{"id":"F2006B06784","name":"AD/SA-TP/9 - Slat Jack P/N 4694 - Replacement with P/N 4477","slug":"ad-sa-tp-9-slat-jack-p-n-4694-replacement-with-p-n-4477","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":114631,"registerId":"commonwealth-F2006B06784-current","compilationNumber":null,"startDate":"2026-04-03","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/SA-TP/9 - Slat Jack P/N 4694 - Replacement with P/N 4477","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)  British Aerospace (Scottish Aviation) Twin Pioneer Series Aeroplanes\n\n \n\nAD/SA-TP/9 Slat Jack P/N 4694 - Replacement with P/N 4477 NK\n\nApplicability: S/No. 507 and subsequent. Document:  Scottish Aviation Mod. No. C403. Compliance:               Forthwith.\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\n \n\n \n","sortOrder":0}],"analysis":{"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The AD text establishes a single, specific change (replace slat jack P/N 4694 with P/N 4477) for a defined group of aircraft (serial number 507 and subsequent) and requires compliance forthwith. The text provides no indication that this scope was altered from any earlier intent; therefore there is no evidence within the supplied text of a change in scope."},"complexity_factors":["Very short, prescriptive instruction with minimal procedural detail","Limited applicability tied to a simple serial-number range (S/No. 507 and subsequent)","Immediate compliance timing (\"Forthwith\") increases operational urgency","No stated method of compliance, reporting requirements, or justification in the text","Dependence on specific part numbers (P/N 4694 and P/N 4477) creating potential supply-chain considerations"],"plain_english_summary":"This Airworthiness Directive mandates immediate replacement of slat jack P/N 4694 with P/N 4477 on British Aerospace (Scottish Aviation) Twin Pioneer aeroplanes S/N 507 and later (per Scottish Aviation Mod. No. C403).  \n\nIt affects aircraft owners/operators, maintenance organisations and parts suppliers, creating near-term costs, scheduling pressure and increased demand for P/N 4477; the AD itself gives only the replacement requirement and timing (\"forthwith\"), not methods or rationale."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, single-issue airworthiness directive focused on one specific mechanical component replacement for one aircraft type. It represents the standard, narrow scope typical of individual ADs — addressing a specific safety defect with a specific remedy. There is no evidence of scope creep; the document does exactly what its title suggests and nothing more."},"complexity_factors":["Extremely short document (approximately 100 words of substantive content)","Only one defined term implicitly referenced (the part numbers P/N 4694 and P/N 4477)","No cross-references to other legislation or regulations beyond the parenthetical mention of Civil Aviation Regulations 1998, Part 39","Simple unconditional command structure: replace X with Y, applicable to specific serial numbers, compliance required immediately","Single technical reference to Scottish Aviation Modification No. C403 with no further elaboration required","No exceptions, exemptions, or conditional logic"],"plain_english_summary":"This is an **Airworthiness Directive** (AD) — essentially a mandatory safety order issued by Australia's Civil Aviation Safety Authority (CASA).\n\n**What it does:**\nIt requires owners and operators of specific **British Aerospace (Scottish Aviation) Twin Pioneer aircraft** to replace a faulty part called a \"slat jack\" (part number 4694) with a different, approved part (part number 4477).\n\n**Who it affects:**\n- Owners and operators of Twin Pioneer aeroplanes with **serial number 507 and onwards**\n- Anyone responsible for maintaining these specific aircraft\n\n**Why it matters:**\nSlat jacks are mechanical components that help control the aircraft's leading edge slats (movable surfaces on the wings that improve lift during takeoff and landing). If this part fails, it could compromise the aircraft's ability to fly safely at low speeds. The directive uses the word \"forthwith\" — meaning **immediately** — indicating this is an urgent safety issue that cannot wait for the next scheduled maintenance.\n\n**The bottom line:** If you own one of these specific aircraft, you must swap out this particular part right away before the plane can fly."}},"importantCases":[],"_links":{"self":"/api/acts/ad-sa-tp-9-slat-jack-p-n-4694-replacement-with-p-n-4477","history":"/api/acts/ad-sa-tp-9-slat-jack-p-n-4694-replacement-with-p-n-4477/history","analysis":"/api/acts/ad-sa-tp-9-slat-jack-p-n-4694-replacement-with-p-n-4477/analysis","conflicts":"/api/acts/ad-sa-tp-9-slat-jack-p-n-4694-replacement-with-p-n-4477/conflicts","importantCases":"/api/acts/ad-sa-tp-9-slat-jack-p-n-4694-replacement-with-p-n-4477/important-cases","documents":"/api/acts/ad-sa-tp-9-slat-jack-p-n-4694-replacement-with-p-n-4477/documents"}}