AD/DAUPHIN/63 Amdt 1 - Tail Rotor Blade Tuning Weights

This directive centres on a small set of definitional and procedural concepts that determine scope and required action.

Applicability criteria: The directive applies only to Model AS 365 N3 helicopters that meet a combination of modification status and installed parts. Specifically it applies “after incorporation of Modification 0764B39 (Service Bulletin No. 64.00.21) and before incorporation of Modification 0764B48,” and only where the tail rotor hub part number is 365A33-3500-02 or -03 and the blade attachment bushes are part number 365A33-3530-20 (Applicability). Those three discrete identifiers (modification status and two part numbers) are the gatekeepers for whether an individual airframe falls within the AD.

Action mechanism: The technical remedy is the installation of a tuning weight on each blade of the tail rotor “in accordance with Eurocopter AS 365 N Alert Service Bulletin No. 64.00.23.2” and then accomplishment of paragraph 2.C of Eurocopter ASB No. 64.00.23 Revision 1 (Requirement). The ASB is therefore the operative technical manual for the hands-on work; the AD does not set detailed torque values, rivet types, or inspection intervals itself, it references the manufacturer’s ASB for procedural detail.

Pre‑condition links between documents: Note 1 expressly conditions compliance with ASB No. 64.00.23 Revision 1 for AS 365 N3 helicopters on prior compliance with Eurocopter Service Bulletins No. 64.00.21 and No. 65.00.14. For spares held for later installation, the AD prescribes replacing blade attachment bushes and modifying and re‑identifying hubs per specific paragraphs of the ASB Rev 1 (Requirement). The AD therefore chains compliance across multiple manufacturer service documents rather than standing alone.

Two-tier compliance timing: The Compliance box establishes two different time triggers. One is an absolute date,“before 30 April 2003”,for Requirement 1 unless already accomplished. The second is an event-based trigger,the next time the tail rotor hub is removed, and at the latest by 31 December 2006. The text also notes that the amendment does not change the initial compliance time for Requirement 1.

Safety rationale stated: The Background explains the safety problem the directive addresses , “an increase in the level of vibration is being felt by crews in the pedal units during level flight at high speed” , and states that the tuning weights are installed to eliminate the vibration and “preclude any risk of failure at the pitch control of each blade.” The AD notes it is responding to an EASA AD and that Amendment 1 clarifies identification requirements in paragraph 2.C and corrects part numbers in paragraph 3.E of the requirement document.

Cross-reference to foreign regulator: The AD explicitly refers to an EASA AD (EASA AD 2006-0078) and Eurocopter ASBs and Service Bulletins, so the directive’s regime operates by incorporating manufacturer and EASA texts as binding requirements for the affected Australian-registered helicopters.

Document status: The AD is presented as Amendment 1 to AD/DAUPHIN/63 and is dated 6/2006, effective 8 June 2006. The signature line identifies a CASA delegate, Richard Castles, as the issuing official (header and signature).

Taken together, the main concepts are narrow applicability by part numbers and mod status, incorporation of Eurocopter ASBs for technical detail, conditional requirements for spares and hubs, and dual compliance deadlines with an absolute and event-driven latest date.

The instrument explicitly targets a defined group of aircraft and, by implication, their operators, maintenance organisations, and parts suppliers.

Aircraft operators: The directive applies to Model AS 365 N3 helicopters of a specific configuration: those equipped with a quiet fenestron tail rotor after incorporation of Modification 0764B39 and before incorporation of Modification 0764B48, and fitted with a tail rotor hub part number 365A33-3500-02 or -03 and blade attachment bushes part number 365A33-3530-20 (Applicability). Operators of those exact-configured AS 365 N3 airframes must comply with the listed requirements. Operators of AS 365 N3 helicopters that have already incorporated Modification 0764B48, or that are not equipped with the specified hub or bush part numbers, are not captured by the text as written.

Maintenance organisations and engineers: The requirement to install tuning weights “in accordance with Eurocopter AS 365 N Alert Service Bulletin No. 64.00.23.2” and to accomplish paragraph 2.C of ASB No. 64.00.23 Revision 1 places the technical execution burden on maintenance personnel who will need to follow the ASB’s procedures. Note 1 adds further technical preconditions: for AS 365 N3 helicopters, compliance with ASB No. 64.00.23 Revision 1 “requires prior compliance with AS 365 N Service Bulletins No. 64.00.21 and No. 65.00.14.” Maintenance organisations therefore must verify historical compliance with these Service Bulletins and, when installing spare components, carry out replacement of blade attachment bushes and modification/re-identification of hubs per specified ASB paragraphs (Requirement).

Parts suppliers and spares inventories: The AD contains explicit instructions about spares: before installation of blade attachment bushes and tail rotor hubs held as spares, the blade attachment bushes must be replaced per paragraph 2.B.5 and the tail rotor hubs must be modified and re-identified per paragraphs 2.B.2 and 2.C of ASB Rev 1 (Requirement). Parts managers and suppliers of spare hubs and bushes must therefore ensure that items in stock either meet the modified/re‑identified standard or are processed prior to installation.

Regulatory actors: CASA, via its delegate Richard Castles, issued the amendment. The directive references an EASA AD (EASA AD 2006-0078) and Eurocopter documentation. The instrument therefore situates Australian regulatory action in relation to manufacturer and European Aviation Safety Agency material; CASA acts as the issuer of the mandatory directive for Australian-registered aircraft, and the document names the CASA delegate (signature).

Flight crew / operators: Although the directive is technical, there is an operational safety link: the Background reports increased vibration felt by crews in the pedal units during high speed level flight. Crew members flying affected configurations are therefore stakeholders insofar as the measure aims to remove an in‑flight vibration that could affect handling or safety of controls.

Owners and lessors: Owners and lessors of affected airframes bear financial costs for parts, maintenance labour and downtime to accomplish the ASB work. The directive’s spares rules also affect owners who hold inventory; spares must be brought into compliance before installation.

Absent groups: The AD does not apply to AS 365 variants outside the identified mod or part-number window. It does not state obligations for other helicopter types, other operators, or third parties beyond those directly undertaking the work specified in the Eurocopter ASB.

In sum, the directive affects aircraft precisely by configuration, and those who maintain, supply, operate, or manage such airframes, through mandatory technical work and parts-handling rules set out in Eurocopter service documentation referenced by the AD.

This AD establishes narrowly defined duties for operators, maintenance organisations and parts handlers. It does not enumerate rights or remedies; any rights are implicit in the structure of the directive and the referenced ASBs.

Primary duty , installation: Operators of affected AS 365 N3 helicopters must install a tuning weight on each tail rotor blade “in accordance with Eurocopter AS 365 N Alert Service Bulletin No. 64.00.23.2” and must then accomplish paragraph 2.C of Eurocopter ASB No. 64.00.23 Revision 1 (Requirement). The AD makes the ASB procedure the required method for intervention; the duty is to follow those specified manufacturer procedures.

Pre‑condition duties , prior service bulletins: For AS 365 N3 helicopters, the AD states that compliance with ASB No. 64.00.23 Revision 1 “requires prior compliance with AS 365 N Service Bulletins No. 64.00.21 and No. 65.00.14” (Note 1). This is a declarative duty: maintainers/operators must verify and ensure that those prior service bulletin tasks have been completed before relying on the ASB Rev 1 procedure.

Spares handling duties: Where blade attachment bushes and tail rotor hubs are held as spares for later installation, the AD requires that, before installation: (a) the blade attachment bushes must be replaced in accordance with paragraph 2.B.5 of ASB No. 64.00.23 Revision 1; and (b) the tail rotor hubs must be modified and re‑identified in accordance with paragraphs 2.B.2 and 2.C of ASB No. 64.00.23 Revision 1 (Requirement). This duty imposes an obligation on parts custodians and on maintenance organisations installing spares.

Timing duties: The AD sets deadlines. Requirement 1 must be accomplished “unless already accomplished, before 30 April 2003.” A second timing duty is triggered by a maintenance event: the work must be accomplished “the next time the tail rotor hub is removed, and at the latest by 31 December 2006.” The AD further states that the amendment does not change the compliance time for Requirement 1. These are temporal duties the operator must meet or demonstrate prior accomplishment.

Reference duty: The requirement to follow Eurocopter ASBs imports an obligation to obtain, understand and implement the specific ASB procedures and to ensure the referenced paragraphs (eg, 2.B.2, 2.B.5, 2.C) are followed. The AD therefore creates an administrative duty to consult and act in accordance with the referenced manufacturer documentation.

Rights (implicit): The directive does not set out discrete statutory rights, approvals or exemptions. The only “right-like” elements implicit in the text are procedural: if the work has already been accomplished, the operator is not required to do it again (Compliance: “Unless already accomplished…”). The AD also ties compliance to specific ASB paragraphs, which gives maintenance organisations a clear, specified method to discharge the duty , that precision reduces ambiguity about acceptable means of compliance.

No penalties or enforcement regime stated: The AD itself does not list penalties, enforcement measures, or appeal processes; it states required actions, applicability and compliance dates. Any enforcement, certificates, or administrative interactions would need to be inferred from the broader regulatory framework or other CASA instruments, but such inferences are not contained in this AD text.

Documentation duty (implied): Because the AD references previous Service Bulletins and modifies parts held as spares, operators and maintainers will need to have records of prior compliance with the cited Service Bulletins and records of modification/re-identification when spares are processed, although the AD does not prescribe record retention periods or formats.

In summary, the AD creates precise technical duties: install tuning weights per ASB, accomplish specified ASB paragraphs, ensure prior Service Bulletins have been complied with for N3 helicopters, and bring spares and hubs into compliance before installation, each within the specified time windows.

The AD text supplied does not articulate penalties, enforcement mechanisms, or sanctions. The instrument sets out mandatory technical actions, applicability, and compliance times, but it does not include language describing administrative penalties, criminal liability, suspension of certificates, or the procedures CASA will follow to enforce non‑compliance. The document identifies CASA as the issuer through its delegate, Richard Castles, but it contains no explicit enforcement provisions.

What the text does provide that can bear on enforcement is binding content and deadlines: the AD requires installation of tuning weights and specific spares-handling actions “in accordance with” Eurocopter ASBs, and specifies two compliance triggers including absolute and event-driven dates (Compliance). Those requirements create objective criteria that an enforcement authority could observe or audit. The AD also states that Amendment 1 was issued in response to an EASA AD and that it corrects identification and part-number issues in the Requirement document (Background), which adds a traceable technical basis for inspection.

Because the AD itself is silent on penalties, an affected operator or maintenance organisation will need to consult CASA’s broader regulatory framework and the relevant Civil Aviation Regulations, manuals of standards, or enforcement policy documents to determine the consequences of non-compliance. The AD’s absence of a penalty clause does not mean the actions are optional; instead, it makes the directive a mandatory technical instruction whose compliance status would be assessed under the applicable statutory/regulatory enforcement regime outside the AD text.

Practical implications of the AD’s silence on enforcement: Operators cannot rely on the AD text alone to learn whether failure to comply will trigger particular sanctions; they must look to CASA’s enforcement instruments and the Civil Aviation Act and regulations (not included in this document) for enforcement pathways. The AD does emphasise clear, observable technical obligations (installation per the ASB, replacement/modification of spares, part-number specificity and dates) which would facilitate any regulatory audit or inquiry, but the document does not itself state who will inspect, how compliance will be certified, or what administrative or legal consequences will follow from contravention.

Finally, the AD’s reference to EASA AD 2006-0078 signals that there may be parallel or overlapping regulatory expectations from EASA for aircraft operating under its jurisdiction, but the AD text does not set out how CASA will coordinate enforcement with EASA or with Eurocopter documentation beyond stating the cross-reference.

The AD interacts directly with manufacturer service literature and an EASA airworthiness directive; the supplied text does not explicitly reference Australian statutes or regulations, but it embeds other documents as the operative technical means for compliance.

Interaction with manufacturer documents: The AD makes Eurocopter ASB No. 64.00.23 (and its Revision 1) the technical standard for required work: installation of tuning weights is required “in accordance with Eurocopter AS 365 N Alert Service Bulletin No. 64.00.23.2” and paragraph 2.C of ASB No. 64.00.23 Revision 1 must be accomplished (Requirement). The AD also requires that, for AS 365 N3 helicopters, prior compliance must be shown with AS 365 N Service Bulletins No. 64.00.21 and No. 65.00.14 before relying on the ASB Rev 1 (Note 1). For spares, specific paragraphs of the same ASB (2.B.2, 2.B.5, 2.C) are incorporated for replacement, modification and re-identification. Thus, the AD does not supplant manufacturer technical instructions; it imports them as binding requirements.

Interaction with EASA: The AD states it is issued in response to an EASA AD and explicitly references EASA AD 2006-0078 (Note 2 and Background). This links CASA’s action to an EASA determination and aligns the Australian requirement with an identified European airworthiness action. The interaction is one-way in the text: CASA’s AD incorporates EASA’s work as the impetus and references it, rather than reproducing EASA’s text.

Interaction with prior CASA directives: The instrument is an amendment , AD/DAUPHIN/63 Amdt 1 , and it states that “The compliance time for Requirement 1 remains unchanged by this issue of the Directive” (Compliance). This indicates the amendment changes content of the prior directive but leaves at least some original compliance timing intact. The AD also states it corrects part numbers and clarifies paragraph identification from the Requirement document, indicating it supersedes or refines earlier wording.

Statutory/regulatory framework not reproduced: The AD does not recite the Civil Aviation Act, Civil Aviation Regulations, or CASA enforcement powers. It therefore assumes the reader understands that ADs operate within a broader legal framework and that CASA has authority to issue mandatory airworthiness directives. Because those statutes and regulations are not part of the supplied text, their contents and mechanisms are not stated here.

Operational and contractual interfaces: The AD’s requirement that spares held as stock be modified and re‑identified before installation will interact with commercial arrangements for spares procurement, storage, and installation. Those interactions , such as contractual obligations between lessor and operator, or between supplier and customer , are not addressed in the AD text, but the technical obligation will constrain how those contracts are performed.

Recordkeeping and certification interaction: The AD references procedural compliance with ASBs and prior service bulletins, which implies that maintenance records must demonstrate such compliance. The AD does not provide recordkeeping standards, but in practice these technical obligations will interact with continuing airworthiness records and logbooks, and with certification processes for return-to-service. Those specifics lie outside this text.

In summary, the AD directly imports Eurocopter ASBs and references an EASA AD, and it amends a prior CASA directive. It does not set out explicit interactions with domestic statutes or enforcement regimes within the text provided; those broader legal interactions must be located in the wider regulatory framework beyond this instrument.

The supplied text presents a concise amendment history limited to this instrument’s status as Amendment 1 to AD/DAUPHIN/63.

Designation and dates: The header identifies the instrument as “AD/DAUPHIN/63 Amdt 1” and dates it 6/2006. The signature block is dated 20 April 2006 and signed by Richard Castles, Delegate of the Civil Aviation Safety Authority. The AD states, “This Amendment becomes effective on 8 June 2006.” The Compliance box also remarks that “The compliance time for Requirement 1 remains unchanged by this issue of the Directive,” indicating that the amendment adjusts parts of the requirement document but not the original deadline for Requirement 1.

Reason for amendment: The Background explains the operational trigger , crew-experienced increases in vibration , and says Amendment 1 “is issued in response to an EASA AD, which introduces a revision of the Requirement document, clarifies the identification requirements of paragraph 2.C and corrects part numbers in paragraph 3.E of the requirement document.” That statement identifies three amendment functions: (1) to respond to the EASA AD, (2) to introduce a revision of the Requirement document (via the referenced ASB Revision 1), and (3) to clarify paragraph identification and correct part numbers that previously may have been incorrect or ambiguous.

Changes effected: The amendment specifically incorporates Eurocopter AS 365 N Alert Service Bulletin No. 64.00.23.2 and ASB No. 64.00.23 Revision 1 as the requirement documents. It also inserts or restates precise part numbers for tail rotor hubs (365A33-3500-02 or -03) and blade attachment bushes (365A33-3530-20) in the Applicability, and prescribes additional steps before installation of bushings and hubs held as spares. The text reports that Amendment 1 clarifies identification requirements of paragraph 2.C and corrects part numbers in paragraph 3.E of the requirement document; those corrected paragraphs are part of the referenced ASB Rev 1, now incorporated.

Relationship to original AD: The instrument is labelled as an amendment and contains the statement that the compliance time for Requirement 1 is unchanged. This implies that an original AD/DAUPHIN/63 existed prior to Amdt 1 with at least one compliance time that is retained by the amendment. The supplied text does not reproduce the earlier version, so the exact differences beyond clarified identification and corrected part numbers are not shown in this document.

Cross-references external to CASA: Amendment 1 explicitly acknowledges EASA AD 2006-0078 as the foreign regulatory driver that prompted the revision. The AD therefore shows a cross-jurisdictional amendment linkage, where an EASA action results in CASA issuing a corresponding amendment for Australian-registered helicopters.

In sum, the amendment history in the supplied text is limited but clear: this document is Amendment 1 to AD/DAUPHIN/63, issued in 2006, effective 8 June 2006, and revises the requirement document to incorporate ASB Revision 1, clarify paragraph identification, and correct part numbers in response to an EASA AD.

The supplied document contains no litigation history. There is no mention of legal challenges, appeals, judicial review, or prior litigation related to this AD in the text provided. The instrument is presented as an administrative airworthiness directive issued by CASA’s delegate and makes no reference to any court proceedings or contested administrative processes.

Because this AD does not include any litigation narrative or references to disputes, the record supplied does not indicate whether the directive has been the subject of disagreement between operators and CASA, challenged in court, or otherwise litigated. The AD does refer to an EASA AD (EASA AD 2006-0078) as the basis for the amendment, but the text does not say whether EASA’s AD was litigated or whether that process influenced the CASA amendment beyond prompting revision to the requirement document and correction of part numbers.

Absent any litigation data in the instrument, readers who require information on legal challenges, precedential decisions, or disputes arising from this AD must consult court records, administrative tribunal records, CASA enforcement files, or subsequent CASA publications that are not part of the supplied text.

In practical terms, because the AD imposes technical obligations and cross-references manufacturer ASBs, disputes that might arise could concern the scope of applicability, the sufficiency of alternative means of compliance, the timing of compliance deadlines, or the correctness of part-number specifications. None of those disputes or their outcomes are recorded in the supplied document.

Therefore, as far as the text provided shows, there is no litigation history to report.

The AD contains several points that may create operational, administrative, or interpretative pitfalls for operators, maintainers and parts custodians. These are derived directly from the wording of the instrument.

1. Narrow and detailed applicability criteria: Applicability is tied to modification status (after Mod 0764B39 and before Mod 0764B48), a tail rotor type (quiet fenestron), a specific helicopter model (AS 365 N3), and precise part numbers for the tail rotor hub (365A33-3500-02 or -03) and blade attachment bushes (365A33-3530-20). If an operator misreads or misrecords modification status or part numbers, they may mistakenly think the AD does not apply, or conversely apply it unnecessarily. The AD’s gatekeeping criteria are technical and exacting (Applicability).

2. Retroactive-seeming compliance date: The Compliance section states Requirement 1 must be done “Unless already accomplished, before 30 April 2003.” The AD is Amendment 1 dated 2006 and effective 8 June 2006, so the absolute date predates the amendment. That creates a potential confusion: the AD affirms the original deadline remains unchanged, but readers must reconcile the 2003 deadline with a 2006 amendment. Operators must check maintenance records to determine whether Requirement 1 was previously accomplished; failing to do so could lead to misunderstanding about outstanding obligations (Compliance; note that the AD states the compliance time remains unchanged by this issue).

3. Two different compliance triggers: There is an absolute date and an event-based deadline for hub removal (“next time the tail rotor hub is removed, and at the latest by 31 December 2006”). Organisations must track both historical compliance and future maintenance events. Failure to monitor the hub removal event or to plan for the 31 December 2006 deadline may lead to last-minute rushes or unexpected aircraft downtime (Compliance).

4. Multi-document dependency: The technical work is specified by Eurocopter ASB No. 64.00.23 Revision 1 and ASB No. 64.00.23.2, but compliance for AS 365 N3 helicopters is conditional on prior compliance with Service Bulletins No. 64.00.21 and No. 65.00.14 (Note 1). Operators must verify prior bulletins were completed. If records are incomplete or ambiguous, maintainers may need to perform retrofit work to accomplish the prior Service Bulletins before proceeding, potentially increasing scope and cost.

5. Spares-handling traps: The AD requires that blade attachment bushes and tail rotor hubs held as spares be processed (blade attachment bushes replaced per paragraph 2.B.5; hubs modified and re-identified per paragraphs 2.B.2 and 2.C) before installation (Requirement). Spare parts in inventory that are not already modified/re-identified cannot be installed without first processing them. Parts managers need to identify inventory and ensure spares are either modified or quarantined to avoid inadvertent installation of non‑compliant components.

6. Reliance on manufacturer paragraph numbering: The AD references specific paragraphs (2.B.2, 2.B.5, 2.C) of ASB No. 64.00.23 Revision 1. Amendments, revisions, or future re-numbering of the ASB could create confusion about which actions are required. The AD’s text does not reproduce the ASB content, so practitioners must obtain and read the exact revision cited.

7. Erroneous part-number corrections: The Background notes that Amendment 1 “corrects part numbers in paragraph 3.E of the requirement document.” Operators relying on earlier versions or second-hand summaries might have incorrect part number data; accurate part-number matching is essential since applicability is part-number-specific.

8. Cross-jurisdictional references: The AD refers to EASA AD 2006-0078. If an operator is multinational or operates under differing jurisdictions, they must ensure compliance work meets CASA’s AD and that any EASA differences are reconciled. The AD does not spell out equivalence or acceptance of alternative compliance from other authorities.

9. No penalties or enforcement detail in the AD: The AD does not state enforcement mechanisms or penalties for non-compliance. That silence can create uncertainty about administrative consequences, so operators may wrongly assume the AD is advisory unless they confirm CASA’s enforcement posture elsewhere (Penalties and enforcement).

10. Record ambiguity: The AD implies prior work may fulfil current obligations, but it provides no recordkeeping format or proof standard. Operators must ensure traceable maintenance documentation demonstrates compliance with the exact ASB paragraphs and prior Service Bulletins to avoid disputes about whether work was “already accomplished.”

Being alert to these points avoids misapplication, overlooked inventory obligations, and timing misunderstandings. Each “gotcha” stems from the AD’s tight technical specificity, reliance on external documents, and mixed timeline mechanics.

The AD prescribes a clear set of steps as framed by its Requirement, Notes and Compliance sections. The following compliance checklist is derived directly from the AD wording and the referenced ASB paragraphs.

1. Determine applicability

   • Confirm the airframe is Model AS 365 N3 equipped with a quiet fenestron tail rotor.
   • Verify modification status: confirm the helicopter is after incorporation of Modification 0764B39 (Service Bulletin No. 64.00.21) and before incorporation of Modification 0764B48 (Applicability).
   • Verify part numbers: confirm the installed tail rotor hub is part number 365A33-3500-02 or 365A33-3500-03, and blade attachment bushes are part number 365A33-3530-20 (Applicability).
   • If the aircraft does not meet all of the above, the AD, as written, does not apply.

2. Ascertain prior compliance

   • For AS 365 N3 helicopters, confirm prior compliance with AS 365 N Service Bulletins No. 64.00.21 and No. 65.00.14, because ASB No. 64.00.23 Revision 1 requires those prior actions before its work is effective (Requirement, Note 1).
   • Review maintenance records to establish whether Requirement 1 was “already accomplished” prior to the deadlines given.

3. Obtain and follow the exact Eurocopter documents

   • Obtain Eurocopter AS 365 N Alert Service Bulletin No. 64.00.23.2 and Eurocopter ASB No. 64.00.23 Revision 1.
   • Follow the specific installation instructions in ASB No. 64.00.23.2 for installing a tuning weight on each tail rotor blade, and then accomplish paragraph 2.C of ASB No. 64.00.23 Revision 1 as required by the AD (Requirement).

4. Process spares before installation

   • If you hold blade attachment bushes or tail rotor hubs as spares, do not install them unless they have been processed as follows: replace blade attachment bushes in accordance with paragraph 2.B.5 of ASB No. 64.00.23 Revision 1; modify and re-identify tail rotor hubs in accordance with paragraphs 2.B.2 and 2.C of ASB No. 64.00.23 Revision 1 (Requirement).
   • Update spares inventory records to flag any stocks requiring processing prior to installation.

5. Comply with the timing requirements

   • For Requirement 1, if it has not already been accomplished, the AD states completion was required before 30 April 2003. Given the AD notes the compliance time remains unchanged, check historical records to verify whether that work was completed. If records are absent, consider the operational risk and the potential need to carry out the work now even though the date is past.
   • For the second timing requirement, ensure that the work is performed the next time the tail rotor hub is removed, and in any event no later than 31 December 2006. Maintain a maintenance schedule and parts removal log to catch and plan for the hub removal event.

6. Record the work performed

   • Although the AD does not stipulate record formats, maintain clear records demonstrating compliance with the ASB paragraphs cited, including dates, technicians, references to the exact ASB revision, and part numbers installed or modified (the AD’s applicability and spares rules make part-number traceability essential).
   • Document prior Service Bulletins No. 64.00.21 and No. 65.00.14 compliance where relevant.

7. Coordinate with parts suppliers and inventory managers

   • Identify any stock of tail rotor hubs or blade attachment bushes (part numbers specified in the AD) and arrange for their modification and re-identification per the ASB prior to installation.
   • Quarantine or label any spares that are unprocessed to prevent inadvertent installation.

8. Reconcile with EASA and other authorities (if applicable)

   • The AD refers to EASA AD 2006-0078. If your operation spans jurisdictions or you rely on EASA approvals, ensure that the work performed meets both CASA’s AD requirements and any relevant EASA directives.

9. Seek clarification where ambiguity exists

   • If there is uncertainty about whether the aircraft’s modification state or part numbers meet the AD’s applicability criteria, or uncertainty about which ASB revision paragraphs apply, contact CASA or the manufacturer for authoritative guidance. The AD notes that Amendment 1 “clarifies the identification requirements of paragraph 2.C,” but if ambiguity remains, get written confirmation.

10. Plan for operational impacts

• Anticipate aircraft downtime for the installation of tuning weights and any required replacement/modification works when a hub is removed. Schedule the work to minimise operational disruption while meeting the AD’s timeline constraints.

By following these steps , verify applicability, confirm prior Service Bulletin compliance, obtain and implement the exact ASB procedures, process spares before installation, meet the specified timing triggers, and maintain clear records , an operator or maintenance organisation will have implemented the actions mandated by AD/DAUPHIN/63 Amdt 1 as stated in the supplied text.