{"id":"F2006B06889","name":"AD/SD3-60/43 - Flap Hydraulic Unit Brackets","slug":"ad-sd3-60-43-flap-hydraulic-unit-brackets","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":114769,"registerId":"commonwealth-F2006B06889-current","compilationNumber":null,"startDate":"2026-04-03","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/SD3-60/43 - Flap Hydraulic Unit Brackets","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/SD3-60/43 Flap Hydraulic Unit Brackets 4/96\n\nApplicability: All SD3-60 aircraft.\n\n \n\nRequirement: Action in accordance with Shorts Service Bulletin SD360-27-24.\n\n \n\nNote: UK CAA AD 007-09-95 refers.\n\n \n\nCompliance: Unless previously carried out, in accordance with the Requirement Document with a revised effective date of 28 March 1996.\n\n \n\nBackground: The manufacturer has reported exfoliation corrosion on the flap hydraulic support brackets.\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\n \n","sortOrder":0}],"analysis":{"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The AD applies to all SD3-60 aircraft and requires the action specified in Shorts Service Bulletin SD360-27-24, with compliance tied to a revised effective date of 28 March 1996. The document contains no indication that the scope was altered from the instrument’s original stated purpose; it implements the manufacturer's corrective action for reported exfoliation corrosion on the flap hydraulic support brackets (Applicability; Requirement; Compliance; Background)."},"complexity_factors":["Mandates external document (Shorts Service Bulletin SD360-27-24) rather than containing technical detail, requiring operators to obtain and interpret another source (Requirement).","Applies to a defined, single aircraft type (All SD3-60 aircraft) which narrows scope but concentrates compliance obligations (Applicability).","Compliance is time-bound to a revised effective date, creating scheduling and recordkeeping requirements (Compliance).","Minimal procedural detail in the AD text itself increases reliance on the Service Bulletin and any regulator-approved alternatives (Requirement).","Cross-reference to a foreign regulator's AD (UK CAA) adds an external regulatory context but no additional procedural instruction within this document (Note)."],"plain_english_summary":"### What this instrument does\n- This is an airworthiness directive issued under the Commonwealth Civil Aviation Regulations (Part 39). It requires action to address a corrosion problem on a particular component of the Short SD3-60 aeroplane. (COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY)\n\n### Who it affects\n- Owners and operators of all Short SD3-60 aircraft. (Applicability)\n\n### The mechanical effect and how it works\n- The directive mandates that the operator must carry out the work set out in Shorts Service Bulletin SD360-27-24. The AD text does not include the technical steps itself; it directs operators to that Service Bulletin as the required action. (Requirement)\n- If the work has not already been done, operators must comply in accordance with the Requirement Document as revised effective 28 March 1996. (Compliance)\n\n### Why the directive was issued (purpose claim from the source)\n- The manufacturer reported exfoliation corrosion on the flap hydraulic support brackets. The AD implements the corrective action specified by the manufacturer via the Service Bulletin. (Background)\n- The AD text also cross-references a related UK CAA airworthiness directive. (Note)\n\n### Who pays, who decides, and what behaviour changes\n- Operators/owners pay for inspection and any remedial work or replacement required by the Service Bulletin, and they must schedule that work into their maintenance programme. (Applicability; Requirement; Compliance)\n- The Civil Aviation Safety Authority issues and enforces the directive under Part 39; the required technical content is specified by the manufacturer’s Service Bulletin which the AD makes mandatory. (COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105; Requirement)\n- Behaviour change: operators must obtain and follow Shorts Service Bulletin SD360-27-24 and complete the work by the stated effective date unless it has already been done. (Requirement; Compliance)\n\n### Compliance burden, implementation risk and discretion\n- Compliance burden: the AD does not set out the technical procedure in the AD itself; operators must obtain the Service Bulletin and execute its instructions. That creates a compliance task (sourcing the document, performing inspections/repairs, and recording compliance). (Requirement)\n- Implementation risk: effectiveness and practicability depend on the content and clarity of the Service Bulletin and the availability of parts and qualified maintenance resources; the AD text itself does not specify alternative means of compliance. (Requirement)\n- Bureaucratic discretion: the AD is issued by the Civil Aviation Safety Authority under Part 39; the AD prescribes mandatory compliance rather than leaving the decision to individual operators. (COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105; Requirement)\n\n### Effects on markets and private choices (source-supported observations)\n- The directive applies only to one aircraft type, so costs and required work fall on the limited set of SD3-60 operators. (Applicability)\n- Because the AD makes a manufacturer service bulletin mandatory, it reduces operator discretion over the specific corrective measure (operators must follow the SB or demonstrate an alternative acceptable to the regulator). (Requirement)\n- The work creates demand for maintenance providers and parts suppliers capable of performing the specified inspections/repairs; the AD does not itself address commercial arrangements, pricing, or competition among providers. (Requirement)\n\n### Trade-offs and opportunity costs (explicitly tied to the source)\n- The AD trades operator time and money (inspection/repair, downtime) for addressing a manufacturer-reported corrosion issue on a safety-critical bracket. The AD text identifies the corrosion problem as the reason for the mandatory action but does not quantify costs, downtime, or parts availability. (Background; Requirement)\n\nSummary of citations: Applicability (who and what aircraft), Requirement (mandated action via Shorts Service Bulletin SD360-27-24), Compliance (effective date and compliance trigger), Background (reason: exfoliation corrosion), Note (UK CAA AD reference), header (regulatory authority and Part 39)."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, targeted safety directive addressing a specific mechanical defect in a specific aircraft type. It has not expanded beyond its original purpose of mandating corrosion inspection/repair for flap hydraulic brackets."},"complexity_factors":["Extremely short document (under 200 words)","Only one substantive requirement: comply with an external service bulletin","No defined terms section","No conditional logic or nested exceptions","Single applicability criterion ('All SD3-60 aircraft')","Cross-reference to only one external document (UK CAA AD 007-09-95) and one manufacturer bulletin"],"plain_english_summary":"This is an **Airworthiness Directive (AD)** — essentially a mandatory safety order — issued by Australia's Civil Aviation Safety Authority (CASA) for a specific type of aircraft.\n\n**What it does:**\n- Requires owners and operators of **Short SD3-60 Series aeroplanes** (a regional turboprop aircraft) to inspect and potentially repair or replace the **flap hydraulic unit brackets** — metal supports that help control the aircraft's wing flaps.\n\n**Why it matters:**\n- The manufacturer discovered **exfoliation corrosion** (a type of metal decay where layers of metal flake apart, like peeling an onion) in these brackets. If left unchecked, this corrosion could weaken the brackets and potentially cause the flaps to malfunction — a serious safety risk during takeoff and landing.\n\n**Who must act:**\n- Anyone who owns or operates an SD3-60 aircraft must follow the instructions in **Shorts Service Bulletin SD360-27-24** (a technical notice from the plane's maker) by **28 March 1996** unless they've already done the work.\n\n**Key point:** This isn't optional. Airworthiness Directives are legally binding safety requirements. Ignoring them means the aircraft cannot legally fly."}},"importantCases":[],"_links":{"self":"/api/acts/ad-sd3-60-43-flap-hydraulic-unit-brackets","history":"/api/acts/ad-sd3-60-43-flap-hydraulic-unit-brackets/history","analysis":"/api/acts/ad-sd3-60-43-flap-hydraulic-unit-brackets/analysis","conflicts":"/api/acts/ad-sd3-60-43-flap-hydraulic-unit-brackets/conflicts","importantCases":"/api/acts/ad-sd3-60-43-flap-hydraulic-unit-brackets/important-cases","documents":"/api/acts/ad-sd3-60-43-flap-hydraulic-unit-brackets/documents"}}