AD/DAUPHIN/88 - Engine Control Selector Switch Guard

The instrument is brief and built around a small set of concrete, interconnected concepts drawn from the text: applicability, retrofit requirement (method and scope), prohibited parts, compliance timing, and references to manufacturer and EASA material.

• Applicability. The AD is expressly limited to "AS 365 N3 helicopters without MOD 0739C36." That is the primary filter for determining whether an airframe is captured (Applicability). Note 1 expands the population by stating that helicopters with MOD 0739B86 embodied via ASB 76.00.06 or during customisation are included; it also lists serial numbers modified during customisation. The AD therefore uses the presence or absence of discrete modification tags (MOD numbers) and serial‑numbering to define scope.

• Retrofit requirement and method. The substantive safety action is replacement of the "engine control switch guards on panel 12 ALPHA." The AD does not provide a step‑by‑step procedure itself but mandates compliance "with the instructions in paragraphs ... of Eurocopter AS 365 Alert Service Bulletin (ASB) 76.00.08 or later approved EASA revision" (Requirement 1, sub‑paragraphs a and b). The AD therefore delegates procedural detail to the manufacturer's ASB and to EASA for later revisions. The sub‑paragraphs differentiate which paragraphs of the ASB apply depending on the MOD status of the helicopter.

• Prohibition of specific parts. Requirement 2 forbids installation, either as an initial fit or as replacement spare, of selector lifting interlocks bearing any of four specified part numbers (800KU01B6AA, 800KU01D6AA, 801KU01C6AA, 801KU01E6AA). The ban is absolute in terms of installation (initial or spare) after the stated triggering event (Requirement 2).

• Timing. The AD sets clear temporal constraints: Requirement 1 must be done "No later than 550 hours time in service, after the effective date of this Directive, or 26 October 2007, whichever occurs first." Requirement 2 becomes applicable "After the Requirement 1 modification has been accomplished or 26 October 2007, whichever occurs first." The AD itself becomes effective on 26 October 2006. These time references are the principal operational levers.

• Referential instruments. The AD explicitly ties compliance methods to manufacturer and regional authority documents: Eurocopter ASB 76.00.08 or later EASA‑approved revisions and it references EASA AD 2006‑0255 (Note 2). It also references MOD numbers (0739B86, 0739C36) and an earlier Eurocopter service bulletin (ASB 76.00.06) in Note 1.

Conceptually, the AD operates by changing what parts are acceptable for installation and by mandating a retrofit per manufacturer instructions within a specified service‑hour or calendar threshold. It uses modification tags and serial numbers to filter the affected fleet. The AD does not itself describe the technical design of the new interlocks, the operational consequences of the old interlocks' failure mode other than the high‑level hazard ("flipping from FLT to IDLE"), nor does it include enforcement or penalty language within the text provided.

The AD identifies the regulated population narrowly and specifies which entities must act, what decisions they make, and the moments in which behaviour must change.

• Primary parties affected. The immediate addressees are operators and owners of "AS 365 N3 helicopters without MOD 0739C36" (Applicability). Where a helicopter has MOD 0739B86 embodied per ASB 76.00.06 or during customisation, it is included (Note 1), and a list of specific serial numbers modified during customisation is provided. The directive therefore predominantly targets owners and operators of that subset of Eurocopter Dauphin N3 airframes.

• Secondary affected parties. Maintenance organisations, approved engineers, and parts suppliers will be affected because the AD prescribes a retrofit on a specific panel, requires following procedures in a manufacturer alert service bulletin, and forbids installation of particular part numbers as initial or spare parts (Requirement 2). The AD implicitly requires maintenance planners to schedule work within the 550‑hour window or by the date specified, to verify MOD status, to remove prohibited part numbers from stock/use, and to record compliance in maintenance records.

• Who decides. The AD prescribes what must be done but delegates the exact procedure to Eurocopter's ASB 76.00.08 (or later EASA‑approved revisions). That places the tactical decisions about parts, steps, and the technical method with the manufacturer’s service bulletin, and with whoever implements that ASB (approved maintenance organisation, certifying staff). The regulator's role in this document is to mandate compliance and to set time lines; the manufacturer provides the method.

• When behaviour changes. Operators must carry out the retrofit "No later than 550 hours time in service, after the effective date of this Directive, or 26 October 2007, whichever occurs first." The AD becomes effective on 26 October 2006. For the parts ban, the timing is "After the Requirement 1 modification has been accomplished or 26 October 2007, whichever occurs first." Practically, an operator whose aircraft has not yet undergone Requirement 1 must schedule the retrofit within the service‑hour or calendar deadline. Once they have completed Requirement 1, they must ensure that the prohibited part numbers are not fitted as initial installations or spares thereafter.

• Geographic and regulatory scope. The document is an Australian Civil Aviation Safety Authority directive applicable within the jurisdictional reach of the issuer; it cross‑references EASA documentation, making compliance a point where manufacturer, European Aviation Safety Agency materials and CASA's requirement intersect (Note 2). The AD does not state explicit consequences within the text presented, so the manner in which non‑compliance is treated by regulators or by operators is not specified in this document.

• Who pays. The source does not provide cost figures or state who bears the expense. Mechanically, the obligations are placed on operators/owners to carry out the replacement; therefore, they will be the actors responsible for arranging and commissioning the work and for ensuring prohibited parts are not used. Maintenance providers will supply labour and parts under commercial terms, and parts suppliers will be affected by the ban on stocking or supplying the listed part numbers for the affected fleet.

• Parts inventory impacts. The absolute prohibition on specified part numbers "either as an initial installation or as a replacement spare" will require parts managers to reconcile spares inventories against the four part numbers listed and to prevent use of those parts on applicable helicopters after the trigger (Requirement 2). The AD does not provide a transitional allowance for existing spares; it simply states the prohibition.

In short, the AD places operational obligations on AS 365 N3 helicopter operators without MOD 0739C36, reallocates procedural decisions to the manufacturer ASB and EASA, and imposes parts‑use restrictions that affect operators, maintenance organisations and parts suppliers. The source text names specific modification numbers and serial numbers that determine inclusion or exclusion from the AD’s reach.

The directive establishes duties for operators and maintenance personnel; it does not articulate rights or appeal processes within the text provided. The duties are concrete and time‑bounded.

Key duties

• Duty to determine applicability. Operators must determine whether an airframe is an "AS 365 N3 helicopter without MOD 0739C36" or whether it has MOD 0739B86 embodied as noted in Note 1. This initial duty is implied by the Applicability and the tailored instructions that follow depending on MOD status.

• Duty to perform the retrofit. Requirement 1 mandates replacement of the "engine control switch guards on panel 12 ALPHA." The directive prescribes compliance with particular paragraphs of Eurocopter ASB 76.00.08 or a later EASA‑approved revision. The applicable paragraphs differ depending on whether the helicopter is "not modified per MOD 0739B86" or "not modified per MOD 0739C36" (Requirement 1, sub‑paragraphs a and b). The duty includes following the ASB paragraphs specifically listed.

• Duty to avoid specified parts. Requirement 2 prohibits installation, as an initial fit or as a replacement spare, of the four listed selector lifting interlock part numbers (800KU01B6AA, 800KU01D6AA, 801KU01C6AA, 801KU01E6AA). This is framed as an absolute ban for the specified uses.

• Duty to meet deadlines. The directive sets hard triggers for compliance: Requirement 1 must be completed "No later than 550 hours time in service, after the effective date of this Directive, or 26 October 2007, whichever occurs first." Requirement 2 becomes applicable "After the Requirement 1 modification has been accomplished or 26 October 2007, whichever occurs first." The AD's effective date is 26 October 2006.

• Duty to follow referenced documents. The AD makes meeting the ASB instructions a duty; it requires compliance with manufacturer instructions as they appear in Eurocopter ASB 76.00.08 or a later EASA‑approved revision. Operators therefore must procure and follow the current relevant version of the ASB or EASA‑approved revision at the time of work.

Rights and omissions in the text

• The AD text does not enumerate procedural rights, such as the right to seek an exemption, alternative means of compliance, or to appeal. The document likewise does not set out any burden‑sharing of costs. The AD also does not specify penalties, enforcement mechanisms, or the administrative process for documenting compliance, within the text provided.

• The AD does grant a kind of operational latitude by delegating technical steps to the ASB and EASA revisions. The AD does not itself detail how to install the new selector lifting interlocks; instead it requires that operators "comply with the instructions in paragraphs ..." of the ASB or later approved EASA revision. That delegation creates a duty to follow a separate document rather than to comply with prescriptive steps in the AD text itself.

• The AD provides some certainty about timing: the effective date and the two alternative deadlines are clear. The directive also lists MOD numbers and serial numbers for more precise applicability determinations, which reduces ambiguity for operators who check modification tags and serial number lists.

Practical implications of duties

• Maintenance workflow: Operators must plan to ground or allocate maintenance windows to perform the replacement on panel 12 ALPHA within the 550‑hour or calendar deadline.

• Parts management: Operators and parts suppliers must ensure that the listed part numbers are not installed or used as spares on applicable helicopters once Requirement 2 is triggered.

• Technical compliance: The operator must obtain Eurocopter ASB 76.00.08 (or later EASA‑approved revision) and ensure that the correct ASB paragraphs are followed depending on MOD status. The AD compels reliance on manufacturer's instructions for technical conformity.

The directive's text imposes explicit duties but does not enumerate corresponding rights or process‑level protections. The absence of procedural detail in the AD shifts practical implementation responsibilities to operators and maintenance organisations working under the ASB and within the given deadlines.

The AD text supplied does not set out penalties, civil fines, or a specific enforcement procedure. The directive is presented as an Airworthiness Directive signed by a CASA delegate and dated 15 September 2006, with an effective date of 26 October 2006; however, the document itself contains no clauses prescribing sanctioning measures or describing administrative enforcement steps or criminal penalties.

What the source states

• No penalty clause. There is no language in the supplied AD that references penalties, sanctions, enforcement actions, or administrative remedies for non‑compliance. The document focuses on the technical requirement (replacement of selector switch guards), the prohibition of certain part numbers, and the deadlines for those actions.

• Issuance authority. The document is signed by "James Coyne, Delegate of the Civil Aviation Safety Authority" and dated. The signature indicates issuance by an authorised CASA representative. The AD format, content and signature collectively communicate mandatory regulatory instruction; the AD declares an effective date and binding requirements, but do not in this text explain the mechanisms by which CASA will enforce compliance.

Practical enforcement considerations implicit in the instrument

• Regulatory instrument. As an Airworthiness Directive, this document functions as a safety requirement directed at continuing airworthiness. The AD format makes clear the expectation that operators must comply within the defined time frames. Although penalties are not stated, operators should treat the AD as a mandated regulatory action; the text binds operations by setting explicit compliance obligations and deadlines.

• Enforcement channels not specified in text. Because the AD does not describe enforcement mechanisms, the AD’s practical force depends on the broader regulatory framework and enforcement practices external to this document. The AD does reference EASA materials and Eurocopter ASBs; those references suggest this AD is part of a network of safety instruments, but the text does not specify whether CASA will, for example, issue grounding notices, civil penalties, or certificates suspension for non‑compliance.

• Compliance as operational necessity. The AD imposes duties that affect airworthiness configuration and parts usage. Regardless of absent penalty language, failure to complete mandated modifications and to prevent use of prohibited parts will have operational consequences for records, inspections and the continued airworthiness status of affected helicopters; those consequences are not enumerated in the AD text but follow from the practical realities of maintaining an aircraft to an authorised standard.

• Record‑keeping and proof. The AD requires compliance with the ASB procedures; although the AD does not state a record‑keeping standard, operators will need to document the replacement and parts changes to show compliance with the directive if queried. The AD itself does not set the record format.

In sum, the AD imposes mandatory technical duties and time frames but, in the supplied text, does not articulate enforcement mechanisms or penalties. The document’s authority is expressed through the CASA delegate's signature and the binding language of requirements and deadlines. How non‑compliance is treated in practice will depend on CASA’s enforcement regimes and on how airworthiness certification and continuing airworthiness processes are administered outside of this document; those enforcement modalities are not described here.

The AD principally interfaces with manufacturer service instructions and with another aviation safety authority's directive. The source contains explicit references to external instruments and internal modification identifiers, which structure interactions.

Express references in the text

• Manufacturer service bulletin. The AD requires compliance with "Eurocopter AS 365 Alert Service Bulletin (ASB) 76.00.08 or later approved EASA revision" for the replacement procedure (Requirement 1). It also mentions Eurocopter Service Bulletin 76.00.06 in Note 1 as the vehicle by which MOD 0739B86 could have been embodied. These references mean the AD's technical content is implemented by following a manufacturer document, which in turn may be updated by the manufacturer or through EASA approval processes.

• EASA AD cross‑reference. Note 2 states "EASA AD 2006-0255 refers." The AD therefore connects with an EASA airworthiness directive, signalling that the safety concern and the remedial action are addressed in European regulatory documentation as well. The AD ties Australian regulatory obligation to manufacturer and EASA material.

• MOD identifiers and serial numbers. The AD uses internal modification numbers (MOD 0739C36, MOD 0739B86) and specific helicopter serial numbers to define applicability. Those MOD numbers are part of the aircraft's modification history and interface with maintenance records, continuing airworthiness documentation, and type‑certificated configuration lists.

What the source implies but does not state

• Delegation to manufacturer and EASA. By mandating the procedures in an ASB or "later approved EASA revision", the AD creates an interaction where CASA requires adherence to a manufacturer's procedure but accepts EASA‑approved revisions as authoritative. The AD therefore sits at the intersection of CASA regulatory authority, Eurocopter engineering instructions, and EASA certification/approval processes.

• Maintenance and certification paperwork. The AD's applicability relies on modification status (MOD numbers), which are maintained in aircraft records. Determination of whether an aircraft is "without MOD 0739C36" requires inspection of modification tags and records. That links the AD to the regulatory requirements on record keeping and continuing airworthiness, although those other legal obligations are not stated in the AD text.

Limits of the document

• No explicit cross‑statutory references. The supplied AD does not cite specific national statutes, regulations, or enforcement provisions that would ordinarily describe the legal powers of the issuer or the consequences for non‑compliance. The AD instead references manufacturer and EASA materials as the technical standard for compliance.

• No mention of alternative means of compliance. The AD does not describe a process for approving alternative methods of compliance or delegations of authority to accept non‑standard fixes; it strictly requires compliance with the ASB paragraphs listed or EASA‑approved revisions.

In operational terms, operators will need to manage intersections between their aircraft maintenance and modification records, the manufacturer’s ASB, EASA directives, and CASA’s AD. The AD draws its technical requirements from the ASB and a related EASA AD, thereby making those documents part of the binding compliance framework for the affected helicopters under this AD.

The supplied document gives a narrow and explicit record concerning dates, issue identifiers, and cross‑references. It does not include a sequence of prior amendments or subsequent changes inside the text provided.

What the document states about timing and identity

• AD identity and issue label. The directive is titled AD/DAUPHIN/88 and appears twice in the header block; the table header identifies the AD as "AD/DAUPHIN/88 | Engine Control Selector Switch Guard | 11/2006". The repetition of "11/2006" indicates the month and year of the issue labelling in the header.

• Effective and issue dates. The AD includes both a signature date and an effective date. It is signed on "15 September 2006" by a CASA delegate and expressly states "This Airworthiness Directive becomes effective on 26 October 2006." The compliance windows reference 26 October 2007 as a statutory outside date for the requirements.

• Referential amendments. The AD mandates compliance with "Eurocopter AS 365 Alert Service Bulletin (ASB) 76.00.08 or later approved EASA revision." The phrase "or later approved EASA revision" admits that the detailed method of compliance may be updated via EASA‑approved revisions to the ASB. The AD itself does not amend the ASB; it defers to EASA‑approved ASB revisions as acceptable later versions for compliance. That creates a permitted path for later technical revisions to be relied upon without the AD needing formal amendment.

• Notes and serial numbers. Note 1 records that certain helicopters with MOD 0739B86 embodied in accordance with Eurocopter Service Bulletin 76.00.06 or during customisation are included. It lists serial numbers (6510, 6561, 6565, 6568, 6571, 6582, 6585, 6587 and 6596) that were modified during customisation. That is an embedded historical record of which airframes were altered during customisation and how those modifications were effected.

What is not in the supplied text

• No record of prior versions. The document does not present any earlier iterations or prior AD numbers that this supersedes. There is no "amendment" schedule or historical log within the AD itself.

• No record of later amendments. The document does not show whether this AD has been amended, revoked or superseded after issuance. The phrase "or later approved EASA revision" refers to changes in the ASB/EASA domain but is not an amendment to the AD text itself as supplied.

• No revision control metadata. The AD does not include an internal revision number, consolidated amendment record, or explanatory memorandum describing why the AD was issued beyond the short Background statement.

Operational consequence

• For practical purposes, operators must treat the AD as effective from 26 October 2006 and must follow the compliance windows established. Any later changes to the ASB that are EASA‑approved can be relied on for the technical method of compliance as the AD permits "later approved EASA revision" of the ASB, but the AD text itself remains as stated until explicitly amended by CASA elsewhere.

In short, the supplied AD includes an issuance date, an effective date, the AD identifier and references allowing later EASA‑approved ASB revisions to be used for compliance. The text does not include any prior or subsequent amendment history beyond those items.

The supplied AD contains no litigation history, case citations, or references to judicial decisions. The directive is a technical regulatory instrument and the text does not report any past or pending legal challenges, appeals, or court orders related to AD/DAUPHIN/88.

What the source shows

• No cases or appeals listed. There are no judicial citations, no references to administrative appeals, and no mention of proceedings or disputes in the document. The only external legal reference is to "EASA AD 2006‑0255" (Note 2) and to Eurocopter service bulletins; these are safety and manufacturer documents rather than litigation matters.

• Administrative signature only. The AD is issued by a CASA delegate and signed by James Coyne; the signature and date indicate administrative issuance but do not record any litigation or adjudicative history.

Implications of silence

• Absence of recorded litigation in the AD does not imply litigation has or has not occurred outside the document. The directive is not a public record of litigation, and the lack of litigation details within the AD should be read simply as an absence of that content in this instrument.

• For those seeking to understand legal contestability of this directive, this document does not provide procedural or appeal routes, nor does it indicate whether CASA has or has not faced legal challenges over this AD. Any litigation or administrative review would be recorded in separate case files or public registries outside the scope of this AD text.

• Because the AD delegates detailed technical steps to Eurocopter ASB 76.00.08 or later EASA‑approved revisions, any dispute about the technical sufficiency of the remediation might involve the manufacturer, EASA decisions, and CASA administrative procedures; none of that is captured within the AD itself.

Practical note for legal research

• The absence of litigation references means anyone requiring litigation history must consult other sources, such as CASA records, tribunal or court archives, or publisher registries of ADs and associated legal actions. The AD text itself provides no litigation context or known precedent.

In sum, AD/DAUPHIN/88 as supplied contains no litigation history and does not articulate dispute resolution mechanisms or record any judicial or administrative challenges.

The AD is short and focused, but it contains several practical traps and points of possible misinterpretation that operators and maintenance personnel should watch for. These are drawn directly from the source language and the operational implications of the requirements.

1. Applicability depends on MOD identifiers and serial numbers. The AD applies to "AS 365 N3 helicopters without MOD 0739C36" (Applicability). Note 1 clarifies that helicopters with MOD 0739B86 embodied in accordance with Eurocopter Service Bulletin 76.00.06 or during customisation are included and lists specific serial numbers modified during customisation. Operators must check records for MOD 0739C36 and MOD 0739B86, and verify serial numbers where applicable. Failing to verify modification status could lead to incorrectly concluding an aircraft is out of scope.

2. Double negatives in sub‑paragraphs create potential confusion. Requirement 1 uses the phrasing "Helicopters not modified per MOD 0739B86" and "Helicopters not modified per MOD 0739C36" to determine which ASB paragraphs apply. Read these carefully: if an aircraft has been modified per MOD 0739B86, it falls outside the first sub‑category (and the specified ASB paragraphs for that sub‑category would not apply). Conversely, if it has not been modified per MOD 0739C36, then sub‑paragraph (b) applies. Misreading these negatives could result in following the wrong ASB paragraphs.

3. Different ASB paragraphs apply depending on modification status. The AD does not give a unified procedure: it prescribes different sets of paragraphs from ASB 76.00.08 depending on MOD status. Ensure you obtain the ASB and follow the exact paragraphs listed: 2.B.1, 2.B.2, 2.B.3, 2.B.4 and 2.B.5 for the first group; 2.B.1, 2.B.3 and 2.B.5 for the second. Omitting a paragraph while assuming equivalence may result in incomplete compliance.

4. Comparative triggers: hours vs calendar date. Requirement 1 must be completed "No later than 550 hours time in service, after the effective date ... or 26 October 2007, whichever occurs first." That creates two different kinds of trigger: an operational one tied to aircraft utilisation, and a calendar cut‑off. High‑utilisation operators might reach 550 hours quickly; low‑utilisation operators could rely on the calendar date. Missing either trigger is failing to comply.

5. Timing of the prohibition on part numbers. Requirement 2 prohibits installation of the listed selector lifting interlocks "After the Requirement 1 modification has been accomplished or 26 October 2007, whichever occurs first." That phrasing means the parts ban becomes operative either when an individual aircraft completes Requirement 1, or by 26 October 2007 whether or not Requirement 1 has been done. This has inventory implications: spares with the prohibited part numbers must not be fitted to affected helicopters after the triggering event even if they were on hand prior to the AD.

6. Absolute prohibition on listed part numbers. Requirement 2 states the four part numbers "may not be installed either as an initial installation or as a replacement spare." The AD contains no transitional carve‑out for existing installations or existing spares. The absence of an express grandfathering provision means operators should treat the prohibition as immediate upon the triggering condition. Verify spares inventories and parts ordering procedures to prevent accidental fitting.

7. Reliance on external documents. The AD mandates compliance with Eurocopter ASB 76.00.08 or "later approved EASA revision." That creates an obligation to obtain the correct ASB version and any later EASA‑approved revisions. Failure to obtain the correct version or to confirm EASA approval of a later revision may cause compliance disputes. Also, because the AD does not reproduce the ASB instructions, reliance on the ASB is necessary to complete the AD's required work.

8. No enforcement language in the AD text. The AD contains no explicit penalties or compliance documentation instructions. Do not interpret silence as absence of compliance obligations; the AD still imposes mandatory technical duties and time lines. Operators should proactively document compliance and maintain records of parts disposition even though the AD itself does not prescribe record‑keeping formats.

9. Cross‑reference to EASA AD 2006‑0255. Note 2 states "EASA AD 2006‑0255 refers." Operators that maintain global fleets or that source parts or procedures from Europe should check the referenced EASA AD for additional technical detail or requirements that may affect compliance.

10. Panel and part specificity. The AD specifies the location "panel 12 ALPHA" for the replacement. Maintenance work must be directed to that precise panel and parts must be compatible with the panel configuration as described in the ASB. Fitting a different interlock or installing at a different location is not authorised by the AD text.

These "gotchas" derive directly from the AD's specific wording and the operational requirements it creates. Careful attention to MOD status, serial numbers, the ASB paragraphs referenced, the two kinds of compliance triggers, and the absolute part ban are the principal risk points where misinterpretation or administrative oversight could lead to non‑compliance.

This section sets out a practical, source‑grounded checklist of steps operators and maintenance organisations should follow to meet the AD’s requirements, based solely on the text provided.

1. Establish applicability for each airframe.

   • Check airframe type: confirm the helicopter is an "AS 365 N3" (Applicability).
   • Check modification records: determine whether MOD 0739C36 has been embodied. If MOD 0739C36 is present, the AD’s applicability excludes that airframe; if absent, the AD applies.
   • Check for MOD 0739B86: Note 1 indicates helicopters with MOD 0739B86 embodied in accordance with Eurocopter Service Bulletin 76.00.06 are included; the note also lists specific serial numbers that were modified during customisation. Verify whether the aircraft serial number appears among those listed (6510, 6561, 6565, 6568, 6571, 6582, 6585, 6587, 6596) or whether MOD 0739B86 is recorded elsewhere.

2. Obtain the required technical documentation.

   • Obtain Eurocopter AS 365 Alert Service Bulletin 76.00.08 and any EASA‑approved revisions available at the time of work, because the AD requires compliance "with the instructions in paragraphs ..." of that ASB or a later EASA‑approved revision (Requirement 1).
   • Identify which ASB paragraphs apply based on the aircraft’s MOD status:
     • If the helicopter is "not modified per MOD 0739B86," follow ASB paragraphs 2.B.1, 2.B.2, 2.B.3, 2.B.4 and 2.B.5.
     • If the helicopter is "not modified per MOD 0739C36," follow ASB paragraphs 2.B.1, 2.B.3 and 2.B.5.
   • Confirm whether any EASA AD relevant to this ASB (EASA AD 2006‑0255) contains additional instructions or clarifications (Note 2).

3. Plan and schedule the modification.

   • Schedule the replacement of the "engine control switch guards on panel 12 ALPHA" in accordance with the ASB instructions.
   • Ensure the work will be completed "No later than 550 hours time in service, after the effective date of this Directive, or 26 October 2007, whichever occurs first" (Compliance for Requirement 1). Use aircraft logbooks to determine the 550‑hour window from the AD’s effective date (26 October 2006).
   • Coordinate with an approved maintenance organisation or appropriately qualified personnel to perform the ASB procedures and certify the work.

4. Manage parts and spares inventory.

   • Identify any selector lifting interlocks in stock bearing the prohibited part numbers: 800KU01B6AA, 800KU01D6AA, 801KU01C6AA, 801KU01E6AA (Requirement 2).
   • Ensure these parts "may not be installed either as an initial installation or as a replacement spare" after the trigger (Requirement 2): after Requirement 1 has been accomplished for the aircraft in question or by 26 October 2007, whichever occurs first.
   • Remove or quarantine prohibited parts from inventory for affected helicopter types to prevent accidental installation. The AD does not provide a process for disposition; document decisions and actions taken.

5. Execute the modification per the ASB.

   • Perform the replacement steps exactly as set out in the ASB paragraphs identified for the helicopter’s MOD status.
   • Confirm the replacement location is "panel 12 ALPHA" as specified in the AD text.
   • Install the new selector lifting interlocks with locking detents as stated in the AD Background.

6. Documentation and records.

   • Record the AD compliance action in the helicopter’s maintenance records, including date of work, service hours at the time of the modification, parts installed (including part numbers of new interlocks), and reference to the ASB revision relied upon.
   • Document the disposition of any prohibited parts removed or quarantined from service or stock.

7. Timing interplay for part prohibition.

   • Be mindful that Requirement 2’s prohibition on specified part numbers becomes operative "After the Requirement 1 modification has been accomplished or 26 October 2007, whichever occurs first." If the aircraft owner completes Requirement 1 early, ensure prohibited parts are not fitted to that aircraft or subsequent aircraft after completion.

8. Cross‑check with EASA AD 2006‑0255.

   • Review the referenced EASA AD to confirm there are no additional obligations or clarifications relevant to the ASB or to parts usage. The AD notes "EASA AD 2006‑0255 refers" (Note 2), which suggests EASA’s document contains relevant material.

9. Verify final conformity.

   • After completion, verify the installed interlocks match the configuration required by the ASB and that no prohibited parts are present.
   • Maintain evidence that the installation followed the ASB paragraphs specified and list the ASB revision relied upon.

10. Organisational process updates.

• Update maintenance procedures, parts ordering practices, and spares management processes to prevent procurement or use of the prohibited part numbers for affected helicopters.
• Train maintenance staff and parts personnel on the MOD‑based applicability and on the specific ASB paragraphs to be used for compliance.

This is a compliance pathway derived directly from the AD’s text. The AD delegates detailed technical steps to the Eurocopter ASB and to EASA‑approved revisions, so implementation requires obtaining and following those documents in addition to applying the steps above. The AD’s timing requirements and the absolute prohibition on the listed part numbers are the critical constraints to observe.