{"id":"F2009L03039","name":"AD/F406/18 - Landing Gear Emergency Blowdown Bottle - 2","slug":"ad-f406-18-landing-gear-emergency-blowdown-bottle-2","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":80618,"registerId":"commonwealth-F2009L03039-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/F406/18 | Landing Gear Emergency Blowdown Bottle - 2 | 9/2009 |\n| ---------- | ------------------------------------------ | ------ |\n\n| Applicability: | Model F 406 aircraft, all serial numbers, equipped with a part number 4063700-1 landing gear emergency blowdown bottle with serial number 23, 25, 27, 31, 32, 36, 37, 38 or 39.                                                                                                                                                                                                                                                                                                                                                                                                                                                        |\n| -------------- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n| Requirement:   | Rework the landing gear emergency blowdown bottle in accordance with the Accomplishment Instructions of Reims Aviation Industries Service Bulletin F406-69 initial issue, or later EASA approved revision.After the effective date of this Directive, installation on any Model F 406 aircraft of a part number 4063700-1 landing gear emergency blowdown bottle with serial number 23, 25, 27, 31, 32, 36, 37, 38 or 39 is prohibited, unless they have been previously reworked in accordance with Reims Aviation Industries Service Bulletin F406-69 initial issue, or later EASA approved revision.Note: EASA AD 2009-0128 refers. |\n| Compliance:    | Within 4 months after 27 August 2009, unless already accomplished.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     |\n|                | This Airworthiness Directive becomes effective on 27 August 2009.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      |\n| Background:    | Since the issue of EASA AD 2007-0190 (AD/F406/17), several instances of leakage of the new part number 4063700-1 blowdown bottle have been reported. Investigation revealed the cause of leakage was due to a manufacturing process which has now been resolved; therefore AD/F406/17 remains valid. Unless corrected, loss of blowdown bottle pressure could result in the inability to extend the landing gear in an emergency situation.                                                                                                                                                                                            |\n\n![](image.001.png)  \nDavid Villiers  \nDelegate of the Civil Aviation Safety Authority\n\n15 July 2009","sortOrder":0},{"sectionNumber":"AD/F406/18","sectionType":"part","heading":"AD/F406/18","content":"## AD/F406/18","sortOrder":1},{"sectionNumber":"Landing Gear Emergency Blowdown Bottle -","sectionType":"part","heading":"Landing Gear Emergency Blowdown Bottle - 2","content":"## Landing Gear Emergency Blowdown Bottle - 2","sortOrder":2},{"sectionNumber":"9/2009","sectionType":"part","heading":"9/2009","content":"## 9/2009","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"},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a targeted safety directive addressing a specific manufacturing defect in a specific aircraft component. It has not expanded beyond its original purpose of ensuring emergency landing gear functionality."},"complexity_factors":["Single, clearly defined applicability criterion (specific aircraft model + specific part numbers + specific serial numbers)","Straightforward two-part requirement: rework existing bottles + prohibition on installing un-reworked bottles","Single compliance deadline with simple alternative ('unless already accomplished')","No defined terms section, no cross-references to other legislation beyond a single note referencing the European equivalent (EASA AD)","Minimal conditional logic — essentially 'if you have this part, do this action'"],"plain_english_summary":"This AD mandates owners/operators of Reims Aviation F406 aircraft with specific emergency blowdown bottles (PN 4063700-1; S/Ns 23, 25, 27, 31, 32, 36–39) to have those bottles reworked per the manufacturer within four months of 27 August 2009. It also prohibits fitting any of these bottles unless reworked. The measure prevents loss of emergency gear-extension pressure that could cause a gear-up landing."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":true,"description":"This directive adds a targeted corrective requirement for a new part number (4063700‑1) and specific serial numbers, requiring rework and prohibiting future installation unless reworked. It supplements and preserves the earlier AD (AD/F406/17) rather than replacing it, thereby extending regulatory controls to additional manufactured units identified after the prior AD."},"complexity_factors":["Narrow applicability tied to a specific part number and discrete serial numbers (requires correct identification of affected units).","Mandated corrective action must follow Reims Aviation Industries Service Bulletin F406‑69 or a later EASA‑approved revision (dependency on external technical document and approvals).","Prohibition on installation after the effective date unless prior rework is accomplished (creates inventory and procurement constraints for operators and maintenance organisations).","Relatively short compliance window (4 months from 27 August 2009) increasing scheduling pressure for affected operators/maintenance providers.","Reference to a prior AD (AD/F406/17 / EASA AD 2007‑0190) and to EASA AD 2009‑0128 (creates interlocking regulatory references that must be checked).","Requires maintenance-level intervention (blowdown bottle rework) which imposes direct labour, parts, and certification costs on operators/maintenance organisations."],"plain_english_summary":"This Airworthiness Directive requires owners/operators of Reims Aviation F406 aeroplanes fitted with certain landing‑gear emergency blowdown bottles to have those bottles reworked to the manufacturer’s Service Bulletin standard and prohibits installing affected bottles unless they have been reworked. Compliance is required within four months of 27 August 2009. Operators pay for and arrange the rework; the regulator enforces the prohibition. The stated safety purpose is to prevent loss of bottle pressure that could stop emergency landing‑gear extension."}},"importantCases":[],"_links":{"self":"/api/acts/ad-f406-18-landing-gear-emergency-blowdown-bottle-2","history":"/api/acts/ad-f406-18-landing-gear-emergency-blowdown-bottle-2/history","analysis":"/api/acts/ad-f406-18-landing-gear-emergency-blowdown-bottle-2/analysis","conflicts":"/api/acts/ad-f406-18-landing-gear-emergency-blowdown-bottle-2/conflicts","importantCases":"/api/acts/ad-f406-18-landing-gear-emergency-blowdown-bottle-2/important-cases","documents":"/api/acts/ad-f406-18-landing-gear-emergency-blowdown-bottle-2/documents"}}