{"id":"F2006B09290","name":"AD/DIMO/2 - Aileron Control System Push Rods","slug":"ad-dimo-2-aileron-control-system-push-rods","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":53359,"registerId":"commonwealth-F2006B09290-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\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 CASR 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\n![](image.001.png)  \n\nDiamond HK-36 Series Aeroplanes","sortOrder":0},{"sectionNumber":"AD/DIMO/2 Aileron Control System Push Ro","sectionType":"part","heading":"AD/DIMO/2 Aileron Control System Push Rods 11/2003","content":"# AD/DIMO/2 Aileron Control System Push Rods 11/2003\n\nDM\n\nApplicability: All Model HK 36, HK 36 R, HK 36 TC, HK 36 TS, HK 36 TTC, HK 36 TTS, and HK 36 TTC-ECO aircraft.\n\nRequirement: 1. Inspect the long aileron push rods in both wings in accordance with Diamond Aircraft Industries Service Bulletin No. MSB36-72, dated 1 February 2002.\n\n2. Modify the long aileron pushrods in accordance with Diamond Aircraft Industries Work Instruction No. WI-MSB36-72, revision 0, dated 1 February 2002.\n\nIf damage or cracks are found during any inspection, before further flight, accomplish requirement 2.\n\nNote: Austrian CAA AD No. 111 refers.\n\nCompliance: 1. Unless the initial inspection is already accomplished, before further flight after 10 September 2003; thereafter at each scheduled inspection, until Requirement 2 is accomplished.\n\n2. Before 30 October 2003, unless already accomplished.\n\nThis Airworthiness Directive becomes effective on 10 September 2003.\n\nBackground: Deformation and cracking has been found in the long spanwise aileron pushrod, due to contact with the support for the aileron bellcrank. Failure of the aileron pushrod could result in decreased control and lead to aeroelastic flutter.\n\n![Signature of David Villiers, Delegate of the Civil Aviation Safety Authority.](image.002.png)  \n\nDavid Villiers\n\nDelegate of the Civil Aviation Safety Authority 4 September 2003\n\n![](image.001.png)","sortOrder":1}],"analysis":{"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":false,"description":"The AD is narrowly targeted at a specific unsafe condition (deformation/cracking of the long aileron pushrod) on a defined group of HK-36 series aircraft. It requires inspection and modification to correct that condition and does not broaden to other systems, additional aircraft types, or unrelated regulatory purposes. The Directive therefore stays within the original safety-remediation scope described in its Background and Requirements."},"complexity_factors":["Short, single-issue Directive focused on one component (aileron pushrods)","Two principal mandatory actions: inspect (Service Bulletin MSB36-72) and modify (Work Instruction WI-MSB36-72)","Simple conditional logic: if cracks/damage found then modify before further flight; otherwise inspect until modification completed","Two clear compliance deadlines (initial inspection before next flight after 10 Sep 2003; modification by 30 Oct 2003)","Cross-references to two external manufacturer documents (service bulletin and work instruction) and to an Austrian CAA AD","No lengthy definitions section, no nested exceptions or multiple interlocking Parts"],"plain_english_summary":"**What this instrument does**\n\n- This is an Airworthiness Directive (a mandatory safety order) issued under CASR subregulation 39.1(1). It requires operators of certain Diamond HK-36 gliders to inspect and, if necessary, modify the long aileron pushrods (the rods that transmit pilot inputs to the ailerons).\n\n**Who it applies to**\n\n- All Diamond Aircraft HK-36 series aeroplanes listed in the Applicability section: Model HK 36, HK 36 R, HK 36 TC, HK 36 TS, HK 36 TTC, HK 36 TTS, and HK 36 TTC-ECO. (Applicability)\n\n**What you must do, and when**\n\n- Inspect: Carry out an inspection of the long aileron pushrods in both wings following Diamond Aircraft Industries Service Bulletin No. MSB36-72 (dated 1 Feb 2002). (Requirement 1)\n  - If you have not already done the initial inspection, it must be done before the next flight after 10 September 2003; and then at every scheduled inspection thereafter until the modification is completed. (Compliance 1)\n\n- Modify: Modify the long aileron pushrods in accordance with Diamond Aircraft Industries Work Instruction WI-MSB36-72 (revision 0, dated 1 Feb 2002). (Requirement 2)\n  - The modification must be completed by 30 October 2003, unless already done. (Compliance 2)\n\n- If any damage or cracks are found during inspection, the modification must be carried out before the aircraft flies again. (Requirement note)\n\n**Why it matters (safety background and mechanical risk)**\n\n- The Directive was issued because deformation and cracking were found in the long-span aileron pushrod where it contacted the aileron bellcrank support. (Background)\n- If a pushrod fails in service it could reduce roll control and potentially lead to aeroelastic flutter — a condition that can lead to rapid control loss. (Background)\n\n**Who pays and who decides**\n\n- Aircraft owners/operators pay for inspections, parts and labour to do the modification, and for any downtime while work is done. The CASA delegate issuing the AD sets the requirement and compliance dates (signature and authority are on the Directive).\n\n**How the rule changes behaviour and choices**\n\n- Operators must add the specified inspection and modification tasks into their maintenance activity for each listed aircraft. They cannot lawfully continue to operate affected aircraft past the stated dates without complying. If a crack is found, the aircraft must be grounded until fixed.\n\n**Implementation considerations, costs and risks**\n\n- Compliance cost components: inspection labour, possible replacement parts or modification kits, and aircraft downtime (opportunity cost while grounded). (Requirement / Compliance)\n- Timing risk: the Directive imposes a short window between required inspection and the mandated modification date, which may concentrate demand for parts or competent maintenance facilities in that interval.\n- Supply/contract choice: operators may need to use Diamond-approved instructions or approved maintenance organisations to perform the modification; independent maintenance providers can participate if they follow the referenced service bulletin/work instruction and applicable approval processes.\n- Enforcement and operational risk: failure to comply leaves the unsafe condition unaddressed and may make the aircraft unairworthy under CASR; the AD itself is the legal instrument requiring correction.\n\n**Reference notes**\n\n- The AD cross-references Diamond Service Bulletin MSB36-72 and Work Instruction WI-MSB36-72 for the detailed inspection and modification steps. It also notes an equivalent Austrian CAA AD (No. 111). (Requirement / Note)\n\n\n"},"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 aircraft series. There is no evidence of scope creep; it targets exactly the safety issue identified in the background (aileron push rod cracking) with precisely tailored requirements."},"complexity_factors":["Very short document (approximately 300 words)","Only 2 substantive requirements with clear conditional logic (if damage found, do X before flight)","Simple applicability section listing specific aircraft models","No defined terms section or complex cross-referencing to other legislation","Single background explanation with straightforward causal chain","Clear compliance dates and repetitive inspection intervals","References only one external technical document (Service Bulletin) and one related foreign directive"],"plain_english_summary":"Owners/operators of Diamond HK‑36 gliders must inspect and, if needed, modify/replace the long aileron push rods after reports they can rub, bend and crack against a support bracket. Cracked rods risk loss of control or dangerous flutter. Inspections are required per Diamond MSB/WI, with modification mandated by the deadline; if cracks are found the aircraft must not fly until repaired."},"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-dimo-2-aileron-control-system-push-rods","history":"/api/acts/ad-dimo-2-aileron-control-system-push-rods/history","analysis":"/api/acts/ad-dimo-2-aileron-control-system-push-rods/analysis","conflicts":"/api/acts/ad-dimo-2-aileron-control-system-push-rods/conflicts","importantCases":"/api/acts/ad-dimo-2-aileron-control-system-push-rods/important-cases","documents":"/api/acts/ad-dimo-2-aileron-control-system-push-rods/documents"}}