{"id":"F2006B02304","name":"AD/AL 60/8 - Rudder Torque Tube - Modification","slug":"ad-al-60-8-rudder-torque-tube-modification","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":41534,"registerId":"commonwealth-F2006B02304-current","compilationNumber":null,"startDate":"2026-04-01","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/AL 60/8 - Rudder Torque Tube - Modification","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)  Aermacchi - Lockheed AL 60 Series Aeroplanes\n\n \n\nAD/AL 60/8 Rudder Torque Tube - Modification 6/64\n\nApplicability: Models AL 60 and AL 60B.\n\n \n\nRequirement: Modify the rudder torque tube by drilling a 3/16 in. hole in the lower portion of the torque tube 3/8 in. above the lower bearing as shown in Figure 1 of Aeronautica Macchi Modification Bulletin No. 19.\n\n \n\nCompliance: Before 1 September 1971.\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\n \n\n \n\n \n","sortOrder":0}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":1,"scope_assessment":{"changed":false,"description":"This is a discrete, one-off airworthiness directive from 1964 addressing a specific mechanical defect in a specific aircraft type. It has not expanded beyond its original narrow scope."},"complexity_factors":["Single, specific mechanical modification described in plain language","No defined terms section","No cross-references to other legislation (only references manufacturer's bulletin)","Simple applicability test (two specific aircraft models)","Single, absolute compliance deadline","No conditional logic, exceptions, or exemptions","Extremely short document (under 150 words of substantive content)"],"plain_english_summary":"**What this is:** This is an Airworthiness Directive (AD) — essentially a mandatory safety order issued by Australia's Civil Aviation Safety Authority (CASA). Think of it like a compulsory recall notice, but for aircraft parts rather than cars.\n\n**What it requires:** Owners or operators of specific Aermacchi-Lockheed aeroplane models (the AL 60 and AL 60B) must modify the rudder torque tube — a component that helps transfer pilot pedal movements to the rudder. The modification involves drilling a small hole (3/16 inch) in a specific location (3/8 inch above the lower bearing), following the manufacturer's instructions in Modification Bulletin No. 19.\n\n**Who it affects:** Anyone who owns, operates, or maintains these particular Italian-designed utility aircraft in Australia.\n\n**Why it matters:** Airworthiness Directives are legally binding. If you don't comply by the deadline (1 September 1971), you cannot legally fly the aircraft. This specific modification likely addresses a safety issue — possibly corrosion, cracking, or lubrication problems — that could affect rudder control.\n\n**Key detail:** This directive dates from 1964 (the \"6/64\" reference) with a compliance deadline in 1971, meaning it is historical. Any surviving AL 60 aircraft in Australia should already have this modification completed."},"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":false,"description":"The text is a targeted airworthiness directive limited to a single physical modification for Models AL 60 and AL 60B. There is no language in the instrument indicating an expansion or narrowing of scope beyond that specified Applicability and Requirement. The directive prescribes one specific action and a compliance deadline; nothing in the text shows a change from that original, narrow scope."},"complexity_factors":["Narrow applicability (only AL 60 and AL 60B) reduces complexity","Single, well‑specified mechanical action (drill one hole with precise dimensions and location)","Fixed compliance deadline (before 1 September 1971) — no phased requirements","Reference to an external technical bulletin (Aeronautica Macchi Modification Bulletin No. 19) introduces a minor dependency for implementation details","Minimal administrative or procedural provisions (no alternative compliance routes, no inspection regime or personnel qualification specified)","Low regulatory discretion in the text — requirement is mandatory and prescriptive"],"plain_english_summary":"This directive requires a one‑time physical modification to the rudder torque tube on Aermacchi‑Lockheed AL 60 and AL 60B aeroplanes: drill a 3/16‑inch hole 3/8‑inch above the lower bearing (per Aeronautica Macchi Modification Bulletin No. 19). It must be completed before 1 September 1971 and is mandated by the Civil Aviation Safety Authority.\n\nOwners/operators are responsible for arranging and funding the work and for consulting the referenced bulletin for exact placement and execution."}},"importantCases":[],"_links":{"self":"/api/acts/ad-al-60-8-rudder-torque-tube-modification","history":"/api/acts/ad-al-60-8-rudder-torque-tube-modification/history","analysis":"/api/acts/ad-al-60-8-rudder-torque-tube-modification/analysis","conflicts":"/api/acts/ad-al-60-8-rudder-torque-tube-modification/conflicts","importantCases":"/api/acts/ad-al-60-8-rudder-torque-tube-modification/important-cases","documents":"/api/acts/ad-al-60-8-rudder-torque-tube-modification/documents"}}