{"sectionNumber":"AD/DHC-2/26 Amdt 1","sectionType":"part","heading":"AD/DHC-2/26 Amdt 1","content":"## AD/DHC-2/26 Amdt 1","sortOrder":1},{"sectionNumber":"Passenger Seats and Passenger Seat Attac","sectionType":"part","heading":"Passenger Seats and Passenger Seat Attachment Fittings","content":"## Passenger Seats and Passenger Seat Attachment Fittings","sortOrder":2},{"sectionNumber":"1/2019","sectionType":"part","heading":"1/2019","content":"## 1/2019","sortOrder":3}],"analysis":{"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":true,"description":"Amendment 1 narrowed ongoing burdens by relaxing ongoing inspection requirements while leaving the initial removal/identification and corrosion/locking inspection requirements intact. The AD states that compliance with the original issue constitutes compliance with this amendment (Background; Compliance). The practical scope change is limited to the frequency/continuation of inspections rather than the initial corrective measures."},"complexity_factors":["Narrow applicability: affects all Viking Air (De Havilland Canada) DHC‑2 aircraft fitted with passenger seats — simple to identify fleet (Applicability).","Prescriptive remedial actions: mandatory removal of unidentifiable/unapproved seat assemblies and corrosion/locking inspections — clear operational tasks (Requirement).","Timing and scheduling constraints: immediacy and recurring checks (prior to further flight after 1 March 1989; before each installation; every 12 months) create operational scheduling and downtime costs (Compliance).","Traceability and paperwork: operators must verify seats against approved drawings (approved by De Havilland Canada or under Air Navigation/Civil Aviation/Civil Aviation Safety Regulations) — administrative burden for maintenance records (Requirement).","Amendment effect: Amendment 1 relaxes ongoing inspection requirements based on observed corrosion rates and safe history, changing the ongoing compliance profile (Background).","Potential drafting ambiguity: compliance dates reference 1 March 1989 while the AD commences 11 January 2019, which may require interpretive steps by operators/regulator (Compliance; AD commences).","Enforcement and oversight: regulatory enforcement lies with the Civil Aviation Safety Authority (Delegate signature) — discretion in oversight and acceptance of compliance evidence.","Cost allocation: direct costs (removal, inspection, replacement, and record-keeping) fall on aircraft owners/operators; safety risk of non-compliance creates strong operational incentive to comply (Requirement; Compliance)."],"plain_english_summary":"This airworthiness directive requires operators of Viking Air DHC-2 (Beaver) aeroplanes with passenger seats to remove any seat assemblies that cannot be shown to be manufactured to an approved drawing and to inspect seat attachments and floor fittings for corrosion and correct locking. It was issued after an investigation into a fatal accident found sub‑standard seats and corroded fittings; Amendment 1 relaxes ongoing inspection frequency based on later evidence about corrosion rates."},"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"},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This amendment maintains the original scope of addressing unsafe passenger seats in DHC-2 aircraft. The only change was relaxing the frequency of ongoing inspections based on accumulated safety data, which is a standard refinement rather than scope expansion."},"complexity_factors":["Very short document (approximately 300 words)","Only 2 main requirements with clear, numbered instructions","Minimal defined terms (only standard aviation terminology like 'Airworthiness Directive')","No cross-references to other legislation beyond generic mentions of Civil Aviation Safety Regulations","Simple conditional logic: 'if seat not approved → remove it'","Straightforward compliance timeline with specific dates","Single amendment with clearly stated purpose in Background section"],"plain_english_summary":"This AD mandates owners/operators of Viking Air DHC‑2 “Beaver” aircraft with passenger seats to remove any seats not shown to conform to approved design drawings and to inspect floor attachments and seat fittings for corrosion and proper locking. It targets operators, maintainers and owners (charters, tourism, private) and follows a fatal accident caused by unapproved seats, corroded fittings and unlocked seats; a 2019 amendment eased inspection frequency but kept core safety steps."}},"importantCases":[],"_links":{"self":"/api/acts/ad-dhc-2-26-amdt-1-passenger-seats-and-passenger-seat-attachment-fittings","history":"/api/acts/ad-dhc-2-26-amdt-1-passenger-seats-and-passenger-seat-attachment-fittings/history","analysis":"/api/acts/ad-dhc-2-26-amdt-1-passenger-seats-and-passenger-seat-attachment-fittings/analysis","conflicts":"/api/acts/ad-dhc-2-26-amdt-1-passenger-seats-and-passenger-seat-attachment-fittings/conflicts","importantCases":"/api/acts/ad-dhc-2-26-amdt-1-passenger-seats-and-passenger-seat-attachment-fittings/important-cases","documents":"/api/acts/ad-dhc-2-26-amdt-1-passenger-seats-and-passenger-seat-attachment-fittings/documents"}}