{"id":"F2006B01819","name":"AD/A109/33 - Main Rotor Blade Tip Cap - 2","slug":"ad-a109-33-main-rotor-blade-tip-cap-2","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":41017,"registerId":"commonwealth-F2006B01819-current","compilationNumber":null,"startDate":"2026-04-01","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\nAgusta A109 Series Helicopters","sortOrder":0},{"sectionNumber":"AD/A109/33 Main Rotor Blade Tip Cap - 2 ","sectionType":"part","heading":"AD/A109/33 Main Rotor Blade Tip Cap - 2 4/2003","content":"# AD/A109/33 Main Rotor Blade Tip Cap \\- 2 4/2003\n\nApplicability: Model A109E helicopters, equipped with main rotor blades part number 709-0103-01 (all dash numbers) having serial numbers up to and including 1428, preceded by code A5 or EM.\n\nRequirement: Inspect in accordance with Agusta Service Bulletin No. 109EP-1 Rev. B, dated 19 December 2000.\n\nNote: ENAC AD 2000-573 refers.\n\nCompliance: Within 10 flight hours after 17 April 2003 for the initial inspection, unless already accomplished. Inspect thereafter at intervals not to exceed 25 flight hours.\n\nThis Airworthiness Directive becomes effective on 17 April 2003.\n\nBackground: Cases of debonding of the main rotor blade tip cap have been reported. Investigation revealed extensive areas of debonding of the honeycomb core, resulting in cracks on the leading edge of the tip cap.\n\n![](image.002.jpeg)  \n\nDavid Alan Villiers\n\nDelegate of the Civil Aviation Safety Authority 4 March 2003","sortOrder":1}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This Airworthiness Directive maintains its original narrow scope: addressing a specific mechanical defect in a specific helicopter model's rotor blades. There is no evidence of scope creep; it targets exactly the safety issue identified in the background."},"complexity_factors":["Single, specific aircraft model and part number range","Straightforward inspection requirement referencing external technical document (Agusta Service Bulletin)","Simple compliance timeline: initial deadline plus recurring interval","No nested exceptions, conditional logic, or extensive defined terms","Background section provides clear safety rationale in plain language"],"plain_english_summary":"This CASA safety order requires owners/operators of Agusta A109E helicopters fitted with certain main rotor blades to inspect rotor blade tip caps for debonding that can cause leading‑edge cracks and possible blade failure. It mandates an initial check soon after the order and regular follow‑up inspections per Agusta Service Bulletin procedures. The aim is to detect and fix the defect before catastrophic rotor failure endangers aircraft and lives."},"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":false,"description":"The AD addresses the specific unsafe condition described in the Background (debonding and cracks of the rotor blade tip cap) and requires inspection of the affected blades. It does not extend beyond this safety goal or introduce additional unrelated powers or obligations. Although the instrument is titled with a suffix \"- 2\" (indicating an iterative action), its content remains narrowly focused on inspection of the same component and therefore has not grown significantly beyond its original purpose."},"complexity_factors":["Short, single-issue instrument (focuses only on one part and one inspection requirement)","One external normative reference: Agusta Service Bulletin No. 109EP-1 Rev. B (cross-reference dependency)","Simple conditional timing: initial inspection within 10 flight hours after effective date; repeat interval not to exceed 25 flight hours","Narrow applicability defined by model, part number and a limited serial number range with specific prefix requirement","No nested exceptions, few defined terms, no multi-part compliance pathways"],"plain_english_summary":"**What this instrument does (mechanically)**\n\n- Requires owners/operators of Agusta A109E helicopters that have main rotor blades with part number 709-0103-01 (any dash number) and serial numbers up to and including 1428 that are preceded by code A5 or EM to carry out inspections.\n- The inspections must follow the procedures in Agusta Service Bulletin No. 109EP-1 Rev. B dated 19 December 2000 (\"the Service Bulletin\") (Requirement).\n- The first inspection must be done within 10 flight hours after 17 April 2003, unless it has already been done. After that, inspections must be repeated at intervals not exceeding 25 flight hours (Compliance).\n- The directive is directed at that specific set of blades on Model A109E helicopters (Applicability). It became effective 17 April 2003.\n\n**Why the regulator requires this (the stated safety rationale)**\n\n- The Background paragraph states that there have been reported cases of debonding of the main rotor blade tip cap and that investigations found extensive debonding of the honeycomb core leading to cracks in the leading edge of the tip cap. The AD is issued to correct that unsafe condition.\n\n**Who is affected**\n\n- Directly affected: owners and operators of Agusta A109E helicopters fitted with the specified blades (P/N 709-0103-01, S/N ≤ 1428 with prefix A5 or EM).\n- Indirectly affected: maintenance organisations, certified engineers and inspectors who must perform the inspections and any repairs or removals prompted by inspection findings; scheduling/planning staff responsible for aircraft availability.\n\n**What the owner/operator must do, and who decides**\n\n- The operator must arrange for inspections to be carried out in accordance with the Agusta Service Bulletin within the required time windows. The Civil Aviation Safety Authority (CASA) delegate issued the AD under CAR 1998 subregulation 39.1(1); compliance with the AD is mandatory under Australian airworthiness regulation. Maintenance providers decide how to meet the Service Bulletin steps in practice (subject to their approvals and the bulletin instructions).\n\n**Costs, incentives and trade-offs (practical effects)**\n\n- Who pays: operators pay for the inspections (labour, possible materials, and any follow-up repairs or blade removals/replacements) and for aircraft downtime while inspections/repairs occur.\n- Incentives: the AD creates a clear, short-interval inspection incentive (initial within 10 flight hours; repeat ≤25 flight hours) which prioritises early detection of tip-cap debonding to reduce the risk of in-flight structural failure.\n- Operational trade-offs: the short inspection intervals can increase maintenance burden and reduce aircraft availability; operators will weigh inspection costs and downtime against safety risk avoidance.\n- Implementation risks: availability of qualified personnel and workshop slots, availability of spare parts or repair capacity if defects are found, and correct interpretation and faithful execution of the Service Bulletin. If many helicopters are affected at once, capacity constraints could delay compliance or drive up maintenance costs.\n- Effects on market participants: independent maintenance organisations that are appropriately certificated can perform the inspections and repairs (so work may flow to the MRO market). If parts or specialised repair capabilities are scarce, that may concentrate work with original-equipment repairers.\n\n**Mechanism and enforceability**\n\n- The AD imposes a mandatory inspection regime and specifies the documents (the Agusta Service Bulletin) to be followed. Non-compliance with an AD is regulated by CASA; the AD is issued under the statutory power cited (CAR 1998 subregulation 39.1(1)).\n\n**How this maps to the text**\n\n- Applicability: identifies Model A109E and the exact blade part/serial numbers to which the AD applies (Applicability).\n- Requirement: mandates inspection as per Agusta Service Bulletin No. 109EP-1 Rev. B (Requirement).\n- Compliance: sets the timing: initial inspection within 10 flight hours after 17 April 2003 and thereafter every ≤25 flight hours (Compliance).\n- Background: explains the unsafe condition—debonding and cracking of the tip cap honeycomb core (Background).\n\n**Net practical takeaway**\n\n- If you operate an Agusta A109E with the specified blades, you must schedule and pay for an initial inspection within a very short window (10 flight hours after the AD’s effective date) and then repeat inspections at most every 25 flight hours, following the Agusta Service Bulletin. The AD reduces operator discretion over inspection timing and method in order to address reported structural degradation of the blade tip cap, shifting costs and operational impact to operators and maintenance providers while aiming to reduce the safety risk described in the Background."},"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-a109-33-main-rotor-blade-tip-cap-2","history":"/api/acts/ad-a109-33-main-rotor-blade-tip-cap-2/history","analysis":"/api/acts/ad-a109-33-main-rotor-blade-tip-cap-2/analysis","conflicts":"/api/acts/ad-a109-33-main-rotor-blade-tip-cap-2/conflicts","importantCases":"/api/acts/ad-a109-33-main-rotor-blade-tip-cap-2/important-cases","documents":"/api/acts/ad-a109-33-main-rotor-blade-tip-cap-2/documents"}}