{"id":"F2009L01566","name":"AD/BELL 427/9 - Hydraulic Pump - Driveshaft Assembly","slug":"ad-bell-427-9-hydraulic-pump-driveshaft-assembly","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":78292,"registerId":"commonwealth-F2009L01566-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"Bell Helicopter Textron 427 Series Helic","sectionType":"division","heading":"Bell Helicopter Textron 427 Series Helicopters","content":"### Bell Helicopter Textron 427 Series Helicopters\n\n| AD/BELL 427/9 | Hydraulic Pump - Driveshaft Assembly | 5/2009 |\n| ------------- | ------------------------------------ | ------ |\n\n| Applicability: | Bell Helicopter Textron Canada (BHTC) Model 427 helicopters serial numbers 56001 through 56046 and 58001 and 58002.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) 427-05-19 dated 7 January 2005.                                                                                                                                                                                                                                                                                |\n| -------------- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n| Requirement:   | 1. Verify the installation of the parts in accordance with BHTC Alert Service Bulletin (ASB) 427-08-22 dated 26 June 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 item 6.c. of ASB427-08-22, or later revisions approved by the Chief, Continuing Airworthiness, Transport Canada.Note: Transport Canada AD CF-2009-04 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 427/9","sectionType":"part","heading":"AD/BELL 427/9","content":"## AD/BELL 427/9","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_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 enforces a one-time verification and corrective action for specified Bell 427 serial numbers and excludes helicopters already modified per TB 427-05-19. It does not broaden applicability beyond those serial numbers, nor introduce ongoing recurring obligations; it simply sets inspection, corrective, and recordkeeping steps tied to existing maintenance events."},"complexity_factors":["Limited applicability by serial number but with a specific exclusion for helicopters equipped with input shaft P/N 407-340-107-101 and adapter P/N 407-340-108-101 installed per TB 427-05-19 (Applicability).","Simple, one-time physical verification task (verify plug and rivet presence) combined with a straightforward corrective step: install an airworthy input shaft and adapter if missing (Requirement).","Time-bound compliance windows tied to maintenance events: at next driveshaft lubrication or within 50 flight hours/30 days; spares must be verified prior to installation (Compliance).","Recordkeeping requirement: make a logbook entry or attach a serviceable tag to parts in inventory (Requirement, ASB 427-08-22).","Dependence on external service bulletin for procedural detail (BHTC ASB 427-08-22) and allowance for later revisions only if approved by the Chief, Continuing Airworthiness, Transport Canada (Requirement).","Operational cost and responsibility fall on aircraft operators/maintenance organisations: inspection labour, potential part replacement and administrative logging (implied by Requirement and Compliance).","Safety risk identified is loss of hydraulic pressure affecting control, which motivates a mandatory inspection but does not prescribe recurring inspections beyond the one-time check (Background)."],"plain_english_summary":"This Airworthiness Directive requires operators of Bell 427 helicopters (serial numbers 56001–56046, 58001–58002) to check that a hydraulic pump driveshaft contains its internal plug and the rivet that secures it, and to fit an airworthy input shaft and adapter if either is missing. The check must occur at the next driveshaft lubrication (or within 50 flight hours/30 days) and spares must be verified before installation; a logbook entry or serviceable tag is also required. Missing parts can cause hydraulic pressure loss and control difficulty."},"kimi_summary":{"content_quality":"ok","complexity_score":3,"scope_assessment":{"changed":false,"description":"This AD maintains its original narrow scope — a targeted safety inspection for a specific manufacturing defect in a specific helicopter model. It does not expand beyond the original safety purpose of verifying driveshaft assembly integrity."},"complexity_factors":["Multiple conditional applicability rules (serial number ranges plus specific part number exclusions)","Cross-reference to external technical documents (Bell Alert Service Bulletin 427-08-22 and Transport Canada AD CF-2009-04)","Dual compliance timelines depending on whether parts are installed or held as spares","Specific part number references (P/N 406-040-072-105, 407-340-107-101, 407-340-108-101) that require technical knowledge to interpret","Requirement for logbook entry or alternative tagging procedure for spare parts"],"plain_english_summary":"This CASA Airworthiness Directive mandates inspection of the hydraulic pump driveshaft assembly on specified Bell 427 helicopters (S/N 56001–56046, 58001–58002) to verify an internal plug and fastening rivet are fitted. If missing, operators must replace the input shaft and adapter before further flight. The AD prevents loss of hydraulic pressure and potential loss of control."}},"importantCases":[],"_links":{"self":"/api/acts/ad-bell-427-9-hydraulic-pump-driveshaft-assembly","history":"/api/acts/ad-bell-427-9-hydraulic-pump-driveshaft-assembly/history","analysis":"/api/acts/ad-bell-427-9-hydraulic-pump-driveshaft-assembly/analysis","conflicts":"/api/acts/ad-bell-427-9-hydraulic-pump-driveshaft-assembly/conflicts","importantCases":"/api/acts/ad-bell-427-9-hydraulic-pump-driveshaft-assembly/important-cases","documents":"/api/acts/ad-bell-427-9-hydraulic-pump-driveshaft-assembly/documents"}}