{"id":"F2006B09791","name":"AD/F28/56 - Instrument Panel Lights Ballast Transformers","slug":"ad-f28-56-instrument-panel-lights-ballast-transformers","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":54711,"registerId":"commonwealth-F2006B09791-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/F28/56 - Instrument Panel Lights Ballast Transformers","content":"---\nmeta-content-style-type: text/css\nmeta-content-type: application/xhtml+xml; charset=utf-8\nmeta-generator: Aspose.Words for .NET 22.10.0\n---\n\n?xml version=\"1.0\" encoding=\"utf-8\" standalone=\"no\"?>\n\nCOMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY\n\nSCHEDULE OF AIRWORTHINESS DIRECTIVES\n\n \n\n![](image.001.png)  Fokker F28 Series Aeroplanes\n\n \n\nAD/F28/56 Instrument Panel Lights Ballast Transformers 9/88\n\nApplicability: All models S/No’s 11003 to 11231 inclusive, 11991 and 11992.\n\n \n\nRequirement: Relocate instrument panel light ballast transformers in accordance with Fokker Service Bulletin F28/33-34 dated 1 June 1988 or later.\n\n \n\nNote: RLD AD 88-31 also refer.\n\n \n\nCompliance: Prior to 8 March 1989.\n\n \n\nBackground:  The instrument panel lighting ballast transformers are prone to overheating and subsequent failure with the emission of smoke in front of the pilots. To prevent this, the transformers are moved to the LH cockpit sidewall to improve ventilation.\n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n","sortOrder":0}],"analysis":{"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The instrument does not broaden regulatory scope beyond the aircraft identified in the Applicability section. It imposes a specific corrective modification (relocation of the ballast transformers) and a deadline for completion, but does not extend obligations to aircraft outside the listed serial numbers or add broader operational restrictions. The directive remains focused on correcting the overheating/smoke risk described in the Background by mandating the relocation per the specified Service Bulletin (\"Applicability\", \"Requirement\", \"Background\")."},"complexity_factors":["Narrow and specific applicability limited to particular serial numbers (\"Applicability\")","Single, well-defined corrective action specified (relocation per a named Service Bulletin) (\"Requirement\")","Firm compliance deadline introduces scheduling/downtime constraints (\"Compliance\")","Mandate ties compliance to a manufacturer Service Bulletin dated or later, creating dependency on that document and any revisions (\"Requirement\")","Cross-reference to another AD may require checking additional documents or obligations (\"Note\")"],"plain_english_summary":"This directive requires owners/operators of specified Fokker F28s (serials 11003–11231, 11991–11992) to relocate instrument-panel lighting ballast transformers to the left cockpit sidewall by a fixed deadline, following Fokker Service Bulletin F28/33‑34. It addresses overheating/smoke risk, imposes the retrofit and associated costs on operators, and cross-references another AD that may add obligations."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, single-issue safety directive addressing a specific mechanical defect in a specific aircraft type. There is no indication of scope creep; it remains tightly focused on the original safety concern (overheating ballast transformers)."},"complexity_factors":["Single, unambiguous requirement with no conditional logic","Only one defined applicability criterion (specific serial number ranges)","No cross-references to other legislation sections (only a reference to a manufacturer's service bulletin and a related foreign directive)","No exceptions, exemptions, or nested conditions","Extremely short document (under 200 words of substantive content)"],"plain_english_summary":"This is an **Airworthiness Directive** — a mandatory safety order issued by Australia's Civil Aviation Safety Authority (CASA) that requires specific repairs or modifications to aircraft.\n\n**What it does:**\nOrders owners and operators of certain **Fokker F28 series aircraft** to move the ballast transformers for their instrument panel lights from their original location to the left-hand cockpit sidewall.\n\n**Who it affects:**\nAnyone who owns or operates Fokker F28 aircraft with serial numbers 11003 through 11231, plus serial numbers 11991 and 11992.\n\n**Why it matters:**\nThe original transformers were overheating, failing, and emitting smoke directly in front of the pilots — a serious flight safety hazard. Relocating them to the sidewall improves ventilation and prevents this dangerous failure mode.\n\n**What must be done:**\nThe relocation must be carried out following Fokker's official Service Bulletin F28/33-34 (dated 1 June 1988 or later), and completed **before 8 March 1989**."}},"importantCases":[],"_links":{"self":"/api/acts/ad-f28-56-instrument-panel-lights-ballast-transformers","history":"/api/acts/ad-f28-56-instrument-panel-lights-ballast-transformers/history","analysis":"/api/acts/ad-f28-56-instrument-panel-lights-ballast-transformers/analysis","conflicts":"/api/acts/ad-f28-56-instrument-panel-lights-ballast-transformers/conflicts","importantCases":"/api/acts/ad-f28-56-instrument-panel-lights-ballast-transformers/important-cases","documents":"/api/acts/ad-f28-56-instrument-panel-lights-ballast-transformers/documents"}}