{"id":"F2006B09416","name":"AD/ELECT/39 - Bendix Starting Vibrator - Inspection and Modification","slug":"ad-elect-39-bendix-starting-vibrator-inspection-and-modification","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":53793,"registerId":"commonwealth-F2006B09416-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/ELECT/39 - Bendix Starting Vibrator - Inspection and Modification","content":"COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 \\- 107 CIVIL AVIATION SAFETY AUTHORITY\n\nSCHEDULE OF AIRWORTHINESS DIRECTIVES\n\n![](image.001.png)  \nElectrical Equipment\n\nAD/ELECT/39 Bendix Starting Vibrator \\- Inspection and\n\nModification\n\n  \n11/81\n\nApplicability: All starting vibrators with P/Nos. 10-176485-121, 10-176485-122, 10-176485-241,\n\n10-176485-242, 10-382780-12 and 10-38270-24 having a manufacturing date of 901 thru 101, or 8010 thru 8101 permanently stamped on the vibrator. These vibrators are installed in but not limited to the following aircraft powered by reciprocating engines:\n\nBell (Textron) Model 47 series helicopters\n\nBrantley (Hynes) Model B2 series helicopters\n\nEnstrom Model F28, F28A, F28F, 280, 280F helicopters.\n\nModel F28C and 280C helicopters equipped with Lycoming H10-360-E1BD engines.\n\nHughes (Summa Corp) Model 269 series helicopters Hiller (Fairchild Industries) Model UH12 series helicopters Robinson Model R-22 series helicopters.\n\nDocument: Bendix SB No. 614. FAA AD 81-17-01 refers. Compliance: Within 100 hours time in service after 30 November 1981.\n\nBackground: The manufacturer has determined that the combination connector lock tab-plate tolerance of some vibrators may have caused the detachment of the connector from the plate. This detachment can cause grounding and loss of the magneto which could result in air safety being jeopardized.","sortOrder":0}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, targeted safety directive addressing a specific manufacturing defect in specific helicopter models. It has not expanded beyond its original purpose of ensuring the airworthiness of Bendix starting vibrators with identified tolerance issues."},"complexity_factors":["Single, specific technical issue addressed (connector detachment)","Limited applicability: only 6 specific part numbers with specific date stamps","Clear compliance deadline (100 hours time in service after fixed date)","No nested exceptions or conditional logic","Only 4 short sections: applicability, document reference, compliance, and background","No defined terms section or cross-references to other legislation beyond a single FAA AD reference"],"plain_english_summary":"This CASA Airworthiness Directive mandates inspection and modification of certain Bendix starting vibrators installed in specified helicopters because a connector can detach, causing electrical grounding and magneto failure that may lead to in‑flight engine failure. Owners/operators must comply with the manufacturer’s Service Bulletin No. 614 within 100 flight hours of 30 November 1981. Compliance is mandatory to keep affected aircraft airworthy."},"flash_summary":{"complexity_score":5,"scope_assessment":{"changed":false,"description":"The directive confines action to vibrators with specified part numbers and manufacture dates installed in listed helicopter models, and requires work per Bendix SB No. 614 within a fixed time. It aligns with the stated corrective intent (addressing connector lock tab-plate tolerances causing possible magneto loss) and does not broaden scope beyond those items, models, or the referenced service instructions."},"complexity_factors":["Precise technical applicability: multiple specific part numbers and narrow manufacturing date ranges must be identified (Applicability).","Broad operator set: several different helicopter makes and models are listed, spreading compliance across many operators (Applicability).","Mandatory short compliance window that affects maintenance scheduling and aircraft availability (Compliance: Within 100 hours time in service after 30 November 1981).","Reliance on a manufacturer's Service Bulletin to carry out the required work increases procedural dependency on Bendix documentation (Document: Bendix SB No. 614).","Cross-references to an FAA AD add an extra layer of external regulatory material to consult (Document: FAA AD 81-17-01 refers).","Technical inspection focus on a small mechanical tolerance (connector lock tab-plate) creates implementation risk of missing subtle defects (Background).","Regulatory enforceability: issued under the Civil Aviation Safety Authority Schedule of Airworthiness Directives, so non-compliance has regulatory consequences (header).","Potential direct costs to operators for inspection/modification and opportunity costs from grounding or scheduling maintenance (Compliance; Document)."],"plain_english_summary":"This airworthiness directive requires owners/operators to inspect and, if necessary, modify certain Bendix starting vibrators (specific part numbers and manufacture date ranges) fitted to listed helicopter models. It must be done within 100 hours time in service after 30 November 1981 because a connector lock tab-plate tolerance can allow detachment, which may ground a connector and cause loss of the magneto, creating an air-safety risk."}},"importantCases":[],"_links":{"self":"/api/acts/ad-elect-39-bendix-starting-vibrator-inspection-and-modification","history":"/api/acts/ad-elect-39-bendix-starting-vibrator-inspection-and-modification/history","analysis":"/api/acts/ad-elect-39-bendix-starting-vibrator-inspection-and-modification/analysis","conflicts":"/api/acts/ad-elect-39-bendix-starting-vibrator-inspection-and-modification/conflicts","importantCases":"/api/acts/ad-elect-39-bendix-starting-vibrator-inspection-and-modification/important-cases","documents":"/api/acts/ad-elect-39-bendix-starting-vibrator-inspection-and-modification/documents"}}