{"id":"F2009L03200","name":"AD/BELL 427/11 - Flight Control Bearings","slug":"ad-bell-427-11-flight-control-bearings","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":140520,"registerId":"commonwealth-F2009L03200-current","compilationNumber":null,"startDate":"2026-04-03","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 427/11 | Flight Control Bearings | 10/2009 TX |\n| -------------- | ----------------------- | ---------- |\n\n| Applicability: | Bell Helicopter Textron Canada (BHTC) 427 Helicopters Serial number 56001 through 56073, 58001 and 58002.                                                                                                                                                                                                                                         |\n| -------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n| Requirement:   | Perform a one-time inspection and, if required, rectification of the affected parts as per Accomplishment Instructions of BHTC Alert Service Bulletin 427-09-25 dated7 April 2009, or later revisions approved by the Chief, Continuing Airworthiness, Transport Canada.Note: Transport Canada AD CF-2009-32 dated 24 July 2009 refers.           |\n| Compliance:    | Within the next 10 flight hours, but not later than 30 calendar days from the effective day of this AD, unless already accomplished.                                                                                                                                                                                                              |\n|                | This Airworthiness Directive becomes effective on 14 August 2009.                                                                                                                                                                                                                                                                                 |\n| Background:    | It has been determined that some bearings may not have been staked as required. Consequently, the functionality of affected parts may be limited. This situation, if not corrected, could lead to loss of control of the helicopter.BHTC Operational Safety Notice OSN GEN-09-38 dated 7 April 2009 provides further information on this subject. |\n\n![](image.001.png)  \nJames Coyne  \nDelegate of the Civil Aviation Safety Authority\n\n12 August 2009","sortOrder":0},{"sectionNumber":"AD/BELL 427/11","sectionType":"part","heading":"AD/BELL 427/11","content":"## AD/BELL 427/11","sortOrder":1},{"sectionNumber":"Flight Control Bearings","sectionType":"part","heading":"Flight Control Bearings","content":"## Flight Control Bearings","sortOrder":2},{"sectionNumber":"10/2009 TX","sectionType":"part","heading":"10/2009 TX","content":"## 10/2009 TX","sortOrder":3}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a standard single-issue Airworthiness Directive addressing a specific manufacturing defect in specific aircraft. It has not expanded beyond its original purpose of mandating inspection and repair of improperly staked bearings."},"complexity_factors":["Very short document (approximately 200 words of substantive content)","Only 3 defined elements: specific helicopter model, serial number range, and referenced service bulletin","Single straightforward requirement with clear alternative compliance path (10 flight hours OR 30 days)","No nested exceptions or conditional logic — one simple unless clause ('unless already accomplished')","Single cross-reference to Canadian Transport Canada AD CF-2009-32 for background only","Standard AD format with familiar sections (Applicability, Requirement, Compliance, Background)"],"plain_english_summary":"This CASA Airworthiness Directive orders owners/operators of Bell 427 helicopters (S/N 56001–56073, 58001–58002) to inspect and, if needed, repair or replace improperly staked flight‑control bearings per Bell ASB 427‑09‑25. The inspections were required within 10 flight hours or 30 days from 14 August 2009. It’s mandatory because bearing failure could lead to loss of control and a crash."},"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 enforces a one‑time inspection/rectification for the serial numbers listed and adopts the manufacturer’s service bulletin as the technical method. The instrument does not expand or narrow that set of helicopters beyond the stated applicability, and it retains the manufacturer and Transport Canada references as the basis for the required action."},"complexity_factors":["Narrow applicability: specific serial numbers (56001–56073, 58001–58002) reduces scope but requires tracking affected fleet.","Short compliance window: within 10 flight hours or 30 calendar days creates operational scheduling pressure.","Dependence on manufacturer service bulletin: work must follow BHTC Alert Service Bulletin 427‑09‑25 or later revisions approved by the Chief, Continuing Airworthiness (external document binding).","Technical requirement: inspection and possible rectification of flight‑control bearings requires qualified maintenance and parts.","Regulatory cross-reference: cites Transport Canada AD CF‑2009‑32 and BHTC OSN GEN‑09‑38, adding layers of authority and explanatory material.","Potential for downtime and direct costs to operators for inspection, repair and logistics.","Limited administrative discretion: later revisions require approval by the Chief, Continuing Airworthiness, constraining informal variance."],"plain_english_summary":"This Airworthiness Directive mandates a one-time inspection and, if necessary, repair of flight‑control bearings on specified Bell 427 helicopters, carried out in accordance with Bell Alert Service Bulletin 427‑09‑25 (or later revisions approved by the Chief, Continuing Airworthiness). Compliance is required within 10 flight hours or 30 days of the AD’s effective date (14 Aug 2009).\n\nIt affects owners/operators of serial numbers 56001–56073, 58001 and 58002, who must fund and arrange the work and may face short operational downtime. The AD responds to unstaked bearings that could limit control and risk loss of control (see Transport Canada AD CF‑2009‑32 and BHTC OSN GEN‑09‑38)."}},"importantCases":[],"_links":{"self":"/api/acts/ad-bell-427-11-flight-control-bearings","history":"/api/acts/ad-bell-427-11-flight-control-bearings/history","analysis":"/api/acts/ad-bell-427-11-flight-control-bearings/analysis","conflicts":"/api/acts/ad-bell-427-11-flight-control-bearings/conflicts","importantCases":"/api/acts/ad-bell-427-11-flight-control-bearings/important-cases","documents":"/api/acts/ad-bell-427-11-flight-control-bearings/documents"}}