AD/BEECH 56/35 - Circuit Breaker Toggle Switches

Applicability. The Directive’s scope is narrowly framed by its Applicability and Table 1. It applies only to the aeroplane model A56TC with serial numbers TG-84 through TG-94 where any circuit breaker toggle switch bearing part numbers (P/N) 35-380132-1 through 35-380132-53 is installed (Applicability; Table 1). Although the FAA background refers to a wider set of Beech models that have experienced overheating reports (Background), CASA’s Directive confines mandatory action to the listed A56TC serial number range.

Mandatory replacement. The core regulatory requirement is replacement of the older family of circuit breaker toggle switches (P/N 35-380132-1 through -53) with an "improved" family (P/N 35-380132-61 through -113) in accordance with the specified manufacturer service bulletin (Requirement 1). The Directive explicitly conditions the requirement on non-duplication where the work has "Unless previously accomplished" been performed, i.e. prior accomplishment is accepted as compliance (Requirement 1; Directive commentary).

Installation prohibition. The Directive institutes a prophylactic ban: those older part numbers "may not be installed on any aeroplane as an initial fit or as a replacement spare" (Requirement 2). That prohibition applies to the mechanic fitting parts as well as to the parts supply environment for these aeroplanes, in the sense that initial fits and replacement spares for the affected aeroplanes must not be of the old P/Ns.

Method of compliance. The Directive points to Raytheon Aircraft Company Recommended Service Bulletin SB 24-3735, Issued: August 2005, as the specified method for carrying out the replacement (Requirement 1). It also accepts "later revisions of the above SB, approved by the United States Federal Aviation Administration (FAA) as an Alternate Method of Compliance (AMOC) to FAA AD 2008-13-17" as acceptable for compliance with the equivalent Requirements of this Directive. Therefore, an FAA-approved SB revision functions as an AMOC and is deemed compliant with CASA’s Directive (AMOC acceptance).

Timing and effective date. The Directive is effective on 25 September 2008. Requirement 1 must be complied with "within the next 24 months after the effective date of this Directive" (Compliance). The document explicitly notes that CASA has extended the compliance deadline by 13 months (to 25 September 2010) compared with the FAA AD’s final compliance date (6 August 2009) (Directive commentary on FAA compliance time).

Safety justification. The background paragraph records that the FAA received reports of overheating of certain circuit breaker toggle switches in multiple Beech models, and that failure "could result in smoke in the cockpit and the inability to turn off the switch" (Background). This is presented as the operational safety risk that underpins the replacement and prohibition requirements.

Administrative process. The Directive records that a draft was posted for public comment on the CASA internet site on 9 July 2008 and that, "As of the date that this Directive was made, no comments or objections have been received by CASA" (Directive commentary). The instrument is signed by James Coyne, Delegate of the Civil Aviation Safety Authority, dated 8 August 2008.

Document cross-reference. The Directive explicitly refers readers to FAA AD 2008-13-17 Amdt 39-15580 (Note) and uses the RAC service bulletin SB 24-3735 (Aug 2005) as the technical template for replacement. Those external documents are therefore integral to the Directive’s procedural and technical compliance pathway.

Owners and operators of the affected aeroplanes. The primary economic and practical burden falls on the registered owners and operators of Beech A56TC aeroplanes with serial numbers TG-84 through TG-94 that currently have any circuit breaker toggle switches P/N 35-380132-1 through 35-380132-53 installed (Applicability; Table 1). The Directive places a direct duty on those aeroplane owners/operators to ensure compliance within the specified time window, unless they can establish that the replacement has already been accomplished (Requirement 1).

Maintenance organisations and engineers. Approved maintenance organisations, licensed aircraft maintenance engineers and anyone performing work that constitutes the replacement must carry out the work "as specified in Raytheon Aircraft Company (RAC) Recommended Service Bulletin SB 24-3735, Issued: August 2005" or under a later FAA-approved revision (Requirement 1; AMOC acceptance). Those organisations will also be responsible for confirming part numbers during inspection, installing the authorised replacement P/Ns (35-380132-61 through -113) and ensuring no prohibited P/Ns are installed as initial fits or replacement spares (Requirement 2).

Parts suppliers and spare inventory managers. Suppliers, stock controllers and parts logistics personnel who service the affected aeroplanes or maintenance organisations must ensure that the older P/Ns 35-380132-1 through -53 are not supplied as initial fits or replacement spares for these aeroplanes (Requirement 2). The Directive’s prohibition thus imposes an inventory and procurement constraint on supply chains serving those aircraft.

Aircraft registries and compliance officers. CASA’s instrument will be of direct relevance to national registry compliance officers and to internal compliance officers in operators’ organisations who must note the effective date (25 September 2008) and the 24-month compliance window that concludes on 25 September 2010, reflecting CASA’s extension (Compliance; effective date; Directive commentary).

Design approval and certification authorities. The FAA is explicitly referenced as the approving authority for alternate methods of compliance. The Directive accepts later revisions of the RAC SB if "approved by the United States Federal Aviation Administration (FAA) as an Alternate Method of Compliance (AMOC) to FAA AD 2008-13-17" (AMOC acceptance). That means the FAA’s certification activity affects which technical variants of the SB are acceptable for CASA compliance purposes.

Stakeholders not directly covered. Although the FAA background mentions overheating reports across a broader set of Beech models and serials, the Directive is limited in applicability to the specified A56TC serial range. Owners and operators of other Beech models are not within the stated scope of this CASA Directive; the broader FAA AD is the referenced instrument for broader FAA coverage (Background; Note referring to FAA AD 2008-13-17).

The public comment record. The document records that a draft version of the Directive was posted for public comment on the CASA website on 9 July 2008 and that "no comments or objections have been received by CASA" as of the date the Directive was made (Directive commentary). That fact is relevant to regulatory procedure but does not expand or change the Directive’s substantive obligations.

Mandatory duties.

• Replace specified parts: Owners/operators of the aeroplanes listed in Table 1 that have circuit breaker toggle switches with P/Ns 35-380132-1 through -53 installed must, unless previously accomplished, replace them with improved switches P/N 35-380132-61 through -113 in accordance with RAC SB 24-3735 (Requirement 1; SB reference).

• Do not install older P/Ns: The older P/Ns 35-380132-1 through -53 "may not be installed on any aeroplane as an initial fit or as a replacement spare" (Requirement 2). That is an affirmative prohibition on fitting those parts as initial installations or as replacement spares on the affected aeroplanes.

• Comply to timing: For Requirement 1, the replacement must be completed "Within the next 24 months after the effective date of this Directive" (Compliance). The effective date is explicitly 25 September 2008; the record in the Directive states that CASA extended compliance by 13 months until 25 September 2010 (effective date; Directive commentary). For Requirement 2 the compliance timing is "Before further flight after the circuit breaker toggle switch has been replaced in accordance with Requirement 1" (Compliance for Requirement 2).

Rights, options and procedural elements.

• Prior accomplishment accepted: The Directive explicitly allows prior accomplishment to satisfy Requirement 1, with the phrase "Unless previously accomplished" (Requirement 1). That means owners/operators who replaced the affected P/Ns in accordance with the RAC SB prior to the Directive’s effective date do not need to repeat the work.

• Alternate compliance route via FAA AMOC and later SB revisions: The Directive allows compliance by following later revisions of RAC SB 24-3735, provided those later revisions are "approved by the United States Federal Aviation Administration (FAA) as an Alternate Method of Compliance (AMOC) to FAA AD 2008-13-17" (AMOC acceptance). That provides a technical flexibility channel: if a subsequent service bulletin revision is FAA-AMOC-approved relative to the FAA AD it will be accepted for compliance with this Directive.

• Technical documentation reference: Operators have the right to rely on the identified RAC SB 24-3735 (Issued: August 2005) as the specified technical instruction for the replace­ment (Requirement 1). The Directive also cites FAA AD 2008-13-17 as a related instrument (Note).

Duties not detailed in the Directive. The Directive does not itself include detailed administrative duties such as recordkeeping format, where to lodge compliance evidence with CASA, or the process for notification after compliance. It does not specify inspection intervals beyond the replacement timeline, nor does it stipulate obligations relating to disposal of removed parts. Those administrative and documentary duties, if any, will follow from CASA’s broader regulatory framework and operator maintenance regulations, but they are not specified in the text of the Directive provided.

Who decides. The Directive is issued by CASA (signed by James Coyne, Delegate of the Civil Aviation Safety Authority). The FAA is the approving authority where later revisions of RAC SB 24-3735 are concerned, because those later revisions must be "approved by the United States Federal Aviation Administration (FAA) as an Alternate Method of Compliance (AMOC) to FAA AD 2008-13-17" to be acceptable for CASA compliance (AMOC acceptance). Thus CASA sets the direct mandatory requirement; the FAA controls which later SB revisions will be accepted as an AMOC.

Consequences of non-compliance. The Directive text does not set out specific sanctions or penalties for non-compliance in the body of the instrument. The obligation is stated as a mandatory safety requirement with compliance deadlines, but the instrument itself does not specify enforcement mechanisms or penalty amounts.

The Directive text supplied does not set out explicit civil or criminal penalties, infringement notices, or a specific enforcement regime in monetary or sanction terms. The instrument states the mandatory safety actions, the applicable aeroplane serial numbers and P/Ns, the technical compliance method (RAC SB 24-3735), the effective date (25 September 2008) and the compliance windows (24 months for Requirement 1; a before-further-flight phrase for Requirement 2), but it does not include statutory penalty provisions or describe the administrative enforcement steps that CASA will take in case of non-compliance.

Issuer and authority. The Directive is issued by the Civil Aviation Safety Authority (CASA), signed by James Coyne, Delegate of CASA, dated 8 August 2008 (signature block). In the Australian aviation regulatory architecture CASA issues Airworthiness Directives under its powers; however, this document itself does not recite the statutory provision used to make it or the administrative process for enforcement. The Directive does refer to FAA AD 2008-13-17 and to the RAC service bulletin for technical detail, but enforcement specifics are absent from the instrument content provided.

Practical enforcement implications (textually supported). Where a mandatory airworthiness requirement exists, operators are required to comply within the stated timeframes. The Directive gives an effective date of 25 September 2008 and a compliance schedule: Requirement 1 within 24 months and Requirement 2 before further flight after replacement (Compliance). Although the Directive does not specify penalties, the practical implication is that aircraft subject to the Directive should not be flown non-compliant with the stated requirements; the Directive’s purpose is to ensure the aeroplane meets continuing airworthiness standards. The instrument’s lack of explicit penalties means that the specific enforcement steps, notices or sanctions would derive from CASA’s general enforcement powers and regulatory processes, which are not stated in the Directive itself.

Record of consultation. The Directive notes that a draft was posted for public comment on the CASA internet site on 9 July 2008 and records "no comments or objections have been received by CASA" as of the date the Directive was made (Directive commentary). That procedural note is relevant if one seeks to challenge procedural fairness or sufficiency of consultation, but the Directive contains no record of enforcement outcomes or penalty cases.

AMOC and compliance acceptance. The Directive accepts later RAC SB revisions provided they are FAA AMOCs to FAA AD 2008-13-17 (AMOC acceptance). This is an enforcement-adjacent mechanism: an FAA-approved alternate method of compliance will be treated as compliant for CASA purposes, reducing the risk of enforcement action where an operator follows an FAA-AMOC authorisation.

In short: the Directive imposes specific mandatory airworthiness actions and deadlines, but does not itself set out fines, penalties or concrete enforcement procedures in the text supplied. Enforcement and sanction mechanisms, if invoked, would arise under CASA’s general regulatory powers and administrative practice rather than from specific penalty clauses inside this Directive.

Reference to FAA AD. The Directive explicitly notes its relationship to the United States FAA airworthiness action: "Note: FAA AD 2008-13-17 Amdt 39-15580 refers." The Directive also records that it follows the intent of the FAA Directive but is revised in two respects: it allows prior accomplishment and it extends compliance by 13 months until 25 September 2010, whereas the FAA’s final compliance time was 6 August 2009 (Directive commentary). Therefore, the CASA Directive is positioned as an Australia-specific instrument that takes the FAA AD as its technical and safety reference but sets a distinct compliance timetable and allowance for pre-existing compliance.

Service bulletin as primary technical document. The Directive requires compliance "as specified in Raytheon Aircraft Company (RAC) Recommended Service Bulletin SB 24-3735, Issued: August 2005" (Requirement 1). That means the RAC SB provides the technical method to achieve compliance and is incorporated by reference as the procedural mechanism. For legal and compliance purposes the RAC SB therefore functions as a normative technical standard that the Directive mandates be followed, unless a later FAA-approved SB revision is used as an AMOC.

AMOC mechanism and cross-jurisdictional acceptance. The Directive permits later revisions of the RAC SB "approved by the United States Federal Aviation Administration (FAA) as an Alternate Method of Compliance (AMOC) to FAA AD 2008-13-17" to be "considered acceptable for compliance with the equivalent Requirements of this Directive" (AMOC acceptance). Practically, that creates a cross-jurisdictional compliance pathway in which FAA approval of an alternate technical approach will be accepted by CASA for the purposes of this Directive. It ties CASA’s acceptance to FAA’s AMOC determinations for the related FAA AD.

Regulatory process and consultation. The Directive records that a draft was posted for public comment on CASA’s internet site on 9 July 2008 and that no comments were received as of the date the Directive was made (Directive commentary). That procedural detail indicates adherence to CASA’s public consultation processes for directives, but the document does not reference broader statutes or administrative law provisions governing rulemaking or appeals.

Interaction with maintenance and continuing airworthiness rules. Although the Directive does not recite the broader legislative instruments under which CASA operates, in practice Airworthiness Directives are part of the continuing airworthiness framework that interacts with maintenance standards, approved maintenance organisation obligations and airworthiness certification requirements. The Directive’s requirement to replace specified parts per a service bulletin necessarily interacts with an operator’s continuing airworthiness obligations and maintenance schedules, but the Directive itself does not specify those overarching statutory provisions.

No explicit conflict resolution language. The Directive does not contain express conflict-of-laws clauses or instructions on how to resolve inconsistencies between CASA requirements and other domestic legal obligations. It does, however, create an avenue for acceptance of FAA-approved AMOCs, signalling that where FAA provides an approved alternate technical method for the corresponding FAA AD, CASA will accept it for compliance with the CASA Directive.

In sum: the Directive is technically and procedurally linked to FAA AD 2008-13-17 and RAC SB 24-3735. It sets an Australia-specific compliance timetable and allows acceptance of FAA-approved AMOCs. The instrument does not set out interactions with domestic statutory penalty regimes or the detailed maintenance regulation framework within its text.

Service bulletin origin and prior action. The Directive relies on Raytheon Aircraft Company (RAC) Recommended Service Bulletin SB 24-3735, Issued: August 2005, as the stated method for replacement of the older circuit breaker toggle switches (Requirement 1; SB reference). The Directive explicitly recognises that the RAC service bulletin was issued in 2005 and that the required work may have already been performed prior to CASA’s Directive, which is why prior accomplishment is accepted ("Unless previously accomplished") (Requirement 1; Directive commentary).

Draft and publication timeline. CASA posted a draft version of the Directive for public comment on its internet site on 9 July 2008 and records that, as of the date the Directive was made, "no comments or objections have been received by CASA" (Directive commentary). The Directive itself is dated 8 August 2008 (signed by James Coyne, Delegate of the Civil Aviation Safety Authority) and records an effective date of 25 September 2008 (signature block; effective date).

Change from FAA schedule. The Directive’s commentary states that it "follows the intent of the FAA Directive, requiring the replacement of circuit breaker toggle switches with a P/N 35-380132-1 through 35-380132-53." The CASA Directive is "revised to allow prior accomplishment" and "also extends compliance by 13 months until 25 September 2010," noting that "the final compliance time required by the FAA was 6 August 2009" (Directive commentary). Thus the amendment history relative to the FAA AD is: FAA AD set an earlier deadline (6 Aug 2009), CASA set an effective date of 25 Sep 2008 and a 24-month compliance window ending 25 Sep 2010. The CASA instrument therefore constitutes a deliberate change in timing relative to the FAA AD.

AMOC and later SB revisions. The Directive allows for later revisions of RAC SB 24-3735 to be used for compliance if they are "approved by the United States Federal Aviation Administration (FAA) as an Alternate Method of Compliance (AMOC) to FAA AD 2008-13-17" (AMOC acceptance). That clause anticipates subsequent technical amendments to the RAC SB and provides a mechanism to accept them upon FAA approval, without requiring a fresh CASA Directive for each technical revision.

No recorded subsequent CASA amendments in the text. The supplied document does not record any subsequent CASA amendments or revocations of the Directive itself. It sets the effective date (25 September 2008) and the compliance windows, and it accepts prior accomplishment. No later CASA-issued modification, extension beyond the 24-month window, or revocation is recorded in the text provided.

Administrative sign-off. The Directive is signed by James Coyne as Delegate of CASA on 8 August 2008. That signature block and date appear in the instrument and provide the administrative provenance for the Directive as issued.

Summary timeline (in-document):

• RAC SB issued: August 2005 (SB 24-3735).
• Draft CASA Directive posted for comment: 9 July 2008 (Directive commentary).
• CASA Directive signed: 8 August 2008 (signature).
• CASA Directive effective date: 25 September 2008 (effective date).
• CASA compliance window (Requirement 1): within 24 months of effective date, i.e. by 25 September 2010 (Compliance; Directive commentary).
• FAA AD referenced final compliance time: 6 August 2009 (Directive commentary referencing FAA schedule).

The Directive thus records the service bulletin origin, the CASA drafting and consultation dates, the effective date and the specific scheduling divergence from the FAA AD.

The text of the Directive contains no information about litigation, court challenges, injunctions or enforcement proceedings arising from this instrument. The Directive records that a draft was posted for public comment on the CASA internet site on 9 July 2008 and that "no comments or objections have been received by CASA" as of the date the Directive was made (Directive commentary). That public record of no objections does not constitute litigation history.

Because the supplied document does not reference any judicial review, administrative appeal or litigation arising from the Directive, there is no litigation history to report from the text provided. Any subsequent disputes or court proceedings, if they exist, are not recorded in this document and would have to be located in external records. The Directive itself is silent on appeal pathways or procedural remedies specific to this instrument; it simply sets out the mandatory technical actions, timing and the service bulletin reference.

Practically, the absence of litigation references in the Directive means a researcher seeking litigation history must consult tribunal or court databases, CASA enforcement records, and possible operator or industry litigation archives; none of those sources are included within this Directive text. The only administrative procedural datum recorded is the public consultation posting date and the discrete note that no comments were received.

Narrow applicability , do not over-apply. The Directive’s applicability is tightly specified: A56TC model, serial TG-84 through TG-94, and only where any circuit breaker toggle switch with P/N 35-380132-1 through -53 is installed (Applicability; Table 1). The FAA background lists many Beech models where overheating was reported, but CASA’s Directive is limited to that narrow serial range. A common compliance error would be to assume the Directive applies to the broader fleet referenced in the FAA background; it does not, as written.

Part-number precision matters. The Directive is explicit about exact part number ranges. Older parts are P/N 35-380132-1 through 35-380132-53; approved replacements are P/N 35-380132-61 through 35-380132-113 (Requirement 1). Small transcription or inventory errors in part numbers will determine whether an aircraft is in compliance. Ensure maintenance records and parts labels are checked against these exact P/N ranges rather than approximations.

Prior accomplishment accepted, but must be demonstrable. The phrase "Unless previously accomplished" allows prior replacement to satisfy Requirement 1 (Requirement 1). However, the Directive does not describe procedural evidence required to demonstrate prior accomplishment. Practitioners should expect to rely on maintenance entries, signed logbooks, or equivalent documentation, but the Directive itself does not prescribe the documentary standard required by CASA.

Timing oddity on Requirement 2. The compliance timing for Requirement 2 is phrased as "Before further flight after the circuit breaker toggle switch has been replaced in accordance with Requirement 1" (Compliance for Requirement 2). That wording can be read in different ways; the literal reading supplied is that the prohibition on installing old P/Ns applies before further flight after replacement. In practice, the prohibition is meant to be an immediate ban on installing older P/Ns as initial fits or replacement spares. Readers should not treat the Requirement 2 compliance window as providing a route to temporary use of the older P/Ns pending replacement without further clarification; the Directive’s text as printed is prescriptive and should be followed literally: do not install the old P/Ns as initial fit or replacement spare.

AMOC dependency. The Directive accepts later revisions of RAC SB 24-3735 only if they are "approved by the United States Federal Aviation Administration (FAA) as an Alternate Method of Compliance (AMOC) to FAA AD 2008-13-17" (AMOC acceptance). That means if a maintenance organisation plans to rely on a later RAC SB revision, it must confirm that the FAA has approved that revision as an AMOC to the FAA AD; CASA acceptance is conditional on that FAA approval. Do not assume that a later RAC SB revision is automatically acceptable to CASA without an FAA AMOC.

No penalty detail in instrument. The Directive does not provide enforcement penalty amounts or administrative procedure in the text provided. If parties need clarity on penalty exposure for non-compliance, they must consult CASA’s broader enforcement instruments and legislative framework, because the Directive itself does not spell out sanctions.

Supply-chain and spare-part management not addressed. The Directive prohibits installation of older P/Ns as initial fits or replacement spares, but it does not address availability, replacement-part procurement lead-times, or transitional supply arrangements. Operators with affected aircraft should not assume the Directive solves supply issues and should check part availability proactively. The Directive itself is silent on provisioning, logistics or cost recovery.

Recordkeeping and proof of compliance not specified. The Directive identifies the technical method and timing but does not set out the recordkeeping format or a required CASA filing for proof of compliance. Practitioners should ensure that maintenance records clearly document replacement work, reference the RAC SB or AMOC relied upon, and preserve entries that substantiate prior accomplishment if relied upon.

Effective date and compliance calculation. The effective date is 25 September 2008 and Requirement 1 is within 24 months of that effective date , i.e. compliance by 25 September 2010 , as the Directive records that CASA extended the timeline by 13 months beyond the FAA requirement (effective date; Directive commentary). Confirm exact calendar calculations and do not assume FAA dates apply domestically for CASA compliance.

Identify affected aeroplanes and parts. First, confirm whether the operator’s aeroplane is within the Directive’s Applicability: model A56TC with serial number in the range TG-84 through TG-94 (Table 1). For each aircraft in that scope, inspect installed circuit breaker toggle switches to determine whether any have P/N 35-380132-1 through 35-380132-53 (Applicability; Table 1). This verification is the primary compliance trigger because the Directive applies only when those older P/Ns are present.

Rely on the specified service bulletin for the technical method. Requirement 1 mandates replacement "as specified in Raytheon Aircraft Company (RAC) Recommended Service Bulletin SB 24-3735, Issued: August 2005" (Requirement 1). Use that SB as the procedural and parts reference when planning and performing the replacement. If relying on a later revision of the RAC SB, confirm that the later revision is "approved by the United States Federal Aviation Administration (FAA) as an Alternate Method of Compliance (AMOC) to FAA AD 2008-13-17" before treating that later SB revision as acceptable for compliance (AMOC acceptance).

Schedule work to meet the CASA compliance window. Requirement 1 must be complied with "Within the next 24 months after the effective date of this Directive" (Compliance). The Directive sets the effective date as 25 September 2008; CASA’s commentary confirms that the compliance deadline was extended to 25 September 2010. Plan the maintenance schedule to complete the replacements within that calendar window. Do not rely on the FAA AD timetable; CASA’s Directive sets the domestic timing and explicitly extends the FAA timeframe by 13 months (Directive commentary).

Document prior accomplishment if applicable. If the replacement work was done before the Directive’s effective date, the operator can rely on "Unless previously accomplished" language to claim compliance (Requirement 1). However, the Directive does not specify what documentation is required to prove prior accomplishment. To avoid disputes, capture contemporaneous maintenance entries that reference RAC SB 24-3735 (or the FAA AMOC-approved alternate) and specify the P/Ns removed and installed, technician signatures, workshop approvals and any certification blocks required by the operator’s continuing airworthiness procedures.

Avoid installing prohibited parts. Requirement 2 is an explicit prohibition: "Circuit breaker toggle switches P/N 35-380132-1 through 35-380132-53 may not be installed on any aeroplane as an initial fit or as a replacement spare" (Requirement 2). Ensure that procurement, stores and maintenance teams are instructed not to fit those P/Ns to the affected aeroplanes either as initial installations or as replacement spares. Update spare-parts inventories, MRO purchasing rules and technical orders to reflect the prohibition.

Use FAA-approved AMOCs where applicable. If an operator wishes to use a later RAC SB revision or a different means of compliance, ensure that the FAA has approved that revision as an AMOC to FAA AD 2008-13-17. Only where that FAA AMOC exists will CASA accept the later SB revision "for compliance with the equivalent Requirements of this Directive" (AMOC acceptance). Maintain the FAA AMOC documentation with the maintenance record for the aircraft.

Practical recordkeeping. Although the Directive does not prescribe a format, good compliance practice is to create or amend the aircraft’s maintenance logbook entry to include:

• Aircraft model and serial number and the Directive reference AD/BEECH 56/35 (as the document identifies).
• Date of compliance and who performed the work (organisation and technician).
• Part numbers removed and installed (old P/N and new P/N).
• Reference to RAC SB 24-3735 (include edition/date) or to the FAA-AMOC that is being relied on.
• Certification statement signed by the authorised person that the work conforms to the specified SB or AMOC.
• Cross-reference to invoices, parts receipts and batch numbers for new parts.

Coordinate with parts suppliers and MROs. Ensure the MRO or workshop has access to P/N 35-380132-61 through -113 replacement stock or an order plan that will meet the compliance date. Instruct parts suppliers that P/N 35-380132-1 through -53 are not to be used as initial fits or replacement spares for the affected A56TC serials.

Confirm technical compatibility and serial-specific applicability. The Directive applies only to a subset of A56TC serial numbers. Prior to scheduling replacement, confirm that the aeroplane serial number falls within TG-84 through TG-94. If an affected part is found on an aeroplane outside that serial range, the Directive does not mandate replacement for that aeroplane under the text provided; operators should consult CASA or the relevant FAA AD for guidance on other serial numbers.

Retain evidence for audit and regulatory inquiries. Because the Directive does not detail the required proof standards, retain original maintenance records, parts receipts and any correspondence with CASA or FAA that supports the compliance claim. This is particularly important if prior accomplishment is invoked or if an FAA AMOC is relied upon.

If in doubt, seek CASA clarification. The Directive accepts FAA AMOCs and references the FAA AD. If an operator considers using a variant replacement method, or if parts availability or other operational constraints create ambiguity, seek clarification from CASA, particularly because the Directive’s text does not prescribe administrative procedures for proof of compliance, nor does it set out enforcement steps.

Summary compliance checklist:

1. Verify aircraft model and serial number against Table 1.
2. Inspect installed circuit breaker toggle switches for P/N 35-380132-1 through -53.
3. If any such P/Ns are installed, schedule replacement with P/N 35-380132-61 through -113 per RAC SB 24-3735 (Aug 2005) within CASA’s 24-month window (by 25 Sep 2010).
4. If relying on a later RAC SB revision, confirm FAA approval of that revision as an AMOC to FAA AD 2008-13-17 and retain the AMOC documentation.
5. Ensure no installation of P/N 35-380132-1 through -53 as initial fits or replacement spares on affected aeroplanes.
6. Record replacement work with full maintenance entries, part numbers removed and fitted, SB or AMOC references and authorised signatures.
7. Keep all procurement and parts invoicing records to support compliance during any audit.

Following these steps will align an operator’s actions with the Directive as written: completing the technical replacements by the CASA window, avoiding prohibited parts, and documenting the work in a way that evidences compliance.