{"id":"F2006B10534","name":"AD/HS 125/91 Amdt 1 - Electrical Power - Smoke Drill - Additional Circuit Breaker Identical Labels","slug":"ad-hs-125-91-amdt-1-electrical-power-smoke-drill-additional-circuit-breaker-identical-labels","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":116331,"registerId":"commonwealth-F2006B10534-current","compilationNumber":null,"startDate":"2026-04-03","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/HS 125/91 Amdt 1 - Electrical Power - Smoke Drill - Additional Circuit Breaker Identical Labels","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 125/91\n\nAmdt 1\n\n\nElectrical Power - Smoke Drill - Additional Circuit Breaker Identical Labels\n\n\n5/88\n\n \n\nApplicability: As detailed in the Requirement Document.\n\n \n\nRequirement: Action in accordance with BAe SB 24-263-9486A Revision 1 dated 27 January 1988.\n\n \n\nNote: CAA AD 002-12-87 also refers.\n\n \n\nCompliance: Before 21 July 1988.\n\n \n\nBackground: 1. BAe SB 24-263-9486A revision 1 requires installing self adhesive colour coded labels to the listed circuit breakers in compliance with airworthiness requirements.\n\n \n\n2. Amendment 1 to this AD has been issued to amend the Requirement document only.\n","sortOrder":0}],"analysis":{"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":false,"description":"Amendment 1 modifies only the Requirement Document and does not change the AD’s operative requirement to comply with BAe SB 24-263-9486A Revision 1. The AD continues to mandate installation of the specified self-adhesive colour-coded labels on listed circuit breakers, with the same compliance mechanism and deadline (Requirement; Background 2; Compliance)."},"complexity_factors":["Relies on an external service bulletin (BAe SB 24-263-9486A Rev 1) for technical detail and parts (Requirement).","Applicability is delegated to the Requirement Document rather than stated in full within the AD (Applicability).","Fixed and historical compliance deadline increases urgency for operators at the time (Compliance).","Amendment 1 modifies the Requirement Document only, so tracking which version of the Requirement Document applies is necessary (Background 2).","Reference to a related CAA AD creates an additional cross-reference for operators to consult (Note)."],"plain_english_summary":"What this instrument does\n\n- This Airworthiness Directive (AD) requires operators of the British Aerospace BAe 125 series aeroplanes listed in the associated Requirement Document to install self-adhesive, colour-coded labels on specified circuit breakers. The work must be carried out in accordance with BAe Service Bulletin (SB) 24-263-9486A Revision 1 dated 27 January 1988 (Requirement). Compliance must be completed before 21 July 1988 (Compliance). The AD also refers to a related Civil Aviation Authority AD (CAA AD 002-12-87) (Note).\n\nWhy the AD was issued (official claim)\n\n- The published Background states the service bulletin requires installing the colour-coded labels “in compliance with airworthiness requirements” (Background 1). The AD’s Amendment 1 changes only the Requirement Document (Background 2).\n\nHow it works mechanically\n\n- The AD makes compliance with BAe SB 24-263-9486A Revision 1 mandatory for the aircraft listed in the Requirement Document (Applicability; Requirement). It sets a fixed compliance deadline (Before 21 July 1988). The SB specifies what labels are to be fitted and on which circuit breakers; the AD prescribes following that SB.\n\nWho pays and who decides\n\n- Aircraft operators or the organisation responsible for the aircraft’s continuing airworthiness must implement the label installation required by the SB and therefore bear the direct costs of purchasing labels and fitting them and any labour or maintenance scheduling costs (Requirement; Compliance). The AD delegates technical detail and exact applicability to the referenced Requirement Document and BAe service bulletin (Applicability; Requirement), which determine the specific parts and aircraft.\n\nCompliance burden, discretion and practical risks\n\n- Compliance imposes a limited operational task: sourcing the specified self-adhesive, colour-coded labels and fitting them to listed circuit breakers before the compliance date (Requirement; Compliance; Background 1). The AD refers operators to an external document (the BAe SB) for the detailed steps and to the Requirement Document for the list of affected aircraft (Requirement; Applicability). That reliance places practical dependence on those external documents for scope and technical specification, and on the operator to interpret and apply them correctly.\n\nTrade-offs and likely effects on private operators and markets\n\n- The direct effect on private operators is administrative and maintenance cost for parts and labour. The measure does not change ownership, pricing structures, competition or contract freedoms; it imposes a specific maintenance action to meet an airworthiness standard (Requirement). The action is unlikely to affect broader market competition or productivity beyond the time and resources spent implementing the label installations.\n\nNotes on amendment and scope\n\n- The Amendment 1 to this AD amends only the Requirement Document and does not, in the text of the AD itself, add new types of work or a different compliance mechanism (Background 2). The AD therefore continues to require compliance with the BAe SB as its operative instruction (Requirement)."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This amendment makes a minor administrative update only (amending the Requirement document reference). The scope remains unchanged: mandatory safety labelling of circuit breakers for smoke emergency procedures."},"complexity_factors":["Very short document (under 200 words)","Only 1 substantive requirement (install labels per manufacturer bulletin)","No defined terms section","No cross-references to other legislation (only references a manufacturer service bulletin and a related UK CAA directive)","Single compliance deadline with no conditional exceptions","Amendment makes only technical administrative change to referenced document"],"plain_english_summary":"This is an **Airworthiness Directive (AD)** — essentially a mandatory safety order issued by Australia's Civil Aviation Safety Authority (CASA) for specific aircraft.\n\n**What it does:**\n- Requires owners/operators of **British Aerospace BAe 125 series aeroplanes** to install **colour-coded self-adhesive labels** on specific circuit breakers.\n- These labels help flight crews quickly identify the right circuit breakers during emergency \"smoke drill\" procedures (when smoke appears in the cockpit and electrical systems need to be shut down fast).\n\n**Why it matters:**\n- In an emergency, every second counts. If circuit breakers have **identical labels**, pilots can waste precious time figuring out which one to pull. Colour-coding removes this confusion and reduces the risk of pulling the wrong breaker — or hesitating too long.\n- The directive references a **Service Bulletin** (SB 24-263-9486A) from the manufacturer, which contains the detailed instructions.\n\n**Who must comply:**\n- Operators of the affected aircraft must complete this modification **before 21 July 1988**.\n\n**Key point about this version:**\n- This is **Amendment 1**, which only updates the \"Requirement Document\" — the core safety action (installing the labels) remains unchanged from the original 1988 directive."}},"importantCases":[],"_links":{"self":"/api/acts/ad-hs-125-91-amdt-1-electrical-power-smoke-drill-additional-circuit-breaker-identical-labels","history":"/api/acts/ad-hs-125-91-amdt-1-electrical-power-smoke-drill-additional-circuit-breaker-identical-labels/history","analysis":"/api/acts/ad-hs-125-91-amdt-1-electrical-power-smoke-drill-additional-circuit-breaker-identical-labels/analysis","conflicts":"/api/acts/ad-hs-125-91-amdt-1-electrical-power-smoke-drill-additional-circuit-breaker-identical-labels/conflicts","importantCases":"/api/acts/ad-hs-125-91-amdt-1-electrical-power-smoke-drill-additional-circuit-breaker-identical-labels/important-cases","documents":"/api/acts/ad-hs-125-91-amdt-1-electrical-power-smoke-drill-additional-circuit-breaker-identical-labels/documents"}}