{"id":"F2009L03756","name":"AD/BELL 206/179 - Main Rotor Pitch Horn Bearing","slug":"ad-bell-206-179-main-rotor-pitch-horn-bearing","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":141626,"registerId":"commonwealth-F2009L03756-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 206/179 | Main Rotor Pitch Horn Bearing | 11/2009 |\n| --------------- | ----------------------------- | ------- |\n\n```html\n

Applicability:

Bell Helicopter Textron Canada (BHTC) helicopters as detailed in Table 1 of this AD.

Table 1.

Helicopter Model

Serial Number

206A

All serial numbers

206B

All up to 4660, including those converted from Model 206A

206L

45004 through 45153 and 46601 through 46617

206L-1

45154 through 45790

206L-3

51001 through 51612

206L-4

52001 through 52388

Requirement:

1. Inspect the bearing, P/N 206-011-105-001, in accordance with Accomplishment Instructions provided in the applicable Alert Service Bulletin listed in Table 2 of this AD dated 25 February 2009, or later revisions approved by the Chief, Continuing Airworthiness, Transport Canada.

Table 2.

Helicopter Model

Alert Service Bulletin

206A and 206B

206-09-120

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

206L-09-154

2. If, as a result of the inspection detailed in Requirement 1of this AD, the bearing needs to be replaced, replace it with a serviceable bearing.

Note: Transport Canada AD CF-2009-34 dated 25 August 2009 refers.

\n```\n\n| Compliance: | For Requirement 1 - Within 30 days after the effective date of this AD, unless previously accomplished.For Requirement 2 - Before further flight. |\n| ----------- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n| | This Airworthiness Directive becomes effective on 22 October 2009. |\n| Background: | It has been determined that some bearings, P/N 206-011-105-001, were manufactured without the required lubrication passage. If not corrected could lead to loss of control of the helicopter. |\n\n![](image.001.png) \nJames Coyne \nDelegate of the Civil Aviation Safety Authority\n\n10 September 2009","sortOrder":0},{"sectionNumber":"AD/BELL 206/179","sectionType":"part","heading":"AD/BELL 206/179","content":"## AD/BELL 206/179","sortOrder":1},{"sectionNumber":"Main Rotor Pitch Horn Bearing","sectionType":"part","heading":"Main Rotor Pitch Horn Bearing","content":"## Main Rotor Pitch Horn Bearing","sortOrder":2},{"sectionNumber":"11/2009","sectionType":"part","heading":"11/2009","content":"## 11/2009","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":3,"scope_assessment":{"changed":false,"description":"This AD maintains its original narrow scope — addressing a specific manufacturing defect in a single bearing part number across defined helicopter models. It has not expanded beyond its initial safety purpose."},"complexity_factors":["Short, single-purpose directive with only 2 requirements","Clear applicability table specifying exact helicopter models and serial number ranges","Cross-references to external technical documents (Alert Service Bulletins) for detailed inspection procedures rather than embedding them","Simple conditional logic: if inspection finds fault → replace before flight","No nested exceptions or complex defined terms","Straightforward compliance timeline (30 days for inspection, immediate for replacement)"],"plain_english_summary":"This CASA Airworthiness Directive requires owners/operators of certain Bell 206 series helicopters (specified serial numbers) to inspect main rotor pitch-horn bearings (P/N 206-011-105-001) within 30 days for a missing lubrication hole and to replace any faulty bearing before further flight. It applies to Australian operators and maintenance organisations because a failed bearing could lead to loss of helicopter control."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The AD maintains a targeted scope: it applies only to listed Bell 206 variants and serial number ranges and to bearing P/N 206-011-105-001. It mandates inspection per the cited Alert Service Bulletins and replacement where required, consistent with the instrument's stated corrective objective."},"complexity_factors":["Narrow technical focus: single part number (P/N 206-011-105-001) and specific component (main rotor pitch‑horn bearing).","Applicability limited by helicopter models and serial number ranges (Table 1), requiring operators to check fleet lists.","Work defined by manufacturer Alert Service Bulletins (206-09-120 or 206L-09-154) rather than detailed procedures in the AD itself (Table 2).","Short compliance windows: inspection within 30 days and replacement before further flight increase operational disruption risk.","Regulatory approval point: later revisions to the Alert Service Bulletin require approval by the Chief, Continuing Airworthiness, Transport Canada (Requirement 1).","Safety-critical consequence (potential loss of control) creates priority and low tolerance for non‑compliance."],"plain_english_summary":"Requires inspection of the main rotor pitch‑horn bearing (P/N 206‑011‑105‑001) on specified Bell 206‑series helicopters using the procedures in the listed Alert Service Bulletins, and replacement with a serviceable bearing if the inspection finds a defect (Requirement 1 & 2). Inspections must be done within 30 days and any replacement must be completed before further flight; the AD responds to bearings that were made without a required lubrication passage that could cause loss of control."}},"importantCases":[],"_links":{"self":"/api/acts/ad-bell-206-179-main-rotor-pitch-horn-bearing","history":"/api/acts/ad-bell-206-179-main-rotor-pitch-horn-bearing/history","analysis":"/api/acts/ad-bell-206-179-main-rotor-pitch-horn-bearing/analysis","conflicts":"/api/acts/ad-bell-206-179-main-rotor-pitch-horn-bearing/conflicts","importantCases":"/api/acts/ad-bell-206-179-main-rotor-pitch-horn-bearing/important-cases","documents":"/api/acts/ad-bell-206-179-main-rotor-pitch-horn-bearing/documents"}}