{"id":"F2006B10780","name":"AD/IAI-A/6 - Horizontal Stabiliser Lower Scissors Attachment Bolt Holes","slug":"ad-iai-a-6-horizontal-stabiliser-lower-scissors-attachment-bolt-holes","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":56239,"registerId":"commonwealth-F2006B10780-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"AIRWORTHINESS DIRECTIVE","sectionType":"part","heading":"AIRWORTHINESS DIRECTIVE","content":"# AIRWORTHINESS DIRECTIVE\n\n![](image.002.png)\n\n![](image.002.png)  \nFor the reasons set out in the background section, the CASA delegate whose signature appears below issues the following Airworthiness Directive (AD) under subregulation 39.1 (1) of CAR 1998. The AD requires that the action set out in the requirement section (being action that the delegate considers necessary to correct the unsafe condition) be taken in relation to the aircraft or aeronautical product mentioned in the applicability section: (a) in the circumstances mentioned in the requirement section; and (b) in accordance with the instructions set out in the requirement section; and (c) at the time mentioned in the compliance section.","sortOrder":0},{"sectionNumber":"AD/IAI-A/6 Horizontal Stabiliser Lower S","sectionType":"part","heading":"AD/IAI-A/6 Horizontal Stabiliser Lower Scissors","content":"# AD/IAI-A/6 Horizontal Stabiliser Lower Scissors\n\nAttachment Bolt Holes\n\nApplicability: All Astra SPX aircraft, serial numbers 085 to 112.","sortOrder":1},{"sectionNumber":"5/2001","sectionType":"part","heading":"5/2001","content":"# AD/IAI-A/6 Horizontal Stabiliser Lower Scissors\n\nAttachment Bolt Holes\n\nApplicability: All Astra SPX aircraft, serial numbers 085 to 112.\n\n#   \n5/2001","sortOrder":2}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":3,"scope_assessment":{"changed":false,"description":"This appears to be the original scope of the AD — a targeted safety directive addressing a specific structural defect in a limited fleet of aircraft. No evidence of scope creep beyond the original airworthiness safety purpose."},"complexity_factors":["Single, narrow applicability (only one aircraft type, specific serial number range)","Straightforward structure: applicability, requirement, compliance sections","No nested definitions or extensive cross-referencing to other legislation","Technical but focused on one specific mechanical issue (bolt holes in one component)","Short document (appears to be 1-2 pages when complete)","Limited conditional logic — applies to all listed aircraft without complex exceptions"],"plain_english_summary":"This is an **Airworthiness Directive (AD)** — a mandatory safety order issued by the Civil Aviation Safety Authority (CASA) that requires specific maintenance action on certain aircraft.\n\n**What it does:**\n- Requires inspection and/or repair of **bolt holes** in the **lower scissors attachment** of the **horizontal stabiliser** (the tail section that keeps the aircraft level) on specific Astra SPX business jets.\n\n**Who it affects:**\n- Owners and operators of **Astra SPX aircraft with serial numbers 085 through 112**.\n\n**Why it matters:**\n- The bolt holes in this structural component were found to have an **unsafe condition** — likely cracking, corrosion, or improper manufacturing that could weaken the tail structure. If left unaddressed, this could lead to **structural failure** and loss of aircraft control.\n\n**What must happen:**\n- The aircraft must undergo the specific corrective action described in the \"requirement section\" (not fully shown here) at the time specified in the \"compliance section\".\n\n**Key point:** This is **not optional**. Airworthiness Directives are legally binding safety mandates. Non-compliance means the aircraft cannot legally fly."},"flash_summary":{"complexity_score":4,"scope_assessment":{"changed":false,"description":"Based on the supplied text alone there is no indication that the AD’s scope has been changed from its stated applicability: it applies to Astra SPX aircraft, serial numbers 085–112. The document sets the AD’s legal mechanism and applicability but does not provide material showing any expansion or narrowing of that scope beyond what is stated."},"complexity_factors":["Narrow, specific applicability to a small range of serial numbers (Astra SPX 085–112)","Delegated discretion under subregulation 39.1(1) of CAR 1998 — the CASA delegate determines the corrective action","Key operative details (Requirement and Compliance sections) are not included in the supplied text, increasing uncertainty about obligations","Technical subject matter (horizontal stabiliser lower scissors attachment bolt holes) implies specialist maintenance actions","Mandatory regulatory form with compliance timing referenced but not provided in the text"],"plain_english_summary":"What this directive does mechanically\n\n- This is an Airworthiness Directive titled “AD/IAI-A/6 Horizontal Stabiliser Lower Scissors Attachment Bolt Holes.” It applies to every Astra SPX aircraft with serial numbers 085 to 112 (Applicability section).\n- The directive is issued under the CASA delegate’s power in subregulation 39.1(1) of CAR 1998. It requires that the action set out in the AD’s Requirement section — described by the delegate as necessary to correct an unsafe condition — be carried out in the circumstances mentioned, in accordance with the instructions given, and at the time specified in the Compliance section (see the introductory paragraphs).\n\nWho is affected and who decides\n\n- The AD affects the listed Astra SPX aircraft (serials 085–112) and therefore the persons responsible for those aircraft (owners/operators). The AD creates a mandatory obligation to carry out the corrective action set out in the Requirement section for those aircraft (Applicability; Requirement and Compliance references).\n- The CASA delegate is the decision-maker: the delegate decides the corrective action that is required under subregulation 39.1(1) of CAR 1998 (introductory paragraph).\n\nWhy it matters (official rationale and how it operates)\n\n- The AD is issued to correct an unsafe condition related to the horizontal stabiliser lower scissors attachment bolt holes. The instrument states that the delegate considers the specified action necessary to correct that unsafe condition (introductory paragraph). The background section (referred to in the document) is the stated source of reasons for the directive.\n\nWhat the directive imposes in practice (costs, incentives, compliance and discretion)\n\n- The directive creates a legal obligation to perform whatever inspection, repair or other corrective action is set out in the Requirement section, and to do it by the times set out in the Compliance section (introductory paragraph). The text supplied does not include the Requirement or Compliance details, so the specific actions, deadlines and any technical instructions are not provided here.\n- Because the Requirement and Compliance details are not included in the supplied text, this summary cannot quantify the financial cost, time out of service, or exact maintenance tasks required. The concrete burdens (labour, parts, grounding time) will depend on the instructions contained in the Requirement section and the Compliance section.\n- The directive is exercised through delegated administrative power: the CASA delegate determines the action to be taken under subregulation 39.1(1) of CAR 1998, so the precise content and scope of the corrective measures depends on that delegated decision (introductory paragraph).\n\nImplementation risk and practical trade-offs\n\n- The practical effect for owners/operators is straightforward in principle: if you operate an Astra SPX with a serial number in the listed range, you must follow the AD’s Requirement and Compliance instructions once they are issued. The supplied text does not indicate whether alternatives (such as an approved equivalent level of safety or deferred compliance) are available; those would be matters for the full Requirement/Compliance text or for CASA administrative practice.\n\nSource citations (where each point comes from)\n\n- Applicability: “All Astra SPX aircraft, serial numbers 085 to 112.” (Applicability section)\n- Legal basis and decision-maker: issued by the CASA delegate under subregulation 39.1(1) of CAR 1998. (Introductory paragraph)\n- Mandatory nature and structure: “The AD requires that the action set out in the requirement section (being action that the delegate considers necessary to correct the unsafe condition) be taken … (a) in the circumstances mentioned in the requirement section; and (b) in accordance with the instructions set out in the requirement section; and (c) at the time mentioned in the compliance section.” (Introductory paragraph)\n\nLimitations of this summary\n\n- The supplied text does not include the Requirement section or the Compliance section, nor does it include the background details that explain the precise unsafe condition or the technical remedy. Because those elements are missing from the provided material, this summary describes the directive’s mandatory structure, applicability and decision-making mechanism but does not specify the technical measures, deadlines, or costs that operators will face."}},"importantCases":[],"_links":{"self":"/api/acts/ad-iai-a-6-horizontal-stabiliser-lower-scissors-attachment-bolt-holes","history":"/api/acts/ad-iai-a-6-horizontal-stabiliser-lower-scissors-attachment-bolt-holes/history","analysis":"/api/acts/ad-iai-a-6-horizontal-stabiliser-lower-scissors-attachment-bolt-holes/analysis","conflicts":"/api/acts/ad-iai-a-6-horizontal-stabiliser-lower-scissors-attachment-bolt-holes/conflicts","importantCases":"/api/acts/ad-iai-a-6-horizontal-stabiliser-lower-scissors-attachment-bolt-holes/important-cases","documents":"/api/acts/ad-iai-a-6-horizontal-stabiliser-lower-scissors-attachment-bolt-holes/documents"}}