{"id":"F2006B08411","name":"AD/CESSNA 525/2 - Direct Current Power Battery Switch","slug":"ad-cessna-525-2-direct-current-power-battery-switch","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":115871,"registerId":"commonwealth-F2006B08411-current","compilationNumber":null,"startDate":"2026-04-03","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"AIRWORTHINESS DIRECTIVE","sectionType":"part","heading":"AIRWORTHINESS DIRECTIVE","content":"# ![](image.001.png)  \nAIRWORTHINESS DIRECTIVE\n\nFor the reasons set out in the background section, the CASA delegate whose signature appears below issues the following Airworthiness Directive (AD) under subregulation 39.1 (1) of CAR 1998. The AD requires that the action set out in the requirement section (being action that the delegate considers necessary to correct the unsafe condition) be taken in relation to the aircraft or aeronautical product mentioned in the applicability section: (a) in the circumstances mentioned in the requirement section; and (b) in accordance with the instructions set out in the requirement section; and (c) at the time mentioned in the compliance section.\n\n![](image.001.png)\n\nCessna 525 Series Aeroplanes","sortOrder":0},{"sectionNumber":"AD/CESSNA 525/2 Direct Current Power Bat","sectionType":"part","heading":"AD/CESSNA 525/2 Direct Current Power Battery Switch 4/2001","content":"# AD/CESSNA 525/2 Direct Current Power Battery Switch 4/2001\n\nDM\n\nApplicability: Model 525 (CitationJet 1) aeroplanes, serial numbers 525-0360 through 525-0400, that incorporate a direct current (DC) power battery switch, Eaton Part Number (P/N) A3-205-01/P.\n\nRequirement: 1. Inspect the aeroplane to determine whether a DC power battery switch, Eaton P/N A3-205-01/P, with a manufacturer's date code of 9926 through 0039, is installed. If the affected DC power switch is not installed further action is not required.\n\n    2. If, as a result of the Requirement 1 inspection, one of the affected DC power battery switches is found to be installed, or the switch cannot be positively identified as not being one of the affected types, replace the switch in accordance with the Accomplishment Instructions section of Cessna Service Bulletin SB525- 24-20, dated 16 November 2000, with a new switch of the same part number that has a manufacturer's date code of 0040 or later.\n\n    3. DC power battery switches, Eaton P/N A3-205-01/P with a manufacturer's date code of 9926 through 0039 may not be installed on any aeroplane as a replacement part.\n\nNote: FAA AD 2001-02-13 Amdt 39-12099 refers.\n\nCompliance: For Compliance 1 - During the next phase check or within 60 days after the effective date of this Directive, whichever occurs first.\n\nFor Compliance 2 - Before further flight after the inspection. For Compliance 3 \\- As of the effective date of this Directive.\n\nThis Airworthiness Directive becomes effective on 28 February 2001.\n\nBackground: The Federal Aviation Administration received reports of a potential problem with 8- pole DC battery switches that were installed on Cessna Model 525 (CitationJet 1) aeroplanes. Eaton is the original equipment manufacturer of the affected switch (Eaton P/N A3-205-01/P).","sortOrder":1}],"analysis":{"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The AD applies narrowly to the serial-numbered subset of Model 525 aeroplanes that incorporate Eaton P/N A3-205-01/P switches with specified manufacturer date codes (Applicability; Requirement 1–3). The text frames this targeting as a response to reported problems with the 8‑pole DC battery switch (Background) and does not indicate any expansion or narrowing from an earlier stated scope within the instrument itself."},"complexity_factors":["Narrow applicability reduces complexity: limited to Model 525 serials 525-0360 through 525-0400 (Applicability).","Specific part and date-code criteria simplify identification but create a binary test: Eaton P/N A3-205-01/P with manufacturer's date code 9926–0039 triggers action (Requirement 1–3).","Identification uncertainty increases operational cost: if a switch cannot be positively identified as unaffected, replacement is required (Requirement 2).","Clear mandatory remedy and prohibition: replace with same P/N but date code 0040 or later, and affected switches may not be installed as replacement parts (Requirement 2–3).","Prescribed compliance windows are straightforward but short for flight-safety work: inspection at next phase check or within 60 days; replacement before further flight (Compliance).","Implementation depends on external instructions: replacement must follow Cessna Service Bulletin SB525-24-20 (Requirement 2), creating reliance on that document for technical details.","Enforcement and issuance authority is explicit: AD issued by CASA delegate under CAR 1998 subregulation 39.1(1), so regulatory discretion is limited to issuing the AD (first paragraph).","Link to FAA action may require cross-reference: Note refers to FAA AD 2001-02-13, possibly affecting interpretation or global compliance practices (Note)."],"plain_english_summary":"This Airworthiness Directive requires operators of Cessna 525 (CitationJet 1) aeroplanes serial numbers 525-0360 through 525-0400 to inspect for a specific Eaton DC battery switch (P/N A3-205-01/P) with manufacturer's date codes 9926–0039 and, if found or not positively identifiable, replace it with a switch dated 0040 or later. Inspection must occur at the next phase check or within 60 days and replacement must be done before further flight. It affects aircraft owners/operators and maintenance providers because of a reported potential switch problem."},"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 Airworthiness Directive maintains its original narrow scope. It addresses a specific safety defect identified by the FAA in a limited production batch of battery switches for a specific aircraft model. There is no evidence of scope creep; the directive precisely targets the identified unsafe condition without expanding to unrelated systems or aircraft types."},"complexity_factors":["Single, specific aircraft model and narrow serial number range (525-0360 through 525-0400)","Only one specific part number affected (Eaton P/N A3-205-01/P)","Clear date code range for affected parts (9926 through 0039)","Straightforward three-step requirement structure (inspect, replace if found, prohibition on future installation)","Simple compliance timeline with only two conditions (next phase check or 60 days)","No nested exceptions, conditional logic, or extensive cross-referencing to other legislation","Single reference to external technical document (Cessna Service Bulletin) with specific date"],"plain_english_summary":"This CASA Airworthiness Directive requires owners/operators of Cessna CitationJet 1 (model 525) serials 525-0360 through 525-0400 to inspect for Eaton battery switch A3-205-01/P manufactured between week 26/1999 and week 39/2000. If present, the switch must be replaced before next flight with a version made week 40/2000 or later, following Cessna SB525-24-20, and the faulty switch is prohibited for future installation. Compliance is at next maintenance or within 60 days."}},"importantCases":[],"_links":{"self":"/api/acts/ad-cessna-525-2-direct-current-power-battery-switch","history":"/api/acts/ad-cessna-525-2-direct-current-power-battery-switch/history","analysis":"/api/acts/ad-cessna-525-2-direct-current-power-battery-switch/analysis","conflicts":"/api/acts/ad-cessna-525-2-direct-current-power-battery-switch/conflicts","importantCases":"/api/acts/ad-cessna-525-2-direct-current-power-battery-switch/important-cases","documents":"/api/acts/ad-cessna-525-2-direct-current-power-battery-switch/documents"}}