The AD operates around several key concepts that define its scope and obligations. First, “wing bolts, washers, nuts and fittings” are the specific hardware components subject to inspection and replacement. The AD distinguishes between the wing attach bolt itself and the surrounding recess, fittings and drain holes. “Corrosion or loss of inhibitor” is the trigger condition that elevates the inspection requirement from a simple visual check (Requirement 1) to the more invasive removal and inspection (Requirement 2). The AD uses the concept of “time in service” (TIS) measured in hours and years to define compliance intervals. For Requirement 2, the compliance period is expressed as “100 hours’ time in service or 12 months from the commencement date of this AD, whichever occurs first.” This dual metric reflects the different usage patterns of private and commercial aircraft. The AD introduces the critical distinction between “private operations” and “all other operational categories.” Private operations receive longer intervals: 10 years for initial inspection and reinspection, compared to 5 years for other categories. This distinction likely reflects a risk assessment that private operations involve lower utilisation and therefore less fatigue accumulation, though the AD does not state this rationale explicitly. The concept of “initial installation of the wing bolts” is defined expansively: Note 4 and Note 5 state that installation includes removal for inspection purposes and reinstallation. This means that every time a bolt is removed and reinstalled, the clock resets for the next inspection interval. This has significant practical implications: a private operator who removes and reinstalls bolts at year 9 resets the 10-year clock to zero, potentially delaying the next required removal. The AD also introduces the concept of “on condition” maintenance as an alternative to retirement under Requirement 3. This allows bolts that have reached 20 years TIS to remain in service if they meet the criteria in Table 201 of the maintenance manual, rather than being automatically retired. This is a notable shift from the previous requirement, which mandated retirement at 20 years with no alternative (as described in the background to Amendment 5). The AD also incorporates the concept of “mandatory reporting” with a distinct obligation for both nil findings and confirmed defects. This is a significant compliance burden because it requires active reporting even when nothing is wrong, not just when defects are found. Finally, the AD uses the concept of “rendering unserviceable” retired hardware, meaning that wing bolts, washers and nuts removed under Requirement 3 must be permanently disabled or destroyed to prevent re-use.

The AD directly affects every entity that owns, operates or maintains any Textron Aviation (Beechcraft) 35 series aeroplane, all models and all serial numbers. This includes individual private aircraft owners, flying schools, charter operators, corporate flight departments, maintenance organisations and any person who conducts scheduled or unscheduled maintenance on these aircraft. The compliance obligations fall primarily on the registered operator or the person responsible for the continuing airworthiness of the aircraft, as they are typically the ones who must ensure the AD is complied with before flight. However, the AD also affects maintenance engineers and approved maintenance organisations (AMOs) who carry out the inspection, removal and replacement tasks, because they must perform the work in accordance with the specific maintenance manual revision referenced by the AD and must certify that the work has been completed correctly. The AD also affects persons who sell or import these aircraft, because the AD creates a mandatory obligation that must be disclosed and satisfied before an aircraft can be operated in Australian territory. The distinction between private and other operational categories means that the AD treats operators differently based on the aircraft’s operational category as recorded on the Australian aircraft register. An aircraft that is used for private pleasure flying gets longer intervals (10 years) than an aircraft used for commercial charter, aerial work or flight training (5 years). This creates an incentive for operators to consider whether their usage pattern genuinely qualifies as private operations and to maintain accurate records of flight hours and operational category. The AD also affects insurers, lessors and financiers who have an interest in the aircraft, because non-compliance with an airworthiness directive can void insurance coverage, affect residual value and create liability exposures. Parts suppliers are indirectly affected because the AD mandates replacement of wing bolts, washers and nuts with new hardware at certain intervals, creating a predictable demand for these parts. The type certificate holder, Textron Aviation, is also affected because the AD relies on its maintenance manual as the source of the approved inspection and replacement procedures; any future changes by Textron to that manual could trigger further amendments to the AD. Finally, CASA is affected as the regulator that must process defect reports, monitor compliance and take enforcement action if necessary. The AD does not apply to aircraft operated under foreign registrations outside Australian jurisdiction, but it would apply to any such aircraft if operated in Australian airspace under an Australian certificate of airworthiness or equivalent.

The AD creates a web of duties for aircraft operators and maintainers, with very few corresponding rights. The primary duty is to perform Requirement 1 (annual corrosion inspection) every 12 calendar months, with a duty to proceed immediately to Requirement 2 if visible corrosion is found. That second duty is phrased as “must be accomplished before further flight,” meaning the aircraft is grounded until the removal and inspection is completed. The duty to perform Requirement 2 removal and inspection arises at the specified intervals: for private operations, within 100 hours TIS or 12 months from commencement, whichever comes first, and not later than 10 years from initial installation; for other categories, within 100 hours TIS or 12 months from commencement, and not later than 5 years from initial installation. Importantly, these intervals are not independent - the duty is to inspect before the earlier of the two time limits expires. The duty to replace wing bolts, washers and nuts at 20 years TIS (or maintain on condition per Table 201) is also mandatory. The AD imposes a duty to replace nuts whenever bolts are removed for inspection, even if the bolts themselves are being reinstalled (Note 6). This is an additional cost that may surprise operators who assume the existing nuts can be reused. The duty to report through CASA’s Defect Reporting Service applies to both nil findings and confirmed defects arising from Requirement 2 inspections. This means the operator must submit a report even if the inspection finds nothing wrong. The reporting duty is ongoing and must be completed in the manner specified (online portal or Form 404). The AD also imposes a duty to render retired hardware unserviceable, preventing the sale or re-use of removed components. The only explicit right under the AD is the alternative means of compliance for Requirement 3: bolts may be maintained on condition rather than replaced at 20 years. This is a right, but it is conditional on meeting the criteria in Table 201 of the maintenance manual. The AD does not grant any right to apply for an extension of compliance time, nor does it provide for alternative means of compliance without further regulatory action. However, the broader regulatory framework (CASR Part 39) may allow CASA to approve alternative means of compliance, though that is not mentioned in the AD itself. The AD also implicitly grants a right to rely on the maintenance manual revision specified (Revision D2 May 29, 2024) as the approved method for performing the work. Operators and maintainers have a duty to use that specific revision and not earlier or later revisions unless CASA has approved a change. The AD provides no right to compensation for the costs of compliance, no right to challenge the technical basis of the directive through a merits review process within the instrument itself, and no grandfathering or transition period beyond the compliance dates specified.

The AD itself does not prescribe specific penalty amounts, but it is made under the Civil Aviation Safety Regulations, which provide a comprehensive enforcement framework. Operating an aircraft that does not comply with an applicable airworthiness directive is a breach of the Civil Aviation Safety Regulations 1998, specifically regulation 42.100 which requires that an aircraft must not be operated unless it conforms to its approved design and is in a condition for safe operation. Non-compliance with an AD is a safety offence that can attract civil penalty proceedings brought by CASA in the Federal Court, with penalties of up to 1,000 penalty units for an individual (currently $313,000) and 5,000 penalty units for a body corporate (currently $1,565,000). Additionally, CASA can issue infringement notices (on-the-spot fines) for less serious breaches. The AD creates mandatory reporting obligations, and failure to report as required is itself a separate offence. CASA can also suspend or cancel the airworthiness certificate of an aircraft that is not maintained in accordance with ADs, effectively grounding the aircraft until compliance is demonstrated. For maintenance organisations, failure to properly perform the tasks required by the AD or to correctly certify the work can lead to suspension or revocation of their approval, with significant business consequences. The AD’s enforcement teeth are strengthened by the mandatory reporting requirement: operators must submit defect reports to CASA, which gives the regulator visibility into compliance without needing to conduct on-site inspections. CASA can cross-reference defect reports with maintenance records and operational data to identify patterns of non-compliance. The AD also uses the concept of “before further flight” as an immediate grounding condition if corrosion is found at the Requirement 1 inspection. This means that even if the operator is otherwise compliant with the AD, discovering corrosion creates a duty to stop flying until the more invasive inspection is completed. An operator who continues to fly after such a finding without complying with Requirement 2 would be in clear breach and could face immediate enforcement action including suspension of the aircraft’s airworthiness certificate. The AD does not provide for any administrative appeals process within the instrument itself; any challenge to CASA’s enforcement action would need to be made through the Administrative Appeals Tribunal or the Federal Court, depending on the nature of the decision. The practical effect is that the AD creates strong compliance incentives through the combination of mandatory reporting, short compliance periods, grounding triggers and the risk of significant financial penalties. For a private owner, the cost of non-compliance (penalty plus litigation costs plus grounding and potential loss of aircraft value) far outweighs the cost of performing the inspections on schedule. The AD effectively removes any discretion from the operator about whether to comply: the duty is absolute, with no grace period or leniency for inadvertent non-compliance.

This AD does not operate in a vacuum; it sits within a hierarchy of aviation safety legislation. The AD is issued under subregulation 42.065(1) of the Civil Aviation Safety Regulations 1998 (CASR), which empowers CASA to issue airworthiness directives that are mandatory for the continued airworthiness of aircraft. The AD must be read in conjunction with the Civil Aviation Act 1988, which establishes the legal framework for aviation safety and gives CASA its enforcement powers. The AD’s interpretation and enforcement will also be informed by Part 39 of CASR, which governs airworthiness directives generally, including requirements for notification, compliance and record keeping. The AD specifically references the Beechcraft Maintenance Manual 36-590001-9D Revision D2 May 29, 2024, Chapter 57, as the source of the approved procedures for removal, inspection and replacement. This means the maintenance manual becomes incorporated by reference into the AD, and any changes to the manual that are approved by CASA (via a change to the Instructions for Continued Airworthiness) could trigger a further amendment to the AD, as happened with Amendments 5 and 6. The AD also interacts with the broader system of scheduled maintenance: a 100-hour inspection required by the AD may coincide with an existing 100-hourly, annual or other periodic inspection required under CASR Part 42 or Part 91, and the AD does not prohibit combining the tasks, but the AD requirements must be accomplished in full regardless of other maintenance. The AD’s mandatory reporting requirement interacts with CASA’s defect reporting system established under regulation 42.030 of CASR, which requires reporting of certain defects and malfunctions. By requiring reporting of both nil findings and confirmed defects for Requirement 2, the AD expands the default reporting obligations. The AD also interacts with state and territory laws concerning aircraft maintenance and safety, but those are generally excluded to the extent of any inconsistency with Commonwealth aviation law. There is no interaction with work health and safety laws mentioned in the AD, but a maintenance engineer performing the work would need to comply with relevant workplace safety requirements for the hangar environment. The AD does not alter any contractual rights between the aircraft owner and a maintenance provider, but failure to comply with the AD could constitute a breach of the contract or a breach of the engineer’s duty of care. The AD may also interact with international obligations, as Australia is a signatory to the Chicago Convention and adopts standards and recommended practices from the International Civil Aviation Organization (ICAO). Airworthiness directives issued by CASA are recognised by other ICAO member states for aircraft on the Australian register. An operator who exports the aircraft overseas must disclose the AD and show compliance, otherwise the importing state may require additional maintenance before issuing a foreign airworthiness certificate. The AD does not reference any other ADs, but there are separate ADs for other components of the Bonanza series, such as AD/BEECH 33/41 for the wing centre section, which was mentioned in the background to Amendment 3. An operator must comply with all applicable ADs, not just this one. The AD also interacts with insurance policies: most aviation insurance policies require the insured to comply with ADs as a condition of coverage, and non-compliance can void the policy, leaving the operator personally liable for damage or injury.

The AD has a detailed amendment history set out in the background section. It was initially issued and became effective on 1 February 1996, making mandatory the inspection and replacement periods for wing attachment hardware as detailed in a requirement document (which appears to be earlier versions of the Beechcraft Bonanza Shop Manual or maintenance manual). Amendment 1 added Note 1 to Requirement 2, which clarifies the inspection methodology and explicitly added “fittings” as an item to be inspected when wing bolts, washers and nuts are removed. This expanded the scope of the inspection from just hardware to include the surrounding structural fittings. Amendment 2 removed an alternative means of compliance that had previously allowed in situ inspection of wing attachment bolts and nuts without removal. This was a significant tightening because it forced operators to actually remove the bolts for a proper inspection, rather than relying on visual checks through inspection covers. Amendment 3 extended the compliance time for Requirement 1 by two months. The background notes this was done while a proposed airworthiness directive process was conducted for a related AD (AD/BEECH 33/41 Amdt 4). This suggests coordination between two ADs covering different but possibly overlapping structural areas of the same aircraft type. Amendment 4 introduced the distinction between private and other operations for the first time. It allowed aircraft used in private operations to conduct a visual inspection of exposed areas of wing attach bolts and wing fitting recess at a 10-year interval, in lieu of following the manufacturer’s maintenance instructions (which presumably required removal at shorter intervals). For all other operations, the inspection requirements remained unchanged at 5 years. This created a bifurcated compliance regime that persists in Amendment 6. Amendment 5 followed a change to the Instructions for Continued Airworthiness by the type certificate holder, which increased the life limit of wing bolts to 20 years and required only a removal and visual inspection at the five-year interval. This aligned the AD with the manufacturer’s updated recommendations. Amendment 6, the current version, follows a further amendment of the Beechcraft Maintenance Manual 36-590001-9D which introduced an option: after the 20 year time in service life, wing attach bolts may be maintained on condition rather than automatically replaced. This is the key change from Amendment 5. The AD also changed the reference document from the older Beechcraft Bonanza Shop Manual 35-590096 Revision B22 to the newer Beechcraft Maintenance Manual 36-590001-9D Revision D2, though the older manual is still referenced in Requirement 2 for aircraft that have already accomplished the inspection under that manual. The amendment history reveals a pattern: initial tightening (removing in situ inspection), followed by targeted relaxation for private operations, then alignment with manufacturer updates, and finally the introduction of the on condition option. This suggests CASA has been responding to both safety data and industry feedback over nearly 30 years.

The AD source does not record any litigation directly challenging this specific directive, its amendments, or any enforcement action taken under it. There are no court cases, tribunal decisions, or other judicial proceedings mentioned in the text. This is not surprising for two reasons. First, airworthiness directives are technical regulatory instruments that are typically complied with by the aviation industry without legal challenge, because the costs of compliance are small relative to the costs of grounding or losing an aircraft due to non-compliance, and because the safety rationale is usually clear. Second, even if an operator disagreed with the technical basis of the AD, the avenues for judicial review are limited: an operator would need to show that CASA acted beyond its power, that the decision was procedurally unfair, or that it was otherwise legally flawed, which is a high bar given the broad discretion CASA has under the Civil Aviation Act to issue ADs in the interests of safety. That said, the amendment history does hint at pushback or evolving knowledge. Amendment 2 removed an alternative means of compliance that had allowed in situ inspection, which may have been challenged by operators who preferred the less invasive method. Amendment 4’s introduction of a 10-year interval for private operations could be seen as a concession to private owners who argued that the 5-year interval was excessively burdensome for low utilisation aircraft. More broadly, there is no record of litigation under the general CASR framework that specifically addresses this AD. The absence of litigation does not mean there have been no disputes; it may mean that any disagreements were resolved informally by CASA through negotiation or by issuing a further amendment (as happened with Amendment 3 extending the compliance time). It is also possible that enforcement actions were taken but not publicly recorded in a way that would appear in standard legal databases, or that matters were settled before reaching a court. For the practising lawyer, the lack of litigation history means there is no judicial guidance on how the AD should be interpreted, particularly around phrases such as “initial installation of the wing bolts” or “aircraft operating only in private operations.” This uncertainty could be exploited in a dispute, but it also means that an operator taking an aggressive interpretation does so without the comfort of precedent. Any future enforcement action by CASA would be a matter of first impression, and the court would likely give considerable deference to CASA’s interpretation based on the AD’s history and purpose. Overall, the litigation history is a blank slate, which is typical for highly specific technical directives of this kind.

Several aspects of the AD could trap unwary operators and maintainers. The first is the definition of “installation of the wing bolts” in Notes 4 and 5. The AD says installation includes removal for inspection purposes and reinstallation. This means that every time a bolt is removed and put back, the clock for the next inspection interval resets. A private operator who removes and reinstalls bolts at year 9 of a 10-year cycle actually starts a new 10-year countdown, potentially delaying the next removal to year 19 from original installation. This may be unintuitive; an operator might assume the original installation date is the reference point, but the AD makes it dynamic. The second gotcha is Note 6: “Always replace wing attach nuts with new items when removing the wing attach bolts for inspection.” This applies every time, regardless of whether the bolts are being replaced or reused. An operator who removes bolts for inspection and then reinstalls the same bolts must still buy new nuts. This is a recurring cost that is easy to overlook in budgeting. The third gotcha is the mandatory reporting of both nil findings and confirmed defects for Requirement 2. Many operators may assume they only report when something is wrong. The AD explicitly requires reporting of “both NIL findings of defects and confirmed defects.” Failing to submit a nil report is itself a breach of the AD, even if the inspection was performed correctly. The fourth gotcha is the use of the 100 hours TIS or 12 months whichever occurs first as the trigger for Requirement 2 at commencement. If the AD commences on 13 July 2025, an aircraft that has not been inspected within the prior 12 months will need to be inspected immediately, regardless of the 10-year or 5-year intervals. This could catch operators who were following the previous 10-year cycle and thought they had more time. The fifth gotcha is the interaction between Requirement 1 and Requirement 2. Requirement 1 is an annual visual check of the recess, not the bolts themselves. However, if any corrosion is found on the visible portion of the bolt or nuts, washers, or fittings, Requirement 2 must be done before further flight. This means a simple annual inspection can trigger a much more invasive and costly removal inspection immediately. The sixth gotcha is the requirement to “render unserviceable all hardware retired” under Requirement 3. An operator cannot simply discard used bolts; they must be permanently disabled (e.g., cut, drilled, or deformed) and documented. This prevents later re-use or sale, which might otherwise be tempting given the cost of new hardware. The seventh gotcha is the reference to the specific revision of the maintenance manual: Revision D2 May 29, 2024. If a maintainer uses an earlier revision (e.g., an older paper copy in the hangar) the work may not be considered compliant with the AD, even if the procedures are substantially similar. The eighth gotcha is that the AD applies to all serial numbers, even though the type certificate holder’s manual may not explicitly cover all serial numbers (as noted in the AD text). CASA has made a policy decision to extend applicability beyond the manual, which could be challenged but is binding until overturned. The ninth gotcha is that the on condition alternative under Requirement 3 is available only “as per the above aircraft maintenance manual” and “IAW Table 201.” An operator who wants to use this alternative must have access to that exact table and follow its criteria precisely. Simply deciding the bolt looks good is not enough; there must be documented compliance with the on condition program. The tenth gotcha is the compliance date: 13 July 2025. This is not a long lead time. For aircraft that may be due for a 5-year or 10-year inspection soon after that date, the operator must plan and budget for the work immediately, especially since specialist parts and labour may need to be sourced.

Compliance with AD/BEECH 35/67 Amdt 6 requires a systematic approach that integrates the AD’s requirements into the aircraft’s continuing airworthiness management system. The first step is to determine the aircraft’s operational category: is it used only in private operations, or does it fall into any other category such as charter, aerial work, training or corporate? This distinction matters for the Requirement 2 inspection intervals. The operator should document the operational category in the aircraft’s logbooks or maintenance records. Next, the operator must establish a compliance schedule. Requirement 1 (annual corrosion inspection of recess and drain holes) is straightforward: schedule it to recur every 12 calendar months from the date of last compliance. If the aircraft has not had this inspection within the last 12 months, it should be done immediately upon commencement of the AD on 13 July 2025. For Requirement 2 (removal and inspection of wing bolts, washers, nuts and fittings), the operator must determine the installation date of the wing bolts. This is not simply the date the aircraft was built; it is the date of initial installation of the current set of wing bolts, including any reinstallation after a previous inspection. The compliance clock for the first inspection under the AD is the earlier of: 100 hours TIS from commencement, or 12 months from commencement, or the applicable calendar limit since installation (10 years for private, 5 years for other). The operator should calculate all three and comply with the earliest. For subsequent inspections, the interval is either 10 years or 5 years from the date of the most recent removal and reinstallation (remembering that reinstallation resets the clock). For Requirement 3 (retirement of bolts at 20 years TIS), the operator must know the total time in service from first installation of zero time wing bolts. If the aircraft has not yet reached 20 years TIS, the operator must plan for retirement before that threshold. Alternatively, the operator may choose to adopt the on condition maintenance program per Table 201 of the maintenance manual Revision D2. This decision should be documented, and the criteria in Table 201 must be followed for each inspection cycle. The operator must also ensure that every time wing bolts are removed for inspection (whether for Requirement 2 or for any other reason), new wing attach nuts are installed (Note 6). The old nuts must be discarded. All retired hardware must be rendered unserviceable (cut, drilled or otherwise permanently disabled) and documented in the aircraft’s maintenance records. The mandatory reporting obligation must be integrated into the maintenance workflow. Before or after completion of a Requirement 2 inspection, the responsible person (typically the maintainer or operator) must submit a defect report to CASA’s Defect Reporting Service. The report must be submitted regardless of outcome: nil findings require a report, and confirmed defects also require a report. The operator should use the online portal or Form 404 as specified. The maintenance records must include a reference to the AD, the specific revision of the manual used (Revision D2 May 29, 2024), the date of compliance, the findings and the report submission details. A practical tip is to create a laminated checklist that technicians can use in the hangar, incorporating all three requirements, the nuts replacement rule, and the reporting step. The operator should also maintain a separate AD compliance log that tracks each requirement with due dates, actual dates, and hours TIS. Given the intervals of up to 10 years, it is easy to lose track; a calendar reminder system is essential. For operators with multiple Bonanza aircraft, a centralised spreadsheet or maintenance software database is advisable. Finally, the operator should verify that their maintenance provider is authorised to perform the work and has access to the correct revision of the Beechcraft Maintenance Manual. Using an outdated manual or an unapproved procedure could render the inspection non compliant, even if the technician did everything correctly in substance. The cost of compliance includes labour, replacement nuts, possible replacement bolts and washers, and the administrative effort of reporting. The on condition alternative may reduce long term costs for high utilisation aircraft but requires rigorous documentation. For private owners, the 10-year interval for Requirement 2 may mean the inspection is only required twice over a 20 year ownership period, making the AD relatively low burden compared to commercial operations. However, the 12 month Requirement 1 inspection cannot be skipped and must be folded into the annual inspection cycle.