{"id":"F2008L00509","name":"AD/J4100/20 - Passenger Cabin Seat Rails","slug":"ad-j4100-20-passenger-cabin-seat-rails","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":119356,"registerId":"commonwealth-F2008L00509-current","compilationNumber":null,"startDate":"2026-04-03","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"BAe Systems (Operations) Jetstream 4100 ","sectionType":"division","heading":"BAe Systems (Operations) Jetstream 4100 Series Aeroplanes","content":"### BAe Systems (Operations) Jetstream 4100 Series Aeroplanes\n\n| AD/J4100/20 | Passenger Cabin Seat Rails | 4/2008 DM |\n| ----------- | -------------------------- | --------- |\n\n| Applicability: | All Model Jetstream Series 4100 aircraft.                                                                                                                                                                         |\n| -------------- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n| Requirement:   | Action in accordance with BAE Systems Mandatory Service Bulletin J41-53-050 Revision 1, or later CAA/EASA approved revision.Note: UK CAA AD 005-01-2002 refers.                                                   |\n| Compliance:    | Unless the initial inspection is already accomplished, within 30 days after20 February 2008. Inspect thereafter at intervals not to exceed 2 years.                                                               |\n|                | This Airworthiness Directive becomes effective on 20 February 2008.                                                                                                                                               |\n| Background:    | Corrosion found on the passenger cabin seat rails has been attributed to fluid spillage and collection of debris inside the seat rail track. A dedicated inspection is required to maintain structural integrity. |\n\n![](image.001.png)  \nDavid Villiers  \nDelegate of the Civil Aviation Safety Authority\n\n15 February 2008","sortOrder":0},{"sectionNumber":"AD/J4100/20","sectionType":"part","heading":"AD/J4100/20","content":"## AD/J4100/20","sortOrder":1},{"sectionNumber":"Passenger Cabin Seat Rails","sectionType":"part","heading":"Passenger Cabin Seat Rails","content":"## Passenger Cabin Seat Rails","sortOrder":2},{"sectionNumber":"4/2008 DM","sectionType":"part","heading":"4/2008 DM","content":"## 4/2008 DM","sortOrder":3}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a standard, narrow airworthiness directive targeting a specific corrosion issue in a specific aircraft type. The scope remains tightly focused on seat rail inspections as originally intended."},"complexity_factors":["Single, specific mechanical component addressed (seat rails only)","One primary compliance document referenced (Service Bulletin J41-53-050)","Simple temporal compliance structure (initial 30-day window + 2-year recurring interval)","No defined terms section or interpretation provisions","No conditional exceptions or nested logic — applies to 'all' aircraft in the series uniformly","Cross-reference limited to one UK CAA AD and the service bulletin itself"],"plain_english_summary":"This is an **Airworthiness Directive (AD)** — a mandatory safety order issued by Australia's Civil Aviation Safety Authority (CASA). It applies to all **BAe Systems Jetstream 4100 series aircraft**.\n\n**What it does:**\n- Requires aircraft operators to inspect the **passenger cabin seat rails** for corrosion\n- The inspection must follow a specific technical bulletin: **BAE Systems Mandatory Service Bulletin J41-53-050 Revision 1** (or later approved versions)\n\n**Why it matters:**\n- Corrosion was found in seat rails caused by spilled drinks and debris collecting in the rail tracks\n- Left unchecked, this could weaken the aircraft's structure and compromise safety\n\n**Who must act:**\n- Owners and operators of Jetstream 4100 aircraft\n\n**When:**\n- First inspection within **30 days of 20 February 2008** (unless already done)\n- Repeat inspections every **2 years** thereafter\n\n**Key point:** This isn't optional — compliance is legally mandatory for continued airworthiness certification."},"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":false,"description":"The directive implements a focused safety requirement—mandatory initial and recurring inspections of passenger seat rails for all Jetstream 4100 series aircraft—matching the text’s stated purpose. The AD does not expand or narrow applicability beyond the stated class of aircraft nor introduce additional obligations beyond following the cited service bulletin and the inspection schedule (see Applicability; Requirement; Compliance)."},"complexity_factors":["Narrow applicability: applies only to all Model Jetstream Series 4100 aircraft (Applicability).","Clear mandated procedure: requires action in accordance with a specific BAE Mandatory Service Bulletin, or later CAA/EASA‑approved revision (Requirement).","Simple compliance timeline: initial inspection within 30 days after 20 February 2008 (unless already done) and recurring inspections every 2 years (Compliance).","Dependence on external approvals: allows later revisions only if approved by CAA/EASA, creating dependence on external regulatory decisions for acceptable procedures (Requirement).","Operational burden on operators: inspections and any repairs/remediation are borne by aircraft operators; costs and downtime are not specified (Compliance / Background).","Enforcement clarity: effective date and delegate signature provided (becomes effective 20 February 2008; Delegate of CASA) (Compliance).","Residual technical discretion: the directive points to the service bulletin for technical detail, so repair scope and methods follow the bulletin’s guidance rather than being fully specified in the AD (Requirement / Background).","Fleet management requirement: recurring two‑year interval imposes scheduling and recordkeeping obligations across affected fleets (Compliance)."],"plain_english_summary":"This Airworthiness Directive requires operators of all BAe Jetstream 4100 series aircraft to inspect passenger-seat rails per BAE Mandatory Service Bulletin J41‑53‑050 Rev 1 (or a later CAA/EASA‑approved revision), initially within 30 days after 20 February 2008 if not already done, and then at intervals not exceeding two years. It responds to corrosion from fluid spillage and debris; aircraft operators must pay for inspections and any remedial work, and CASA enforces compliance."}},"importantCases":[],"_links":{"self":"/api/acts/ad-j4100-20-passenger-cabin-seat-rails","history":"/api/acts/ad-j4100-20-passenger-cabin-seat-rails/history","analysis":"/api/acts/ad-j4100-20-passenger-cabin-seat-rails/analysis","conflicts":"/api/acts/ad-j4100-20-passenger-cabin-seat-rails/conflicts","importantCases":"/api/acts/ad-j4100-20-passenger-cabin-seat-rails/important-cases","documents":"/api/acts/ad-j4100-20-passenger-cabin-seat-rails/documents"}}