{"id":"F2006B10406","name":"AD/HS 125/127 Amdt 1 - Cabin and Toilet Fluorescent Lighting","slug":"ad-hs-125-127-amdt-1-cabin-and-toilet-fluorescent-lighting","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":116075,"registerId":"commonwealth-F2006B10406-current","compilationNumber":null,"startDate":"2026-04-03","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/HS 125/127 Amdt 1 - Cabin and Toilet Fluorescent Lighting","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)  \nBritish Aerospace BAe 125 Series Aeroplanes\n\nAD/HS 125/127\n\nAmdt 1\n\n  \nCabin and Toilet Fluorescent Lighting 9/92\n\nApplicability: All HS 125 aircraft specified in the Requirement Document. Requirement: IAW CAA (UK) mandatory BAe SB SB.33-45-25A027A&B Revision 2.\n\nCompliance: As specified in the Requirement Document with a revised compliance date of 31 September 1992 for Australian registered aircraft.\n\nBackground: This modification introduces power units with an integral circuit for system fault protection. The units will provide protection against faults which may cause overheating of components, wiring. Amendment 1 is issued to reflect a revision in the Requirement Document which renders the compliance with Mandatory Inspection SB.33-43 and requirement for repeat inspection in the Maintenance Schedule no longer necessary.","sortOrder":0}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a narrow, technical amendment to a specific airworthiness directive. Amendment 1 slightly streamlines the original directive by removing redundant inspection requirements, but does not expand scope beyond the original purpose of ensuring safe cabin lighting in HS 125 aircraft."},"complexity_factors":["Very short document (under 200 words)","Only 1 defined term (IAW — 'In Accordance With')","Single technical requirement referencing an external standard (UK CAA Service Bulletin)","No nested conditions or exceptions","Straightforward compliance pathway: install new part by deadline, inspections no longer required","Minimal cross-referencing (only to external UK aviation safety document)"],"plain_english_summary":"This is an **Airworthiness Directive** — essentially a mandatory safety order for aircraft owners and operators. It applies to **British Aerospace BAe 125 series aircraft** (a type of business jet).\n\n**What it does:**\n- Requires owners to install **upgraded power units** for the cabin and toilet fluorescent lighting systems\n- These new units have built-in safety circuits that prevent electrical faults from causing overheating, which could damage wiring or create fire risks\n\n**Why it changed (Amendment 1):**\n- The original directive required ongoing inspections of the old lighting system\n- This update **removes that inspection requirement** because the new power units make those checks unnecessary — once you install the upgrade, you're done\n\n**Who must comply:**\n- All Australian-registered HS 125 aircraft\n- Deadline: 31 September 1992 (note: this appears to be a typo in the original — September only has 30 days)\n\n**Why it matters:**\nElectrical faults in aircraft lighting can cause fires at 35,000 feet. This directive prevents that by mandating safer equipment and reducing ongoing maintenance burden for operators who comply."},"flash_summary":{"complexity_score":6,"scope_assessment":{"changed":true,"description":"Yes. Amendment 1 alters the maintenance scope established by the original Requirement Document: it introduces the modification (installation of protected power units) and, as a consequence of the Requirement Document revision, removes the need to comply with Mandatory Inspection SB.33-43 and to carry repeat inspections in the Maintenance Schedule (Amendment 1; Background). In practical terms this changes the ongoing inspection obligations into a directed modification obligation with a specified compliance date (Requirement; Compliance)."},"complexity_factors":["Reference to an external, technical Service Bulletin (CAA (UK) BAe SB SB.33-45-25A027A&B Revision 2) rather than containing full instructions in the AD itself (Requirement).","Applicability defined by a separate Requirement Document rather than fully listed in the AD (Applicability).","Technical installation of power units with integrated fault-protection circuitry (Background) — requires qualified maintenance organisations.","Change in maintenance regime: removal of a previously mandatory inspection and repeat inspections (Amendment 1) alters compliance calculations and record-keeping.","Fixed compliance date for Australian registered aircraft (Compliance), requiring coordination of scheduling and resources.","Narrowly specified compliance pathway with limited stated alternatives, increasing procedural rigidity (Requirement; Compliance)."],"plain_english_summary":"This AD requires specified British Aerospace HS 125 aeroplanes to be modified per the CAA (UK) mandatory Service Bulletin to install power units with integral circuit protection that prevents lighting-wire/component overheating. Australian-registered aircraft must comply by 31 September 1992. Amendment 1 removes a previously mandatory inspection and its repeat schedule. Owners/operators bear the one‑off parts and labour cost, and maintenance organisations must carry out the modification and update records to remain compliant."}},"importantCases":[],"_links":{"self":"/api/acts/ad-hs-125-127-amdt-1-cabin-and-toilet-fluorescent-lighting","history":"/api/acts/ad-hs-125-127-amdt-1-cabin-and-toilet-fluorescent-lighting/history","analysis":"/api/acts/ad-hs-125-127-amdt-1-cabin-and-toilet-fluorescent-lighting/analysis","conflicts":"/api/acts/ad-hs-125-127-amdt-1-cabin-and-toilet-fluorescent-lighting/conflicts","importantCases":"/api/acts/ad-hs-125-127-amdt-1-cabin-and-toilet-fluorescent-lighting/important-cases","documents":"/api/acts/ad-hs-125-127-amdt-1-cabin-and-toilet-fluorescent-lighting/documents"}}