{"id":"F2006B06763","name":"AD/SA-TP/15 - Axle Bracket and Sliding Tube Assemblies","slug":"ad-sa-tp-15-axle-bracket-and-sliding-tube-assemblies","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":114595,"registerId":"commonwealth-F2006B06763-current","compilationNumber":null,"startDate":"2026-04-03","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/SA-TP/15 - Axle Bracket and Sliding Tube Assemblies","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/15 Axle Bracket and Sliding Tube Assemblies NK\n\nApplicability: All models fitted with undercarriage P/N 1705 S/Nos. 1 to 36. Document:  Scottish Aviation Mod. No. C808.\n\nCompliance: 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\n \n","sortOrder":0}],"analysis":{"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The document defines a narrow, specific scope: all Twin Pioneer models fitted with undercarriage P/N 1705 serial numbers 1–36, to be brought into compliance immediately and in accordance with Scottish Aviation Mod. No. C808. The source text contains no indication that the scope has been expanded, narrowed or otherwise altered from an earlier stated intent; it presents a single, targeted directive with that applicability and timing."},"complexity_factors":["Narrow technical scope: applies only to undercarriage P/N 1705 S/Nos. 1–36 (Applicability line).","Immediate compliance required: “Compliance: Forthwith.” creates urgency and low discretion.","External technical detail: the AD delegates required work to Scottish Aviation Mod. No. C808 rather than setting out steps in the AD itself (Document line).","Operational impact uncertainty: the AD does not specify time allowances, parts, or work-hours, leaving practical implementation details to the referenced document and operators.","Limited textual length: the directive is short and specific, reducing legal complexity but increasing reliance on the referenced modification text for technical clarity."],"plain_english_summary":"This airworthiness directive (AD) orders immediate action on a specific undercarriage component fitted to certain British Aerospace (Scottish Aviation) Twin Pioneer aeroplanes.\n\nWhat the rule does (mechanics)\n\n- Identifies the affected part and aeroplanes: it applies to “All models fitted with undercarriage P/N 1705 S/Nos. 1 to 36.” (Applicability line). \n- Prescribes the corrective document: the work or inspection is to follow “Scottish Aviation Mod. No. C808.” (Document line).\n- Requires immediate compliance: the AD entry states “Compliance: Forthwith.” (Compliance line).\n\nWho it affects\n\n- Aircraft owners and operators of Twin Pioneer aeroplanes that have undercarriage part number 1705 with serial numbers 1–36. They are the parties required to act because the AD directs compliance for those aircraft.\n- Maintenance organisations and licensed engineers who must carry out the inspections, modifications or replacements described in Scottish Aviation Mod. No. C808.\n\nWhy it matters (practical implications)\n\n- The regulator has determined that aircraft with the listed undercarriage parts must be inspected or modified without delay (source: “Compliance: Forthwith.”). That creates an immediate legal obligation on operators of affected aircraft.\n- Who pays: operators (or aircraft owners) will bear the costs of the required work — for example, labor, replacement parts, and aircraft downtime — because the AD imposes the action on those operators (source: “Applicability: All models fitted with undercarriage P/N 1705 S/Nos. 1 to 36.” and “Compliance: Forthwith.”).\n- What must be done: operators must follow the instructions in the cited modification document (source: “Document: Scottish Aviation Mod. No. C808.”). The AD does not set out technical steps itself; it delegates the technical detail to that referenced document.\n\nOperational trade-offs, compliance burden and implementation risks\n\n- Compliance burden: immediate action can cause operational disruption (aircraft out of service for inspection or repair), and may require sourcing specific parts or specialist maintenance skills. The AD text signals immediacy but does not specify time-on-wing allowances, parts lists, or work-hours — those details are in the referenced Scottish Aviation Mod. No. C808 (source: Document line).\n- Discretion: the AD’s wording (“Compliance: Forthwith.”) leaves little to no discretion for delay; the regulator’s instruction is immediate. The AD does not itself provide alternative compliance means or exemptions in the text provided.\n- Implementation risk: if parts or qualified maintenance capacity are scarce, operators may experience delays, increased cost, or temporary grounding. The AD does not address supply or scheduling mitigations.\n\nReference to source text\n\n- Applicability: “All models fitted with undercarriage P/N 1705 S/Nos. 1 to 36.”\n- Document prescribing work: “Scottish Aviation Mod. No. C808.”\n- Timing: “Compliance: Forthwith.”\n- Header notation: the AD is titled “AD/SA-TP/15 Axle Bracket and Sliding Tube Assemblies NK.” The source text includes the letters “NK” but does not define them.\n\nSummary conclusion (descriptive)\n\nThe instrument mandates immediate compliance by operators of specifically identified Twin Pioneer aeroplanes to inspect, modify or repair axle bracket and sliding tube assemblies in accordance with a referenced modification document. It places direct costs and operational effects on those operators and requires maintenance action to the specification in Mod. No. C808."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a standalone Airworthiness Directive with no evidence of scope creep. It addresses a specific technical safety issue on a specific aircraft type, which is the standard and intended purpose of such directives. The document appears complete and focused on its original safety purpose."},"complexity_factors":["Extremely short document (approximately 150 words)","Only 2 defined elements: specific part number (1705) and serial number range (1-36)","No cross-references to other legislation or regulations beyond the parent Civil Aviation Regulations 1998","Single, unambiguous compliance requirement ('Forthwith') with no conditional logic or exceptions","Technical content refers to external engineering document (Mod. No. C808) rather than legislative complexity","Narrow, highly specific applicability (single aircraft type, specific undercarriage variant)"],"plain_english_summary":"This is an **Airworthiness Directive** (a mandatory safety order) issued by Australia's Civil Aviation Safety Authority for a specific type of aircraft: the **British Aerospace (Scottish Aviation) Twin Pioneer** series.\n\n**What it does:**\n- Requires immediate inspection or modification of the **axle bracket and sliding tube assemblies** on the aircraft's undercarriage (landing gear).\n- Applies only to aircraft with undercarriage part number 1705 with serial numbers 1 through 36.\n\n**Who it affects:**\n- Owners and operators of these specific Twin Pioneer aircraft.\n- Maintenance engineers working on these planes.\n\n**Why it matters:**\n- Airworthiness Directives are legally binding safety instructions. Non-compliance means the aircraft cannot fly legally.\n- The word \"Forthwith\" means this must be done **immediately** — there's no grace period, suggesting a serious safety risk has been identified.\n- The reference to \"Scottish Aviation Mod. No. C808\" points to a specific technical modification document that must be followed to fix the problem.\n\n**In short:** If you own one of these specific aircraft, you must ground it and fix the landing gear axle assembly right now, following the Scottish Aviation modification instructions."}},"importantCases":[],"_links":{"self":"/api/acts/ad-sa-tp-15-axle-bracket-and-sliding-tube-assemblies","history":"/api/acts/ad-sa-tp-15-axle-bracket-and-sliding-tube-assemblies/history","analysis":"/api/acts/ad-sa-tp-15-axle-bracket-and-sliding-tube-assemblies/analysis","conflicts":"/api/acts/ad-sa-tp-15-axle-bracket-and-sliding-tube-assemblies/conflicts","importantCases":"/api/acts/ad-sa-tp-15-axle-bracket-and-sliding-tube-assemblies/important-cases","documents":"/api/acts/ad-sa-tp-15-axle-bracket-and-sliding-tube-assemblies/documents"}}