{"id":"F2009L03192","name":"AD/BELL 206/178 - Flight Control Bearings","slug":"ad-bell-206-178-flight-control-bearings","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":140498,"registerId":"commonwealth-F2009L03192-current","compilationNumber":null,"startDate":"2026-04-03","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"Bell Helicopter Textron Canada (BHTC) 20","sectionType":"division","heading":"Bell Helicopter Textron Canada (BHTC) 206 and Agusta Bell 206 Series Helicopters","content":"### Bell Helicopter Textron Canada (BHTC) 206 and Agusta Bell 206 Series Helicopters\n\n| AD/BELL 206/178 | Flight Control Bearings | 10/2009 TX |\n| --------------- | ----------------------- | ---------- |\n\n```html\n

Applicability:

Bell Helicopter Textron Canada (BHTC) Helicopter Models as listed in Table 1 of this AD.

Table 1

Model

Serial Number

206A

004 through 660 and 672 through 715

206B

Converted from Model 206A, all serial numbers

206B

Serial number 661 through 671 and 716 through 4661, 4663 through 4665, 4667 and 4670

206L

Serial number 45004 through 45153 and 46601 through 46617

206L-1

Serial number 45154 through 45790

206L-3

Serial number 51001 through 51612

206L-4

Serial number 52001 through 52389, 52391 and 52393

Requirement:

Perform a one-time inspection and, if required, rectification of the affected parts as per Accomplishment Instructions of the applicable Alert Service Bulletin (listed in Table 2) dated 7 April 2009, or later revisions approved by the Chief, Continuing Airworthiness, Transport Canada.

Table 2

206A, 206B

206-09-122

206L, 206L-1, 206L-3, 206L-4

206L-09-156

Note: Transport Canada AD CF-2009-32 dated 24 July 2009 refers.

\n```\n\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| ----------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\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 206/178","sectionType":"part","heading":"AD/BELL 206/178","content":"## AD/BELL 206/178","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":{"flash_summary":{"complexity_score":5,"scope_assessment":{"changed":false,"description":"The AD's scope is limited to the Bell 206 models and serial numbers listed in Table 1 and requires a one‑time inspection/rectification per the Alert Service Bulletins dated 7 April 2009 (Table 2). It does not broaden applicability beyond the listed aircraft or impose recurring inspection intervals; compliance timing and Transport Canada approval provisions are explicit."},"complexity_factors":["Detailed applicability: multiple models with many specific serial‑number ranges (Table 1).","Different Alert Service Bulletins apply by model (Table 2), so operators must use the correct SB.","Conditional workflow: mandatory inspection plus conditional rectification (“if required”) increases decision points.","Tight compliance window: within 10 flight hours or 30 calendar days imposes scheduling pressure and potential downtime.","Regulatory discretion: later revisions only acceptable if approved by the Chief, Continuing Airworthiness, Transport Canada.","Safety‑critical consequence (risk of loss of control) raises enforcement and operational urgency.","Cross-reference to Transport Canada AD CF‑2009‑32 indicates international coordination of requirements.","Potential for maintenance cost and parts‑replacement burden where rectification is required."],"plain_english_summary":"Requires operators of specified Bell/Agusta Bell 206-series helicopters (listed by model and serial number) to carry out a one‑time inspection and, if necessary, repair of flight‑control bearings following the Accomplishment Instructions in the listed Alert Service Bulletins. Compliance is mandatory within 10 flight hours or 30 calendar days; Transport Canada approval is required for later SB revisions. The AD responds to unstaked bearings that may limit part functionality and could lead to loss of control."},"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":3,"scope_assessment":{"changed":false,"description":"This is a standard safety directive maintaining its original purpose: addressing a specific manufacturing defect in flight control bearings. No scope creep detected."},"complexity_factors":["Short, single-purpose directive with one main requirement","Two simple tables defining applicability (7 helicopter models with serial number ranges) and reference documents (2 service bulletins)","Clear compliance deadline (10 flight hours or 30 days)","No nested exceptions or conditional logic — straightforward 'inspect and fix if needed' instruction","References external technical documents (service bulletins) but does not reproduce their content","Minimal defined terms — relies on standard aviation terminology"],"plain_english_summary":"This CASA Airworthiness Directive mandates a one‑time inspection of flight‑control bearings on specified Bell 206 series (including Agusta-built) helicopters to check for improperly staked bearings. Owners/operators must follow Bell’s service instructions and repair any defects. Action is required within 10 flight hours or 30 days from 14 August 2009 to prevent possible flight‑control failure and loss of control."}},"importantCases":[],"_links":{"self":"/api/acts/ad-bell-206-178-flight-control-bearings","history":"/api/acts/ad-bell-206-178-flight-control-bearings/history","analysis":"/api/acts/ad-bell-206-178-flight-control-bearings/analysis","conflicts":"/api/acts/ad-bell-206-178-flight-control-bearings/conflicts","importantCases":"/api/acts/ad-bell-206-178-flight-control-bearings/important-cases","documents":"/api/acts/ad-bell-206-178-flight-control-bearings/documents"}}