{"id":"F2006B06833","name":"AD/SD3-30/31 - Flap Hydraulic Unit Brackets","slug":"ad-sd3-30-31-flap-hydraulic-unit-brackets","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":114697,"registerId":"commonwealth-F2006B06833-current","compilationNumber":null,"startDate":"2026-04-03","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/SD3-30/31 - 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 SD3-30 Series Aeroplanes\n\n \n\nAD/SD3-30/31 Flap Hydraulic Unit Brackets 2/96\n\nApplicability: All SD330 aircraft.\n\n \n\nRequirement: Action in accordance with Shorts Mandatory Service Bulletin SD330-27-34.\n\n \n\nNote: UK CAA AD 005-09-95 refers.\n\n \n\nCompliance: Unless already accomplished, an initial inspection is required before 29 February 1996; thereafter as specified in the Requirement Document.\n\n \n\nBackground:  The manufacturer received a report of exfoliation corrosion on brackets in flap hydraulic units.\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":{"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a standard, narrow airworthiness directive targeting a specific mechanical defect on a specific aircraft type. It has not expanded beyond its original safety purpose."},"complexity_factors":["Extremely short document (approximately 150 words)","No defined terms section","No cross-references to other legislation (only references a manufacturer service bulletin and a UK CAA AD)","Simple conditional logic: single applicability criterion ('All SD330 aircraft') and single compliance deadline","No nested exceptions or complex procedural requirements","Self-contained: all necessary information present in one page"],"plain_english_summary":"This is an **Airworthiness Directive (AD)** issued by Australia's Civil Aviation Safety Authority (CASA) for a specific type of aircraft: the **Short SD3-30** (also known as the Short 330), which is a small regional turboprop aeroplane.\n\n**What it does:**\n- **Orders mandatory safety inspections** of brackets inside the flap hydraulic units (the machinery that controls the wing flaps used during takeoff and landing).\n- **Why:** The manufacturer discovered **exfoliation corrosion** (a type of metal decay where layers of aluminium peel apart like pages in a book) on these brackets. This could weaken the structure and potentially cause the flaps to fail.\n\n**Who must comply:**\n- **All operators** flying Short SD330 aircraft in Australia.\n\n**What must be done:**\n- Follow the instructions in **Shorts Mandatory Service Bulletin SD330-27-34** (a technical repair notice from the manufacturer).\n- **Deadline:** The first inspection had to be completed before 29 February 1996, with ongoing checks afterwards as specified in the service bulletin.\n\n**Why it matters:**\nThis directive prevents potential catastrophic failure of the aircraft's flaps, which are critical for safe landing. It ensures corroded parts are found and replaced before they cause an accident."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The AD's scope is narrowly targeted and consistent with the stated safety concern: it applies to all SD330 aircraft and mandates compliance with a single manufacturer’s mandatory service bulletin to address reported exfoliation corrosion in flap hydraulic unit brackets. The AD does not expand beyond requiring the inspection and corrective actions set out in that service bulletin, and it sets a clear initial compliance deadline with ongoing work left to the service bulletin's specifications. (Applicability; Requirement; Compliance; Background)"},"complexity_factors":["Narrow and clear applicability: applies to a single aircraft type (All SD330 aircraft). (Applicability)","Primary action is a single cross-reference to a manufacturer’s mandatory service bulletin rather than detailed procedural text in the AD itself. (Requirement)","Fixed initial deadline with subsequent intervals delegated to the external document, creating dependence on the service bulletin for full compliance details. (Compliance; Requirement)","Technical content and scope of corrective actions are located in the service bulletin (external to the AD), so operational complexity depends on that separate document rather than the AD text. (Requirement)","Reference to a related foreign AD (UK CAA AD 005-09-95) adds a secondary point of regulatory alignment but no further procedural complexity in the AD itself. (Note)"],"plain_english_summary":"This AD makes the inspection and any corrective work in Shorts Mandatory Service Bulletin SD330-27-34 compulsory for all Shorts SD3‑30 (SD330) aircraft, with an initial inspection required before 29 February 1996 and follow‑up actions as specified in the bulletin. Issued because of reported exfoliation corrosion on flap hydraulic unit brackets, it obliges owners/operators to fund and carry out the work."}},"importantCases":[],"_links":{"self":"/api/acts/ad-sd3-30-31-flap-hydraulic-unit-brackets","history":"/api/acts/ad-sd3-30-31-flap-hydraulic-unit-brackets/history","analysis":"/api/acts/ad-sd3-30-31-flap-hydraulic-unit-brackets/analysis","conflicts":"/api/acts/ad-sd3-30-31-flap-hydraulic-unit-brackets/conflicts","importantCases":"/api/acts/ad-sd3-30-31-flap-hydraulic-unit-brackets/important-cases","documents":"/api/acts/ad-sd3-30-31-flap-hydraulic-unit-brackets/documents"}}