{"id":"F2006B06109","name":"AD/PC-12/7 - Aileron Tie Rod Assembly","slug":"ad-pc-12-7-aileron-tie-rod-assembly","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":46860,"registerId":"commonwealth-F2006B06109-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/PC-12/7 - Aileron Tie Rod Assembly","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)  Pilatus PC-12 Series Aeroplanes\n\n \n\nAD/PC-12/7 Aileron Tie Rod Assembly 8/97\n\nApplicability: Model PC-12 and PC-12/45 aircraft, with serial numbers MSN 101 through to and including MSN 169.\n\n \n\nRequirement: Inspect and modify in accordance with Pilatus Mandatory Service Bulletin 27-001.\n\n \n\nNote: FOCA Switzerland AD HB 97-174 refers.\n\n \n\nCompliance: Unless already accomplished, before 17 October 1997.\n\n \n\nThis airworthiness directive becomes effective on 17 July 1997.\n\n \n\nBackground: A report was received where the aileron tie-rod jam-nuts, on the aileron movement chain of the control wheels, became loose.\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 defines a targeted corrective action for aircraft with serial numbers MSN 101–169 and mandates inspection and modification per Pilatus Mandatory Service Bulletin 27-001 (Applicability; Requirement). Nothing in the text amends or expands that scope beyond those explicit terms."},"complexity_factors":["Narrow applicability limited to specific models and serial numbers (Applicability)","Single mandated action type (inspect and modify) rather than multiple, interlocking duties (Requirement)","Mandatory compliance must follow an external document (Pilatus Mandatory Service Bulletin 27-001), creating dependency on manufacturer documentation (Requirement)","Fixed regulatory timeline for compliance between effective date and deadline (Effective; Compliance)","Reference to a foreign authority document (FOCA Switzerland AD HB 97-174) which adds minimal cross-jurisdictional coordination"],"plain_english_summary":"What this instrument requires (mechanics first)\n\n- A specified inspection and a modification must be carried out on certain Pilatus PC-12 aeroplanes. The work must follow the procedures laid out by the manufacturer in Pilatus Mandatory Service Bulletin 27-001 (Requirement: \"Inspect and modify in accordance with Pilatus Mandatory Service Bulletin 27-001\").\n\nWho is affected\n\n- Owners/operators of Pilatus Model PC-12 and PC-12/45 aircraft whose serial numbers are MSN 101 through MSN 169 inclusive (Applicability: \"Model PC-12 and PC-12/45 aircraft, with serial numbers MSN 101 through to and including MSN 169\").\n\nWhen it must be done\n\n- The inspection and modification must be completed before 17 October 1997 unless it has already been done. The directive became effective on 17 July 1997 (Compliance: \"...before 17 October 1997\"; Effective: \"This airworthiness directive becomes effective on 17 July 1997\").\n\nWhy the rule was issued (official rationale)\n\n- The directive records that a report was received that the aileron tie-rod jam-nuts, on the aileron movement chain of the control wheels, became loose (Background: \"A report was received where the aileron tie-rod jam-nuts...became loose\"). The Requirement implements the manufacturer’s corrective procedure in Pilatus Mandatory Service Bulletin 27-001 and the AD references a related Swiss authority action (Note: \"FOCA Switzerland AD HB 97-174 refers\").\n\nWho pays and who decides\n\n- The direct financial cost and operational work falls on the owners/operators of the affected aircraft (Applicability). The detailed inspection and modification method is set by Pilatus via Mandatory Service Bulletin 27-001, which the AD makes mandatory (Requirement). The AD itself is issued by the Civil Aviation Safety Authority and sets the regulatory deadline (Effective; Compliance).\n\nPractical implementation notes, trade-offs and risks (source-grounded)\n\n- Compliance depends on obtaining and following Pilatus Mandatory Service Bulletin 27-001 (Requirement: \"in accordance with Pilatus Mandatory Service Bulletin 27-001\"). That creates a reliance on the manufacturer’s prescribed method and any parts or tooling it specifies.\n\n- The action applies only to a defined set of serial numbers, so the obligation and costs are narrowly concentrated on those owners/operators (Applicability).\n\n- There is a fixed compliance window between the effective date and the stated deadline; affected operators must schedule inspections and modifications within that period (Effective; Compliance).\n\n- The AD cites an international authority as related information (FOCA Switzerland AD HB 97-174), indicating coordination or parallel measures outside Australia (Note).\n\n- The document provides the required corrective action and the stated reason (jam-nuts became loose) but does not quantify costs, required parts, or labour hours; those practical details must be obtained from the Pilatus service bulletin (Requirement; Background).\n\nSections cited from the instrument: Applicability; Requirement; Note; Compliance; Effective; Background."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, targeted safety directive addressing a specific mechanical defect in a defined aircraft population. It has not expanded beyond its original purpose of mandating inspection and modification of aileron tie rod assemblies."},"complexity_factors":["Single, specific mechanical component addressed (aileron tie rod assembly)","Straightforward applicability criteria (specific aircraft model and serial number range)","Single compliance action (inspect and modify per manufacturer bulletin)","No defined terms section or complex interpretive provisions","No nested exceptions or conditional logic","Clear, fixed compliance deadline","Cross-reference to only one external document (Swiss aviation authority directive) and one manufacturer bulletin"],"plain_english_summary":"This is an **Airworthiness Directive (AD)** — essentially a mandatory safety order issued by Australia's Civil Aviation Safety Authority (CASA) for specific aircraft.\n\n**What it does:**\n- Orders owners and operators of certain **Pilatus PC-12 aircraft** (serial numbers 101 through 169) to inspect and modify the **aileron tie rod assembly** — a component in the control system that helps steer the plane using the ailerons (the hinged flaps on the wings).\n\n**Why it matters:**\n- A safety report revealed that **jam-nuts** (locking nuts that prevent bolts from loosening) on the aileron tie-rods could become loose. If these nuts fail, the pilot could lose control of the ailerons, potentially causing a crash.\n\n**What must happen:**\n- Aircraft operators must follow **Pilatus Mandatory Service Bulletin 27-001** — a technical instruction from the manufacturer — to inspect and fix the problem.\n- This had to be done **before 17 October 1997** (unless already completed).\n\n**Who it affects:**\n- Owners and operators of early-model PC-12 and PC-12/45 aircraft (specific serial numbers 101–169).\n\n**Key point:** This is a **time-critical safety mandate**. Non-compliance means the aircraft cannot legally fly."}},"importantCases":[],"_links":{"self":"/api/acts/ad-pc-12-7-aileron-tie-rod-assembly","history":"/api/acts/ad-pc-12-7-aileron-tie-rod-assembly/history","analysis":"/api/acts/ad-pc-12-7-aileron-tie-rod-assembly/analysis","conflicts":"/api/acts/ad-pc-12-7-aileron-tie-rod-assembly/conflicts","importantCases":"/api/acts/ad-pc-12-7-aileron-tie-rod-assembly/important-cases","documents":"/api/acts/ad-pc-12-7-aileron-tie-rod-assembly/documents"}}