AD/CESSNA 180/87 - Main Electrical Power Junction Box

The directive revolves around a small set of concrete technical and procedural concepts drawn from the AD text and the referenced service bulletin. The principal technical concept is the main electrical power junction box, specifically MC01-3A I.C. 9 (part number S3100-297) or MC01-3A I.C. 10 (part number S3100-344). The problem stated is incorrectly rated circuit breakers installed in these junction boxes in place of the required 40-amp circuit breakers. The safety mechanism of concern is the main feeder circuit breakers for the junction box: if their rating is lower than specified, they could trip prematurely, which the AD identifies as a potential cause of "partial or complete loss of all electrical power on the airplane" (Background).

Procedurally, the AD imports the Cessna service bulletin SB05-24-01 dated 31 January 2005 as the prescriptive method for performing the inspection and replacement. The AD explicitly permits later revisions of that service bulletin, provided those revisions are approved by the FAA as an AMOC to FAA AD 2005-13-10; in other words, CASA accepts FAA-approved alternate methods of compliance for the equivalent Requirements of this Directive. The linkage to FAA AD 2005-13-10 is explicit in the AD text and in a note referencing FAA AD 2005-13-10 Amdt 39-14147.

The AD specifies applicability narrowly by model and serial number ranges for Cessna Model 182T and T182T aeroplanes: Model 182T serial numbers 18281242 through 18281502, 18281506 and 18281507; T182T serial numbers T18208212 through T18208357. This limits the AD’s material scope to a defined population of aircraft rather than the entire Cessna 180/182 family.

Timing and operational limitations are integral concepts. The AD sets an effective date (1 September 2005), and binds three different compliance windows: the inspection within 30 days after the effective date; replacement required before further flight if incorrect breakers are found; and an immediate change to spare‑parts policy "as of the effective date." Thus the AD imposes an immediate inventory control obligation on operators for spares and a rapid inspection and remedial action cycle for aircraft in service.

Finally, the AD contains an implicit safety‑rationalised trade-off: an inspection and, where needed, replacement, impose time and parts costs on operators in exchange for reducing the risk of an electrical power loss event. The AD itself sets the method for reducing that operational risk (inspect and replace using SB05-24-01), and it authorises FAA-approved alternative compliance routes (AMOCs) for operators who follow those FAA-approved variants.

The directive explicitly applies to owners and operators of Cessna Model 182T and T182T aeroplanes within narrow serial number ranges: 18281242 through 18281502, 18281506 and 18281507 for Model 182T; and T18208212 through T18208357 for Model T182T (Applicability section). Anyone responsible for continuing airworthiness, operation, maintenance and parts management for those airframes falls within the affected cohort. That includes private owners, commercial operators, maintenance organisations and aircraft maintenance engineers who service these specific serial-numbered aircraft.

Primary financial burden falls to those operators and owners. The AD requires them to arrange an inspection "within the next 30 days after the effective date of this Directive" (Compliance: For Requirement 1), which imposes scheduling and labour costs. If incorrect circuit breakers are found, operators must "replace any incorrect amp circuit breaker found during the Requirement 1 inspection with the required 40-amp circuit breaker" in accordance with SB05-24-01. Replacement parts and associated labour are therefore payable by the operator or the owner's maintenance budget.

Maintenance organisations and engineers are the actors who will perform the inspection and replacement in accordance with the service bulletin referenced. They must ensure they use the correct part numbers and follow the procedures in SB05-24-01 or an FAA-approved AMOC to FAA AD 2005-13-10 that CASA accepts as compliant with the Directive. The AD also affects parts custodians and supply chains because Requirement 3 restricts spare parts: "Only 40-amp circuit breakers may be installed as spares in any MC01-3A I.C. 9 or MC01-3A I.C. 10 main electrical power junction box," and that requirement applies "as of the effective date of this Directive." Operators must therefore audit existing spare inventories and purchase compliant 40‑amp breakers as necessary.

CASA is the issuing authority: the AD is signed by David Villiers, Delegate of CASA, and carries an effective date. The AD also interacts with the FAA because it accepts FAA-approved AMOCs to FAA AD 2005-13-10 as acceptable for compliance. Thus, operators who prefer to use an FAA-approved alternate compliance method can do so if that AMOC is accepted by the FAA and is described as acceptable in the CASA AD.

Finally, passengers and insurers are affected indirectly. If the AD is not complied with and a power‑loss event occurs, there are safety and liability consequences. The AD's background frames the safety stakes, stating that incorrect breakers "could lead to partial or complete loss of all electrical power on the airplane." That potential outcome is the risk the AD seeks to reduce.

The directive creates three primary duties for operators of applicable aircraft. Duty 1: inspect any MC01-3A I.C. 9 (P/N S3100-297) or MC01-3A I.C. 10 (P/N S3100-344) main electrical power junction box for incorrect amp circuit breakers in accordance with Cessna Service Bulletin SB05-24-01 dated 31 January 2005, unless this inspection has already been accomplished (Requirement 1). Duty 2: replace any incorrect amp circuit breaker found during Requirement 1 with the required 40‑amp circuit breaker in accordance with SB05-24-01 (Requirement 2). Duty 3: ensure only 40‑amp circuit breakers are installed as spares in the specified junction boxes going forward (Requirement 3).

Timing is part of the duty structure. For Requirement 1, the inspection must occur "within the next 30 days after the effective date of this Directive." For Requirement 2, if an incorrect breaker is found, the replacement is required "before further flight after the Requirement 1 inspection." For Requirement 3, the spare-part restriction applies "as of the effective date of this Directive." The AD thereby converts a technical maintenance recommendation into mandatory, time‑bound duties.

Rights under the AD are procedural and limited. The AD explicitly recognises that "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 2005-13-10, are considered acceptable for compliance with the equivalent Requirements of this Directive." That text creates a limited procedural right for operators to comply using an FAA-approved AMOC to FAA AD 2005-13-10, provided that the AMOC is an FAA approval of a later SB revision. The AD does not set out a process for CASA to approve alternate methods itself in the text provided; it specifically ties acceptance to FAA‑approved AMOCs for that FAA AD.

The AD contains an informational note pointing to FAA AD 2005-13-10 Amdt 39-14147, which informs operators of the corresponding FAA action and provides context for cross‑jurisdictional compliance. The AD does not include penalty clauses, appeal mechanisms, or formal exemption procedures within the text provided. It delegates authority in issuance to a named CASA Delegate (David Villiers), who signs and dates the directive. The AD therefore sets binding duties with a limited right to use FAA‑approved alternate compliance paths but does not, within the text provided, articulate further procedural rights such as review, appeal or detailed documentation requirements.

Operationally, the duties change behaviour in specific ways: operators must audit and possibly alter spare inventories immediately, schedule and perform an inspection within a 30‑day window, and effect immediate corrective action as necessary before further flight. Maintenance records will necessarily reflect the inspection and any replacement work carried out in accordance with SB05-24-01 or an acceptable AMOC, although the AD text does not itself specify documentation or logbook entries.

The AD text supplied does not set out explicit penalties, civil sanctions, criminal offences or a formal enforcement mechanism in its body. It prescribes mandatory inspection, corrective replacement, and spare-part restrictions, together with deadlines and an effective date, but contains no express penalty provision within the text provided. The instrument is signed by a CASA Delegate and sets compliance times; it therefore functions as a regulatory mandate, but the text does not include details about how CASA will detect non-compliance, what administrative or judicial sanctions might follow non-compliance, or the corrective enforcement processes to be used.

Because the source does not describe enforcement mechanisms or penalties, an assessment of likely enforcement must remain framed as a description of what the AD contains rather than an assertion of enforcement practice. The AD does, however, create clear diagnostic and remedial obligations , inspect within 30 days, replace before further flight if non‑conforming breakers are found, and restrict spare breakers as of the effective date. Those obligations are functional compliance triggers; they enable third parties, such as maintenance organisations, operators and potentially insurers, to check that the stated actions took place within the stated timeframes.

The AD references an FAA AD (FAA AD 2005-13-10) and accepts FAA-approved AMOCs to that FAA AD for compliance. That cross-reference creates a compliance pathway: an operator relying on an FAA-approved AMOC for FAA AD 2005-13-10 can treat that FAA approval as acceptable for the equivalent CASA Requirements. The text does not specify whether CASA will independently approve AMOCs or how it will treat non‑FAA-approved alternatives.

In the absence of explicit penalty language within the directive, the AD nevertheless places legal duties on operators by its terms. Practically, failure to comply with a CASA AD is likely to have regulatory and operational consequences in the aviation safety environment in which CASA operates, but the nature and magnitude of those consequences are not set out in the AD text provided. Therefore, the AD identifies obligations and timeframes but leaves unspecified in the text the enforcement measures or penalty mechanisms that CASA may deploy in response to non‑compliance.

The directive expressly interacts with United States FAA action and technical material. It references Cessna Service Bulletin SB05-24-01 dated 31 January 2005 as the prescriptive method for inspection and replacement tasks. It states that "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 2005-13-10, are considered acceptable for compliance with the equivalent Requirements of this Directive." The AD also contains a note stating "FAA AD 2005-13-10 Amdt 39-14147 refers." Those references establish a cross‑jurisdictional compliance linkage: CASA has incorporated an FAA AD and FAA AMOC process into the CASA AD, allowing operators to adopt FAA‑approved alternate methods in place of SB05-24-01 provided the FAA approval exists and is to FAA AD 2005-13-10.

This linkage means that compliance for affected operators may be satisfied either by following the cited Cessna service bulletin in its current form or by following a later SB revision that the FAA has approved as an AMOC to FAA AD 2005-13-10. The AD does not state that CASA itself will issue AMOCs, nor does it set out a procedure for CASA to approve other alternate methods; the acceptance language is limited to FAA-approved AMOCs. Therefore, the AD creates a deference relationship to FAA approvals for the specific matter of acceptable later SB revisions and AMOCs relating to FAA AD 2005-13-10.

Within the limited scope of the AD text, there is no explicit reference to other Australian statutes, regulations, or obligations (for example, the Civil Aviation Regulations or Parts of the Civil Aviation Safety Regulations), and the AD does not purport to amend or displace any other Australian instrument in the text provided. The AD’s own effective date and compliance windows stand on their own terms. The directive does not reference dispute resolution procedures, appeal rights, or interactions with contractual arrangements, maintenance organisation approvals or insurance terms.

Operationally, the AD will interact with internal maintenance procedures, airworthiness records and operator compliance workflows. The requirement that replacements be performed "in accordance with SB05-24-01" means that procedural detail, parts specifications and acceptance criteria are contained in that service bulletin, which becomes the technical compliance standard for operations under this AD unless an FAA AMOC is used. The AD therefore sits on top of, and refers readers to, technical documents maintained by the manufacturer and procedural approvals maintained by the FAA.

In short, the AD explicitly interlocks with FAA AD 2005-13-10 and FAA-approved AMOCs and imports a manufacturer service bulletin as the avenue for technical compliance. The AD does not in the provided text set out broader legal interaction or enforcement mechanisms with Australian statutory instruments.

The instrument itself records a narrow amendment history limited to the effective date and the reference to later approved service bulletin revisions. The AD is dated 22 July 2005 through the signature of David Villiers, Delegate of CASA, and it states that it "becomes effective on 1 September 2005." The text indicates that Cessna Service Bulletin SB05-24-01 dated 31 January 2005 is the prescriptive document for inspection and replacement. It further records that "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 2005-13-10, are considered acceptable for compliance with the equivalent Requirements of this Directive."

Beyond that, the AD does not list prior versions of the CASA directive, nor does it show subsequent amendments or revocations in the provided material. The only amendment-style mechanism the AD expressly recognises is the FAA approval of later revisions of the service bulletin as AMOCs to FAA AD 2005-13-10, which the AD will accept as satisfying the equivalent CASA Requirements. The AD includes a Note pointing to FAA AD 2005-13-10 Amdt 39-14147, which situates the CASA AD among cognate FAA regulatory action, but no further amendment chronology or serially numbered amendments are recorded in the text supplied.

Therefore, from the document provided, the amendment history is limited to: (a) issuance by CASA via a delegate on 22 July 2005, (b) an effective date of 1 September 2005, (c) reliance on Cessna Service Bulletin SB05-24-01 dated 31 January 2005, and (d) an expressed acceptance of later SB revisions if those are approved by the FAA as AMOCs to FAA AD 2005-13-10. The AD does not supply any record of later CASA amendments, rescissions or reissues in the material provided.

The AD text supplied contains no references to litigation, legal challenges, judicial review or precedent. It does not identify any litigation either involving CASA, Cessna, operators, maintenance organisations, or third parties related to this specific directive. The document names only the FAA AD 2005-13-10 as a related foreign regulatory instrument; that cross‑reference is presented as technical and procedural context rather than as the subject of any litigation noted in this text.

Because the source is silent on litigation, the AD provides no factual basis within its text to describe any court decisions, administrative appeals, or disputes arising from the directive’s content, issuance, or enforcement. Any statement about litigation history beyond the document’s silence would be outside the scope of the supplied material. Therefore, readers should treat the absence of litigation references in the AD as the only reliable statement available from the text: the directive does not report, cite or summarise any litigation history.

Practically, the absence of litigation references in the AD does not itself speak to whether litigation subsequently occurred, or whether disputes might arise in future, but that falls outside the present document. From the text given, there is no litigation history to catalogue.

The AD contains several operational details and narrow applicability conditions that can catch operators who do not read carefully. First, applicability is model- and serial-number specific. The AD applies only to Model 182T and T182T aeroplanes within specific serial-number ranges: Model 182T serials 18281242 through 18281502, 18281506 and 18281507; T182T serials T18208212 through T18208357. Operators of other Cessna 180/182 variants or other serial numbers are not covered by the text as supplied. Overlooking those specific serial-number ranges can cause unnecessary inspections or, conversely, failure to inspect an affected airplane.

Second, the AD refers to two distinct part numbers for the junction box: MC01-3A I.C. 9 (P/N S3100-297) and MC01-3A I.C. 10 (P/N S3100-344). The inspection obligation applies to "any MC01-3A I.C. 9 (part number (P/N) S3100-297) or MC01-3A I.C. 10 (P/N S3100-344) main electrical power junction box." Operators must confirm both the junction box assembly identification and the part number before assuming the AD applies to a particular airframe.

Third, the AD prescribes the method of inspection and replacement by referring to Cessna Service Bulletin SB05-24-01 dated 31 January 2005. Operators intending to comply must use the procedures and part specifications in that particular service bulletin unless they have an FAA-approved AMOC in respect of a later revision. Relying on other procedures, or on an unapproved later SB revision, risks non‑conformance with the AD unless the alternative has FAA AMOC status and is thereby accepted by CASA as compliant with the equivalent Requirements.

Fourth, timing matters. Requirement 1 must be done "within the next 30 days after the effective date of this Directive" and the effective date is 1 September 2005. Requirement 2 (replacement) must be completed "before further flight after the Requirement 1 inspection." That creates an immediate grounding risk for any aircraft where an incorrect breaker is found during inspection: the aircraft must not be flown again until the required 40‑amp breaker is fitted.

Fifth, Requirement 3 changes spare-part policy immediately: "Only 40‑amp circuit breakers may be installed as spares in any MC01-3A I.C. 9 or MC01-3A I.C. 10 main electrical power junction box," and this applies "as of the effective date of this Directive." Operators must therefore inventory spares and either retire or replace any non‑40‑amp spares that might otherwise be used during maintenance. Failure to update spare inventories can result in incorrect replacement during field maintenance.

Sixth, AMOC reliance needs careful documentation. The AD accepts later SB revisions approved by the FAA as AMOCs to FAA AD 2005-13-10. If an operator wishes to use an FAA-approved AMOC, that FAA approval must be demonstrably applicable to FAA AD 2005-13-10 and to the later SB revision used; otherwise, CASA’s explicit acceptance language in this AD may not be satisfied.

Finally, the AD itself does not specify enforcement procedures or penalties in the text provided. That means operators cannot rely on the AD to lay out remedial processes, appeals, or documentation obligations beyond the technical tasks and deadlines specified. Those procedural matters will be governed by other instruments or CASAs standard processes not set out in this AD text. Operators should therefore be cautious to synchronise this AD’s duties with their regulatory compliance and record-keeping systems.

Compliance under the AD is procedural and technical. Follow these concrete steps drawn from the AD text and its compliance windows.

1. Confirm applicability. Check the aeroplane model and serial number against the Applicability section: Model 182T serial numbers 18281242-18281502, 18281506 and 18281507; T182T serial numbers T18208212-T18208357. Verify the presence of either MC01-3A I.C. 9 (P/N S3100-297) or MC01-3A I.C. 10 (P/N S3100-344) on the airframe before proceeding.

2. Schedule and perform the inspection (Requirement 1). The AD requires that "Unless already accomplished, inspect any MC01-3A I.C. 9 ... or MC01-3A I.C. 10 ... main electrical power junction box for any incorrect amperage (amp) circuit breaker installed in place of the required 40-amp circuit breakers in accordance with Cessna Service Bulletin (SB) SB05-24-01 dated 31 January 2005." The inspection must be completed "within the next 30 days after the effective date of this Directive." The effective date specified is 1 September 2005, so the inspection window runs for 30 days from that date under the AD.

3. If an incorrect breaker is found, replace it before further flight (Requirement 2). The AD mandates: "Replace any incorrect amp circuit breaker found during the Requirement 1 inspection with the required 40-amp circuit breaker in accordance with SB05-24-01." Replacement must be completed "before further flight after the Requirement 1 inspection." That means if a non‑conforming breaker is discovered, the aircraft must be grounded until replacement is effected in accordance with the service bulletin.

4. Change spare parts practice immediately (Requirement 3). The AD states: "Only 40-amp circuit breakers may be installed as spares in any MC01-3A I.C. 9 or MC01-3A I.C. 10 main electrical power junction box." This applies "as of the effective date of this Directive." Operators must therefore audit spare inventories, remove or segregate non‑40‑amp spares for these junction boxes, and ensure that only a 40‑amp breaker will be used for any maintenance replacement in those locations.

5. Use the prescribed technical standard or an FAA‑approved AMOC where applicable. The AD prescribes compliance "in accordance with Cessna Service Bulletin (SB) SB05-24-01 dated 31 January 2005." It also allows "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 2005-13-10" to be used for compliance. If you intend to rely on a later SB revision, confirm that the FAA has approved that revision as an AMOC to FAA AD 2005-13-10 and retain evidence of that FAA approval to demonstrate compliance with the CASA AD's acceptance condition.

6. Document actions. Although the AD text does not specify explicit logbook or reporting language, standard airworthiness practice requires maintaining maintenance records showing inspections and corrective actions. Record the inspection date within the 30‑day window, the findings, any replacement of circuit breakers, the part numbers installed (confirmation that 40‑amp breakers were fitted), and reference to SB05-24-01 or to the FAA AMOC relied upon. Keep copies of the service bulletin pages used and any FAA AMOC documentation referenced for future audits.

7. Coordinate with maintenance organisations. If using an approved maintenance organisation, ensure that the organisation is provided the AD text and SB05-24-01 and that the organisation schedules the inspection and any remedial work within the AD timeframes. Verify that the maintenance organisation uses the correct part numbers and installation procedures set out in the SB or in the FAA AMOC.

8. Consider operational impacts. If an inspection reveals non‑conforming breakers, the aircraft must not fly until replacements are fitted. Schedule the inspection to minimise disruption and ensure availability of 40‑amp replacement parts so that a required replacement does not unduly ground the aircraft.

9. Cross‑reference FAA AD if necessary. The AD notes "FAA AD 2005-13-10 Amdt 39-14147 refers." If seeking technical background or alternate compliance routes, review that FAA AD and any FAA AMOC approvals relevant to this matter. Only FAA‑approved AMOCs tied to FAA AD 2005-13-10 are accepted by CASA as compliant with the equivalent CASA Requirements per the AD language.

10. Retain evidence of compliance. Maintain records that demonstrate the inspection was performed within the 30‑day window from the effective date, that any replacements were effected before further flight, and that spare inventories were adjusted as required "as of the effective date." Even though the AD text does not require a specific reporting form, preserve documentation to demonstrate compliance in the event of queries.

Following these steps aligns maintenance actions with the procedural commands and timelines set out in the AD: inspect within 30 days (Requirement 1), replace non‑conforming breakers before further flight (Requirement 2), and restrict spares to 40‑amp breakers from the effective date (Requirement 3), all "in accordance with Cessna Service Bulletin SB05-24-01 dated 31 January 2005" unless an FAA-approved AMOC to FAA AD 2005-13-10 is used.