{"id":"F2006B07028","name":"AD/SKY ARROW/1 - Nose Gear Support Bulkhead","slug":"ad-sky-arrow-1-nose-gear-support-bulkhead","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":48721,"registerId":"commonwealth-F2006B07028-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.001.png)\n\n![](image.001.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.\n\nIniziative Industriali Italiane Sky Arrow 650 Series Aeroplanes","sortOrder":0},{"sectionNumber":"AD/SKY ARROW/1 Nose Gear Support Bulkhea","sectionType":"part","heading":"AD/SKY ARROW/1 Nose Gear Support Bulkhead 2/2003","content":"# AD/SKY ARROW/1 Nose Gear Support Bulkhead 2/2003\n\nDM\n\nApplicability: Model 650TC aircraft, serial numbers C001 through C004, C006 through 0008, and C011.\n\nModel 650TCN aircraft, serial numbers CN001 through CN006, and CN008. Model 650TCNS aircraft, serial numbers CNS010, CNS011, and CNS016\n\nRequirement: Inspect and modify in accordance with Iniziative Industriali Italiane Service Bulletin No. SB-C 02/02, dated 15 October 2002.\n\nNote: ENAC AD 2002-591 refers.\n\nCompliance: Inspect within 10 hours time in service after 18 December 2002, unless already accomplished.\n\nIf cracks are detected, accomplish the modification before further flight.\n\nModify at the next scheduled 100 hour maintenance inspection after 18 December 2002, or at the latest, before 30 June 2003.\n\nThis Airworthiness Directive becomes effective on 18 December 2002.\n\nBackground: The manufacturer received reports of crack initiation on the nose gear support bulkhead (STA 600) of aircraft with high operating time on grass airfields and training school aircraft affected by hard landings.\n\n![Signature of David Alan Villiers Delegate of the Civil Aviation Authority](image.002.jpeg)  \n\nDavid Alan Villiers\n\nDelegate of the Civil Aviation Safety Authority 12 December 2002\n\n![](image.001.png)","sortOrder":1}],"analysis":{"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"This AD is narrowly focused on correcting an identified unsafe condition (crack initiation in the nose gear support bulkhead) for a defined set of serial‑numbered aircraft. It does not broaden the subject matter, add unrelated obligations, or extend applicability beyond the listed aircraft and the single structural issue. Therefore it has not grown beyond its original safety‑remedial purpose; it implements a targeted inspection and modification requirement tied to the manufacturer’s service bulletin."},"complexity_factors":["Short, single‑issue AD (focus on one structural part: nose gear support bulkhead).","Applicability limited to 18 specific serial numbers across three sub‑models (concise but serialised list).","Single external technical reference: Iniziative Industriali Italiane Service Bulletin No. SB‑C 02/02 (work instructions not reproduced in the AD).","Multiple compliance timings and conditions: inspect within 10 hours TIS after effective date; if cracks found, modify before further flight; otherwise modify at next 100‑hour inspection or by a fixed calendar date (30 June 2003).","One simple conditional: presence of cracks changes urgency (before further flight).","Cross‑reference to a foreign regulator’s AD (ENAC AD 2002‑591) noted but not incorporated in full."],"plain_english_summary":"**What this directive does (mechanically)**\n\n- Requires owners/operators of specific Iniziative Industriali Italiane Sky Arrow 650-series aeroplanes (listed by model and serial number) to inspect the nose gear support bulkhead (structural station STA 600) and to carry out a modification if necessary.\n- The inspection and any modification must be done following the manufacturer’s instructions in Iniziative Industriali Italiane Service Bulletin No. SB‑C 02/02 (dated 15 October 2002). (This bulletin contains the technical steps — the AD does not repeat them.)\n- Timing rules: inspect within 10 hours time‑in‑service after 18 December 2002 (unless already done). If cracks are found, the modification must be completed before further flight. If no cracks are found, the required modification must be carried out at the next scheduled 100‑hour maintenance inspection after 18 December 2002, and in any event no later than 30 June 2003.\n\n**Who is affected**\n\n- Owners/operators of the following aircraft only: 650TC serials C001–C004, C006–C008, C011; 650TCN serials CN001–CN006, CN008; and 650TCNS serials CNS010, CNS011, CNS016. The AD does not apply to other serials or models.\n\n**Why it matters (the stated safety concern and how the AD addresses it)**\n\n- The manufacturer reported crack initiation in the nose gear support bulkhead (STA 600) on aircraft that have high hours operating from grass airfields and on training aircraft exposed to hard landings. The AD’s stated purpose is to find cracks early and to require a modification to correct the unsafe condition and prevent in‑service failures.\n\n**Who pays, who decides, and what behaviour changes**\n\n- Aircraft owners/operators pay for the inspection and any modification work and for associated downtime. The work must be performed to the manufacturer’s service bulletin — typically by a licensed maintenance organisation or appropriately certificated engineer.\n- The Civil Aviation Safety Authority (CASA), via the AD, sets the mandatory requirement and compliance deadlines. The AD defers the specific technical steps to the manufacturer’s Service Bulletin SB‑C 02/02.\n- Behaviour changes: operators must schedule an immediate short‑term inspection (within 10 hours TIS), and either ground an aircraft with detected cracks until repaired or schedule the mandatory modification into the next 100‑hour maintenance window (or by the fixed date). Operators who frequently operate from grass fields or conduct hard‑landing training may see increased inspection and repair rates.\n\n**Practical implementation notes and trade‑offs**\n\n- The AD is prescriptive on timing but relies on the Service Bulletin for the technical method. That shifts technical discretion to the manufacturer’s instructions while CASA enforces the requirement and deadlines.\n- Costs are concentrated on the listed aircraft owners/operators; the safety benefit is concentrated on the same fleet. The AD may impose downtime and parts/labour costs; if parts or qualified maintenance slots are limited, there is implementation risk and scheduling pressure, especially for flight training organisations.\n- Because the AD targets aircraft with higher grass‑field use and hard‑landing exposure (the manufacturer’s background statement), operators may respond by changing operating practices (reduce grass operations or alter training profiles) to lower recurrence risk — the AD does not mandate operational changes but creates an economic incentive to avoid repeated inspections/repairs.\n\nSource pointers from the AD text: requirement to follow SB‑C 02/02 (Requirement), inspection and modification timing (Compliance), and the background citing cracked bulkhead on grass‑field/high‑time/training aircraft (Background)."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a targeted safety directive addressing a specific mechanical defect in a small fleet of aircraft. It remains precisely scoped to its original purpose: correcting an unsafe condition in the nose gear support bulkhead of specific Sky Arrow aircraft. No scope creep is evident."},"complexity_factors":["Very short document (approximately 250 words)","Only 3 defined applicability groups (specific model/serial number combinations)","Single primary requirement with clear conditional branch (if cracks found → immediate action)","Simple compliance timeline with two alternative deadlines (next 100-hour inspection OR hard date of 30 June 2003)","No nested exceptions or complex cross-referencing — only one external reference to manufacturer's Service Bulletin and one note referencing Italian aviation authority (ENAC) directive","Clear, linear structure: Applicability → Requirement → Compliance → Background"],"plain_english_summary":"This Airworthiness Directive requires owners/operators of about 17 specific Sky Arrow 650-series aeroplanes to inspect the nose‑gear support bulkhead for cracks (within 10 flight hours after 18 Dec 2002) and to repair any cracks before further flight. A mandatory modification must follow at the next 100‑hour check or by 30 Jun 2003, per the manufacturer’s service bulletin.\n\nIt targets training/rough‑field aircraft where hard landings have caused failures and aims to prevent landing‑gear collapse and accidents."},"flash_summary_failed":{"failed":true,"reason":"A positive credit balance is required for all requests, including BYOK, so fallback providers remain available. Add credits at https://vercel.com/d?to=%2F%5Bteam%5D%2F%7E%2Fai%3Fmodal%3Dtop-up to continue.","source":"analysis-cron"}},"importantCases":[],"_links":{"self":"/api/acts/ad-sky-arrow-1-nose-gear-support-bulkhead","history":"/api/acts/ad-sky-arrow-1-nose-gear-support-bulkhead/history","analysis":"/api/acts/ad-sky-arrow-1-nose-gear-support-bulkhead/analysis","conflicts":"/api/acts/ad-sky-arrow-1-nose-gear-support-bulkhead/conflicts","importantCases":"/api/acts/ad-sky-arrow-1-nose-gear-support-bulkhead/important-cases","documents":"/api/acts/ad-sky-arrow-1-nose-gear-support-bulkhead/documents"}}