AD/JABIRU/3 Aileron Control Tube

The AD is structured around a small set of interlocking concepts: applicability, mandatory inspection, reference to a manufacturer service bulletin, reporting to CASA, corrective action, and compliance timing.

• Applicability. The AD specifies the models covered: “Type certificated Avtech (Jabiru Aircraft) models UL‑C, UL‑D, J160‑C, LSA 55/2K, LSA 55/2J, Jabiru ST, LSA 55/3J and Jabiru ST3 - all serial numbers” (Applicability). The AD explicitly notes that some Jabiru models are light sport aircraft and not subject to the AD, and that the AD therefore limits applicability to type‑certificated models (Requirement Note 1). This establishes the population of aircraft to which the AD applies.

• Mandatory inspection referenced to a Service Bulletin. The central duty is to “Inspect the aileron control tube in accordance with the requirements of Jabiru Service Bulletin (JSB) JSB 042‑1, as in force from time to time” (Requirement 1). The AD does not set out inspection steps itself; it mandates compliance with the manufacturer’s JSB and its current version.

• Reporting to CASA. The AD requires that “Report the results of the inspection to CASA via the Defect Report System” (Requirement 2). The AD therefore creates a bilateral flow of information from operators/maintainers to the regulator.

• Corrective action per the Service Bulletin. If cracking is found, the AD prescribes corrective action “in accordance with JSB 042‑1” (Requirement 3). The AD ties both inspection and remedy to the manufacturer’s documented procedure.

• Temporal and recurrence requirements. The AD sets compliance timing and recurrence parameters in the “Compliance” block. It states a phrase “No later than 4,000 hours’ total time in service” followed by enumerated sub‑items including “Before further flight after the commencement date of this Airworthiness Directive, and thereafter, At each 100 hourly or Annual Inspection whichever occurs first” and additional numbered lines that appear to map testing, reporting and corrective steps to timing (Compliance). The AD also includes “This Airworthiness Directive becomes effective on 21 March 2021.” Operators must reconcile the listed timings with their aircraft’s total time in service and scheduled inspections.

• Binding reference to the latest Service Bulletin. The AD includes the note: “The words ‘as in force from time to time’ require compliance with the most recent version of the referenced document” (Requirement Note 2). This means the operative inspection and corrective procedures are those in the latest published version of JSB 042‑1 at the time of compliance.

• Safety rationale. The Background section explains why the AD was issued: a fracture failure of the aileron control tube in a Jabiru 160C occurred during landing roll; examination showed a quadrant had been cracked through for some time; and a complete failure may cause loss of primary lateral and pitch controls (Background). That causal sequence is the safety trigger for the inspection and correction requirements.

• Distinction with Manufacturer’s Safety Direction. The AD communicates that for certain Jabiru models that are light sport aircraft the regulatory instrument is a Manufacturer’s Safety Direction rather than an AD; the AD thus carves out those models from its applicability and points to an alternate regulatory mechanism (Requirement Note 1).

These concepts set up an inspection‑and‑report regulatory cycle in which the operational actors (owners/operators/maintainers) must execute manufacturer procedures, report outcomes to CASA, and remediate defects identified by the prescribed method.

The AD directly affects the owners, operators, and maintenance personnel responsible for the listed type‑certificated Jabiru models. The Applicability clause identifies the specific models: “Type certificated Avtech (Jabiru Aircraft) models UL‑C, UL‑D, J160‑C, LSA 55/2K, LSA 55/2J, Jabiru ST, LSA 55/3J and Jabiru ST3 - all serial numbers” (Applicability). By limiting applicability to type‑certificated models and excluding certain light sport aircraft (Requirement Note 1), the AD delineates that owners/operators of type‑certificated Jabiru aeroplanes are within scope, while some light sport owners are not.

Who pays. The AD itself does not state who bears the cost, but the obligations it imposes indicate the following allocation of practical costs: the party responsible for aircraft maintenance and airworthiness , typically the owner/operator or their contracted maintenance organisation , must carry out the inspections and, where cracking is found, arrange and pay for corrective actions in accordance with JSB 042‑1 (Requirement 1 and 3). The AD also requires reporting inspection results to CASA via the Defect Report System (Requirement 2), which imposes an administrative time cost on the reporter. The AD text does not specify funding or compensation mechanisms.

Who decides. The AD is issued by CASA and signed by the named delegate, David Charles Punshon (10 February 2021 signature block). The AD binds operators to follow JSB 042‑1 “as in force from time to time” (Requirement Note 2), so decisions about specific inspection procedures and corrective measures are made in the first instance by the manufacturer in the JSB, and CASA enforces compliance with the JSB by referencing it in the AD. Operators must therefore follow both the manufacturer’s technical specification and the regulator’s AD.

Who performs the work. The AD requires an inspection “in accordance with the requirements of Jabiru Service Bulletin (JSB) JSB 042‑1” (Requirement 1). That will typically be performed by a person authorised to carry out maintenance on the aircraft under applicable maintenance rules and standards. The AD does not itself specify qualification requirements for inspectors or maintenance personnel; it defers to the JSB for technical content and to the broader regulatory regime for who is authorised to perform maintenance.

Other affected parties. Organisations that maintain records of defects and airworthiness (maintenance organisations, Continuing Airworthiness Management Organisations, and insurance underwriters) will be affected by the reporting requirement and the change to recurring inspection practice implied by the Compliance section. Manufacturers and distributors of aileron control tubes may also be affected to the extent the JSB prescribes replacement parts or repair processes.

Excluded or differently regulated parties. Owners/operators of Jabiru light sport models that are not type‑certificated are not included in the AD’s scope; the AD notes they are “subject to a Manufacturer’s Safety Direction” instead (Requirement Note 1). Those owners must therefore look to the manufacturer’s Safety Direction rather than this AD for their regulatory obligations.

In short, the AD imposes operational, technical and reporting obligations on the type‑certificated Jabiru aeroplane owner/operators and their maintenance personnel, while leaving light sport models to a separate manufacturer direction.

The AD codifies a small set of duties and indicates a limited set of rights by implication through its references.

Duties (expressed in the AD)

• Inspect the aileron control tube according to JSB 042‑1: The primary duty is to “Inspect the aileron control tube in accordance with the requirements of Jabiru Service Bulletin (JSB) JSB 042‑1, as in force from time to time” (Requirement 1). This is a procedural duty that requires the inspector to apply the most recent JSB content (Requirement Note 2).

• Report inspection results to CASA: The AD mandates “Report the results of the inspection to CASA via the Defect Report System” (Requirement 2). This is a specific administrative duty requiring use of CASA’s Defect Report System.

• Take corrective action when cracking is found: On discovery of cracking the AD requires “corrective action must be taken in accordance with JSB 042‑1” (Requirement 3). The AD directs remedial measures to the method set out by the manufacturer’s bulletin.

Duties (timing and recurrence)

• The Compliance section sets temporal obligations. It includes the phrase “No later than 4,000 hours’ total time in service:” followed by enumerated sub‑clauses including “Before further flight after the commencement date of this Airworthiness Directive, and thereafter, At each 100 hourly or Annual Inspection whichever occurs first” and further lines. Those lines assign a sequence of inspection and post‑inspection actions tied to aircraft hours and scheduled inspections (Compliance). The AD also states it becomes effective on 21 March 2021, giving a regulatory commencement date (Compliance).

Rights (implicit or limited)

• Right to rely on JSB procedures: By referencing JSB 042‑1 “as in force from time to time” (Requirement Note 2), the AD allows operators to follow the manufacturer’s detailed technical instructions. That means operators exercise the right to fulfil the AD’s obligations by complying with the JSB’s procedures as published.

• Right to report via the Defect Report System: The AD specifies the mechanism for reporting, “via the Defect Report System” (Requirement 2). Operators therefore have a defined channel for satisfying the reporting duty.

• No express exemption mechanism in the AD text: The AD does not set out any procedure for seeking relief or exemption from the inspection, reporting, or corrective obligations. The AD does not describe a process for variance, alternative methods of compliance, or application for relief; it simply mandates compliance per the JSB and reporting to CASA (Requirement 1-3). If an operator seeks to rely on an alternative method, the AD text supplies no route within its own words; the operator would need to consult the broader regulatory framework outside the AD.

Boundaries and interplay of duties

• The AD instructs compliance with the latest JSB revision (Requirement Note 2), which both fixes the standard to an external document and requires ongoing attention to that document’s revisions. The duty to report to CASA (Requirement 2) runs alongside the technical duties and creates an information flow the regulator can use to monitor compliance and defect prevalence.

• The AD distinguishes type‑certificated models from light sport models and identifies a separate regulatory vehicle for the latter (Requirement Note 1). The AD therefore splits duties across regulatory instruments depending on the aircraft category.

In short, the AD imposes clear inspection, reporting and corrective duties on operators of the listed type‑certificated Jabiru models and delegates technical specifics to the manufacturer’s service bulletin. The AD does not itself include an internal process for exemptions or alternative compliance.

The AD itself does not state penalties or enforcement measures within the text provided. The instrument contains mandated obligations , inspection per JSB 042‑1, reporting to CASA, and corrective action on finding cracking (Requirement 1-3) , but the text does not include penalty provisions, sanctions, or explicit enforcement processes. The AD’s authorising signature and effective date are provided: “This Airworthiness Directive becomes effective on 21 March 2021” and it is signed by David Charles Punshon, Delegate of the Civil Aviation Safety Authority (10 February 2021 signature block). Beyond those administrative details, the AD does not describe inspection enforcement mechanisms, penalties, or remedial powers in its own text.

What the AD does include that bears on enforcement

• Reporting obligation to CASA: By requiring operators to “Report the results of the inspection to CASA via the Defect Report System” (Requirement 2), the AD creates a data stream to the regulator. That reporting requirement gives CASA visibility over compliance and the prevalence of the defect; it is a potential enabler of regulatory follow‑up or audit, although the AD does not specify follow‑up steps.

• Effective date and delegations: The AD identifies an effective date (21 March 2021) and contains a delegate’s signature. The presence of an effective date sets a clear compliance start point for enforcement; the signature indicates the decision was made by an authorised CASA delegate (signature block). The AD text itself does not specify consequences for non‑compliance.

What the AD does not say (and therefore what operators should note)

• No penalties specified: There are no express civil or administrative penalties, no criminal provisions, and no specified sanctioning procedures set out in the AD text you have provided. The AD also does not specify how CASA will verify compliance, conduct inspections, or impose remedial directions where an operator fails to comply. The AD likewise does not set out a mechanism for CASA to accept alternative means of compliance.

• No appeal or variance procedure in the AD text: The AD does not describe a process for seeking relief, waivers, or alternative corrective measures within the AD itself.

Practical inference for operators (limited to what the AD shows)

• Because the AD sets mandatory duties and provides a reporting channel to CASA (Requirement 1-3), operators should expect that non‑reporting or failure to carry out the inspection and corrective steps would at least be visible to CASA. The AD text gives no further detail on how CASA may act in response.

• Operators relying on the AD should consult the wider statutory and regulatory framework (not included in the AD text) and CASA guidance for enforcement protocols, sanctions, civil penalties, and avenues for variance or alternative means of compliance. The AD does not itself set those out.

In short, the AD imposes obligations and a reporting duty, but the provided text contains no explicit penalty or enforcement schedule. Enforcement implications therefore depend on CASA’s broader regulatory powers and practice outside the AD text.

The AD text itself references and interacts with a manufacturer’s Service Bulletin and mentions an alternative regulatory mechanism for certain aircraft categories. Beyond that, the AD text provides limited direct cross‑references to other statutes or regulations, so the following interaction points are those explicitly shown or reasonably implied within the AD.

Interaction with manufacturer documentation

• Mandatory reference to JSB 042‑1: The AD requires inspections and corrective action “in accordance with the requirements of Jabiru Service Bulletin (JSB) JSB 042‑1, as in force from time to time” (Requirement 1 and 3; Requirement Note 2). This makes the AD operationally dependent on the content of the JSB and its subsequent revisions. The AD therefore interacts procedurally with the manufacturer’s technical materials; the AD elevates the JSB from a manufacturer recommendation to a regulator‑mandated standard for the listed models.

Interaction with CASA reporting systems

• Reporting via the Defect Report System: The AD obliges operators to “Report the results of the inspection to CASA via the Defect Report System” (Requirement 2). This links the AD to CASA’s administrative processes and systems for defect reporting. The AD interacts with CASA’s internal regulatory processes by creating a required input into that system.

Interaction with the regulatory distinction between type certification and light sport classification

• Carve‑out to Manufacturer’s Safety Direction for LSA models: The AD states that “Some of these models are light sport aircraft and are not subject to this Airworthiness Directive but are subject to a Manufacturer’s Safety Direction. Consequently, only type certificated models are included in the applicability section of this AD” (Requirement Note 1). This allocates regulatory coverage between an Airworthiness Directive, which applies to type‑certificated aircraft, and a Manufacturer’s Safety Direction, which is used for light sport models. The AD therefore interacts with the regulatory scheme that differentiates aircraft regulation by certification category.

Implicit interaction with broader airworthiness/maintenance law (not specified in text)

• The AD mandates inspections and repairs in accordance with the JSB but does not itself set out qualification requirements for maintenance providers, record keeping rules, or acceptance procedures for completed work. Those matters fall within the broader CASA airworthiness and maintenance regulatory framework. The AD text does not describe those interactions, but in practice operators will need to align the AD’s duties with applicable maintenance licensing, airworthiness release, and recordkeeping obligations in the wider regulatory regime.

Reference to the latest version of documents

• The AD’s note that the words “as in force from time to time” require compliance with the most recent version of the referenced document (Requirement Note 2) means that the AD automatically migrates to incorporate later versions of the JSB. That creates an interaction between the AD and any subsequent revisions of JSB 042‑1 issued by the manufacturer; an operator’s compliance obligations will track changes to the JSB.

No express statutory cross‑references in the AD text

• The AD does not cite other Acts, Civil Aviation Regulations, or penalty provisions in its own wording. It therefore does not itself delineate how non‑compliance interfaces with particular statutory enforcement mechanisms. Operators must therefore consult the broader body of aviation law and CASA guidance to understand how this AD fits into wider statutory obligations and sanctions.

In summary, the AD directly incorporates and binds the manufacturer’s JSB, ties reporting to CASA’s Defect Report System, and delineates applicability according to aircraft certification category, thus interacting operationally with manufacturer documents and CASA’s administrative processes. The AD text does not, however, include explicit cross‑references to statutory enforcement provisions or detailed maintenance‑licensing rules; those interactions are left to the broader regulatory framework outside the AD.

The AD text provided contains only the issuance and effective details, and it references a prior manufacturer Service Bulletin release; it does not contain an explicit amendment history for the AD itself. The AD states that it “becomes effective on 21 March 2021” (Compliance) and is signed by David Charles Punshon, Delegate of CASA, with a signature date of 10 February 2021 (signature block). There is no record in the supplied text of prior versions of this AD, nor of subsequent amendments, revocations or superseding ADs.

Relationship to the manufacturer’s Service Bulletin timeline

• The AD references Jabiru Service Bulletin JSB 042‑1 and notes that the Service Bulletin “was released on 16 May 2019” (Background). The AD therefore post‑dates the manufacturer’s JSB. The AD explicitly requires compliance with JSB 042‑1 “as in force from time to time” so the AD is designed to pick up future revisions of the JSB without the AD text itself being amended (Requirement Note 2).

Absence of AD revision log in supplied text

• The provided AD text does not contain a revision table, version number for the AD, previous AD numbers affecting the same models, or transitional amendment provisions. The only AD numbering present is the AD identifier printed at top: “AD/JABIRU/3” (header). The AD includes the same identifier repeated several times in the document (page headers), but no amendment chronology for AD/JABIRU/3 itself is present.

Implication for operators and maintainers

• Because the AD directs compliance to the current version of JSB 042‑1 (Requirement Note 2), technical amendments to inspection or repair steps are likely to be implemented by the manufacturer via JSB revisions rather than by amendment of the AD text itself. Operators should therefore track the manufacture’s JSB history (starting from the JSB’s release on 16 May 2019) and monitor CASA communications for any AD amendments. However, the AD text supplied does not itself record any AD modifications.

If an official amendment history is required

• The AD text supplied does not provide it. To obtain a formal amendment trail, operators must consult CASA’s official register of ADs, any published amendment notices, or CASA’s website and databases which typically list current ADs and their revision history. The AD text itself contains no such entries.

In short, the supplied text contains only the initial issuance details and a reference to the JSB release date; it does not contain a standalone amendment history for the AD.

The AD text provided does not reference any litigation, court decisions, or administrative appeals related to this AD, the JSB, or the underlying safety matter. There are no cases mentioned in the document, and there is no record within the supplied text of any legal challenges, appeals, or determinations concerning the AD’s validity, scope, or enforcement. The document’s Background section discusses the technical failure that prompted the AD , a fracture failure of an aileron control tube on a Jabiru 160C during landing roll , and explains the safety consequence, but it does not catalogue any litigation arising from that event (Background).

Implications for users seeking litigation information

• The AD itself provides no litigation history; operators or counsel looking for decisions or legal precedent that interpret or challenge this AD will need to consult external judicial and administrative records. The AD gives the AD identifier (AD/JABIRU/3), effective date (21 March 2021), and the signature/delegate, which are useful search parameters for locating any potential litigation or appeals in CASA’s administrative records or in court dockets. The supplied text contains none of those materials.

• Because this AD references a manufacturer Service Bulletin (JSB 042‑1) and a discovery of a fractured part, any litigation or claims arising from the incident (such as product liability or negligence claims) would arise outside the AD text. None of that is included here.

In short, the supplied AD contains no litigation history and cites no judicial or administrative decisions.

This AD contains a few textual and structural features that can cause confusion or compliance risk if not attended to. The AD text should be read carefully and operators should pay attention to the interplay of the AD and the referenced JSB.

1. Dual labelling of inspection frequency (header “Biweekly”) versus Compliance text. At the top of the supplied text the AD is labelled “Biweekly” twice in the header area and table (AD/JABIRU/3 , Aileron Control Tube , Biweekly). The AD’s Compliance section, however, specifies a different recurrence pattern, including “Before further flight after the commencement date … and thereafter, At each 100 hourly or Annual Inspection whichever occurs first” and a reference to “No later than 4,000 hours’ total time in service” (Compliance). These two different frequency indicators (header “Biweekly” and Compliance detailed schedule) are both present in the supplied text. The presence of “Biweekly” in the header could be a formatting artefact or administrative label, but operators should not assume the header supersedes the Compliance text. The AD’s explicit Compliance section provides the operative timing requirements for inspection and recurrence (Compliance). Treat the Compliance section as the substantive timing obligation in the AD.

2. “As in force from time to time” makes the JSB version variable. The AD states that inspections and corrective action must be done “in accordance with the requirements of Jabiru Service Bulletin (JSB) JSB 042‑1, as in force from time to time” and further notes “The words ‘as in force from time to time’ require compliance with the most recent version of the referenced document” (Requirement 1; Requirement Note 2). That wording means the procedural standard can change without amendment of the AD itself; operators must maintain awareness of JSB revisions and ensure inspections and remedial steps follow the latest JSB text.

3. Applicability excludes some light sport models from the AD but not from other obligations. The AD’s Note 1 says some Jabiru models are light sport aircraft and are not subject to this Airworthiness Directive but are subject to a Manufacturer’s Safety Direction. Consequently, only type certificated models are included in the AD’s applicability section (Requirement Note 1). Operators of LSA models should therefore consult the manufacturer for a Safety Direction and not assume the AD applies to their aircraft merely because the model name appears in manufacturer materials. The AD covers the listed type‑certificated models only.

4. Compliance timing language is compact and potentially ambiguous. The Compliance paragraph contains multiple numbered and bulleted elements: “No later than 4,000 hours’ total time in service:1. a. Before further flight after the commencement date of this Airworthiness Directive, and thereafter, b. At each 100 hourly or Annual Inspection whichever occurs first. 2. Each time the inspection is performed. 3 Before any further flight.” The way these lines are written in the supplied text could be interpreted as linking different steps (inspect prior to flight, do recurring inspections at 100‑hour or annual intervals, report each time, and perform corrective action before further flight). Operators should parse the AD carefully and, where uncertain, consult CASA or the JSB for clarification.

5. Reporting channel is specific; do not substitute. The AD requires reporting “to CASA via the Defect Report System” (Requirement 2). Using an alternative reporting channel may not satisfy the AD. Operators must use the specified Defect Report System to meet the reporting obligation.

6. The AD does not set out an exemption or alternative compliance process. The AD does not describe procedures for seeking an alternative method of compliance or relief in its own text. If an operator intends to rely on a non‑JSB repair method or wants to argue a different inspection interval, the AD provides no pathway in its text; the operator must consult CASA’s broader regulatory processes outside the AD.

7. The AD ties safety outcomes to flight control loss. The Background explicitly notes that “A complete failure of an aileron torque tube may result in loss of the pilot’s primary lateral and pitch controls” (Background). That stated safety consequence underlines the criticality of compliance and the need for immediate corrective action if cracking is found.

8. No penalty text within the AD. The AD does not specify enforcement or penalty mechanisms within the document; however, the presence of mandatory duties and a reporting requirement means failure to comply will be visible to CASA. Operators should not assume absence of penalties in the AD text implies absence of enforcement consequences under other regulatory instruments.

Taken together, these points mean operators need to: (a) follow the Compliance section rather than any other label; (b) track JSB revisions and apply the latest version; (c) report via CASA’s Defect Report System; and (d) be prepared to remediate defects before further flight as required by the AD and JSB.

This section sets out practical steps, drawn from the AD text, that an operator or maintainer should follow to meet the AD’s requirements. Each step cites the relevant AD provision so the operative obligations are clear.

1. Confirm applicability to your aircraft (Applicability; Requirement Note 1)

   • Check your aircraft’s model and certification. The AD applies to “Type certificated Avtech (Jabiru Aircraft) models UL‑C, UL‑D, J160‑C, LSA 55/2K, LSA 55/2J, Jabiru ST, LSA 55/3J and Jabiru ST3 - all serial numbers” (Applicability).
   • If your aircraft is a light sport model not type‑certificated, the AD states those models are “not subject to this Airworthiness Directive but are subject to a Manufacturer’s Safety Direction” (Requirement Note 1). In that case, consult the manufacturer’s Safety Direction.

2. Obtain the current JSB 042‑1 and the AD text (Requirement 1; Requirement Note 2; Background)

   • Acquire the latest Jabiru Service Bulletin JSB 042‑1, noting the AD requires compliance with “JSB 042‑1, as in force from time to time” (Requirement 1 and Note 2).
   • Confirm the JSB release date and any subsequent revisions (the AD notes the JSB was released on 16 May 2019) (Background). Ensure you have the most recent revision before performing the inspection.

3. Schedule the inspection per the AD’s Compliance timing (Compliance)

   • The AD’s Compliance section states “No later than 4,000 hours’ total time in service” and further instructs inspections “Before further flight after the commencement date of this Airworthiness Directive, and thereafter, At each 100 hourly or Annual Inspection whichever occurs first” (Compliance).
   • Practical interpretation: ensure that you perform the first inspection before the next flight after the AD’s commencement date if your aircraft is within the stated service time limit, and thereafter include the inspection at each scheduled 100‑hour or annual inspection interval, whichever comes first. If any uncertainty remains about timing relative to your aircraft’s hours, consult CASA or the JSB to confirm the correct scheduling.

4. Perform the inspection exactly as directed in JSB 042‑1 (Requirement 1)

   • The AD requires the inspection to be performed “in accordance with the requirements of Jabiru Service Bulletin (JSB) JSB 042‑1” (Requirement 1). Do not substitute a different inspection method unless you have an authorised alternative accepted by CASA under applicable regulatory processes.
   • JSB 042‑1 (as referenced in the AD’s Background) requires inspection of the aileron control torque tube where it connects to the control stick pivot plate for cracking at each of four quadrants; ensure that the inspection covers the four quadrant checks as described in the JSB (Background). Use appropriately qualified maintenance personnel to perform the inspection.

5. Report inspection results to CASA via the Defect Report System (Requirement 2)

   • After each inspection, file a report of the inspection results to CASA using the Defect Report System, as mandated by the AD (Requirement 2). Do not rely on informal communications , use the specified system to meet the AD’s reporting duty.

6. If cracking is found, take corrective action per JSB 042‑1 before further flight (Requirement 3; Compliance)

   • The AD states that “If any cracking is found to the aileron control tube during the inspection, corrective action must be taken in accordance with JSB 042‑1” and elsewhere requires action “Before any further flight” (Requirement 3; Compliance).
   • Ensure corrective work follows the JSB’s specified repair or replacement steps exactly, and that any parts used are compliant with the JSB’s parts specification.

7. Maintain records of inspections, reports and corrective actions

   • While the AD does not itself specify a recordkeeping format, the reporting requirement to CASA and the inspection schedule imply that operators should keep contemporaneous maintenance records documenting inspection dates, findings, JSB version used, corrective actions taken, and the Defect Report System submission references. That will assist in demonstrating compliance if CASA queries the operator.

8. Monitor JSB 042‑1 revisions and CASA communications (Requirement Note 2)

   • The AD requires compliance with JSB 042‑1 “as in force from time to time” and clarifies that that phrase “require[s] compliance with the most recent version of the referenced document” (Requirement Note 2). Regularly check for new versions of JSB 042‑1 and for any subsequent ADs, amendments, or CASA guidance that affect the inspection regime.

9. If there is any ambiguity or need for an alternative means of compliance, consult CASA

   • The AD text does not provide an internal process for exemptions or alternative compliance routes. If an operator intends to use a different inspection method or variation in timing, they should contact CASA to determine the appropriate regulatory process for agreement or approval, because the AD itself is silent on variance procedures.

10. Safety priority: take immediate action when cracking suggests a pre‑existing failure (Background; Requirement 3)

• The Background indicates that an aircraft had a quadrant cracked through for some time before complete failure occurred and that total failure “may result in loss of the pilot’s primary lateral and pitch controls” (Background). Where inspection reveals cracking that suggests imminent failure, treat the condition as flight‑critical and effect corrective action in accordance with the JSB before further flight.

Following these steps aligns operator practice with the AD text: perform the JSB‑specified inspection on the listed type‑certificated Jabiru models, report every inspection result to CASA via the Defect Report System, and if cracking is found, perform JSB‑specified corrective work before further flight, while ensuring inspectors use the most recent JSB revision (Requirement 1-3; Requirement Note 2; Compliance).