{"id":"F2006B06819","name":"AD/SD3-30/18 - Fuselage Sealing","slug":"ad-sd3-30-18-fuselage-sealing","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":114683,"registerId":"commonwealth-F2006B06819-current","compilationNumber":null,"startDate":"2026-04-03","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/SD3-30/18 - Fuselage Sealing","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/SD3-30/18 Fuselage Sealing 4/86\n\nApplicability: All models with S/Nos SH3002 to SH3116. Requirement:  Short SB SD330-53-58.\n\nCompliance: Prior to 31 July 1986.\n\n \n\nBackground: Following an incident of a fuel purge valve failure, investigation indicated that, to safeguard against the possibility of fuel ingress into the main cabin, an improvement in fuselage top skin sealing is desirable.\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\n \n","sortOrder":0}],"analysis":{"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":false,"description":"The instrument does not indicate any change of scope from its stated purpose. It applies to a defined set of aircraft (S/Nos SH3002 to SH3116), requires compliance with a specific Short Service Bulletin (SD330-53-58), and sets a single completion date (31 July 1986). The AD’s stated background (fuel purge valve failure and desire to reduce fuel ingress risk) aligns with the technical requirement it imposes (\"Applicability\", \"Requirement\", \"Compliance\", \"Background\")."},"complexity_factors":["Narrow, serial-number-limited applicability (SH3002 to SH3116) reduces scope complexity (\"Applicability\").","Single prescribed remedial action is referenced by a specific service bulletin (Short SB SD330-53-58), concentrating technical detail outside the AD itself (\"Requirement\").","Fixed compliance deadline (31 July 1986) imposes a calendar constraint on operators (\"Compliance\").","Safety-critical subject matter (fuel ingress risk) raises enforcement and prioritisation importance despite administrative simplicity (\"Background\").","No alternative compliance pathway or authorised variation is mentioned in the text, leaving limited regulatory discretion within the AD as written (implicit in \"Requirement\")."],"plain_english_summary":"Requires owners/operators of Short SD3‑30 aeroplanes (serials SH3002–SH3116) to perform a fuselage top‑skin sealing modification per Short Service Bulletin SD330‑53‑58, completed by 31 July 1986. \n\nIssued after a fuel purge valve failure, the AD aims to reduce the risk of fuel entering the main cabin. Compliance is mandatory, imposing labor, materials and downtime costs on owners/operators; the SB defines the technical work but not a specific provider."},"kimi_summary":{"content_quality":"ok","complexity_score":1,"scope_assessment":{"changed":false,"description":"This is a discrete, time-bound safety directive addressing a specific mechanical issue on a specific aircraft type. It has not expanded beyond its original purpose of mandating fuselage sealing improvements following the identified fuel purge valve failure incident."},"complexity_factors":["Extremely short document (under 150 words)","No defined terms section","No cross-references to other legislation beyond a single manufacturer service bulletin reference","Simple conditional structure: applicability → requirement → compliance deadline","Single issue addressed with no exceptions or nested conditions","Straightforward command language ('Requirement: Short SB SD330-53-58')"],"plain_english_summary":"**What 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:** Requires owners and operators of specific Short SD3-30 series aeroplanes (a type of regional turboprop aircraft) to improve the sealing on the top of the fuselage (the main body of the plane).\n\n**Who it affects:** Anyone who owns or operates Short SD3-30 aircraft with serial numbers between SH3002 and SH3116.\n\n**Why it matters:** After a fuel purge valve failed on one of these planes, investigators discovered a risk that fuel could leak into the passenger cabin. This directive mandates a fix (following manufacturer's Service Bulletin SD330-53-58) to prevent fuel from seeping through the fuselage skin and potentially creating a fire hazard or exposing passengers to harmful fumes.\n\n**The deadline:** The work had to be completed before 31 July 1986.\n\n**In short:** If you owned one of these specific planes, you were legally required to get this sealing upgrade done by mid-1986 to keep your aircraft airworthy and your passengers safe."}},"importantCases":[],"_links":{"self":"/api/acts/ad-sd3-30-18-fuselage-sealing","history":"/api/acts/ad-sd3-30-18-fuselage-sealing/history","analysis":"/api/acts/ad-sd3-30-18-fuselage-sealing/analysis","conflicts":"/api/acts/ad-sd3-30-18-fuselage-sealing/conflicts","importantCases":"/api/acts/ad-sd3-30-18-fuselage-sealing/important-cases","documents":"/api/acts/ad-sd3-30-18-fuselage-sealing/documents"}}