AD/DO 328/20 - Circuit Breaker Panels 10VE & 11VE Sealing

The AD is structured around a small set of interlocking concepts that determine applicability and required actions: Applicability, Requirements (inspection, sealing, replacement), Reference to Manufacturer Accomplishment Instructions, Compliance deadlines and the reason for action (moisture/condensation damage). Each concept is set out in the AD text and operates as the legal trigger for action.

Applicability: The AD is limited to Model 328-100 aeroplanes equipped with either circuit breaker Panel 10VE (serial numbers up to and including 131) or Panel 11VE (serial numbers up to and including 133) (Applicability). This precise serial-number limitation narrows the class of aircraft affected. The AD therefore does not apply to other models or to later-serial-number panels beyond the stated ranges.

Inspection requirement: The AD mandates a visual inspection of the specified panels for evidence of damage or burning, and it directs that the inspection be performed "in accordance with the Accomplishment Instructions of Dornier Service Bulletins SB-328-31-016, dated 2 April 1997" (Requirement 1). The AD thus delegates execution details,tools, tolerances and exact procedures,to the referenced service bulletin rather than embedding them in the AD text.

Corrective measures: Two distinct corrective pathways are established. If no damage is found, the AD requires the installation of additional sealing at the contact points of the panel back-lighting wires (Requirement 1.b). If damage or burning is found, the AD requires replacement of the panel plus the additional sealing (Requirement 2). The AD explicitly links replacement and sealing to the service bulletin’s Accomplishment Instructions.

Timing: The AD prescribes a strict time window: Requirement 1 must be completed within 30 days after the AD’s effective date; Requirement 2 must be completed before further flight after the inspection if damage is found (Compliance). These timings convert the AD into an instrument with immediate operational impact: failed panels must be rectified prior to next flight.

Reference and cross-reference: The AD identifies the precise service bulletin to be used (SB-328-31-016, 2 April 1997) and includes a note that "LBA AD 97-136 refers" (Note). The AD therefore integrates manufacturer-prescribed methods and a prior foreign airworthiness directive reference into its compliance regime.

Safety rationale: The AD states as background that the directive addresses damaged panels caused by accumulation of moisture and condensation, and that the required work is the inspection, installation of sealing and replacement if necessary (Background). The statement focuses on moisture/condensation as the causal mechanism and sealing plus replacement as the mitigations.

Delegation and issuance: The AD is issued by the Civil Aviation Safety Authority through its delegate, James Coyne, and dated 29 November 2005 (signature block). The AD’s effective date is later, 19 January 2006 (Compliance), creating a defined period in which operators must implement the inspection and mitigation steps.

Taken together, these concepts define a narrow but operationally immediate regulatory obligation: affected operators must follow a manufacturer’s service procedure to inspect and either seal or replace panels within short timeframes, with the explicit safety goal of preventing damage from moisture and condensation.

The AD affects operators and owners of Dornier Model 328-100 aeroplanes that have circuit breaker panel 10VE or panel 11VE installed, where those panels fall within the serial-number ranges specified: panel 10VE serial numbers up to and including 131; panel 11VE serial numbers up to and including 133 (Applicability). The applicability language confines the instrument to aircraft with those specific panels installed and to panels with serial numbers inclusive of the upper bounds stated. Aircraft without the specified panels, or with panels having serial numbers above those limits, are not within the stated applicability in this AD.

Stakeholders who will be obliged to act include maintenance organisations contracted by the aircraft operator, certifying staff who must carry out or sign off the Accomplishment Instructions of Dornier Service Bulletin SB-328-31-016 (2 April 1997), and the operator’s flight operations team responsible for ensuring aircraft are airworthy and compliant with directives before dispatch. Because Requirement 2 conditions return-to-service on the replacement of damaged panels "before further flight after the Requirement 1.a. inspection," flight crews and dispatch personnel are also implicated in ensuring aircraft with damaged panels are not flown until rectified.

The document does not list third parties such as parts suppliers, insurers or lessors, but these parties are indirectly affected through the operator’s obligations. For example, a lessor may need to verify the lessee’s compliance with applicable directives; a parts supplier may face demand for replacement panels and sealing materials; and insurers may be interested in rectification timing and records. The AD text itself does not impose direct obligations on suppliers or lessors, it imposes mandatory maintenance actions on the operator/owner of the affected aeroplane.

Geographical scope: The AD is an instrument of the Civil Aviation Safety Authority and thereby applies within its jurisdiction. The AD also references LBA AD 97-136, indicating that the issue has been addressed elsewhere, but the immediate regulatory effect in the text attaches to aircraft under the issuing authority’s purview.

Temporal scope: The AD became effective on 19 January 2006 and prescribes that the inspection required by Requirement 1 be completed within 30 days of that effective date; if damage is found, replacement must be done before further flight (Compliance). Those time constraints impose immediate practical effects on operators during that compliance window.

Personnel and resources: Compliance requires appropriately qualified maintenance personnel capable of following the Dornier Service Bulletin Accomplishment Instructions. Operators who cannot access those resources within the 30-day window will face short-notice logistical and scheduling demands. If replacement is required under Requirement 2, parts availability and maintenance facility scheduling become material constraints.

The AD’s narrow applicability means the affected population is specific and identifiable. The operator, maintenance provider and certifying staff bear the statutory duties created by the AD; other commercial parties are second-order stakeholders who may experience changes in demand or administrative obligations as a consequence of the primary compliance actions specified.

Duties

• Perform the inspection specified: Operators must carry out a visual inspection of circuit breaker panels 10VE and 11VE for damage or signs of burning, following the Accomplishment Instructions of Dornier Service Bulletins SB-328-31-016 dated 2 April 1997 (Requirement 1.a). The AD makes the service bulletin the operative method by reference rather than repeating technical steps.

• Install additional sealing where no damage is found: If the inspection required by Requirement 1.a finds no damage or burning, operators must install additional sealing at the contact points of the panel back-lighting wires, again in accordance with the service bulletin (Requirement 1.b).

• Replace panel and install sealing where damage is found: If the inspection finds damage or evidence of burning the AD requires the replacement of the panel and installation of additional sealing at the contact points of the panel back lighting wires, in accordance with the service bulletin (Requirement 2). The AD conditions return to service on completion of this corrective action ("before further flight") (Compliance).

• Meet the deadlines prescribed: Requirement 1 must be completed within 30 days after the AD’s effective date; Requirement 2 must be completed before further flight after the inspection if damage is found (Compliance). Those deadlines are mandatory components of the AD.

• Use specified service material: All actions are to be carried out "in accordance with the Accomplishment Instructions of Dornier Service Bulletins SB-328-31-016, dated 2 April 1997" (Requirements 1 and 2). The operator is therefore obliged to use the referenced service bulletin’s methods when performing the work.

Rights and practical entitlements

• No discretion to ignore the service bulletin: The AD makes the service bulletin mandatory by reference; an operator does not have discretion to use alternative methods in place of the specified Accomplishment Instructions unless and until an alternative is approved by the competent authority. The AD text itself directs compliance by reference to the service bulletin.

• Time-limited operational restriction: If damage is found during inspection, the AD requires replacement before further flight (Requirement 2, Compliance). Operationally, the aircraft cannot resume flying until the replacement and sealing are completed. The AD therefore grants no right to continue operations with a damaged panel.

• Procedural clarity on scope: The AD limits duties to aircraft with the specified panels and serial-number ranges (Applicability). Operators whose aircraft do not have panel 10VE or 11VE as specified are not subject to the AD’s duties under the text as published.

• Right to rely on the AD’s stated method for compliance: Because the AD prescribes a specific service bulletin, completing the Accomplishment Instructions of SB-328-31-016 in the specified manner should, in practice, satisfy the operator’s duty under the AD. The text does not provide a process for alternative compliance in the AD language itself.

Delegation and administrative posture

• Issuing authority and delegate: The AD is issued by the Civil Aviation Safety Authority and signed by its delegate, James Coyne (signature block). The AD is therefore an administrative measure emanating from the national safety regulator rather than a contractual term.

What the duties do not include

• The AD does not specify penalties or enforcement mechanisms within its text. It prescribes inspection and corrective actions plus compliance timelines, but does not in the text itself set out sanctions, infringement notices, or civil penalty provisions. The AD likewise does not specify recordkeeping requirements or the format of evidence of compliance. Those matters may be governed by other regulatory instruments, but they are not set out in this AD document.

• The AD does not permit continued flight with a damaged panel; it mandates replacement prior to further flight if damage is found.

In sum, the AD creates clear mandatory duties: inspect (within 30 days), install sealing where no damage is found, and replace plus seal where damage is found before further flight. The service bulletin SB-328-31-016 is the operative technical standard for execution.

The AD text does not specify monetary penalties, infringement processes or detailed enforcement mechanisms within its content. The directive prescribes mandatory actions and compliance deadlines but contains no explicit penalty clauses, fine schedules or administrative enforcement processes in the document provided. It identifies the issuing authority by signature,James Coyne, Delegate of the Civil Aviation Safety Authority,and includes an effective date of 19 January 2006 (signature block; Compliance). That imprints administrative authority but does not itself enumerate enforcement steps.

Given the AD’s nature as an airworthiness directive issued by the Civil Aviation Safety Authority, the practical enforcement environment to which operators would be subject typically includes the regulator’s existing compliance tools, but the AD text does not expressly list those tools. The AD does require that maintenance be performed "in accordance with the Accomplishment Instructions of Dornier Service Bulletins SB-328-31-016, dated 2 April 1997" (Requirements 1 and 2). Failure to comply with the AD’s mandatory instructions would, in practical terms, leave an aircraft non-compliant with the AD and therefore potentially non-airworthy under the jurisdiction’s airworthiness rules; the AD text does not spell out the consequences of non-compliance.

Operational enforcement implications embedded in the AD’s requirements

• The AD conditions further flight on rectification where damage is found: Requirement 2 is explicit that replacement and sealing must be completed "before further flight after the Requirement 1.a. inspection" (Requirement 2; Compliance). That operational restriction is a direct compliance mechanism: aircraft with damaged panels cannot legally be returned to service under the AD until the work is done, per the plain wording.

• Time-bound compliance creates detectable non-compliance: Requirement 1 must be completed within 30 days after the AD effective date (Compliance). Failure to perform the inspection within that period is a clear non-compliance event under the AD’s own timeline.

What the AD does not state

• The AD does not set out civil penalties, administrative fines, suspension or revocation procedures, or criminal sanctions for non-compliance in the AD text provided.

• The AD does not specify the evidence or records required to demonstrate compliance, nor a form or certificate to be lodged with the regulator.

Because the document does not specify enforcement mechanisms or penalties, parties seeking to understand sanctions or enforcement processes will need to consult the wider regulatory framework or the Civil Aviation Safety Authority’s enforcement policies (not contained in the AD text supplied). The AD itself establishes mandatory technical and timing obligations; practical enforcement would be effected by the regulator under its general enforcement powers, which are not recited in the AD.

Within the text of this AD, the explicit statutory interactions are limited to references to manufacturer service material and a prior foreign airworthiness directive. The AD makes direct reference to Dornier Service Bulletins SB-328-31-016 dated 2 April 1997 by directing that the required inspections, sealing installations and replacements be performed "in accordance with the Accomplishment Instructions" of that service bulletin (Requirements 1 and 2). The AD also contains a Note stating "LBA AD 97-136 refers" (Note). Those references create an operational interaction with manufacturer-issued service documentation and a previously issued airworthiness directive by another authority.

What the AD does not do in its text

• The AD does not cite or quote other domestic statutes, regulations or enforcement provisions in its body. It does not, within the AD text provided, specify interactions with certification regulations, continuing airworthiness obligations, or operator licensing provisions. Therefore, the AD’s legal force as an instrument must be understood in the context of the issuing regulator’s broader legal framework, which is not reproduced inside the AD text.

Operational and technical interaction mechanisms

• Incorporation by reference of a service bulletin: By mandating work "in accordance with the Accomplishment Instructions" of SB-328-31-016, the AD integrates manufacturer procedures into the regulatory obligation. This means the required technical standard for compliance is the service bulletin’s Accomplishment Instructions rather than bespoke technical text within the AD.

• Cross-reference to an LBA AD: The inclusion of "LBA AD 97-136 refers" signals that the same or a related safety issue was addressed by the German Luftfahrt-Bundesamt, and that compliance or technical content may be harmonised with that prior directive. The AD thus situates itself in an international airworthiness practice where regulators and manufacturers exchange and reference related directives and service bulletins.

Practical effects in regulatory compliance

• The AD’s mandate that operators follow a specific service bulletin creates dependence on the content and availability of that bulletin. If the service bulletin prescribes particular actions or parts, compliance with the AD will necessarily require adherence to those parts and procedures.

• The AD’s operational restriction on flying with damaged panels until replacement is completed creates an interface with operational regulations that govern airworthiness and flight release; those regulations are not reproduced in the AD but will be engaged in practice if an aircraft is found non-compliant.

• Because the AD does not specify enforcement mechanisms, enforcement will be carried out under the regulator’s general powers; the AD therefore functions as a technical directive whose effect is realised by the broader regulatory scheme.

In short, the AD interacts directly with manufacturer service material and indirectly with prior foreign ADs. It imposes a mandated technical standard (SB-328-31-016) that operators must use to meet the AD, and it will be enforced through the issuing regulator’s general supervisory and enforcement framework, which is not detailed in the AD text.

The AD as provided bears the identifier AD/DO 328/20 Circuit Breaker Panels 10VE & 11VE Sealing and the date marker "1/2006" (header). It is signed by James Coyne, Delegate of the Civil Aviation Safety Authority, on 29 November 2005 (signature block), and records an effective date of 19 January 2006 for coming into force (Compliance). The AD itself contains a note that references "LBA AD 97-136" and cites Dornier Service Bulletins SB-328-31-016 dated 2 April 1997 as the Accomplishment Instructions to follow (Requirements and Note). The material available in the AD text does not set out any subsequent amendments to this particular directive.

What the AD explicitly states about prior material and references

• The AD requires actions to be performed "in accordance with the Accomplishment Instructions of Dornier Service Bulletins SB-328-31-016, dated 2 April 1997" (Requirement 1 and Requirement 2). That identifies the technical service bulletin that informs how the inspections, sealing and replacement are to be carried out.

• The AD’s Note indicates "LBA AD 97-136 refers," which signals a prior related directive by the Luftfahrt-Bundesamt. The AD text does not provide the content of that LBA AD or state whether the current AD supersedes, amends, or is supplementary to the LBA AD. The text simply records the reference.

What the AD does not provide about amendment history

• The AD does not include a revision log, amendment schedule, or notes of prior or subsequent versions of AD/DO 328/20 within the text provided. There is no statement of repeal or amendment of earlier ADs, nor is there an annex listing superseded ADs.

• The AD does not provide an explicit mechanism within its text for seeking an alternative method of compliance (AMOC) or for obtaining exemptions, nor does it record any later modifications to compliance dates, applicability, or technical requirements.

Interpretation for users seeking amendment information

• Based on the document, the original issuance dates are the relevant historical markers: service bulletin dated 2 April 1997, LBA AD 97-136 as a referenced prior action, signature 29 November 2005, and effective date 19 January 2006. No later amendments or revisions are recorded in the AD text provided.

• Operators or analysts requiring a complete amendment history will need to consult the regulator’s consolidated AD database, administrative registers, or follow-up publications to determine whether AD/DO 328/20 was later revised, superseded or rescinded. Those sources are not included in the AD text supplied.

In short, the AD documents a cross-reference to a 1997 service bulletin and a 1997 LBA AD, and it records an issuing signature on 29 November 2005 with an effective date of 19 January 2006. The AD text supplied does not contain any internal record of amendments beyond those dates and references.

The AD text supplied contains no information about litigation, judicial review, appeals, or formal legal challenges to AD/DO 328/20. It does not report any court decisions, administrative appeals, or disputes arising from the directive. The document simply sets out the technical requirements, applicability and compliance timelines and includes a signature by James Coyne, Delegate of the Civil Aviation Safety Authority (signature block).

What the AD does say that is relevant to legal challenge potential

• The AD prescribes mandatory technical and timing obligations, including an inspection within 30 days of the AD’s effective date and a prohibition on further flight with damaged panels until replacement and sealing are completed (Requirement 1; Requirement 2; Compliance). These clear, short-term operative duties would be the typical subject matter of any compliance dispute or administrative review, but the AD text does not provide a record of any such proceedings.

• The AD references a specific manufacturer service bulletin as the normative technical instrument to be followed (SB-328-31-016, 2 April 1997). Disputes about the adequacy, clarity or applicability of that service material could, in principle, be grounds for dispute, but the AD contains no record of any such litigation.

Absence of litigation reporting in the document

• The AD does not include a footer or annex summarising legal challenges or administrative appeals, nor does it refer to any adjudicative proceedings.

• If litigation occurred after issuance, the AD text provided does not reflect it. To find any litigation history, one would need to search court records, administrative appeals records or the regulator’s own adjudicative notices. Those sources are outside the AD text supplied.

Therefore, based on the document at hand, there is no recorded litigation history appended to or contained within AD/DO 328/20. The AD is presented as a technical directive without accompanying legal-historical notes.

Several practical pitfalls and potential operational misunderstandings arise directly from the AD text. The following items are mechanical and textual issues that operators, maintenance providers and compliance staff should note because they affect interpretation, scheduling and required actions.

1. Narrow applicability is serial-number specific: The AD applies only to Model 328-100 aeroplanes with panel 10VE (serial numbers up to and including 131) or panel 11VE (serial numbers up to and including 133) installed (Applicability). A misreading of the "up to and including" language could lead to incorrect inclusion or exclusion of an aircraft. Operators must verify the panel serial number and confirm installation before assuming applicability.

2. The service bulletin is normative: The AD repeatedly requires that the work be carried out "in accordance with the Accomplishment Instructions of Dornier Service Bulletins SB-328-31-016, dated 2 April 1997" (Requirement 1; Requirement 2). That means the service bulletin’s detailed procedures, parts lists and acceptance criteria are the controlling technical standard. Using a different procedure or an outdated revision of the service bulletin could be non-compliant if not expressly approved.

3. Short compliance window for inspection: Requirement 1 must be completed within 30 days after the AD’s effective date, which is 19 January 2006 (Compliance). The AD creates a short-term scheduling demand; operators must have planned for that 30-day window and for the possibility of immediate replacement before next flight in the event damage is found.

4. Replacement before further flight if damage found: Requirement 2 requires replacement and sealing "before further flight after the Requirement 1.a. inspection" if damage or evidence of burning is found. Operationally, this means an aircraft found to have damage cannot legally be returned to service until replacement and sealing are complete. There is no allowance for ferry flights or deferred rectification in the AD text.

5. Even "no damage" requires modification: Even if the inspection finds no damage, the AD requires installation of additional sealing at back-lighting wire contact points (Requirement 1.b). Some operators might assume that no damage equals no work; the AD removes that option and mandates a preventive modification.

6. Cross-reference to LBA AD: The AD contains a Note stating "LBA AD 97-136 refers." That could imply related obligations or previous corrective actions. Operators should not assume the LBA AD is identical; they should consult the referenced document where relevant. The AD does not reproduce the LBA AD’s text, so assuming parity without checking could be a mistake.

7. Parts and materials availability: The AD requires installation of additional sealing and potentially replacement of panels (Requirement 1.b; Requirement 2). If replacement panels or the sealing materials specified in the service bulletin are not readily available within the 30-day inspection window, operators may face grounding or operational disruption. The AD text does not provide alternative instructions if parts are scarce.

8. Recordkeeping and evidence of compliance are not specified: The AD does not set out what records must be kept or how compliance should be notified to the regulator. Operators must ensure they maintain contemporaneous maintenance records and, where required by other regulatory provisions, produce records of compliance, even though the AD text does not itself specify a format.

9. Ambiguity about who signs off work: The AD requires work to be performed in accordance with the service bulletin but does not specify which certifying staff or approvals are required for release to service. Usual aviation maintenance certification practices will apply, but the AD text itself does not address signatures or certification forms.

10. Effective date versus signature date: The AD is signed 29 November 2005 but becomes effective 19 January 2006 (signature block; Compliance). Operators must use the effective date for counting the 30-day compliance period, not the signature date. Mistaking the signature date for the effective date could produce late compliance.

11. Limited text on enforcement: The AD does not specify penalties or enforcement mechanisms. Operators should not interpret this to mean non-compliance has no consequences; the absence only means enforcement detail appears elsewhere in the regulator’s instruments.

12. Scope limited to back-lighting wire contact points: The sealing requirement is limited to additional sealing at the contact points of the panel back lighting wires (Requirement 1.b; Requirement 2). Operators must not assume broader rewiring or panel redesign is required unless the service bulletin specifies it.

In short, the primary gotchas are: verifying serial numbers and panel installation, following the specific service bulletin revision, meeting a tight compliance deadline, treating a "no damage" finding as still requiring work, and addressing parts availability and release-to-service protocol despite the AD’s silence on recordkeeping and enforcement procedures.

The AD prescribes a clear sequence of mandatory steps and references a specific service bulletin for the technical execution. The following checklist and practical steps are drawn directly from the AD text and its referenced service bulletin instructions as the required method of compliance.

1. Verify applicability immediately

• Confirm whether the aircraft is a Dornier Model 328-100 and whether it has circuit breaker panel 10VE or 11VE installed (Applicability).
• For each installed panel, verify the panel serial number. The AD applies only to panel 10VE with serial numbers up to and including 131, and panel 11VE with serial numbers up to and including 133 (Applicability). If the panel serial number is outside these ranges, the AD does not apply per its text.

2. Obtain the referenced service bulletin

• Acquire Dornier Service Bulletin SB-328-31-016, dated 2 April 1997. The AD requires that the inspection, sealing installation and replacement be carried out "in accordance with the Accomplishment Instructions" of that service bulletin (Requirements 1 and 2). Use the exact dated revision cited.

3. Schedule the inspection within the AD’s timeframe

• Note the AD’s effective date: 19 January 2006. Requirement 1 (visual inspection) must be completed within 30 days after that effective date (Compliance). Plan maintenance slots, staffing and parts procurement accordingly to ensure inspection is completed in that period.

4. Conduct the inspection per the service bulletin

• Perform the visual inspection of panels 10VE and 11VE for damage or signs of burning, following the detailed steps and acceptance criteria in SB-328-31-016 (Requirement 1.a). Ensure maintenance personnel are qualified and authorised to perform and certify the inspection per applicable maintenance regulations.

5. If no damage or burning is found

• Install additional sealing at the contact points of the panel back-lighting wires in accordance with the service bulletin’s Accomplishment Instructions (Requirement 1.b). Record the work performed, the part numbers or materials used for sealing, and the identity and authorisation of the certifying technician.

6. If damage or burning is found

• Do not dispatch the aircraft. Requirement 2 mandates replacement of the damaged panel and installation of the additional sealing at the back-lighting wire contact points, following the service bulletin (Requirement 2).
• Complete the replacement and sealing before further flight after the inspection (Compliance). Ensure parts are available, or arrange timely procurement, because the AD requires rectification prior to any subsequent flight.

7. Documentation and certification

• Although the AD text does not specify recordkeeping formats, document: the inspection date, findings, service bulletin revision used, details of any sealing installation (materials, part numbers), details of any panel replacement (panel serial number of replacement, part number), and the name and authorisation of the certifying engineer or maintenance organisation.
• Prepare release-to-service documentation in accordance with applicable maintenance regulation and the operator’s procedures, certifying that the AD work has been completed per SB-328-31-016.

8. Check cross-references and prior directives

• The AD notes "LBA AD 97-136 refers" (Note). Review that referenced LBA AD to confirm whether any additional technical or compliance considerations apply to your aircraft given its maintenance history or prior compliance actions.

9. Communicate with operational staff

• Inform flight operations and dispatch that the aircraft has either been inspected and modified or replaced and sealed as required, and confirm that the aircraft is cleared for flight only after certifying maintenance release. If damage was found, ensure the aircraft remains grounded until maintenance release is issued following replacement and sealing.

10. Track follow-up and future obligations

• Maintain a traceable record of compliance with AD/DO 328/20 as part of the aircraft’s continuing airworthiness records. Although the AD does not specify further repetitive inspections or monitoring intervals, keep the records accessible for any future audits, lessor inspections, or regulator inquiries.

11. Address parts shortages and scheduling constraints proactively

• If replacement panels or specified sealing materials are not immediately available, engage supplier channels and maintenance planning early. Because Requirement 2 requires replacement before further flight, lack of parts can result in grounded aircraft; proactive procurement minimises disruption.

12. Seek formal guidance where necessary

• If there is doubt about the correct service bulletin revision, the appropriate certifying authority, or an alternative method of compliance, seek formal guidance from the regulator or obtain an approved alternative method of compliance (AMOC) through the regulator, recognising that the AD itself requires compliance "in accordance with" the specified service bulletin (Requirements 1 and 2). The AD text does not provide an AMOC process; consult the regulator’s procedures.

By following the inspection schedule, performing work strictly according to SB-328-31-016, documenting all actions and ensuring replacement and sealing are completed before further flight where damage is discovered, an operator will have fulfilled the obligations set out in AD/DO 328/20 as stated in the AD document.