{"id":"F2005L02067","name":"AD/CESSNA 206/61 - Main Electrical Power Junction Box","slug":"ad-cessna-206-61-main-electrical-power-junction-box","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":36262,"registerId":"commonwealth-F2005L02067-current","compilationNumber":null,"startDate":"2026-04-01","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"Cessna 206 Series Aeroplanes","sectionType":"division","heading":"Cessna 206 Series Aeroplanes","content":"### Cessna 206 Series Aeroplanes\n\n| AD/CESSNA 206/61 | Main Electrical Power Junction Box | 9/2005 |\n| ---------------- | ---------------------------------- | ------ |\n\n```html\n

Applicability:

Cessna Model 206H and T206H aeroplanes as follows:

Model

Serial Numbers

206H

T206H

20608195 through 20608223, 20608225, and 20608226
T20608410 through T20608475, T20608477 through T20608501, T20608503 and T20608506

Requirement:

1. Unless already accomplished, inspect 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 for any incorrect amperage (amp) circuit beaker installed in place of the required 40-amp circuit breakers in accordance with Cessna Service Bulletin (SB) SB05-24-01 dated 31 January 2005.

2. 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.

3. 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.

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.

Note: FAA AD 2005-13-10 Amdt 39-14147 refers.

Compliance:

For Requirement 1 - Within the next 30 days after the effective date of this Directive.

For Requirement 2 - Before further flight after the Requirement 1 inspection.

For Requirement 3 - As of the effective date of this Directive.

This Airworthiness Directive becomes effective on 1 September 2005.

\n```\n\n| Background: | The FAA has received several reports of circuit breakers that are not the correct 40-amp circuit breaker installed in the MC01-3A main electrical power junction box. Incorrectly rated circuit breakers could result in premature tripping of the power junction box main feeder circuit breakers and could lead to partial or complete loss of all electrical power on the airplane. |\n| ----------- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n| | This Directive requires the inspection of the main electrical power junction box and, if necessary, the replacement of any incorrect circuit breaker |\n\n![](image.001.png) \nDavid Villiers \nDelegate of the Civil Aviation Safety Authority\n\n22 July 2005","sortOrder":0},{"sectionNumber":"AD/CESSNA 206/61","sectionType":"part","heading":"AD/CESSNA 206/61","content":"## AD/CESSNA 206/61","sortOrder":1},{"sectionNumber":"Main Electrical Power Junction Box","sectionType":"part","heading":"Main Electrical Power Junction Box","content":"## Main Electrical Power Junction Box","sortOrder":2},{"sectionNumber":"9/2005","sectionType":"part","heading":"9/2005","content":"## 9/2005","sortOrder":3}],"analysis":{"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":false,"description":"This directive remains narrowly focused on its original safety purpose: identifying and replacing incorrectly rated circuit breakers in specific MC01-3A junction boxes on specified Cessna 206H/T206H serial numbers, and restricting spares to the correct 40‑amp breakers. It does not add unrelated requirements or expand to other systems or aircraft beyond those listed; the only extension is acceptance of FAA‑approved later SB revisions as alternate compliance methods, which narrows procedural rigidity rather than expanding substantive scope."},"complexity_factors":["Short, three-action structure (Requirement 1: inspect; Requirement 2: replace; Requirement 3: spare restriction).","Single cross-reference to one manufacturer Service Bulletin (SB05-24-01) and to a related FAA AD (FAA AD 2005-13-10) and FAA-approved AMOCs.","A finite list of serial-number ranges determining applicability (several contiguous ranges for two models).","Three distinct compliance timelines (30 days; before further flight; immediate for spares).","No layered exceptions or nested conditional rules beyond acceptance of FAA‑approved SB revisions as AMOCs."],"plain_english_summary":"**What this instrument does (in plain English)**\n\n- It requires owners/operators of certain Cessna 206H and T206H aeroplanes to check the main electrical power junction box and fix any wrongly-rated circuit breakers. The affected junction boxes are the MC01-3A I.C. 9 (P/N S3100-297) and MC01-3A I.C. 10 (P/N S3100-344).\n\n- Specifically, the directive requires:\n - An inspection to see whether any circuit breaker other than the required 40‑amp breaker is installed in the main feeder position (Requirement 1). The inspection must be done in accordance with Cessna Service Bulletin SB05-24-01 (Requirement 1).\n - If an incorrect (wrong-amp) breaker is found, it must be replaced with the required 40‑amp circuit breaker before the aircraft is flown again (Requirement 2).\n - From the effective date forward, only 40‑amp circuit breakers may be carried as spares for those junction boxes (Requirement 3).\n\n- Which aeroplanes are affected: the AD lists specific serial-number ranges for Cessna 206H and T206H aeroplanes (see the serial number table in the directive). If your aircraft serial number is inside those ranges, the requirements apply (Applicability section).\n\n- Timing: the inspection must be completed within 30 days of the directive taking effect (Compliance for Requirement 1). Any replacements discovered must be completed before further flight (Compliance for Requirement 2). The spare-part restriction is effective immediately (Compliance for Requirement 3).\n\n- How to comply: the directive points to Cessna Service Bulletin SB05-24-01 for the inspection and replacement procedure. Later revisions of that SB that the FAA has approved as an Alternate Method Of Compliance (AMOC) are acceptable substitutes (the AD cross-references FAA AD 2005-13-10 and accepts FAA‑approved SB revisions).\n\n**Who pays and who decides**\n\n- Owners/operators (or their maintenance providers) pay for the inspection, any replacements, and any downtime while the aircraft is grounded for corrective work. The maintenance provider (an appropriately authorised engineer or maintenance organisation) performs the inspection and replacement following the Cessna service instructions or an FAA‑approved AMOC.\n\n**Why the regulator issued this directive (stated rationale)**\n\n- The FAA received reports that circuit breakers installed in the MC01-3A main junction box were not the specified 40‑amp units. A lower-rated or otherwise incorrect breaker could trip prematurely, causing partial or complete loss of electrical power on the aeroplane. The AD therefore aims to remove the incorrect breakers and ensure only the correct 40‑amp breakers are fitted or carried as spares.\n\n**Practical effects, trade-offs and implementation issues**\n\n- Direct effect on behaviour: operators must inspect within 30 days, replace incorrect parts before flying, and change spare-part inventories to only hold 40‑amp units for these junction boxes (Requirement 1–3; Compliance).\n\n- Costs and downtime: the main costs are labour for the inspection and the parts (replacement 40‑amp breakers if needed). If an incorrect breaker is found, the aircraft may be grounded until replacement is fitted (Requirement 2 — \"before further flight\"). This creates immediate opportunity costs from lost utilisation. The spare-part restriction may force operators to discard incompatible spares or buy compliant spares.\n\n- Supply and logistics risk: if 40‑amp breakers are in limited supply, operators may face delays sourcing parts, which increases grounding time. The AD accepts FAA‑approved SB revisions as AMOCs, which can ease compliance if an alternative approved method exists (note on later SB revisions/AMOC).\n\n- Enforcement and discretion: the AD prescribes actions and timing; compliance is mechanical (inspect, replace if wrong, only keep 40‑amp spares). The maintenance organisation decides the practical work scheduling and may rely on an FAA‑approved AMOC where available.\n\n- Market effects: minimal on competition or ownership; the effect is limited to maintenance costs and spare-parts inventory management for affected aircraft owners/operators. Independent maintenance providers and parts suppliers will be the parties adjusting supply and services to meet the requirement.\n\n**Concrete citation of operative parts**\n\n- Inspection requirement: \"Requirement 1\" (inspect MC01-3A I.C. 9 or I.C. 10 for incorrect amp circuit breaker) and reference to SB05-24-01.\n- Replacement requirement: \"Requirement 2\" (replace any incorrect breaker with required 40‑amp unit in accordance with SB05-24-01) and \"before further flight\" timing.\n- Spare restriction: \"Requirement 3\" (only 40‑amp breakers may be installed as spares) and effective immediately.\n- Compliance deadlines: Requirement 1 within 30 days of the directive; Requirement 2 before further flight; Requirement 3 as of the effective date. The directive accepts later SB revisions approved by the FAA as AMOCs.\n\n(Sections referenced are taken from the directive as labelled: Applicability; Requirement 1–3; Compliance; and the Note referring to FAA AD 2005‑13‑10.)"},"flash_summary_failed":{"failed":true,"reason":"Unauthenticated. Configure AI_GATEWAY_API_KEY or use a provider module. Learn more: https://ai-sdk.dev/unauthenticated-ai-gateway","source":"analysis-cron"},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This AD maintains its original narrow scope — addressing a specific manufacturing defect in a defined batch of Cessna aircraft. The document references the FAA's equivalent directive but does not expand beyond the original safety purpose of ensuring correct circuit breaker installation."},"complexity_factors":["Single, discrete safety issue addressed (incorrect circuit breaker rating)","Only 3 specific requirements with clear sequential logic","Limited applicability: 2 aircraft models with explicitly listed serial number ranges","No nested exceptions or conditional sub-clauses","Cross-reference to only one external document (Cessna Service Bulletin SB05-24-01)","Straightforward compliance timeline (30 days / before next flight / immediate)","Minimal defined terminology (only part numbers and model specifications)"],"plain_english_summary":"This AD orders owners/operators and maintenance engineers of certain Cessna 206H and T206H aeroplanes to inspect the main electrical junction box for incorrectly fitted circuit breakers that can trip and cut power. Any wrong breakers must be replaced with the specified 40‑amp units before further flight, and only 40‑amp breakers may be used as replacements. The measure prevents unexpected electrical loss that could disable radios, navigation and lighting."}},"importantCases":[],"_links":{"self":"/api/acts/ad-cessna-206-61-main-electrical-power-junction-box","history":"/api/acts/ad-cessna-206-61-main-electrical-power-junction-box/history","analysis":"/api/acts/ad-cessna-206-61-main-electrical-power-junction-box/analysis","conflicts":"/api/acts/ad-cessna-206-61-main-electrical-power-junction-box/conflicts","importantCases":"/api/acts/ad-cessna-206-61-main-electrical-power-junction-box/important-cases","documents":"/api/acts/ad-cessna-206-61-main-electrical-power-junction-box/documents"}}