{"id":"F2009L01567","name":"AD/BELL 407/35 - Gas Producer RPM","slug":"ad-bell-407-35-gas-producer-rpm","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":78295,"registerId":"commonwealth-F2009L01567-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"Bell Helicopter Textron Canada (BHTC) 40","sectionType":"division","heading":"Bell Helicopter Textron Canada (BHTC) 407 Series Helicopters","content":"### Bell Helicopter Textron Canada (BHTC) 407 Series Helicopters\n\n| AD/BELL 407/35 | Gas Producer RPM | 5/2009 |\n| -------------- | ---------------- | ------ |\n\n| Applicability: | Bell Helicopter Textron Canada (BHTC) Model 407 helicopters, serial numbers 53000 through 53862.                                                                                                                                                                                                                                                                                                           |\n| -------------- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n| Requirement:   | Install decal P/N 407-070-008-101 in accordance with instructions provided in BHTC Alert Service Bulletin (ASB) 407-08-82 Rev. A dated 17 November 2008, or later revisions approved by the Chief, Continuing Airworthiness, Transport Canada.Note 1: Compliance to ASB 407-08-82 dated 19 May 2008 meets the requirements of this AD.Note 2: Transport Canada AD CF-2009-06 dated 5 February 2009 refers. |\n| Compliance:    | Within 50 flight hours but no later than 30 days after the effective date of this AD, unless previously accomplished.                                                                                                                                                                                                                                                                                      |\n|                | This Airworthiness Directive becomes effective on 7 May 2009.                                                                                                                                                                                                                                                                                                                                              |\n| Background:    | A gas producer RPM (NG) limitation for high altitude and cold temperature has been introduced in Revision 7 to the Flight Manual. A corresponding decal is to be installed in the cockpit to provide a quick reference for the pilot.This AD mandates installation of the decal in the cockpit.                                                                                                            |\n\n![](image.001.png)  \nJames Coyne  \nDelegate of the Civil Aviation Safety Authority\n\n26 March 2009","sortOrder":0},{"sectionNumber":"AD/BELL 407/35","sectionType":"part","heading":"AD/BELL 407/35","content":"## AD/BELL 407/35","sortOrder":1},{"sectionNumber":"Gas Producer RPM","sectionType":"part","heading":"Gas Producer RPM","content":"## Gas Producer RPM","sortOrder":2},{"sectionNumber":"5/2009","sectionType":"part","heading":"5/2009","content":"## 5/2009","sortOrder":3}],"analysis":{"flash_summary_failed":{"failed":true,"reason":"Unauthenticated. Configure AI_GATEWAY_API_KEY or use a provider module. Learn more: https://ai-sdk.dev/unauthenticated-ai-gateway","source":"analysis-cron"},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This AD maintains its original narrow scope — mandating a specific physical modification (decal installation) to address a specific operational safety issue (gas producer RPM limits). There is no evidence of scope creep; it does exactly what the background describes and nothing more."},"complexity_factors":["Very short document (under 300 words)","Only 3 defined elements: specific helicopter model, serial number range, and decal part number","Single, unambiguous compliance action with clear deadline (50 flight hours or 30 days)","No nested conditions or exceptions — only one alternative compliance path (previous completion)","No cross-references to other legislation beyond a single reference to a Canadian Transport Canada AD and Bell service bulletin","Simple binary applicability test (serial number in range or not)"],"plain_english_summary":"This AD requires owners/operators of Bell 407 helicopters (S/N 53000–53862) to install a cockpit warning decal reminding pilots of a gas-producer turbine speed limit when flying in high-altitude, cold conditions. It’s a mandatory safety measure to prevent overspeed-related engine damage.\n\nThe decal must be fitted promptly; the AD takes effect 7 May 2009."},"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":false,"description":"The AD's scope is limited to installing a cockpit decal on specified Bell 407 serial numbers to reflect a Flight Manual gas-producer RPM limitation; the instrument does not expand beyond that single, targeted requirement."},"complexity_factors":["Narrow applicability: specific to Bell 407 serial numbers 53000–53862 (Applicability)","Single, discrete action required: install specific decal P/N 407-070-008-101 (Requirement)","Short compliance window: within 50 flight hours or 30 days (Compliance)","Dependency on manufacturer's service bulletin and approved revisions creates limited regulatory discretion (Requirement references ASB 407-08-82 Rev A or later approved revisions)","Cross-reference to Transport Canada AD CF-2009-06 and two notes on acceptable earlier ASB compliance (Requirement/Notes)","No ongoing monitoring, testing, or complex operational change mandated—administrative installation only (Background/Requirement)"],"plain_english_summary":"**What it changes:** Requires operators of Bell 407 helicopters (serials 53000–53862) to install cockpit decal P/N 407-070-008-101 in accordance with BHTC Alert Service Bulletin ASB 407-08-82 (Rev A or later approved revision).\n\n**Why it matters:** The decal gives pilots a quick reference for a new gas-producer RPM limit introduced in Flight Manual Revision 7 for high-altitude and cold-temperature operations. Operators must comply within 50 flight hours or 30 days of the AD taking effect (effective 7 May 2009)."}},"importantCases":[],"_links":{"self":"/api/acts/ad-bell-407-35-gas-producer-rpm","history":"/api/acts/ad-bell-407-35-gas-producer-rpm/history","analysis":"/api/acts/ad-bell-407-35-gas-producer-rpm/analysis","conflicts":"/api/acts/ad-bell-407-35-gas-producer-rpm/conflicts","importantCases":"/api/acts/ad-bell-407-35-gas-producer-rpm/important-cases","documents":"/api/acts/ad-bell-407-35-gas-producer-rpm/documents"}}