{"id":"F2006B06897","name":"AD/SD3-60/50 - Emergency Brake Accumulator Mounting Structure","slug":"ad-sd3-60-50-emergency-brake-accumulator-mounting-structure","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":114777,"registerId":"commonwealth-F2006B06897-current","compilationNumber":null,"startDate":"2026-04-03","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/SD3-60/50 - Emergency Brake Accumulator Mounting Structure","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)  Short SD3-60 Series Aeroplanes\n\n \n\nAD/SD3-60/50 Emergency Brake Accumulator Mounting Structure\n\n\n1/99\n\n \n\nApplicability: All SD360 aircraft.\n\n \n\nRequirement: Action in accordance with Shorts Mandatory Service Bulletin SD360-29-06. Compliance:              Unless already accomplished, before 28 April 1999.\n\nThis Airworthiness Directive becomes effective on 28 January 1999.\n\n \n\nBackground:  The manufacturer received a report of cracking of the emergency brake accumulator mounting structure. This Directive requires an inspection to detect cracking, and, if necessary, replacement of a support bracket angle.\n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n","sortOrder":0}],"analysis":{"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The AD’s scope matches the stated purpose in the text: it applies to all SD360 aircraft and requires inspection and conditional replacement of the emergency brake accumulator mounting structure per the manufacturer’s service bulletin. The instrument neither expands nor narrows that scope beyond what the AD explicitly sets out (Applicability; Requirement; Background)."},"complexity_factors":["Clear and narrow applicability to all SD360 aircraft (Applicability)","Single, specific technical action: inspection for cracking and conditional replacement of a support bracket angle (Requirement; Background)","Dependence on an external document (Shorts Mandatory Service Bulletin SD360-29-06) for technical instructions (Requirement)","Fixed and relatively short compliance window between effective date and compliance date (This Airworthiness Directive becomes effective on 28 January 1999; Compliance)","Requires qualified maintenance personnel and parts, creating operational scheduling and logistical considerations (implied by Requirement and Background)"],"plain_english_summary":"This Airworthiness Directive (AD/SD3-60/50) requires all Short SD3-60 (SD360) aircraft to be inspected for cracking in the emergency brake accumulator mounting structure, and where cracking is found, to replace a support bracket angle. The AD directs operators to follow the procedures in Shorts Mandatory Service Bulletin SD360-29-06 (Requirement). The directive applies to every SD360 aircraft (Applicability), became effective on 28 January 1999 (This Airworthiness Directive becomes effective on 28 January 1999), and requires compliance before 28 April 1999 unless the work has already been done (Compliance). The manufacturer reported cracking of the mounting structure, which prompted this inspection-and-repair requirement (Background).\n\nWho pays and who decides\n- The aircraft owner/operator must carry out the inspection and arrange any required replacement, following the referenced service bulletin (Applicability; Requirement). This implies the owner/operator bears the direct costs of inspection and any replacement parts and labour. \n- The Civil Aviation Safety Authority issued the AD (title and structure), and the operator implements the mandatory actions by following the manufacturer’s service bulletin (Requirement).\n\nWhat the work involves and how it changes behaviour\n- Inspect the emergency brake accumulator mounting structure for cracking (Requirement; Background).\n- If cracking is detected, replace the support bracket angle as specified in the service bulletin (Requirement; Background).\n- Operators must complete this work before the compliance date unless it has already been accomplished (Compliance).\n\nPractical implementation points and risks\n- The AD depends on an external document (Shorts Mandatory Service Bulletin SD360-29-06) for technical steps and standards; operators must obtain and follow that bulletin to comply (Requirement).\n- Compliance imposes a short time window (effective 28 January 1999; compliance by 28 April 1999), which may require prioritising inspections and parts procurement to meet the deadline (This Airworthiness Directive becomes effective on 28 January 1999; Compliance).\n- The directive requires technical maintenance actions; operators need appropriately qualified maintenance personnel and the correct replacement parts to complete repairs per the service bulletin (Requirement).\n\nMechanics, not motives\n- Mechanically, the AD: (1) identifies the affected fleet (all SD360 aircraft), (2) requires an inspection for a specific structural crack risk, (3) mandates replacement of a named component if cracking is found, and (4) sets a compliance deadline and an effective date. These are explicit in the AD text (Applicability; Requirement; Compliance; This Airworthiness Directive becomes effective on 28 January 1999; Background)."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, targeted safety directive addressing a specific reported defect in a specific aircraft type. It has not expanded beyond its original purpose of mandating inspection and repair of the emergency brake accumulator mounting structure."},"complexity_factors":["Very short document (under 200 words)","Only 1 defined applicability (all SD360 aircraft)","Single compliance action with clear deadline","No nested exceptions or conditional logic","No cross-references to other legislation beyond the parent Civil Aviation Regulations 1998","Refers to external technical document (Service Bulletin) for detailed procedures rather than embedding them"],"plain_english_summary":"This is an **Airworthiness Directive (AD)** — essentially a mandatory safety order issued by Australia's Civil Aviation Safety Authority (CASA) for aircraft.\n\n**What it does:**\nOrders owners and operators of **Short SD3-60 series aircraft** (also known as Short 360 aeroplanes) to inspect the **emergency brake accumulator mounting structure** for cracks. If cracks are found, a specific support bracket must be replaced.\n\n**Who it affects:**\nAnyone who owns, operates, or maintains **Short SD3-60 aircraft** in Australia — this includes airlines, charter operators, and private owners.\n\n**Why it matters:**\nThe manufacturer (Shorts) reported that this mounting structure can develop cracks. Since the emergency brake accumulator is a critical safety component (it stores pressure for emergency braking if the main system fails), structural failure could mean losing emergency braking capability — a serious flight safety risk.\n\n**Key deadlines:**\n- **Effective date:** 28 January 1999 (when the order takes legal force)\n- **Compliance deadline:** 28 April 1999 (inspection must be done by this date unless already completed)\n\n**What must be done:**\nFollow the manufacturer's instructions in **Shorts Mandatory Service Bulletin SD360-29-06** — this document details exactly how to inspect and what to replace."}},"importantCases":[],"_links":{"self":"/api/acts/ad-sd3-60-50-emergency-brake-accumulator-mounting-structure","history":"/api/acts/ad-sd3-60-50-emergency-brake-accumulator-mounting-structure/history","analysis":"/api/acts/ad-sd3-60-50-emergency-brake-accumulator-mounting-structure/analysis","conflicts":"/api/acts/ad-sd3-60-50-emergency-brake-accumulator-mounting-structure/conflicts","importantCases":"/api/acts/ad-sd3-60-50-emergency-brake-accumulator-mounting-structure/important-cases","documents":"/api/acts/ad-sd3-60-50-emergency-brake-accumulator-mounting-structure/documents"}}