AD/BELL 206/130 Amdt 1 - Main Landing Gear Cross Tubes (Aeronautical Accessories Inc.)

The instrument operates as a normative directive that makes specific manufacturer documents mandatory for a defined group of aircraft components. Core concepts in the text are applicability, identification, normative documents, two-tier requirements (initial modification and recurring inspections), model-specific compliance windows, and amendment scope.

Applicability is narrow and component-specific: "All models of Bell 206 and Agusta Bell 206 helicopters fitted with crosstubes manufactured by Aeronautical Accessories Incorporated" (Applicability). Identification of the affected parts is delegated to the manufacturer’s ASBs; the AD states the Aeronautical Accessories crosstubes can be identified by a serial number stamped on the end of the crosstube as described in Aeronautical Accessories ASB 94045, Appendix A or ASB 94046, Appendix A (Note). This makes the ASB appendices the practical means of determining whether an individual airframe is captured.

Normative documents are named precisely: Aeronautical Accessories ASB 94045 for models 206A and 206B, ASB 94046 for 206L, Aeronautical Accessories Report AA-94022 Revision A for 206A/B, and Report AA-94023 for 206L (Requirement). The AD therefore elevates these ASBs and Reports from advisory material to required procedure for the covered aircraft.

There are two regulatory tiers. Requirement 1 is an inspect-and-modify step that is time-limited to an initial compliance window tied to calendar dates and flight hours. Requirement 2 is a continuing inspection regime, imposed after Requirement 1 is satisfied, with a first recurrence deadline and ongoing repeat intervals set at "not to exceed 300 hours time in service or 1 year, whichever occurs first" (Compliance, para 2).

The AD is an amendment (Amdt 1) and contains explicit change notes in the background: it extends applicability to the 206L series and includes the yearly inspection interval limit. The stated safety trigger is empirical: two severe cracking events occurred in Australia in cross tubes not made by Aeronautical Accessories, and Aeronautical Accessories issued instructions intended to avoid similar failures in their product (Background).

Underlying mechanisms are therefore: (1) identification of affected parts by serial number, (2) mandatory execution of manufacturer-prescribed inspection and modification procedures within defined windows, and (3) continuing monitoring at fixed time-or-hour intervals. The AD does not itself include technical details of the inspections or modifications, rather it incorporates those details by reference to the manufacturer documents.

The AD applies to all Bell 206 and Agusta Bell 206 series helicopters that are fitted with cross tubes manufactured by Aeronautical Accessories Incorporated (Applicability). Practically, the primary parties who carry the obligation are aircraft owners, operators, and any maintenance organisations responsible for continuing airworthiness of those helicopters, because the AD prescribes maintenance actions (inspect and modify, recurring inspections) that are typically executed under those parties’ maintenance control.

Aeronautical Accessories Incorporated is indirectly affected as the supplier of the referenced ASBs and Reports: the AD depends on their service documents for part identification (serial number stamping described in ASB 94045/94046, Appendix A), on the procedural steps of the inspect-and-modify action (ASB 94045/94046), and on the content of the recurring inspection programmes (Reports AA-94022 Rev A and AA-94023) (Requirement, Note). The AD therefore makes the manufacturer’s documentation operationally central to compliance.

Regulators and inspectors within the Commonwealth framework are stakeholders, since the instrument sits in the Civil Aviation Safety Authority Schedule of Airworthiness Directives and becomes an enforceable direction under that framework (header). The AD’s effective date (27 April 1995) creates a start point for regulatory oversight.

Maintenance facilities and technicians who perform the inspections and modifications will bear the operational tasks. Because the AD references specific ASBs and Reports for the work, those service documents will determine the technical scope of the labour, parts, and tools required. The AD itself does not list required parts or materials; it requires conformity with the referenced documents.

Owners and operators who do not have Aeronautical Accessories cross tubes are not within the stated applicability, even though the background notes cracking incidents involving cross tubes manufactured by other suppliers. The AD therefore affects a defined subset of the Bell 206 fleet. Aircraft managers must determine applicability by checking the crosstube serial number as described in the ASB appendices (Note).

Finally, insurers, lessees and lessors of the affected aircraft may be indirectly affected because compliance with airworthiness directives typically factors into airworthiness status and insurability. The AD text itself does not set out contractual or insurance consequences, but it does create an enforceable maintenance standard for the specified parts and aircraft.

Duties established by the AD are concrete and document-specific. There are two principal duties:

1. Duty to inspect and modify the Aeronautical Accessories crosstubes in accordance with Aeronautical Accessories ASB 94045 for models 206A and 206B or ASB 94046 for 206L series, as applicable (Requirement 1). This is a mandatory, one-off action with model-specific compliance windows (Compliance, para 1).

2. Duty to inspect the Aeronautical Accessories crosstubes in accordance with Aeronautical Accessories Report AA-94022 Revision A for models 206A and 206B or Report AA-94023 for the 206L series, as applicable (Requirement 2). This is a recurring inspection obligation that must first be carried out within 300 hours time in service after compliance with Requirement 1, and then repeated at intervals not to exceed 300 hours time in service or 1 year, whichever occurs first (Compliance, para 2).

The AD requires operators to identify affected parts by serial number as described in ASB 94045 Appendix A or ASB 94046 Appendix A (Note). That identification task is therefore a prerequisite duty to determine whether the AD binds a particular airframe.

The directive establishes timing duties that combine calendar time and service hours. For models 206A and 206B the Requirement 1 work must be done "before 2 months or 100 hours time in service after 2 March 1995, whichever occurs later" (Compliance). For 206L series the corresponding deadline is "before 2 months or 100 hours time in service after 27 April 1995, whichever occurs later" (Compliance). The recurring inspection duty for Requirement 2 is expressed as an interval not to exceed 300 hours or 1 year, creating two alternative limits.

Rights are not articulated in the AD text. The instrument does not include procedural language about appeals, exemptions, approvals, or alternative means of compliance. The AD references Aeronautical Accessories’ own documents as the method for compliance, but it does not in the text grant or deny the availability of alternative compliance methods, delegated approvals, or cost reimbursement. Practically, the absence of such language in the AD means that any rights or alternative pathways must be sought through the broader regulatory framework under which the AD is issued, not within the text of the AD itself. The AD’s text is silent on approval processes, equivalence determinations, or time-limited exemptions.

The AD creates an operational duty structure where the owner/operator must both make a binary determination of applicability and then carry out or arrange the technical work in line with the referenced ASBs and Reports within the specified windows. The ASBs and Reports themselves are normative within this AD; following their steps is prescribed as compliance.

The AD text does not specify penalties, sanctions, or the mechanics of enforcement. It is presented as an item in the Commonwealth Schedule of Airworthiness Directives under the Civil Aviation Regulations 1998, Part 39, Civil Aviation Safety Authority (header). The instrument is effective from 27 April 1995 (final line), and it imposes mandatory maintenance actions and repeated inspection obligations. The text does not set out penalties for non-compliance, nor does it describe inspection, audit, or enforcement procedures.

Because the AD is expressed as a directive in the regulatory schedule, the practical enforcement environment will depend on the broader regulatory apparatus under which the AD was issued; however, the AD itself contains no enforcement provisions. The AD also does not set out an administrative or judicial review mechanism, nor does it refer to any notification or certification requirements to demonstrate compliance in the AD text.

From a practical compliance-cost perspective, the instrument imposes obligations that create predictable cost and operational effects for affected operators. The Requirement 1 inspect-and-modify action will require inspection labour, any modification work as described in the ASBs, and potential aircraft downtime. Requirement 2 establishes a recurring maintenance burden at a maximum interval of 300 hours time in service or one year. Those costs are borne by the owner/operator or their maintenance provider. The ASBs and Reports, by defining the scope of work, will determine specific parts, inspection techniques, and labour times that affect direct costs. The AD does not provide funding, subsidies, or compensation for the work.

Because the AD does not describe enforcement mechanisms, the likelihood and form of regulatory action in the event of non-compliance is not addressed in the text. The instrument indicates regulatory intent to require the work; operational enforcement actions or penalties would have to be sourced from the broader Civil Aviation Regulations or administrative procedures, but such mechanisms are not contained in the AD itself.

The AD is framed as a Schedule entry under the Commonwealth of Australia (Civil Aviation Regulations 1998), Part 39, listing of the Civil Aviation Safety Authority (header). That places the instrument within a statutory regulatory framework that governs civil aviation safety in Australia, at least insofar as the AD is recorded under that heading. The AD accordingly functions as a subordinate instrument that prescribes specific continuing airworthiness actions under that regulatory umbrella.

The AD incorporates manufacturer service documents by reference: Aeronautical Accessories ASB 94045, ASB 94046, Report AA-94022 Rev A, and Report AA-94023 (Requirement). The text therefore creates a normative link between the regulatory instrument and private manufacturer publications. Compliance with the AD requires compliance with those documents. The AD also uses the manufacturer documentation for part identification (Note). That creates a practical interaction where private technical material becomes mandatory as part of the statutory airworthiness regime.

There is no explicit mention in the AD text of interactions with other airworthiness directives, exemptions, or foreign regulatory actions. The AD does not state that it supersedes, amends, or is subordinate to any other specific ADs. The only explicit amendment history in the text is that this instrument is "Amdt 1" and that it extends applicability to the 206L series and includes the yearly inspection interval limit (Background). No cross-references to other legal instruments or statutory provisions are provided in the text.

Because the AD specifies calendar and time-in-service deadlines and inspection intervals, it interacts operationally with maintenance schedules, logbooks, and maintenance control programs used by operators. The AD itself does not set out the recordkeeping practices that would demonstrate compliance; those processes are typically part of broader regulatory or operational regimes. The AD also does not articulate how compliance with the ASBs/Reports should be evidenced in maintenance records.

In sum, the AD functions as a binding, component-specific requirement embedded in the Civil Aviation Regulations schedule and explicitly imports manufacturer documents as normative. The text does not elaborate on cross-instrument precedence, enforcement mechanics, or administrative review, so those interactions must be inferred from the surrounding regulatory framework and are not specified in the instrument.

The instrument title shows this entry as AD/BELL 206/130 Amdt 1 and the printed date reference "5/95" (header). The text states “This amendment is effective from 27 April 1995” (Compliance section end). The Background paragraph records the substantive change effected by this amendment: it "extends applicability to the 206L series and includes the yearly inspection interval limit." That is the explicit amendment content set out in the AD.

Beyond single-line statements, the AD does not include a chronology of earlier versions, nor does it reproduce the original AD text for comparison. The designation "Amdt 1" indicates a first amendment to the original AD/BELL 206/130, but the original AD text and its date are not included in the provided instrument. The AD gives two compliance deadlines, one referencing 2 March 1995 for 206A/B models and the other referencing 27 April 1995 for 206L series. The presence of two different dates suggests the amendment either added the 206L series with a different effective start date, or adjusted timing for different model groups; the Background clarifies that the amendment extends applicability to the 206L series and includes a yearly inspection interval.

No further amendments, rescissions, or supersessions are recorded in the text. The AD does not include a sunset clause or an expiry date; it establishes ongoing recurring inspection intervals (Requirement 2) to continue indefinitely, subject to the stated maximum intervals. The instrument’s effective date furnishes a clear legal start for the amendment.

Where the AD makes the manufacturer’s ASBs and Reports normative, it thereby creates an operational dependence on any future revisions those documents might undergo. The AD references a specific revision for Report AA-94022 (Revision A), indicating that the AD was precise about which version of that report was incorporated. For the other documents the AD cites ASB 94045, ASB 94046 and Report AA-94023 without further revision numbering in the AD text.

In this instrument the amendment history that is recorded is limited to: (1) Amdt 1 designation, (2) effective date 27 April 1995, and (3) the specific expansion of scope to 206L and the inclusion of a yearly inspection interval limit. No subsequent amendments are recorded in the supplied text.

The AD text contains no litigation history. There are no references to court proceedings, administrative appeals, or prior legal challenges in the instrument. The document does not record any disputes about its validity, scope, or enforcement. The Background describes safety incidents,two instances of severe cracking of cross tubes not manufactured by Aeronautical Accessories occurring within Australia,but it does not link those incidents to any litigation or adjudication.

Because the AD is supplied as an isolated instrument, if there were litigation arising from it, those proceedings are not documented in the provided text. The AD itself does not set out dispute resolution paths, appeal mechanisms, or judicial review information. Any legal challenges or compliance disputes that have occurred or might occur would be handled under the broader regulatory or judicial framework, but the AD does not record or reference such matters.

Accordingly, the instrument as supplied gives no litigation record to analyse. The only empirical events recorded in the text are the two cracking instances that provided the safety rationale for issuing the manufacturer instructions and the AD; those are presented as background facts rather than as subjects of legal proceedings.

1. Applicability is component-specific and not fleet-wide. The AD applies only to Bell 206 and Agusta Bell 206 helicopters fitted with cross tubes manufactured by Aeronautical Accessories Incorporated. If an operator assumes the AD applies to all Bell 206 helicopters without checking cross tube manufacturer and serial number, they may misidentify their obligations. The text explicitly requires identification "by a serial number stamped on the end of the crosstube as described in Aeronautical Accessories Alert Service Bulletin (ASB) 94045, Appendix A or ASB 94046, Appendix A" (Note). Operators must therefore consult the ASB appendices to determine applicability.

2. Two separate document sets are normative and must be matched to the correct models. Requirement 1 references ASB 94045 for 206A/206B and ASB 94046 for 206L. Requirement 2 references Report AA-94022 Revision A for 206A/206B and Report AA-94023 for 206L (Requirement). Using the wrong ASB or report for a model would fail to meet the AD’s explicit text.

3. Timelines combine calendar dates and flight hours in ways that can produce counterintuitive deadlines. For 206A and 206B the Requirement 1 action must be done "before 2 months or 100 hours time in service after 2 March 1995, whichever occurs later" (Compliance). For 206L the anchor date is 27 April 1995. If an aircraft has low utilization, the "whichever occurs later" phrasing may push the effective deadline further into the future; conversely, high-utilisation aircraft may hit the 100-hour trigger quickly. Operators must compute both metrics to determine the actual deadline.

4. Recurring inspections are bounded by two alternative limits with the shorter effective interval dominating. Requirement 2 must be completed "within 300 hours time in service from compliance with Requirement 1" and then "repeat the inspection at intervals not to exceed 300 hours time in service or 1 year, whichever occurs first" (Compliance). This means that if an aircraft accumulates 300 hours in less than one year, the interval will be the 300-hour mark. If it accumulates fewer hours over a year, the calendar year limit applies. Operators must track both hours and dates to avoid missing the sooner event.

5. The AD incorporates private technical documents without reproducing technical details. The AD itself does not include the inspection or modification steps. Compliance requires access to ASB 94045, ASB 94046, Report AA-94022 Revision A and Report AA-94023. Failure to follow the exact procedures in those documents, or to use an incorrect edition (except where a revision is specified), could mean non-compliance with the AD even if a similar inspection or modification is performed.

6. The AD’s Background references cracking events in cross tubes not manufactured by Aeronautical Accessories, but the directive is limited to Aeronautical Accessories components. That means an operator whose aircraft uses non-Aeronautical Accessories cross tubes will not be bound by this AD, but the background event still signals potential broader risk. The AD does not require preventive actions for non-Aeronautical Accessories parts.

7. The AD does not include enforcement language or prescribed evidence of compliance. The instrument does not specify how compliance will be demonstrated to regulators, nor does it mandate recordkeeping practices in the AD text. Operators should therefore consider that evidence of compliance may be required under broader regulatory obligations, but the AD does not itself set those documentation requirements.

8. Report AA-94022 is cited as Revision A, while the other documents lack revision notation in the AD text. This specificity indicates that the AD is selective about which version of the report is mandatory; operators should not assume that later revisions of AA-94022 are automatically included by the AD.

9. The AD’s amendment status and dates mean there are two different initial compliance windows referenced. For 206A/B the anchor date is 2 March 1995; for 206L the anchor date is 27 April 1995. Make sure calculations use the correct anchor date for the model in question.

10. The AD does not state whether alternative methods of compliance are permitted. If an operator believes an alternate inspection or modification method is equivalent, the AD text does not record whether such alternatives would be acceptable. Any request for a different means of compliance would therefore need to be addressed under the regulatory framework outside the AD text.

The AD specifies a small number of concrete steps; compliance requires following those steps and the referenced manufacturer documents exactly.

1. Determine applicability. Check whether the aircraft is a Bell 206 or Agusta Bell 206 series helicopter and whether the main landing gear cross tube was manufactured by Aeronautical Accessories Incorporated. Use the serial number stamping on the end of the crosstube, as described in Aeronautical Accessories ASB 94045, Appendix A or ASB 94046, Appendix A, to confirm manufacturer and part identity (Applicability; Note). If the crosstube is not an Aeronautical Accessories part, this AD’s text does not apply.

2. Obtain the referenced documents. Secure copies of Aeronautical Accessories Alert Service Bulletin 94045 (for 206A and 206B) or ASB 94046 (for 206L), and obtain Aeronautical Accessories Report AA-94022 Revision A (for 206A/206B) or Report AA-94023 (for 206L). The AD makes these documents the procedural standard for compliance (Requirement).

3. Schedule and carry out Requirement 1 within the specified windows. For 206A and 206B, perform the inspect-and-modify action in accordance with ASB 94045 before two months or 100 hours time in service after 2 March 1995, whichever occurs later. For 206L series, perform the ASB 94046 actions before two months or 100 hours time in service after 27 April 1995, whichever occurs later (Compliance). Because the AD references specific calendar anchors and flight-hour triggers, compute both metrics and schedule the work to meet the later of the two deadlines.

4. Upon completing Requirement 1, institute the recurring inspection programme required by Requirement 2. Perform the first post-modification inspection in accordance with Aeronautical Accessories Report AA-94022 Revision A (for 206A/206B) or Report AA-94023 (for 206L) within 300 hours time in service from the completion of Requirement 1. Thereafter, repeat inspections at intervals not to exceed 300 hours time in service or one year, whichever occurs first (Compliance). Track flight hours and calendar dates to ensure the sooner of the two triggers is observed.

5. Ensure the correct document revision is followed. Report AA-94022 is specifically cited as Revision A in the AD text; use that revision unless and until a regulatory amendment changes the AD. For the ASBs and Report AA-94023, use the versions referenced in the AD.

6. Allocate resources and downtime. The AD requires inspection and modification work and recurring inspections. Plan for maintenance facility scheduling, technician availability, parts procurement if the ASBs call for replacement items or modification hardware, and aircraft downtime. The AD does not provide technical or logistical details, those are in the ASBs and Reports.

7. Maintain records of the work. While the AD does not prescribe recordkeeping in its text, practical compliance and airworthiness oversight will require documentation of the inspection and modification actions and dates, as well as the serial number that establishes applicability. Retain copies of the ASBs and Reports used for the work, and record the dates and hours at which Requirement 1 and Requirement 2 inspections were completed. This recordkeeping is necessary to demonstrate that the AD’s timing windows and recurring inspection intervals have been observed, even though the AD does not specify the form of proof.

8. Review the ASB appendices for part identification details. The Note makes the ASB appendices the normative identification tool. Do not rely on alternative marking schemes without confirmation that they satisfy the identification requirement in the ASB appendices.

9. Check for further regulatory communications. The AD is an amendment effective 27 April 1995. If additional amendments, alternative compliance methods, or supervisory guidance are issued later by the regulator or the manufacturer, follow those as they become legally applicable. The AD itself does not address subsequent amendments beyond Amdt 1.

10. Seek clarifications through regulatory channels if necessary. The AD text does not state whether alternative methods of compliance or deviations are permitted. If an operator believes an equivalent inspection or modification method exists, or if there is ambiguity as to applicability or compliance, raise the matter with the relevant regulatory authority or through the operator’s regulatory compliance mechanisms to obtain an authoritative determination, as the AD does not itself provide a process for such determinations.

Following these steps will align maintenance action with the explicit requirements of AD/BELL 206/130 Amdt 1 as set out in the instrument.