{"id":"F2006B10413","name":"AD/HS 125/133 Amdt 2 - Electrical Power - Battery and Emergency Contactors","slug":"ad-hs-125-133-amdt-2-electrical-power-battery-and-emergency-contactors","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":116089,"registerId":"commonwealth-F2006B10413-current","compilationNumber":null,"startDate":"2026-04-03","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/HS 125/133 Amdt 2 - Electrical Power - Battery and Emergency Contactors","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 125/133\n\nAmdt 2\n\n  \n\nElectrical Power - Battery and Emergency Contactors\n\n  \n7/93\n\nApplicability: Series 700 and Series 800 aircraft specified in Corporate Jets Limited Service Bulletin SB.24-293-3501A, B, C, D, E, F & G Revision 2 dated 31 March 1993.\n\nRequirement: Modify the battery and emergency power contactors in accordance with the technical requirements of Corporate Jets Limited Service Bulletin SB.24-293-3501A, B, C, D, E, F & G Revision 2 dated 31 March 1993.\n\nNote: This Service Bulletin has been classified as Mandatory by the CAA(UK).\n\nCompliance: Prior to 31 December 1993.\n\nBackground: This Directive was originally issued following an in-service electrical overheat caused by a battery short to earth through a battery contactor. Amendment 1 was issued following a revision to the Requirement Document which introduced additional requirements for Series 700 aircraft.\n\nThis amendment is issued following a revision to the Requirement Document which introduced additional requirements for Series 800 aircraft. Compliance with the Directive will provide improved system integrity.","sortOrder":0}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":true,"description":"Originally covered only the base safety issue for unspecified models. Amendment 1 expanded to Series 700 aircraft. This Amendment 2 further expands to Series 800 aircraft, broadening the directive's reach to additional aircraft variants while maintaining the same core safety purpose."},"complexity_factors":["Single operative provision with no subsections or conditional logic","Only 2 defined references (the Service Bulletin and aircraft series)","No cross-references to other legislation or regulations beyond the parent Civil Aviation Regulations 1998","Straightforward compliance deadline with no exceptions or alternative methods","Total length under 200 words"],"plain_english_summary":"This safety order requires operators of certain British Aerospace BAe 125 business jets (Series 700 and 800) to modify battery and emergency power contactors per Service Bulletin SB.24-293-3501A-G Rev 2 to prevent battery short–induced electrical overheating and fire. The measure—previously mandated by the UK regulator and adopted in Australia—applies to aircraft listed in the bulletin and had to be completed by 31 December 1993."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":true,"description":"Scope expanded from the original directive: Amendment 1 introduced additional requirements for Series 700 aircraft, and this Amendment 2 introduced additional requirements for Series 800 aircraft, broadening the set of affected aircraft compared with the original issue."},"complexity_factors":["Narrow applicability: only BAe 125 Series 700 and 800 aircraft listed in the specified Service Bulletin are affected","External technical document dependency: requires compliance with Corporate Jets Service Bulletin SB.24-293-3501A Revision 2 (technical details not reproduced in the Directive)","Safety-critical electrical modification: work concerns battery and emergency power contactors (requires technical maintenance competence and possible parts)","Mandatory compliance deadline: a firm completion date (31 December 1993) creates scheduling and logistics constraints for operators","Regulatory cross-reference: Service Bulletin classified mandatory by CAA(UK), creating coordination between authorities","Amendment history: scope expansion via successive amendments (introduces traceability and record-checking complexity)","Compliance verification: requires record-keeping and potential regulator inspection to show conformity"],"plain_english_summary":"Mandates specified British Aerospace BAe 125 Series 700 and Series 800 aircraft be modified to alter their battery and emergency power contactors in accordance with Corporate Jets Service Bulletin SB.24-293-3501A Revision 2, to be completed by 31 December 1993. Applies to owners/operators of those aircraft, who must complete the mandated work; the directive was issued after an in‑service battery overheat (short to earth) and aims to improve electrical system integrity. The CAA(UK) has classified the Service Bulletin as mandatory."}},"importantCases":[],"_links":{"self":"/api/acts/ad-hs-125-133-amdt-2-electrical-power-battery-and-emergency-contactors","history":"/api/acts/ad-hs-125-133-amdt-2-electrical-power-battery-and-emergency-contactors/history","analysis":"/api/acts/ad-hs-125-133-amdt-2-electrical-power-battery-and-emergency-contactors/analysis","conflicts":"/api/acts/ad-hs-125-133-amdt-2-electrical-power-battery-and-emergency-contactors/conflicts","importantCases":"/api/acts/ad-hs-125-133-amdt-2-electrical-power-battery-and-emergency-contactors/important-cases","documents":"/api/acts/ad-hs-125-133-amdt-2-electrical-power-battery-and-emergency-contactors/documents"}}