{"id":"F2007L02563","name":"AD/F406/17 - Landing Gear Emergency Blowdown Bottle","slug":"ad-f406-17-landing-gear-emergency-blowdown-bottle","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":68248,"registerId":"commonwealth-F2007L02563-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"Reims Aviation F406 Series Aeroplanes","sectionType":"division","heading":"Reims Aviation F406 Series Aeroplanes","content":"### Reims Aviation F406 Series Aeroplanes\n\n| AD/F406/17 | Landing Gear Emergency Blowdown Bottle | 9/2007 |\n| ---------- | -------------------------------------- | ------ |\n\n| Applicability: | Model F 406 aircraft, all serial numbers, equipped with landing gear emergency blowdown bottle part number 9910154-4.                                                                                                                                                                                  |\n| -------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ |\n| Requirement:   | Remove the affected landing gear emergency blowdown bottle and install a new bottle part number 4063700-1 in accordance with the Accomplishment Instructions of Reims Aviation Industries Service Bulletin No. F406-66 original issue, or later EASA approved revision.Note: EASA AD 2007-0190 refers. |\n| Compliance:    | No later than the next 5 year inspection or at the next removal of the emergency blowdown bottle, whichever occurs first after 30 August 2007.                                                                                                                                                         |\n|                | This Airworthiness Directive becomes effective on 30 August 2007.                                                                                                                                                                                                                                      |\n| Background:    | Reports were received of leakage from landing gear emergency blowdown bottles. Investigation revealed leakage due to a design deficiency in the bottle head. Loss of bottle pressure could result in the inability to extend landing gears in the event of an emergency situation.                     |\n\n![](image.001.png)  \nDavid Villiers  \nDelegate of the Civil Aviation Safety Authority\n\n20 July 2007","sortOrder":0},{"sectionNumber":"AD/F406/17","sectionType":"part","heading":"AD/F406/17","content":"## AD/F406/17","sortOrder":1},{"sectionNumber":"Landing Gear Emergency Blowdown Bottle","sectionType":"part","heading":"Landing Gear Emergency Blowdown Bottle","content":"## Landing Gear Emergency Blowdown Bottle","sortOrder":2},{"sectionNumber":"9/2007","sectionType":"part","heading":"9/2007","content":"## 9/2007","sortOrder":3}],"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":false,"description":"The AD targets a specific part on all serial numbers of the F406 and mandates a like‑for‑like part replacement per the manufacturer service bulletin. It does not broaden applicability beyond the stated aircraft/part combination nor add additional regulatory obligations beyond the replacement and compliance timing specified (Applicability; Requirement; Compliance)."},"complexity_factors":["Narrow applicability: applies only to Model F406 aircraft fitted with blowdown bottle part 9910154‑4 (Applicability).","Mandatory parts replacement: requires removal of the specified part and installation of part 4063700‑1 (Requirement).","Reliance on external technical material: compliance must follow Reims Aviation Service Bulletin No. F406‑66 or a later EASA‑approved revision (Requirement).","Time window constraint: compliance deadline is the next 5‑year inspection or at the next removal of the bottle, whichever occurs first after 30 August 2007 (Compliance).","Safety consequence drives action: leakage from the bottle head could cause loss of bottle pressure and inability to extend landing gear in an emergency (Background).","Effective date: the AD is effective from 30 August 2007, creating a fixed compliance baseline (Compliance/Effective date)."],"plain_english_summary":"This Airworthiness Directive requires owners/operators of Reims Aviation F406 aircraft fitted with landing‑gear emergency blowdown bottle part 9910154‑4 to remove that bottle and install replacement part 4063700‑1 following Reims Aviation Service Bulletin F406‑66 (or later EASA‑approved revision). Compliance is required by the next 5‑year inspection or at the next removal of the bottle, whichever occurs first after 30 August 2007. The change responds to reported leakage that can prevent emergency gear extension."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a standard, narrow Airworthiness Directive addressing a specific safety-critical defect in a particular aircraft part. The scope remains tightly focused on the original safety issue (leaking blowdown bottles) without expansion into broader operational or maintenance requirements."},"complexity_factors":["Single, specific mechanical component targeted (one part number)","Straightforward replacement requirement with clear manufacturer reference","Simple compliance deadline (earlier of two events, with fixed effective date)","No nested exceptions, conditional logic, or alternative compliance methods","Minimal cross-referencing (only to EASA AD and manufacturer service bulletin)","Short document (approximately 200 words of substantive content)"],"plain_english_summary":"This CASA Airworthiness Directive requires operators of Reims Aviation F406 aircraft fitted with emergency blowdown bottle P/N 9910154-4 to remove the faulty unit and install redesigned bottle P/N 4063700-1 per the manufacturer's service instructions. The bottle’s valve/head can leak, risking loss of emergency gear extension.\n\nAffected operators and maintainers must comply by the earlier of the next scheduled 5‑year inspection or the next removal of the bottle — but in any case after 30 August 2007."}},"importantCases":[],"_links":{"self":"/api/acts/ad-f406-17-landing-gear-emergency-blowdown-bottle","history":"/api/acts/ad-f406-17-landing-gear-emergency-blowdown-bottle/history","analysis":"/api/acts/ad-f406-17-landing-gear-emergency-blowdown-bottle/analysis","conflicts":"/api/acts/ad-f406-17-landing-gear-emergency-blowdown-bottle/conflicts","importantCases":"/api/acts/ad-f406-17-landing-gear-emergency-blowdown-bottle/important-cases","documents":"/api/acts/ad-f406-17-landing-gear-emergency-blowdown-bottle/documents"}}