{"id":"F2006B10541","name":"AD/HS 125/98 - Electrical Power - Starting - Hartman Contactor","slug":"ad-hs-125-98-electrical-power-starting-hartman-contactor","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":116345,"registerId":"commonwealth-F2006B10541-current","compilationNumber":null,"startDate":"2026-04-03","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/HS 125/98 - Electrical Power - Starting - Hartman Contactor","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)  British Aerospace BAe 125 Series Aeroplanes\n\n \n\nAD/HS 125/98 Electrical Power - Starting - Hartman Contactor 3/89\n\nApplicability: 1. All BAe 125 series aircraft with Garrett TFE 731 engines.\n\n \n\n2. Series 700 aircraft pre mod 256990 (cold start battery series contactor; Aircraft with post mod 252817 part F (SB 24-237-2817) embodied; Series 600 aircraft S/No 256070.\n\n \n\nRequirement: 1. Applicable to 1. above. Action in accordance with BAe SB 24-268-3223A and B Revision 1 part A.\n\n \n\n2. Applicable to 2. above. Action in accordance with BAe SB 24-268-3223A and B Revision 1 part B.\n\n \n\nCompliance: Prior to 22 June 1989.\n\n \n\nBackground: Overheating and short circuit to earth can occur with this type of relay.\n\n \n","sortOrder":0}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":3,"scope_assessment":{"changed":false,"description":"This is a discrete, time-bound safety directive with a single, specific purpose. It has not expanded beyond its original intent of mandating a specific electrical system repair on identified aircraft."},"complexity_factors":["Short, single-purpose directive (approximately 150 words)","Only 2 defined applicability groups with cross-references to manufacturer service bulletins","Simple conditional structure: 'if your aircraft matches X, do Y'","No nested exceptions or legislative cross-references to other statutes","Technical complexity is moderate (requires understanding of aircraft modifications and service bulletins) but legal structure is straightforward"],"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 inspections on aircraft.\n\n**What it does:**\nOrders owners and operators of certain British Aerospace BAe 125 series business jets to fix a dangerous electrical fault in the engine starting system. The problem involves a \"Hartman Contactor\" (a heavy-duty electrical switch/relay used to connect the battery to the starter motor) that can overheat and short-circuit to the aircraft's metal frame (\"earth\").\n\n**Who it affects:**\n- All BAe 125 series aircraft with Garrett TFE 731 engines\n- Specific Series 700 and 600 aircraft identified by serial numbers and modification status (pre-modification 256990, or those with a specific earlier modification 252817 part F installed)\n\n**What must be done:**\nOperators must follow specific British Aerospace Service Bulletins (SB 24-268-3223A and B, Revision 1) — technical instructions that tell mechanics exactly how to inspect and repair the fault. Different parts of the service bulletin apply to different aircraft groups.\n\n**Why it matters:**\nAn electrical short circuit during engine starting could cause fire, loss of electrical power, or damage to critical systems. The directive gave operators a hard deadline (before 22 June 1989) to complete the fix.\n\n**In short:** If you owned one of these corporate jets in 1989, CASA forced you to fix a faulty battery relay before it could catch fire or fail catastrophically."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The directive as written applies to the specific BAe 125 aircraft sets identified and requires the actions in the named BAe Service Bulletin parts by the stated date. There is no indication in the provided text that the scope was broadened or narrowed beyond those explicit applicability and requirement lines (Applicability; Requirement; Compliance)."},"complexity_factors":["Technical subject matter requiring adherence to manufacturer service bulletin (external technical document referenced). (Requirement)","Multiple applicability subgroups (all BAe 125 with TFE 731 engines; separate lists for Series 700 pre-mod and Series 600 serials). (Applicability)","Reference to specific modification numbers and previous SB mod embodiment, which requires checking aircraft modification records. (Applicability)","A single fixed compliance deadline imposes scheduling urgency and potential aircraft downtime. (Compliance)","Short, prescriptive text but dependency on manufacturer SB details creates operational implementation complexity not contained in the directive itself. (Requirement)"],"plain_english_summary":"Owners/operators of specified British Aerospace BAe 125 series jets with Garrett TFE731 engines must carry out the maintenance/modification set out in BAe Service Bulletin 24-268-3223A/B Rev 1 to mitigate a relay/contactor overheating and earth‑fault risk. The work—charged to operators—must be completed by 22 June 1989, altering maintenance scheduling and causing short‑term downtime."}},"importantCases":[],"_links":{"self":"/api/acts/ad-hs-125-98-electrical-power-starting-hartman-contactor","history":"/api/acts/ad-hs-125-98-electrical-power-starting-hartman-contactor/history","analysis":"/api/acts/ad-hs-125-98-electrical-power-starting-hartman-contactor/analysis","conflicts":"/api/acts/ad-hs-125-98-electrical-power-starting-hartman-contactor/conflicts","importantCases":"/api/acts/ad-hs-125-98-electrical-power-starting-hartman-contactor/important-cases","documents":"/api/acts/ad-hs-125-98-electrical-power-starting-hartman-contactor/documents"}}