{"id":"F2006B09715","name":"AD/F27/148 - DC Generator Control Panel","slug":"ad-f27-148-dc-generator-control-panel","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":115891,"registerId":"commonwealth-F2006B09715-current","compilationNumber":null,"startDate":"2026-04-03","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/F27/148 - DC Generator Control Panel","content":"COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 \\- 105 CIVIL AVIATION SAFETY AUTHORITY\n\nSCHEDULE OF AIRWORTHINESS DIRECTIVES\n\n![](image.001.png)  \nFokker F27 Series Aeroplanes\n\nAD/F27/148 DC Generator Control Panel 12/99\n\nApplicability: Model F27 Mk 100 through Mk 700 series aeroplanes, all serial numbers. Requirement: Inspect the DC generator control panels in accordance with STORK Fokker Service\n\nBulletin F27/24-79 dated 28 April 1999.\n\nNote: RLD BLA 1999-093 (A) refers.\n\nCompliance: Within two calendar months from the effective date of this Directive and thereafter, at intervals not to exceed 4000 hours time in service.\n\nThis Airworthiness Directive becomes effective on 2 December 1999.\n\nBackground: The RLD has received numerous incident reports concerning DC generator overvoltage on F27 aeroplanes. These incidents invariably resulted in loss of both DC generator systems and loss of several other systems. Investigation revealed that the overvoltage was caused by incorrect installation of DC generator control panels, together with bad solder joints, bad wire insulation and incorrect functioning of the control panels.\n\nThese conditions, if not detected and corrected, could result in further incidents of overvoltage of the aeroplane electrical system. This Directive requires the regular inspection of the control panels.","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 technical defect in a specific aircraft type. It has not expanded beyond its original purpose of mandating inspections to prevent DC generator overvoltage failures."},"complexity_factors":["Single, specific technical requirement (inspect control panels)","Only one defined term of note ('time in service' implied but not explicitly defined in text)","No cross-references to other legislation or regulations beyond the parenthetical citation","Simple conditional structure: one-time compliance + recurring interval","Short document (under 200 words of substantive text)","Clear, unambiguous compliance deadline and method"],"plain_english_summary":"This CASA Airworthiness Directive mandates inspection of DC generator control panels on Fokker F27 aircraft after multiple RLD-reported overvoltage failures that can disable DC power and critical systems. Operators (airlines, charters, anyone flying F27s) must follow the manufacturer’s service bulletin to inspect and remedy faulty installations, soldering, wiring, or malfunctioning panels to ensure safe electrical operation."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The Directive sets out applicability, inspection procedure reference, initial deadline and recurring interval without altering the population of affected aircraft or adding broader obligations. The instrument does not indicate a change from any earlier scope; it imposes inspection and repair duties consistent with its stated safety purpose (Applicability; Requirement; Compliance; Background)."},"complexity_factors":["Clear, narrow applicability to specific F27 models but covering all serial numbers (Applicability)","Fixed initial compliance deadline plus recurring interval (two months then every 4,000 hours) creates scheduling/maintenance planning requirements (Compliance)","Relies on an external technical document (STORK Fokker Service Bulletin F27/24‑79) for inspection procedures, requiring access to and interpretation of that bulletin (Requirement)","Technical inspections and potential repairs involve electrical work (solder joints, insulation, panel function) that may need specialised skills and parts (Background)","Legal force of an Airworthiness Directive makes non‑compliance consequential for operators and regulators (entire instrument)"],"plain_english_summary":"This Airworthiness Directive requires operators of Fokker F27 Mk100–Mk700 aeroplanes (all serial numbers) to inspect DC generator control panels using STORK Fokker Service Bulletin F27/24‑79 (Requirement; Applicability). Inspections must occur within two calendar months of the effective date and then every 4,000 hours time in service (Compliance). The operator bears the inspection and repair costs; the inspections target overvoltage risks from incorrect installation, bad solder joints, poor wire insulation and faulty panel operation (Background)."}},"importantCases":[],"_links":{"self":"/api/acts/ad-f27-148-dc-generator-control-panel","history":"/api/acts/ad-f27-148-dc-generator-control-panel/history","analysis":"/api/acts/ad-f27-148-dc-generator-control-panel/analysis","conflicts":"/api/acts/ad-f27-148-dc-generator-control-panel/conflicts","importantCases":"/api/acts/ad-f27-148-dc-generator-control-panel/important-cases","documents":"/api/acts/ad-f27-148-dc-generator-control-panel/documents"}}