{"id":"F2006B10408","name":"AD/HS 125/129 Amdt 1 - Marking of Windshield Heat Power Supply Circuit Breakers","slug":"ad-hs-125-129-amdt-1-marking-of-windshield-heat-power-supply-circuit-breakers","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":116079,"registerId":"commonwealth-F2006B10408-current","compilationNumber":null,"startDate":"2026-04-03","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/HS 125/129 Amdt 1 - Marking of Windshield Heat Power Supply Circuit Breakers","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 125/129\n\nAmdt 1\n\n  \n\nMarking of Windshield Heat Power Supply Circuit Breakers\n\n  \n5/98\n\nApplicability: All model 125 series 800A and 800B aeroplanes.\n\nRequirement: Unless previously accomplished, incorporate “smoke drill indicator labels” in accordance with British Aerospace Service Bulletin SB.24-288-3284A dated 7 February 1992.\n\nNote: CAA(UK) AD 016-02-92 refers.\n\nCompliance: The compliance remains unchanged as “As specified in the Requirements Document with a revised effective date of 31 July 1992”.\n\nThis amendment becomes effective on 23 April 1998.\n\nBackground: This directive requires the incorporation of a modification that allows ready identification of additional circuit breakers to be included in ‘smoke drill procedures’.\n\nThis directive has been reissued at amendment 1 following the return of a BAe 125 Series 800 aeroplane to the Australian register and effectively remains unchanged, containing some minor additions such as referencing the CAA(UK) airworthiness directive and identifying the service bulletin.\n\nThe original issue of this airworthiness directive became effective on 31 July 1992.","sortOrder":0}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This amendment explicitly states it 'effectively remains unchanged' from the original 1992 directive. The only additions are minor clarifications: referencing the UK Civil Aviation Authority's equivalent directive and identifying the specific service bulletin number. The core safety requirement—labeling circuit breakers for smoke drills—has not expanded or shifted in purpose."},"complexity_factors":["Very short document (under 300 words)","Only 1 defined term implicitly referenced ('smoke drill indicator labels')","Single, unambiguous requirement with clear applicability criteria","No nested conditional logic or cross-references to other legislation beyond a single note about a UK directive","Straightforward compliance mechanism referencing an external technical document"],"plain_english_summary":"This is a safety rule for specific British Aerospace BAe 125 series aircraft (models 800A and 800B) registered in Australia. It requires aircraft owners or operators to install special labels on certain circuit breakers (switches that protect electrical circuits) that control the windshield heating system. These labels help pilots quickly identify which switches to flip during a 'smoke drill'—an emergency procedure when smoke appears in the cockpit. The labels must be installed according to a specific British Aerospace service bulletin from February 1992. This is actually a reissue of a 1992 directive, updated in 1998 after an aircraft returned to Australian registration, with minor clarifications added."},"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":false,"description":"Scope remains unchanged from the original directive. The amendment reissues the AD with minor administrative additions—explicit reference to the CAA(UK) AD and identification of the service bulletin—while retaining the original compliance requirement and effective date (Background; Compliance)."},"complexity_factors":["Narrow applicability: only BAe 125 Series 800A and 800B aeroplanes (Applicability).","Single, non-technical action required: install indicator labels (Requirement).","Dependence on an external document: BAe Service Bulletin SB.24-288-3284A is the method-of-compliance (Requirement).","Regulatory cross-reference: cites CAA(UK) AD, adding an external compliance reference (Background).","Administrative reissue rather than substantive change: amendment reissued on aircraft return to register (Background).","Compliance timing pre-set in Requirements Document and retained (Compliance)."],"plain_english_summary":"This directive requires operators of British Aerospace BAe 125 Series 800A and 800B aeroplanes to install \"smoke drill indicator\" labels identifying the windshield-heat power supply circuit breakers, following BAe Service Bulletin SB.24-288-3284A (Requirement; Applicability). The Civil Aviation Safety Authority issues the requirement; aircraft operators or their maintenance providers must perform and pay for the labelling per the Requirements Document (Compliance — revised effective date 31 July 1992). The change amends cockpit markings only, creating a modest compliance task reliant on the referenced service bulletin."}},"importantCases":[],"_links":{"self":"/api/acts/ad-hs-125-129-amdt-1-marking-of-windshield-heat-power-supply-circuit-breakers","history":"/api/acts/ad-hs-125-129-amdt-1-marking-of-windshield-heat-power-supply-circuit-breakers/history","analysis":"/api/acts/ad-hs-125-129-amdt-1-marking-of-windshield-heat-power-supply-circuit-breakers/analysis","conflicts":"/api/acts/ad-hs-125-129-amdt-1-marking-of-windshield-heat-power-supply-circuit-breakers/conflicts","importantCases":"/api/acts/ad-hs-125-129-amdt-1-marking-of-windshield-heat-power-supply-circuit-breakers/important-cases","documents":"/api/acts/ad-hs-125-129-amdt-1-marking-of-windshield-heat-power-supply-circuit-breakers/documents"}}