AD/BELL 206/178 - Flight Control Bearings

The instrument operates as a classic airworthiness directive that imposes a mandatory inspection-and-rectification duty on a defined subset of aircraft. The core concepts to extract from the AD are: defined applicability, specified corrective action, an externally-authorised method of accomplishing the corrective action, a short compliance window, and cross-references to foreign continuing-airworthiness authority approvals.

Applicability is narrow and serial-number specific: Table 1 lists models and serial‑number ranges (for example, 206A serials 004 through 660 and 672 through 715; 206B converted from 206A all serial numbers; 206L serials 45004 through 45153 and 46601 through 46617; and further ranges for 206L‑1, 206L‑3 and 206L‑4). The AD targets only those airframes defined in that table; if an airframe is not listed, the AD as written does not prescribe action for it. The AD identifies the particular component area of concern as "Flight Control Bearings" (title and Background paragraph).

The corrective action is not drafted as a detailed engineering instruction inside the AD. Instead, the AD makes the Accomplishment Instructions of the applicable Alert Service Bulletin the mandatory method of compliance. The AD explicitly permits use of later revisions to those ASBs, but only if those revisions are approved by the Chief, Continuing Airworthiness, Transport Canada (Requirement paragraph). Thus, the AD delegates technical detail to the manufacturer ASBs while retaining regulatory control over which revisions are acceptable via Transport Canada approval.

The compliance window is short and two‑fold: within the next 10 flight hours, and in any case no later than 30 calendar days from the AD’s effective day (Compliance). That creates a fast timeline for operators to identify affected machines and schedule inspections.

The AD also signals international regulatory coordination: it references Transport Canada’s AD CF‑2009‑32 and BHTC Operational Safety Notice OSN GEN‑09‑38 dated 7 April 2009 as related material (Note). The AD therefore links CASA’s directive to both the manufacturer’s safety notice and Transport Canada’s continuing airworthiness process, making the latter the approval authority for later ASB revisions.

Finally, the safety rationale is explicit and limited: some bearings may not have been staked as required, which could limit functionality and, if uncorrected, could lead to loss of control (Background). The AD uses that operational hazard to justify the mandatory, immediate corrective step.

The AD directly affects owners and operators of the Bell 206 family aircraft identified in Table 1, including 206A, 206B (both converted and certain serial ranges), 206L, 206L‑1, 206L‑3 and 206L‑4 models with the serial numbers listed. For example, 206A serials 004-660 and 672-715 are listed; 206B converted from Model 206A covers all serial numbers; and other specific serial ranges are set out for the remaining variants. If an aircraft’s model and serial number appear in Table 1, the AD applies to that aircraft.

Maintenance organisations, licensed engineers, and persons responsible for continuing airworthiness of the affected aircraft are operationally implicated because the AD makes inspection and rectification mandatory within a short timeframe (Requirement and Compliance). These parties must obtain and follow the Accomplishment Instructions of the applicable Alert Service Bulletin (206‑09‑122 or 206L‑09‑156) dated 7 April 2009, or later ASB revisions approved by the Chief, Continuing Airworthiness, Transport Canada (Requirement and Table 2).

Regulators are also implicated in two ways. First, the Civil Aviation Safety Authority (CASA) is the issuer of the AD , the AD is signed by a CASA delegate (James Coyne) and carries an effective date (12 August 2009 signature; effective 14 August 2009). Second, the AD recognises Transport Canada as the approval authority for later ASB revisions (Requirement), making Transport Canada’s Chief, Continuing Airworthiness the gatekeeper for acceptable technical revisions. The AD also explicitly references Transport Canada AD CF‑2009‑32, indicating coordination or parallel action by the foreign authority (Note).

Aircraft lessors, insurers and lessees are second-order affected parties: aircraft that are non‑compliant within the compliance window remain subject to the safety risk described in the Background paragraph, and may be grounded by operators who adhere to the AD or by any regulator enforcing the AD. Parts suppliers and overhaul organisations are implicated to the extent they supply or replace flight control bearings or perform rectification work in accordance with the ASB instructions.

Pilots and operators are affected in that the AD identifies a potential loss‑of‑control hazard if the bearings are not staked correctly (Background). The AD’s compliance window and one‑time nature mean operators must prioritise affected aircraft for immediate inspection and remedy.

Duties imposed by the AD

• Inspect and rectify: The AD requires a one‑time inspection and, if required, rectification of the affected parts in accordance with the Accomplishment Instructions of the relevant Alert Service Bulletin dated 7 April 2009 (Requirement paragraph). The AD makes following those Accomplishment Instructions the mandatory method of compliance.

• Time-limited compliance: The inspection must be performed “within the next 10 flight hours, but not later than 30 calendar days from the effective day of this AD,” unless the action has already been accomplished (Compliance). That imposes a strict scheduling obligation on operators and maintenance organisations.

• Applicability adherence: The duty applies only to aircraft identified in Table 1 by model and serial number. Operators must determine applicability by comparing their aircraft serial numbers with Table 1.

Delegated technical discretion and limits on rights

• Use of revised ASBs is conditional: The AD permits the use of later revisions of the ASBs but only when those later revisions are approved by the Chief, Continuing Airworthiness, Transport Canada (Requirement). That imposes a constraint on operators’ ability to adopt manufacturer revisions without specified foreign-authority approval.

• Prescribed technical method: The AD does not describe alternative methods of compliance within its text. The technical means of compliance are prescribed through the ASB Accomplishment Instructions; any deviation or alternative method is not addressed in the AD and, by the plain wording, would require separate approval (the AD does not include any express alternative method of compliance clause).

Rights and entitlements (as expressed or implied in the AD document)

• Right to use approved later revisions: The AD expressly allows later revisions of the ASBs to be used where those revisions have been approved by the Chief, Continuing Airworthiness, Transport Canada (Requirement). That is a limited right: operators can adopt changes to the ASB provided they obtain or rely on that approval.

• Right to rely on the specified ASBs: The AD directs operators to specific ASBs (206‑09‑122 and 206L‑09‑156) dated 7 April 2009, so those documents are the normative technical standard cited. The AD thereby grants operators a clear path to compliance via those documents.

Matters not specified in the AD

• The AD does not specify record-keeping procedures, reporting obligations back to CASA, or penalties for non‑compliance within the instrument text itself. It also does not detail how to obtain Transport Canada approval for later ASB revisions. Those matters lie outside the express content of the AD and would, if necessary, be addressed under broader regulatory frameworks or by direct contact with the regulator or Transport Canada.

In short, the AD creates a mandatory, short‑term duty to inspect and rectify particular flight control bearings using the ASB instructions, and it allows later ASB revisions only under a specified foreign authority approval. It leaves procedural questions about record-keeping, alternative methods, and enforcement mechanics unaddressed within its own text.

The AD text itself does not set out penalties, sanctions or the specific enforcement processes that will be applied for non‑compliance. The document records the regulatory action (an airworthiness directive), the effective date (14 August 2009), and is signed by a CASA delegate (James Coyne, 12 August 2009), but it contains no express penalty clauses or enforcement steps within the printed AD language provided.

Because the source is limited to the AD content, the AD must be read as issuing the mandatory requirement and compliance timeline but without stating in‑document enforcement mechanisms or fine schedules. The AD does, however, operate as a formal regulatory instrument; its issuance by the Civil Aviation Safety Authority (via a delegate) is an official directive. Any enforcement mechanisms , including potential grounding of non‑compliant aircraft, administrative penalties, or other regulatory actions , are not described in this AD text. Those mechanisms would be governed by the wider regulatory and legislative framework under which CASA operates, which is not set out in the AD itself.

The AD does cross‑reference Transport Canada AD CF‑2009‑32 (Note) and ties mandatory compliance methods to the Accomplishment Instructions in the manufacturer’s Alert Service Bulletins or later revisions approved by the Chief, Continuing Airworthiness, Transport Canada (Requirement). That cross‑reference indicates coordination with another national continuing‑airworthiness authority, but it does not in the AD text create or state penalties or enforcement measures.

For practitioners requiring the specifics of enforcement , for example, what constitutes a regulatory breach, what administrative or criminal sanctions might attach, or what regulatory steps CASA would take to enforce flight restrictions or grounding , the AD itself is silent. Those enforcement-related questions therefore must be resolved by consulting the relevant enabling statutes, CASA regulatory instruments, or administrative practice documentation that are outside the four corners of this AD.

Within the AD’s text, direct interaction with other regulatory materials is limited to two explicit references: Transport Canada and the manufacturer’s safety documentation. The AD makes compliance dependent on Accomplishment Instructions contained in the applicable Alert Service Bulletin dated 7 April 2009, or later revisions approved by the Chief, Continuing Airworthiness, Transport Canada (Requirement paragraph). That creates an explicit regulatory link whereby CASA’s mandatory action refers to an ASB and accepts Transport Canada as the approval authority for later ASB revisions.

The AD also contains a Note that refers to Transport Canada AD CF‑2009‑32 dated 24 July 2009 and to BHTC Operational Safety Notice OSN GEN‑09‑38 dated 7 April 2009. By doing so, the AD acts in parallel with a Transport Canada AD and the manufacturer’s operational safety notice. The AD therefore creates a regime where CASA’s directive is consistent with, and anchored to, actions and documents produced by another civil aviation authority (Transport Canada) and by the manufacturer (BHTC).

The AD does not reference or modify statutes, regulations or guidance beyond those documents. It does not, within its text, amend or override other CASA instruments or specify how conflicts among regulatory instruments should be resolved. It simply prescribes action for affected aircraft and ties the technical method of compliance to the ASBs and Transport Canada approvals. Any interaction with broader aviation law , for example, the Civil Aviation Act or CASA’s enforcement regulations , is not stated in the AD and therefore must be located in CASA’s enabling legislation and policy documents outside this directive.

Because the AD does not specify reporting requirements, record-keeping, or administrative steps, its operational interaction with other legal obligations (such as mandatory defect reporting, continuing airworthiness record obligations, or contractual obligations between lessor and lessee) is not addressed in the text. Operators and maintainers will need to consider how complying with this AD intersects with those separate legal duties, but the AD itself remains confined to the single safety requirement and its linkage to ASBs and Transport Canada approvals.

In summary, the AD interacts directly and explicitly with:

• Manufacturer documentation: the Alert Service Bulletins 206‑09‑122 and 206L‑09‑156 (Table 2).
• Transport Canada: via the requirement that later ASB revisions be approved by the Chief, Continuing Airworthiness, Transport Canada, and the AD CF‑2009‑32 reference (Note).

It does not, within its own text, set out interactions with other statutory or regulatory instruments, enforcement mechanisms, or operator record-keeping obligations.

The instrument as provided shows a single issuance entry: it is AD/BELL 206/178 (10/2009 TX), effective 14 August 2009, signed by James Coyne, Delegate of the Civil Aviation Safety Authority, on 12 August 2009. The AD cites Alert Service Bulletins dated 7 April 2009 as the technical documents and allows the use of later revisions of those ASBs, but only where those later revisions are approved by the Chief, Continuing Airworthiness, Transport Canada (Requirement paragraph). The AD itself does not record any amendments, revisions, supersessions, or subsequent issue notifications within the provided text.

The AD’s wording explicitly contemplates the possibility of later ASB revisions becoming relevant, because it permits those later revisions to be used if they have the specified Transport Canada approval. That is not an amendment history of the AD itself, but an express mechanism by which the technical method of compliance may change over time with external approvals.

No further dates, amendment numbers, or subsequent CAS A action steps are recorded in the text presented. There is a Note referencing Transport Canada AD CF‑2009‑32 dated 24 July 2009 and BHTC OSN GEN‑09‑38 dated 7 April 2009; those references indicate related materials issued around the same time, but they do not constitute an amendment of the CASA AD in the document supplied.

Therefore, the AD as presented has this recorded chronology:

• 7 April 2009: BHTC Operational Safety Notice OSN GEN‑09‑38 and the Alert Service Bulletins (206‑09‑122 and 206L‑09‑156) dated 7 April 2009 are the technical provenance for the AD’s required actions (Requirement and Note).
• 24 July 2009: Transport Canada AD CF‑2009‑32 referenced in the AD’s Note.
• 12 August 2009: James Coyne, Delegate of CASA, dated the AD.
• 14 August 2009: The AD’s effective date.

No subsequent amendments, cancellations, supersessions, or revisions are recorded in the text provided. Any later amendments to the AD itself would need to be located in follow‑on CASA publications or regulatory notices that are not part of the source supplied here.

The AD document supplied does not include, cite, or record any litigation history. There are no cases, appeals, legal proceedings, or disputes referenced in the AD text. The document is an administrative airworthiness directive; it contains the directive text, tables of applicability and ASB references, a compliance window, a background safety rationale, and the signature of the CASA delegate. It does not record nor point to any judicial, administrative tribunal, or appeal outcomes.

Because the source contains no litigation or dispute information, no litigation history can be asserted on the basis of this document alone. Any legal challenges to the AD, enforcement actions taken for non‑compliance, or judicial review proceedings would need to be sought in court or administrative records external to the AD text supplied. Practitioners seeking litigation history must consult court records, CASA administrative records, or other public legal repositories; none of those sources are present in the AD instrument provided.

• Applicability is serial-number precise and non-contiguous: Table 1 contains multiple serial‑number ranges and discrete listings that are not continuous. For example, 206A is listed as serial numbers 004 through 660 and 672 through 715; certain 206B serial blocks and specific higher-numbered 206B serials are listed with gaps (for instance, serial numbers 661 through 671, then 716 through 4661, then 4663 through 4665, etc.). Operators must check the exact serial number on their aircraft against the table; assuming applicability by model alone risks misapplication or omission.

• “Converted from Model 206A, all serial numbers”: One line in Table 1 reads “206B Converted from Model 206A, all serial numbers.” That means any 206B that is a conversion from a 206A is included regardless of serial number. Determining whether an airframe is a conversion may require checking historical modification records; simply reading the model designation may not be sufficient.

• One-time action only: The AD requires a one‑time inspection and rectification as required per the ASB Accomplishment Instructions. It does not prescribe repetitive inspections or ongoing intervals. Parties should therefore ensure the one-time action is properly executed because the AD does not mandate subsequent checks.

• Short compliance window: The requirement to complete the inspection within 10 flight hours or 30 calendar days from the effective date, whichever comes sooner, gives limited time for scheduling, especially for aircraft deployed remotely or with booked operations. Delays in logistics, access to the ASB, or availability of qualified maintenance personnel could create compliance risk.

• Mandatory reference to ASBs dated 7 April 2009: The AD makes the ASB Accomplishment Instructions the mandatory method of compliance for the inspection and rectification. Operators must obtain and follow the correct ASB version or a later revision only if that later revision has the required Transport Canada approval. Using an unapproved ASB revision would not meet the AD’s expressed terms.

• Transport Canada approval gate for later ASB revisions: The AD allows later ASB revisions only with approval from the Chief, Continuing Airworthiness, Transport Canada. That means manufacturer-supplied revisions are not automatically acceptable unless that specific approval exists. Operators must confirm the revision’s approval status before relying on it.

• Cross-reference to TC AD: The Note references Transport Canada AD CF‑2009‑32 dated 24 July 2009 but does not explain whether CASA’s AD is identical, more restrictive, or otherwise different. Practitioners should review the referenced Transport Canada AD to understand parallel obligations or differences. The CASA AD itself does not contain a comparative analysis.

• No enforcement/recording details in the AD text: The AD does not specify how compliance is to be evidenced or reported to CASA, and it does not state explicit penalties within the document. Practitioners should not assume that the AD relieves them of other continuing airworthiness record‑keeping or reporting obligations under separate regulatory instruments.

• ASB access: The AD depends substantively on external ASB documents (206‑09‑122 and 206L‑09‑156) dated 7 April 2009. The AD text does not reproduce the technical steps, so access to, and reliance on, those ASBs is essential to compliance. Operators should verify they are using the correct ASB for their model/serial number and that the version they use is either the dated 7 April 2009 issue or a later revision approved by the specified Transport Canada authority.

• Risk described is loss of control: The Background paragraph is explicit that unstaked bearings could lead to loss of control. While the AD prescribes a one‑time fix, the operational consequence described is severe and justifies the short compliance window. Operators should therefore prioritise affected aircraft.

The AD provides a clear, limited pathway to compliance; the how-to steps below are drawn directly from the AD language and its tables.

1. Determine applicability using Table 1 in the AD. Compare your aircraft model and serial number to the exact serial-number ranges listed for 206A, 206B (including “Converted from Model 206A, all serial numbers”), 206L, 206L‑1, 206L‑3 and 206L‑4. If your airframe’s model/serial appears in Table 1, the AD applies.

2. Identify the applicable Alert Service Bulletin. Table 2 links the models to ASBs:

   • Models 206A and 206B: Alert Service Bulletin 206‑09‑122.
   • Models 206L, 206L‑1, 206L‑3 and 206L‑4: Alert Service Bulletin 206L‑09‑156. Obtain the ASB with Accomplishment Instructions dated 7 April 2009.

3. Note the permitted ASB versions. The AD allows the use of later revisions of the ASB, but only where those later revisions have been approved by the Chief, Continuing Airworthiness, Transport Canada. Before relying on a later ASB revision, confirm that such Transport Canada approval exists and document that approval source as part of the technical justification for compliance.

4. Perform the inspection and any required rectification strictly in accordance with the Accomplishment Instructions of the applicable ASB (as dated 7 April 2009 or as revised with Transport Canada approval). The AD makes those Accomplishment Instructions the method of compliance; do not improvise alternative inspection methods without a separate approved alternative method of compliance.

5. Meet the AD’s time limits. Execute the inspection within the next 10 flight hours but in any event not later than 30 calendar days from the effective day of the AD (the AD’s Compliance line). If the inspection and rectification have already been accomplished prior to the AD’s effective date, the AD’s action is satisfied.

6. Review related documents for additional technical detail. The AD’s Note points to BHTC Operational Safety Notice OSN GEN‑09‑38 dated 7 April 2009 and Transport Canada AD CF‑2009‑32 dated 24 July 2009. Those documents may provide supplementary information, clarifications, or context for the condition and can assist in executing the work. However, the AD mandates compliance via the ASB Accomplishment Instructions.

7. Ensure qualified personnel perform the work. Because the AD concerns flight control bearings and a potential loss‑of‑control hazard (Background), the inspection and rectification should be performed by appropriately licensed and qualified maintenance personnel authorised to conduct such work under the applicable maintenance regulations or organisational approvals.

8. Verify any parts and procedures used comply with the ASB. The ASB Accomplishment Instructions will specify acceptability criteria and any replacement or staking procedures necessary; those must be followed.

9. Document the work as required by your organisation’s technical records and any applicable continuing‑airworthiness requirements. The AD text does not itself specify recordkeeping or reporting requirements, but executing a formal maintenance entry itemising the AD reference (AD/BELL 206/178), the ASB used, the inspection findings, rectification performed, parts installed (if any), and certifying signatures will provide documentary evidence that the AD action has been completed in accordance with the AD.

10. If considering any deviation from the ASB Accomplishment Instructions or an alternative method of compliance, seek the appropriate regulatory approval before performing the deviation. The AD permits only later ASB revisions approved by Transport Canada and does not provide alternative compliance language; therefore any alternative method should be cleared by the relevant authority.

To repeat the essential compliance facts in one place: if your aircraft is listed in Table 1, you must, within the next 10 flight hours but no later than 30 calendar days from the AD’s effective date, perform the one‑time inspection and effect any necessary rectification in accordance with the Accomplishment Instructions of the applicable Alert Service Bulletin dated 7 April 2009, or the ASB’s later revision only if that later revision is approved by the Chief, Continuing Airworthiness, Transport Canada (Requirement and Compliance). The AD became effective on 14 August 2009 and is signed by the CASA delegate (effective/signature lines); BHTC OSN GEN‑09‑38 and Transport Canada AD CF‑2009‑32 are cross‑referenced in the AD’s Note for additional information.