{"id":"F2006B06785","name":"AD/SC7/1 - Left Front Engine Shockmount - Inspection and Replacement","slug":"ad-sc7-1-left-front-engine-shockmount-inspection-and-replacement","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":114633,"registerId":"commonwealth-F2006B06785-current","compilationNumber":null,"startDate":"2026-04-03","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/SC7/1 - Left Front Engine Shockmount - Inspection and Replacement","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 SC7 (Skyvan) Series Aeroplanes\n\n \n\n# AD/SC7/1 Left Front Engine Shockmount - Inspection\n\nand Replacement Applicability: All models of series 3 not incorporating Mod. 763. Document:              Short SB No. 71-50.\n\n# 6/69\n\nCompliance: 1. Inspect in accordance with Part 1 of SB No. 71-50 at intervals not exceeding 100 hours time in service until modified to Part 2.\n\n \n\n2. Modify in accordance with Part 2 of SB No. 71-50 before exceeding 1500 hours total time in service.\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 discrete, targeted safety directive focused on a specific mechanical component on a specific aircraft type. It has not expanded beyond its original purpose of addressing the left front engine shockmount issue."},"complexity_factors":["Very short document (under 200 words)","Only 2 compliance requirements with clear time thresholds","Single defined applicability criterion (Series 3 models without Mod. 763)","No nested exceptions or conditional logic","References only one external document (Short SB No. 71-50)","Straightforward temporal compliance structure (100-hour intervals / 1500-hour deadline)"],"plain_english_summary":"This is an **Airworthiness Directive (AD)** issued by Australia's Civil Aviation Safety Authority (CASA). It mandates safety inspections and modifications for a specific aircraft part on **Short SC7 Skyvan aeroplanes**.\n\n**What it does:**\n- Requires owners/operators to **inspect the left front engine shockmount** (a component that absorbs vibration from the engine) at regular intervals\n- Eventually requires **replacement or modification** of this part with an improved design\n\n**Who it affects:**\n- Owners and operators of **Short SC7 Series 3 Skyvan aircraft** that have **not** been modified according to \"Mod. 763\"\n\n**What must be done:**\n- **Inspections:** Check the shockmount every **100 hours of flight time** until the modification is done\n- **Modification:** Install the improved shockmount design **before the aircraft reaches 1,500 total flight hours**\n\n**Why it matters:**\nEngine shockmounts are critical safety components. If they fail, the engine could detach or cause catastrophic damage. This directive prevents accidents by catching wear early and ensuring older aircraft get upgraded parts.\n\n**Key terms explained:**\n- **Airworthiness Directive (AD):** A legally binding safety order from aviation regulators\n- **Service Bulletin (SB):** Technical instructions from the manufacturer (Short Brothers) on how to fix a problem\n- **Time in service:** Actual flight hours (not just calendar time)"},"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":false,"description":"The instrument sets inspection and modification requirements for a specific subset of Short SC7 series 3 aeroplanes and does not indicate an expansion or narrowing of scope compared with any prior text within this document. It prescribes recurring inspections under Part 1 of SB No. 71-50 until the Part 2 modification is installed and requires completion of the Part 2 modification before 1,500 hours TIS (Applicability; Document: Short SB No. 71-50; Compliance 1–2). No text in the supplied instrument indicates a change from an earlier scope."},"complexity_factors":["Narrow applicability: applies only to Short SC7 series 3 aeroplanes that do not incorporate Mod. 763 (Applicability).","External-document dependency: requires following two distinct parts of Short SB No. 71-50 (Document: Short SB No. 71-50), so comprehension depends on that bulletin's detail and any drawings/parts lists it contains.","Simple temporal requirements: recurring inspection interval capped at 100 hours TIS and a single modification deadline before 1,500 hours TIS (Compliance 1–2).","Recordkeeping requirement: operators must track hours time in service accurately to meet inspection intervals and the modification deadline (Compliance 1–2).","Operational logistics: need to schedule inspections and a one-off modification, and secure parts/maintenance capacity — practical complexity rather than legal complexity (Document: Short SB No. 71-50)."],"plain_english_summary":"This AD applies to Short SC7 (Skyvan) series 3 aeroplanes not incorporating Mod. 763: operators must inspect the left front engine shockmount at intervals no longer than 100 hours TIS per Part 1 of Short SB No. 71-50, and complete the Part 2 modification before the aircraft exceeds 1,500 hours TIS. It affects owners/operators and maintenance providers; operators bear inspection and modification costs and must track TIS to comply."}},"importantCases":[],"_links":{"self":"/api/acts/ad-sc7-1-left-front-engine-shockmount-inspection-and-replacement","history":"/api/acts/ad-sc7-1-left-front-engine-shockmount-inspection-and-replacement/history","analysis":"/api/acts/ad-sc7-1-left-front-engine-shockmount-inspection-and-replacement/analysis","conflicts":"/api/acts/ad-sc7-1-left-front-engine-shockmount-inspection-and-replacement/conflicts","importantCases":"/api/acts/ad-sc7-1-left-front-engine-shockmount-inspection-and-replacement/important-cases","documents":"/api/acts/ad-sc7-1-left-front-engine-shockmount-inspection-and-replacement/documents"}}