AD/GA8/5 Amdt 4 - Horizontal Stabiliser Inspection

The AD rests on a small set of interconnected concepts and drafting choices. First, the AD is prescriptive by reference: rather than setting out the technical steps in the text of the AD, it makes compliance contingent on completing the contents of a specified manufacturer service bulletin (Requirement). The AD thus operates as a legal instruction to follow a separate technical document; it does not attempt to replicate diagrams, photographs or detailed procedures (Background).

Second, applicability is serial‑number and variant specific. The AD states the affected fleet boundaries in a clear cut manner: all GA8 aircraft with serial numbers GA8‑00‑004 and above, and all GA8‑TC 320 variant aircraft irrespective of serial number (Applicability). This means the AD is not framed by model year or configuration alone but by serial number blocks and a named variant.

Third, the AD uses an applicability matrix (Table 1 in the service bulletin) to determine which of the service bulletin’s Instructions 1 to 5 apply to which aircraft. The AD’s instruction is to "Accomplish the requirements (Instructions 1 to 5) in accordance with the applicability matrix in Table 1 of the service bulletin" (Requirement). Thus compliance is not a single uniform action for all affected aircraft; it is a menu of inspections/actions whose applicability varies by aircraft configuration/serial number as set out in the manufacturer’s table.

Fourth, the AD is outcome‑triggered by a specific structural safety concern. The Background identifies the structural locations of concern , the horizontal stabiliser rear spar splice plate, inboard main ribs around the rear pivot attachment, and attach bolts , and attributes detected cracking and possible attach‑bolt failures to either fatigue or "improper assembly" (Background). The AD therefore focuses on detection and rectification of cracking and inspection/rectification of bolt assembly.

Fifth, the AD’s drafting choice to refer rather than reproduce creates an operational dependency: the AD’s compliance content exists in the service bulletin (Requirement; Background). The AD explicitly notes that "Previous amendments of this AD listed the AD requirements in full. Due to the extensive use of diagrams and photographs, it is no longer appropriate or practical to write the requirements of the service bulletin out in full in this AD. All requirements, accomplishment instructions and illustrations are contained in the service bulletin" (Background). Practically, this means access to SB‑GA8‑2002‑02 Issue 6 is necessary to understand the precise inspection procedures, defect criteria, repeat intervals, and corrective actions.

Sixth, the AD records its amendment history and effective dates as part of the instrument’s lifecycle: original issue effective 15 February 2007; a previous amendment effective 13 April 2010; this Amendment 4 effective 19 May 2010 and signed 11 May 2010 (Background; Compliance). The AD indicates that the earlier amendments adjusted applicability and added inspection requirements for load‑transferring fittings.

Finally, the AD is an instrument from the Civil Aviation Safety Authority (CASA), signed by a CASA delegate (Mike Higgins), which situates the instruction within the civil aviation regulatory regime as presented in the document (signature block). The AD does not itself include provisions on enforcement or penalties, but it does constitute a directive by the regulator requiring specified inspections and actions via the referenced service bulletin.

The AD identifies the affected aircraft population precisely and thus the affected persons and organisations derive from ownership, operation and maintenance of those aircraft. The Applicability clause states "All GA8 aircraft serial numbers GA8‑00‑004 and above, and GA8‑TC 320 variant, all serial numbers" (Applicability). Therefore the immediately affected parties are:

• Owners of Gippsland Aeronautics GA8 aeroplanes with serial numbers GA8‑00‑004 and above. These owners are within the serial‑number band the AD expressly targets.
• Owners/operators of any GA8‑TC 320 variant aircraft, irrespective of serial number, since the AD lists that variant "all serial numbers" in the applicability field (Applicability).
• Maintenance organisations, licensed engineers and approved maintenance personnel who carry out inspections and repairs on the affected aircraft. The AD requires that the "requirements (Instructions 1 to 5)" in the manufacturer’s service bulletin be "accomplished" according to Table 1; those instructions will typically be executed by maintenance providers under existing maintenance approvals and airworthiness release processes (Requirement).
• Aircraft operators, including commercial and private operators, who must ensure their aircraft comply with airworthiness directives. The AD imposes a mandatory action; the entity responsible for maintaining the aircraft in an airworthy condition, commonly the operator or owner, must ensure the SB instructions are performed (Requirement; Applicability).
• Persons responsible for continuing airworthiness and maintenance records. Because the AD references a service bulletin rather than listing inspection criteria, accurate records of which Instructions 1-5 were applied to which aircraft under Table 1 will be necessary to demonstrate compliance.
• The Civil Aviation Safety Authority (CASA), represented here by the delegate who signed the AD, is the issuing authority and therefore party to administration and any follow‑up communications about the AD (signature block).

The AD also notes prior changes of scope: earlier amendments included the GA8‑TC 320 variant and Amendment 2 introduced inspections for horizontal stabilisers fitted with load‑transferring fittings (Background). That history implies that operators of aircraft with modifications or retrofits (for example, load‑transferring fittings) are specifically affected by the version‑specific inspection content in the service bulletin.

The AD does not state other categories such as suppliers, lessors, insurers, or third parties. It does not identify exemptions, alternative methods of compliance, or permissible deviations within the text provided. Therefore, for the purposes of this document, the affected parties are those who own, operate or maintain the listed aircraft types and variants and who must therefore obtain and follow the referenced manufacturer service bulletin (Applicability; Requirement; Background).

Duties

• Comply with the service bulletin: The core duty the AD imposes is to "Accomplish the requirements of Gippsland Aeronautics mandatory service bulletin SB‑GA8‑2002‑02, Issue 6, dated 21 April 2010" (Requirement). That language creates a mandatory obligation to follow the service bulletin in whole as it applies under the AD.
• Follow Instructions 1 to 5 per applicability matrix: The AD specifies that compliance requires accomplishing "Instructions 1 to 5 in accordance with the applicability matrix in Table 1 of the service bulletin" (Requirement). That means operators must consult Table 1 to identify which instructions apply to each affected aircraft and then carry out those instructions.
• Apply to specified aircraft: The duty to comply attaches to the aircraft identified in the Applicability clause: "All GA8 aircraft serial numbers GA8‑00‑004 and above, and GA8‑TC 320 variant, all serial numbers" (Applicability).
• Observe effective date: The AD "becomes effective on 19 May 2010" (Compliance). A duty to complete the required actions falls within the time frame and intervals set out in the service bulletin and the AD effective date context, so operators must act within the timelines established in the requirement document.

Rights and implied procedural considerations in the text

• Access to content through the service bulletin: The AD repeatedly directs readers to the manufacturer's service bulletin as the source of requirements and illustrations: "All requirements, accomplishment instructions and illustrations are contained in the service bulletin" (Background). Implicitly, affected parties have the right and the practical need to obtain SB‑GA8‑2002‑02 Issue 6 to know the technical details, including diagrams and photographs.
• Applicability clarity via Table 1: The AD adds an applicability matrix (Table 1 in the service bulletin) for clarity: the amendment "is issued to include an applicability matrix (Table 1, page 2) in the compliance section of the service bulletin for improved clarity" (Background). That amendment suggests that operators have a clearer mapping of which instructions apply to which serials/variants than earlier versions.
• No repetition of service bulletin content: The AD explicitly notes that it does not reproduce the SB instructions in full due to extensive diagrams and photographs (Background). That means affected parties cannot rely on the text of the AD alone to determine their technical obligations; they must consult the service bulletin.

What the AD does not state (and hence rights/duties not provided in the instrument)

• The AD does not specify an alternative method of compliance, nor does it include text granting exemptions in the instrument itself. The AD states the mandatory requirement as the service bulletin instructions and the applicability matrix, and it does not include provisions for deviation or substitution within the text provided (Requirement; Background).
• The AD does not set out the technical pass/fail criteria, inspection intervals, or specific corrective action thresholds; those are contained in the service bulletin per the AD (Requirement; Background).

Operational consequences of the duties

• Owners/operators and maintenance organisations must obtain SB‑GA8‑2002‑02 Issue 6 and apply Instructions 1-5 according to Table 1 for each affected aircraft (Requirement; Applicability).
• Maintenance planning must treat the AD as mandatory and schedule the inspections/repairs identified in the service bulletin within the time frames the service bulletin prescribes, noting the AD’s effective date (Compliance; Requirement).
• Recordkeeping will need to reflect which Instructions 1-5 were applied to which aircraft in line with Table 1 to show compliance with the AD as written (Applicability; Requirement).

All of the above duties and procedural implications are grounded in the AD text: the Requirement and Applicability clauses and the Background explanation that the SB contains the detailed instructions and that an applicability matrix has been added for clarity (Requirement; Applicability; Background).

The instrument as provided does not include explicit penalty clauses, monetary fines or enforcement mechanisms within its text. The AD lists the technical requirement, the applicability, and effective dates; it records the signature of Mike Higgins, Delegate of the Civil Aviation Safety Authority, and the dates of signature and effect (signature block; Compliance). The AD does not set out sanctions, civil or criminal penalties, suspension processes, or enforcement procedures in the text supplied.

What the AD does indicate

• Regulatory origin: The AD is issued under the authority of the Civil Aviation Safety Authority (CASA), as shown by the signature line: "Mike Higgins, Delegate of the Civil Aviation Safety Authority" dated 11 May 2010. That identifies the issuing authority but does not itself spell out enforcement steps (signature/date block).
• Mandatory nature: The AD uses mandatory language: "Accomplish the requirements" and refers to a "mandatory service bulletin" (Requirement). The use of mandatory language indicates this is an obligatory airworthiness directive rather than advisory guidance. The AD’s mandatory phrasing, coupled with its issuance by CASA, communicates a regulatory expectation of compliance even though the instrument itself does not elaborate enforcement mechanisms.

What the AD does not say

• The AD does not set out compliance deadlines beyond stating the AD's effective date ("This Amendment becomes effective on 19 May 2010") and does not include specified remedial periods, grace periods, or staged compliance intervals within the text presented (Compliance).
• The AD does not describe consequences for non‑compliance such as grounding aircraft, revoking certificates, imposing fines, or pursuing other administrative or criminal sanctions. None of those enforcement actions are mentioned in the available text.
• The AD does not provide a procedure for seeking relief, extension, or an alternative method of compliance within the instrument. It does not state whether deviations from the service bulletin are permissible subject to CASA approval.

Practical implications for operators and maintenance organisations

• Because this AD is framed as a mandatory directive and issued by CASA, affected parties should treat it as a binding regulatory instruction and act to accomplish the referenced service bulletin’s Instructions 1-5 in accordance with Table 1. Although the AD text does not list penalties, the mandatory character and regulatory source imply that compliance is expected.
• A prudent operator should therefore obtain SB‑GA8‑2002‑02 Issue 6, plan to accomplish the specified inspections/actions by the relevant dates, document the work performed, and be prepared to demonstrate compliance to the regulator or during audits. The AD itself emphasises reliance on the service bulletin for technical specifics and does not include enforcement language, so the documentation trail becomes the primary evidence base for having satisfied the AD.

Because the AD text does not state enforcement provisions or penalties, any formal enforcement steps applicable in practice would derive from the broader statutory powers and procedures of the issuing authority rather than from this AD’s text alone; those broader powers are not described in the AD as provided.

The AD as presented is a single regulatory instrument focused on a technical inspection requirement and its interaction with other laws or instruments is not explicitly set out in the text. The document identifies itself as an amendment to an existing AD and references earlier AD issues and amendments. The AD therefore exists within a chain of regulatory instruments addressing the same technical problem and refers operators to the manufacturer's service bulletin for technical content (Background; Requirement).

Interactions and linkages that the AD does make explicit

• Chain of ADs and service bulletin reliance: The Background states that the "original issue of this AD became effective on 15 February 2007" and notes a "previous amendment became effective 13 April 2010" (Background). This demonstrates that the AD operates as part of a series of amendments and is intended to be read in that context. The AD’s content interacts with earlier ADs by amending or clarifying applicability and by shifting from reproducing SB content to referencing the service bulletin directly because of diagrams and photographs (Background).
• Manufacturer service bulletin as operative technical content: The AD directs compliance to "Gippsland Aeronautics mandatory service bulletin SB‑GA8‑2002‑02, Issue 6, dated 21 April 2010" (Requirement). That creates a direct operational interaction between the regulator’s directive and the manufacturer's remedial technical documentation; the AD supplies the legal mandate while the service bulletin supplies the technical method.
• Variant and modification coverage: The Background and applicability note that an earlier amendment included a reference to the GA8‑TC 320 variant and that Amendment 2 introduced inspections for horizontal stabilisers with load‑transferring fittings installed (Background). This indicates that the AD’s scope has been adjusted to take account of variants and certain modifications, which implies an interaction with the technical status of the aircraft , e.g. the presence of load‑transferring fittings changes inspection requirements per the service bulletin.

What the AD does not address in the instrument text

• The AD does not expressly reference or modify any statutory provisions, regulations, airworthiness standards, certificate terms, or enforcement powers beyond naming the Civil Aviation Safety Authority delegate as signatory. The AD itself does not quote underlying legal enabling provisions, nor does it cross‑reference specific parts of aviation law, regulations or rules in the text provided.
• The AD does not specify how compliance with the service bulletin interacts with continuing airworthiness obligations, maintenance release procedures, or the terms of air operator or maintenance approvals in legislative detail. It presumes the reader understands that airworthiness directives and mandatory service bulletins are components of the continuing airworthiness framework, but the AD does not elaborate those relationships.
• The AD does not mention interactions with contractual arrangements such as leases, warranties, insurance, or liability allocation among owners, operators and maintenance providers. Those commercial interactions are outside the instrument’s text.

Operationally sensible interactions to note (grounded in the AD text)

• Because the AD requires compliance with a specified service bulletin, operators will need to reconcile the SB requirements with their own maintenance schedules, airworthiness records and regulatory reporting systems to show compliance. The AD’s reliance on the SB (Requirement; Background) means that the service bulletin becomes a de facto part of the aircraft’s continuing airworthiness instructions for affected aircraft until superseded or rescinded.
• The AD’s amendment history (Background) suggests that operators must track AD amendments and the version of the service bulletin referenced: this amendment cites Issue 6 dated 21 April 2010. The interaction therefore depends on which version of the SB is mandated by the AD text at any given time.

Because the AD as provided does not enumerate legal cross‑references beyond the issuing authority and prior ADs, any further interaction with other laws, regulations or contractual obligations must be ascertained from the broader regulatory framework and contract documents, which are not contained within this AD text.

The AD explicitly records a brief history of prior issuances and the reasons for amendments, providing a timeline and the subject matter changes that prompted each iteration. The Background section contains the amendment history information and the reasons for the current amendment.

Key dates and changes recorded in the AD text

• Original issue: The AD states "The original issue of this AD became effective on 15 February 2007" (Background). That is the inception point of this directive’s lifecycle as recorded in the instrument.
• Amendment chronology: The AD notes that "The previous amendment became effective 13 April 2010" and that "This Amendment becomes effective on 19 May 2010" (Background; Compliance). The signature line is dated 11 May 2010 (signature block), which is between the signature date and the effective date.
• Amendment content: The Background explains the reasons and content of the previous amendments and the present amendment. It records that earlier amendments "included reference to the GA8‑TC 320 variant in the applicability section" and that "Amendment 2 was issued because the requirement document now contains an inspection for cracking in horizontal stabilisers which have load transferring fittings installed" (Background). This shows the AD’s scope was broadened to include a particular variant (GA8‑TC 320) and to ensure aircraft with a certain modification (load‑transferring fittings) receive specific inspection content.
• Reason for current drafting choice: The Background also explains a drafting choice for the current amendment: "Previous amendments of this AD listed the AD requirements in full. Due to the extensive use of diagrams and photographs, it is no longer appropriate or practical to write the requirements of the service bulletin out in full in this AD. All requirements, accomplishment instructions and illustrations are contained in the service bulletin" (Background). That statement justifies why the AD refers to the manufacturer’s service bulletin rather than reproducing it.

Implications of the recorded history

• The recorded issuance dates indicate that this AD has been live, in some form, since 15 February 2007 and has undergone at least two subsequent amendments (including Amendment 2 and the previous amendment effective 13 April 2010) to incorporate new findings and variant/fitment coverage (Background). The AD’s present form is Amendment 4 effective 19 May 2010.
• The text shows iterative regulatory attention in response to new data: an inspection of a "high time aircraft" revealed structural cracking and attach‑bolt issues, prompting the AD and subsequent amendments (Background). That iterative history signals that the AD’s technical content has been updated as new issues were discovered and as the manufacturer’s service bulletin evolved.

Administrative signatory

• The AD bears the signature of a CASA delegate, Mike Higgins, dated 11 May 2010 (signature block). The signature identifies the regulatory officer responsible for the instrument at the time of issue.

What the AD does not record

• The AD provides no further administrative record such as amendment numbers beyond the label "Amdt 4", no later superseding amendments (beyond the previous amendment dated 13 April 2010), nor any retraction or rescission language in the text supplied. It does not include a consolidated history table beyond the few dates and reasons stated in the Background.

In sum, the AD’s amendment history as recorded in the available text shows a progression from a 2007 original issue through at least two amendments to the version effective 19 May 2010, with the present amendment adding or clarifying an applicability matrix and explaining why the service bulletin content is now referenced rather than reproduced.

The document as supplied contains no litigation history. It does not name, cite or summarise any court decisions, administrative law determinations, appeals, or disputes arising from this AD. The Background discusses inspections and technical findings that prompted the AD and describes earlier amendments and their technical content, but it does not reference any legal challenges, enforcement actions, or judicial review related to the AD itself (Background).

What is contained in the instrument regarding dispute or review processes

• The AD does not provide details about appeal, administrative review processes, or dispute resolution mechanisms in its text. It does not state whether affected parties may seek an alternative method of compliance, obtain an exemption, or request extension of compliance times, nor does it indicate the procedural route for seeking such relief. The instrument focuses on the technical requirement to accomplish the service bulletin instructions and the applicability matrix (Requirement; Applicability).

Practical consequence for researchers and practitioners

• Because the AD lacks any litigation history or references to legal proceedings within the text, any inquiry into whether the AD has been subject to litigation, review, or challenge would require searching external legal and regulatory records beyond the content of this instrument. The AD itself presents only the regulatory mandate and the technical background for its issuance.

Therefore, the AD as provided contains no entries or notes that would constitute a litigation history; it records dates, amendments, and the technical rationale but not legal actions or disputes.

This AD contains several practical traps and operational dependencies that can catch practitioners who rely only on the text of the AD rather than the referenced service bulletin or the aircraft maintenance records. Because the AD delegates the technical specifics to the manufacturer's service bulletin, the main "gotchas" arise from that delegation and the particular wording of the Applicability and Requirement clauses.

1. The AD does not contain the inspection procedures, criteria or intervals. The instrument explicitly states that all instructions and illustrations are in SB‑GA8‑2002‑02 Issue 6 and that previous ADs listed requirements in full but this amendment does not for reasons of diagrammatic content. The AD therefore does not stand alone as a compliance manual (Background; Requirement). Failure to obtain the specified service bulletin means you do not have the technical content necessary to comply.

2. Applicability is serial‑number and variant specific. The AD applies to "All GA8 aircraft serial numbers GA8‑00‑004 and above, and GA8‑TC 320 variant, all serial numbers" (Applicability). A common practical error is to assume the AD applies only to particular model designations or production years; instead it uses serial‑number thresholds and variant identification. Operators must match each aircraft’s serial number and variant status against the AD’s applicability criteria.

3. Table 1 is decisive. The AD instructs compliance "in accordance with the applicability matrix in Table 1 of the service bulletin" (Requirement). Table 1 determines which of Instructions 1-5 apply to each aircraft. If an operator misreads or does not consult Table 1, they may either omit required inspections or perform unnecessary ones.

4. The AD identifies retrofits/modifications as material to inspection scope. Amendment 2 added inspections for horizontal stabilisers "which have load transferring fittings installed" (Background). That means that modification status (presence of load‑transferring fittings) changes inspection obligations. Operators must know the modification history of their airframe to identify which Instructions apply.

5. Effective date vs signature date. The AD is signed on 11 May 2010 but "becomes effective on 19 May 2010" (signature block; Compliance). Practitioners should not assume that the AD takes immediate effect on signature; they must treat the effective date as the operational trigger for compliance timing.

6. Problem locations and causes require judgment. The Background identifies cracking locations and observes that some "failure of some attach bolts in service may be due to improper assembly" (Background). Determining whether a bolt failure is attributable to improper assembly versus service fatigue may require technical judgement and possibly input from the aircraft manufacturer or approved engineering authority; the AD does not provide criteria for distinguishing cause or detailing corrective measures , that is left to the service bulletin.

7. The AD references a "mandatory service bulletin." If an operator relies on alternative instructions from other sources (other SB issues, repair organisations or independent engineers) without explicit authorisation, they may not have complied with the AD as written; the AD mandates SB‑GA8‑2002‑02 Issue 6 specifically (Requirement). Using a different version of the service bulletin or an alternative method without clear regulatory approval may leave an operator non‑compliant.

8. Recordkeeping and proof of compliance. The AD requires that the requirements be "accomplished" but does not specify the form of evidence or documentation. Because the AD relies on an external service bulletin that contains diagrams and photos, it is essential to keep maintenance records that show which instructions were completed, by whom, on what date, and with what findings and corrective actions. The AD itself does not tell you what paperwork will satisfy the regulator.

9. Misplaced reliance on earlier AD texts. Earlier amendments listed the AD requirements in full. This amendment intentionally stops reproducing those requirements and instead refers to the manufacturer’s bulletin (Background). Relying on an old printed copy of an earlier AD that contained the full text, without consulting the current service bulletin or the present AD amendment, risks missing updated applicability or inspection content.

10. Absence of enforcement detail in the AD text. The instrument does not specify penalties or enforcement procedures (Penalties and enforcement). Practitioners should therefore not assume any particular enforcement route or schedule from the AD itself; rather they should treat the AD as a mandatory technical directive that must be demonstrably complied with.

In short, the main operational "gotchas" are: failure to obtain and follow SB‑GA8‑2002‑02 Issue 6; mis‑applying the serial‑number or variant applicability; ignoring modification status (load‑transferring fittings); not documenting completed Instructions 1-5 per Table 1; and assuming the AD contains technical details that it intentionally omits.

Compliance with AD/GA8/5 Amendment 4 requires a sequence of discrete, document‑based and maintenance actions grounded in the text of the AD. The AD makes compliance contingent on satisfying the instructions contained in Gippsland Aeronautics mandatory service bulletin SB‑GA8‑2002‑02, Issue 6, dated 21 April 2010, and on applying Instructions 1-5 per the applicability matrix in Table 1 (Requirement; Applicability). The following steps set out, in order, what an operator or maintenance organisation must do to comply with the AD as written.

1. Verify applicability for each aircraft

   • Check the aircraft serial number and variant status. The AD applies to "All GA8 aircraft serial numbers GA8‑00‑004 and above, and GA8‑TC 320 variant, all serial numbers" (Applicability). For each GA8 on your register, confirm whether the serial number is GA8‑00‑004 or above, or whether the aircraft is a GA8‑TC 320 variant.
   • Check for modifications such as the installation of load‑transferring fittings, because Amendment 2 introduced inspections for horizontal stabilisers fitted with those items (Background).

2. Obtain the exact service bulletin specified by the AD

   • Obtain Gippsland Aeronautics mandatory service bulletin SB‑GA8‑2002‑02, Issue 6, dated 21 April 2010. The AD states that "All requirements, accomplishment instructions and illustrations are contained in the service bulletin" and that Instructions 1-5 and Table 1 determine the required actions (Background; Requirement). Without this document you cannot know the SB’s inspection procedures, pass/fail criteria, or corrective actions.

3. Consult Table 1 (applicability matrix) and identify which Instructions apply

   • The AD requires accomplishing "Instructions 1 to 5 in accordance with the applicability matrix in Table 1 of the service bulletin" (Requirement). Use Table 1 to determine which of the Instructions 1-5 are applicable to your specific aircraft configuration, serial number and any relevant modifications.

4. Plan and schedule the inspections and any corrective actions

   • Follow the inspection intervals, access instructions, defect acceptance criteria and corrective actions specified in Instructions 1-5 of SB‑GA8‑2002‑02 Issue 6. The AD does not list intervals or procedures; they are in the service bulletin (Requirement; Background).
   • Coordinate with your approved maintenance organisation or licensed engineer to book the inspections. Ensure personnel performing the work are authorised to carry out the required tasks and issue an appropriate maintenance release.

5. Execute inspections and corrective work precisely as instructed in the SB

   • Inspect the horizontal stabiliser rear spar splice plate, inboard main ribs around the area of the horizontal stabiliser rear pivot attachment, and attach bolts per the SB instructions, because the Background identifies these locations as the problem areas (Background).
   • If the SB requires bolt torque checks, removal and replacement, eddy current or dye‑penetrant inspections, or structural repairs, carry these out exactly as directed in the SB, including use of specified part numbers, fasteners, or repair spares.

6. Document the work and findings

   • Record the completion of whichever Instructions 1-5 applied to the aircraft in the aircraft’s maintenance records. The AD requires accomplishing the SB requirements but does not specify the evidence format; standard maintenance documentation should record the SB issue used, the instructions followed, the findings, any parts replaced, the date of work, and the person and organisation performing the work (Requirement; Background).
   • If the SB prescribes repeat intervals, record future inspection due dates in the aircraft’s maintenance program.

7. Address any non‑conforming findings per the SB

   • Where cracking or defective fasteners are found, follow the SB’s corrective action guidance. If the SB leaves ambiguous any repair action or requires a design approval, seek the manufacturer’s advice or an approved engineering authority as required by standard maintenance and continuing‑airworthiness procedures.

8. Keep the SB and AD records together for inspection and audit

   • Because the AD refers to SB‑GA8‑2002‑02 Issue 6 specifically, retain a copy of that SB and a record that the work was undertaken in accordance with that issue. The AD replaced prior full-text AD content with a reference to the SB because of diagrams and photographs, so retaining the SB is essential to demonstrate compliance (Background).

9. Monitor for further ADs or SB revisions

   • The AD has an amendment history: original issue 15 February 2007, previous amendment effective 13 April 2010, this amendment effective 19 May 2010 (Background; Compliance). Operators should track whether CASA issues further amendments or whether the manufacturer issues a later SB revision that might be mandated by a future AD.

10. If uncertain, seek clarification from CASA or the manufacturer

    • The AD does not specify alternative methods of compliance or exemptions in its text. If an operator believes there is a legitimate alternative method of compliance or needs to request an extension, the appropriate administrative route would need to be pursued; the AD itself does not describe that route. In practice, contact with the manufacturer and the regulator will be required for any non‑standard approach.

By following these steps , verify applicability, obtain and follow SB‑GA8‑2002‑02 Issue 6, implement Instructions 1-5 per Table 1, document the work, and monitor for additional regulatory guidance , operators can satisfy the AD’s mandate as written. All of the foregoing is grounded in the AD’s Requirement, Applicability and Background statements that tie legal obligation to the manufacturer’s service bulletin and specify the affected serial numbers and variant.