{"id":"F2009L01568","name":"AD/BELL 407/34 - Hydraulic Pump - Driveshaft Assembly","slug":"ad-bell-407-34-hydraulic-pump-driveshaft-assembly","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":78298,"registerId":"commonwealth-F2009L01568-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 407/34 | Hydraulic Pump - Driveshaft Assembly | 5/2009 |\n| -------------- | ------------------------------------ | ------ |\n\n| Applicability: | Bell Helicopter Textron Canada (BHTC) Model 407 helicopters serial number 53000 through 53408 and 53421 through 53459.This AD does not affect helicopters equipped with input shaft part number (P/N)407-340-107-101 and adapter P/N 407-340-108-101, installed in accordance with Technical Bulletin (TB) 407-01-30 Revision A dated 21 May 2003.                                                                                                                                                                                                                                                                        |\n| -------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n| Requirement:   | 1. Verify the installation of the parts in accordance with BHTC Alert Service Bulletin (ASB) 407-08-83 dated 22 May 2008, or later revisions approved by the Chief, Continuing Airworthiness, Transport Canada.2. If any part is missing, install an airworthy input shaft and adapter.3. If the parts are correctly installed, make a logbook entry to that effect or attach the serviceable tag to the parts in inventory as per Part 1 item 3 of ASB407-08-83, or later revisions approved by the Chief, Continuing Airworthiness, Transport Canada.Note: Transport Canada AD CF-2009-03 dated 22 January 2009 refers. |\n| Compliance:    | For all driveshaft assemblies installed on aircraft - At the next driveshaft lubrication, no later than 50 flight hours or 30 calendar days, whichever comes first after the effective date of this AD.For driveshaft assemblies held as spares - Prior to installation on an aircraft.                                                                                                                                                                                                                                                                                                                                   |\n|                | This Airworthiness Directive becomes effective on 7 May 2009.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             |\n| Background:    | It has been determined that some hydraulic pump driveshaft assemblies P/N406-040-072-105 may have been delivered with a missing internal plug or fastening rivet. This condition, if not corrected, could result in a loss of hydraulic pressure leading to difficulty controlling the helicopter.                                                                                                                                                                                                                                                                                                                        |\n\n| \\   | This AD mandates a one-time verification of the presence of the plug in the centre of the driveshaft and the rivet that holds the plug in place. |\n| --- | ------------------------------------------------------------------------------------------------------------------------------------------------ |\n\n![](image.001.png)  \nJames Coyne  \nDelegate of the Civil Aviation Safety Authority\n\n26 March 2009","sortOrder":0},{"sectionNumber":"AD/BELL 407/34","sectionType":"part","heading":"AD/BELL 407/34","content":"## AD/BELL 407/34","sortOrder":1},{"sectionNumber":"Hydraulic Pump - Driveshaft Assembly","sectionType":"part","heading":"Hydraulic Pump - Driveshaft Assembly","content":"## Hydraulic Pump - Driveshaft Assembly","sortOrder":2},{"sectionNumber":"5/2009","sectionType":"part","heading":"5/2009","content":"## 5/2009","sortOrder":3}],"analysis":{"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The AD implements a discrete, one-time corrective verification and rectification targeted at driveshaft assemblies on specified serial-numbered Bell 407 helicopters and excludes helicopters already modified per TB 407-01-30 Rev A. It also explicitly applies the requirement to spares prior to installation. These measures are consistent with the AD's stated corrective purpose and do not expand scope beyond that stated remedy."},"complexity_factors":["Applicability is limited to specific serial-number ranges with an explicit exception tied to parts installed per TB 407-01-30 Revision A (adds parsing work for operators).","Technical dependence on exact part numbers (P/N 406-040-072-105; input shaft/adaptor P/Ns) requires parts-level verification.","Compliance timing: one-time check at next driveshaft lubrication or within 50 flight hours/30 days, and prior-to-installation rule for spares (multiple operational paths).","Mandate references external documents (BHTC ASB 407-08-83, TB 407-01-30, Transport Canada AD CF-2009-03) requiring cross-referencing to determine approved procedures.","Administrative proof requirement: logbook entry or serviceable tag for parts in inventory (creates recordkeeping burden).","Safety consequence is concrete (loss of hydraulic pressure from missing plug/rivet), but the corrective action is a discrete, one-time physical check/installation."],"plain_english_summary":"This Airworthiness Directive requires operators of specified Bell 407 serial-numbered helicopters to check one hydraulic pump driveshaft part (P/N 406-040-072-105) for a central plug and rivet, and to install an airworthy input shaft and adapter if the plug or rivet is missing. It excludes helicopters already modified with input shaft P/N 407-340-107-101 and adapter P/N 407-340-108-101 installed per TB 407-01-30 Rev A.\n\nOperators and maintenance providers must do the check at the next driveshaft lubrication (or within 50 flight hours/30 days) or before installing spares; proof is a logbook entry or serviceable tag (Requirement; Compliance)."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a standard, targeted airworthiness directive addressing a specific manufacturing defect in a particular helicopter model. The scope remains precisely limited to verifying and correcting a known safety issue with hydraulic pump driveshaft assemblies."},"complexity_factors":["Single, clearly defined applicability (specific serial number ranges with one explicit exemption)","Straightforward three-step requirement (verify, replace if needed, document)","Simple compliance timeline with clear alternatives (50 flight hours OR 30 days)","Only two cross-references (to a Bell Helicopter service bulletin and a Transport Canada AD)","No nested definitions, conditional logic, or interpretive provisions","Total length is approximately one page"],"plain_english_summary":"This CASA Airworthiness Directive requires owners/operators of specified Bell 407 helicopters (S/N 53000–53408, 53421–53459) to inspect the hydraulic pump driveshaft assembly for a missing internal plug or rivet and replace parts if missing; spares must be checked before installation. It excludes helicopters already fitted with certain 2003-upgrade parts. A missing plug/rivet can cause loss of hydraulic pressure and serious control hazards; compliance is required at the next lubrication or within 50 flight hours/30 days."},"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"}},"importantCases":[],"_links":{"self":"/api/acts/ad-bell-407-34-hydraulic-pump-driveshaft-assembly","history":"/api/acts/ad-bell-407-34-hydraulic-pump-driveshaft-assembly/history","analysis":"/api/acts/ad-bell-407-34-hydraulic-pump-driveshaft-assembly/analysis","conflicts":"/api/acts/ad-bell-407-34-hydraulic-pump-driveshaft-assembly/conflicts","importantCases":"/api/acts/ad-bell-407-34-hydraulic-pump-driveshaft-assembly/important-cases","documents":"/api/acts/ad-bell-407-34-hydraulic-pump-driveshaft-assembly/documents"}}