{"id":"F2006B06938","name":"AD/SF340/1 - Nacelle Forward Drag Strut Fittings Bolt - Inspection","slug":"ad-sf340-1-nacelle-forward-drag-strut-fittings-bolt-inspection","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":114829,"registerId":"commonwealth-F2006B06938-current","compilationNumber":null,"startDate":"2026-04-03","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/SF340/1 - Nacelle Forward Drag Strut Fittings Bolt - Inspection","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)  SAAB SF340 Series Aeroplanes\n\n \n\nAD/SF340/1 Nacelle Forward Drag Strut Fittings Bolt - Inspection\n\n\n5/85\n\nTX\n\n \n\nApplicability: All models SF 340.\n\n \n\nRequirement: SAAB-FAIRCHILD  SF340-54A-003.\n\n \n\nCompliance: Prior to 29 March 1985.\n\n \n\nBackground: The manufacturer reports that improperly torqued bolts may have been installed.\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\n \n","sortOrder":0}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, time-bound safety directive with no legislative evolution. It addresses a specific manufacturing defect and does not represent scope creep from any original broader purpose."},"complexity_factors":["Extremely short document — only 8 substantive lines","No defined terms section — all language is plain technical aviation terminology","No cross-references to other legislation — only references a single manufacturer service bulletin","No conditional logic or nested exceptions — single straightforward requirement","Single applicability criterion (all SF340 models)","Binary compliance requirement (comply by fixed date or don't fly)"],"plain_english_summary":"**What this is:** This is an **Airworthiness Directive (AD)** — a mandatory safety order issued by Australia's Civil Aviation Safety Authority (CASA) requiring specific maintenance action on certain aircraft.\n\n**What it does:** It orders owners and operators of **SAAB SF340 series aeroplanes** (a type of regional turboprop aircraft) to inspect the **nacelle forward drag strut fittings bolt** — that's a bolt in the engine housing structure that helps secure the engine to the wing.\n\n**Why it matters:** The manufacturer discovered that some bolts may have been installed with incorrect torque (tightness). A loose or improperly tightened bolt in this critical structural fitting could lead to engine mounting problems, potentially causing serious safety issues in flight.\n\n**Who must comply:** Anyone operating SAAB SF340 aircraft in Australia.\n\n**What must be done:** Follow the manufacturer's service bulletin **SAAB-FAIRCHILD SF340-54A-003** (a technical instruction document) to inspect and fix the bolt issue.\n\n**Deadline:** The inspection had to be completed **before 29 March 1985**.\n\n**Key point:** This is a **time-critical safety mandate**. Non-compliance means the aircraft cannot legally fly."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The text sets a one-time inspection requirement for all SF340 models to be completed by a specified date, citing a manufacturer report of possibly incorrectly torqued bolts (Applicability, Requirement, Compliance, Background). There is no indication in the provided text that the AD's scope was altered from its stated purpose."},"complexity_factors":["Single, discrete requirement: one inspection action referenced to a single manufacturer document (Requirement).","Clear applicability to all SF340 models—broad subject but narrow task (Applicability).","Fixed compliance deadline creates scheduling pressure but no continuing compliance regime (Compliance).","Substantive technical detail is externalised to SAAB-FAIRCHILD SF340-54A-003, requiring implementers to obtain and follow that document (Requirement).","No enforcement, remediation, or follow-up procedures are set out in the text, reducing internal procedural complexity but increasing reliance on external regulatory practice (Schedule heading / general context)."],"plain_english_summary":"All Saab SF340 owners/operators must carry out a one‑time inspection of the nacelle forward drag strut fitting bolt following SAAB‑FAIRCHILD SF340‑54A‑003 to check for improperly torqued bolts. The check must be completed before 29 March 1985 and will impose inspection, downtime and repair costs on operators, who may use authorised maintenance organisations to comply."}},"importantCases":[],"_links":{"self":"/api/acts/ad-sf340-1-nacelle-forward-drag-strut-fittings-bolt-inspection","history":"/api/acts/ad-sf340-1-nacelle-forward-drag-strut-fittings-bolt-inspection/history","analysis":"/api/acts/ad-sf340-1-nacelle-forward-drag-strut-fittings-bolt-inspection/analysis","conflicts":"/api/acts/ad-sf340-1-nacelle-forward-drag-strut-fittings-bolt-inspection/conflicts","importantCases":"/api/acts/ad-sf340-1-nacelle-forward-drag-strut-fittings-bolt-inspection/important-cases","documents":"/api/acts/ad-sf340-1-nacelle-forward-drag-strut-fittings-bolt-inspection/documents"}}