{"id":"F2006B10429","name":"AD/HS 125/149 - Ice Protection Metering Pumps Wiring","slug":"ad-hs-125-149-ice-protection-metering-pumps-wiring","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":116121,"registerId":"commonwealth-F2006B10429-current","compilationNumber":null,"startDate":"2026-04-03","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/HS 125/149 - Ice Protection Metering Pumps Wiring","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 125/149 Ice Protection Metering Pumps Wiring 5/95\n\nDM\n\nApplicability: BAe 125 Series 800A, Series 800B, Series 1000A, Series 1000B, Hawker 800 and Hawker 1000 aircraft.\n\nRequirement: Action in accordance with Aerospace Systems and Technologies Ltd Mandatory Service Bulletin S.B.30-25 dated 27 January 1995 (Hawker Raytheon Corporate Jets Service Bulletin SB.30-61-7676A dated 15 February 1995 also refers).\n\nNote: Aerospace Systems and Technologies Service Ltd Bulletin S.B.30-25 has been classified as Mandatory by the CAA (UK).\n\nCompliance: Prior to 30 June 1995 for installed pumps or prior to being fitted to an aircraft for spare pumps.\n\nBackground: Aerospace Systems and Technologies has advised that ignition may occur when bare or defectively insulated silver plated wire carrying direct current is exposed to glycol. To avoid this risk, this Directive requires that wire with silver plated conductors is removed from the flying leads of the ice protection system metering pumps. The CAA (UK) compliance date is extended by one calendar month for Australian registered aircraft.","sortOrder":0}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete airworthiness directive addressing a specific wiring defect in specific aircraft models. It has not expanded beyond its original safety purpose."},"complexity_factors":["Single, specific technical requirement (replace specific wire type)","Only 4 defined aircraft models in applicability section","One primary compliance action with clear deadline","No nested exceptions or conditional logic","Short document (approximately 150 words)","Single cross-reference to manufacturer service bulletin"],"plain_english_summary":"This safety order requires owners/operators and maintenance organisations of certain BAe 125/Hawker 800/1000 business jets registered in Australia to remove and replace silver‑plated wiring in metering pumps of the ice‑protection/de‑icing system. The wiring can spark if exposed to glycol and damaged, risking in‑flight or ground fires. Compliance prevents those fires; installed pumps must be fixed by 30 June 1995 and spare pumps before being fitted."},"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":false,"description":"The Directive retains the narrow, model‑specific scope set out in the Requirement and Applicability. The only adjustment from the referenced UK action is a one‑calendar‑month extension to the compliance date for Australian registered aircraft; no expansion of affected aircraft, parts, or mandated actions is introduced (Applicability; Compliance; Background)."},"complexity_factors":["Narrow applicability limited to specific BAe 125 Series 800A/800B/1000A/1000B and Hawker 800/1000 models (Applicability)","Single corrective action delegated to an external Mandatory Service Bulletin (S.B.30‑25) rather than containing technical instructions in the Directive (Requirement)","Simple, fixed compliance timing (installed pumps by 30 June 1995; spares before fitting) but with a one‑month adjustment noted for Australian registered aircraft (Compliance; Background)","Safety risk stems from a single identified failure mode (ignition when silver‑plated DC conductors contact glycol), limiting scope of technical assessment (Background)"],"plain_english_summary":"Requires removal of silver‑plated conductor wiring from the flying leads of ice‑protection metering pumps on specified BAe 125 / Hawker 800/1000 aircraft by following Mandatory Service Bulletin S.B.30‑25 (Requirement; Background).\n\n*Affects aircraft owners, operators and maintenance organisations (including spare pumps): they must carry out the wiring change by 30 June 1995 for installed pumps or before fitting spares; the Directive references a CAA (UK) mandatory bulletin and gives Australian registered aircraft a one‑month compliance variation (Applicability; Compliance).*"}},"importantCases":[],"_links":{"self":"/api/acts/ad-hs-125-149-ice-protection-metering-pumps-wiring","history":"/api/acts/ad-hs-125-149-ice-protection-metering-pumps-wiring/history","analysis":"/api/acts/ad-hs-125-149-ice-protection-metering-pumps-wiring/analysis","conflicts":"/api/acts/ad-hs-125-149-ice-protection-metering-pumps-wiring/conflicts","importantCases":"/api/acts/ad-hs-125-149-ice-protection-metering-pumps-wiring/important-cases","documents":"/api/acts/ad-hs-125-149-ice-protection-metering-pumps-wiring/documents"}}