{"id":"F2006B02301","name":"AD/AL 60/5 - Wing Upper Skin Inspection at Aileron Hinge","slug":"ad-al-60-5-wing-upper-skin-inspection-at-aileron-hinge","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":41531,"registerId":"commonwealth-F2006B02301-current","compilationNumber":null,"startDate":"2026-04-01","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/AL 60/5 - Wing Upper Skin Inspection at Aileron Hinge","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 60/5 Wing Upper Skin Inspection at Aileron Hinge 6/63\n\nApplicability: Models AL 60 and AL 60B. Document:  Aermacchi Lockheed 60 SB No. 3.\n\nCompliance: At intervals not exceeding 25 hours’ time in service after 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","sortOrder":0}],"analysis":{"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":false,"description":"The AD’s scope is limited to inspecting the wing upper skin at the aileron hinge on AL 60 and AL 60B aircraft and requires inspections at intervals not exceeding 25 hours’ TIS per the referenced service bulletin. The text does not indicate any expansion or narrowing of that subject; therefore the scope remains aligned with the instrument’s stated applicability and requirements (Applicability; Document; Compliance)."},"complexity_factors":["Very narrow applicability — only AL 60 and AL 60B (Applicability).","Single, prescriptive compliance interval — every 25 hours’ TIS after a specified date (Compliance).","Relies on a single external service document for inspection procedure (Document: Aermacchi Lockheed 60 SB No. 3).","No branching conditions, exemptions, or multiple options in the AD text itself.","Historical compliance date specified (after 1 September 1971) — administrative tracking for legacy fleet."],"plain_english_summary":"### What this instrument does\n\nThis airworthiness directive (AD) requires regular inspections of the wing upper skin at the aileron hinge on Aermacchi–Lockheed AL 60 and AL 60B aeroplanes. The inspections must be carried out in accordance with the referenced service document (Aermacchi Lockheed 60 SB No. 3) and must occur at intervals not exceeding 25 hours’ time in service (TIS) after 1 September 1971. (See “Applicability”, “Document”, and “Compliance”.)\n\n### Who this affects\n\n- Owners and operators of AL 60 and AL 60B aircraft (Applicability).\n- Maintenance organisations and engineers who perform inspections and record keeping for these aircraft.\n\n### How it works mechanically\n\n- The AD cites a specific service bulletin as the inspection procedure to follow (Document: Aermacchi Lockheed 60 SB No. 3).\n- Operators must schedule and complete an inspection of the wing upper skin at the aileron hinge no less frequently than every 25 hours’ TIS, counting from 1 September 1971 (Compliance).\n- Continued airworthiness of affected aircraft depends on complying with that inspection interval and the referenced inspection steps.\n\n### Why it matters (purpose claims and practical implications)\n\n- The title and content of the AD identify the target of inspection (wing upper skin at the aileron hinge). That is the AD’s stated operational purpose; the text does not itself state an underlying defect but prescribes inspections to address whatever condition the issuer intended to manage (AD title; Applicability; Document; Compliance).\n\n- Who pays: aircraft owners/operators bear the direct costs of the inspections (labour, access, possible repair) because they must carry out or contract the inspections at the mandated interval (Compliance; Applicability).\n\n- Who decides and how: the Civil Aviation Safety Authority issued the AD as part of the Schedule of Airworthiness Directives; the AD delegates the technical method to the referenced service bulletin (Document). That bulletin determines the specific inspection steps and any corrective actions.\n\n- Behaviour changes required: operators must change their maintenance schedules to accommodate inspections at ≤25-hour intervals and must follow the referenced service bulletin when inspecting the specified area (Compliance; Document).\n\n- Compliance burden and costs: the recurring inspection interval (every 25 hours’ TIS) creates a regular maintenance cost and aircraft downtime. The service bulletin may specify tooling, inspection access, or repair criteria that affect cost and time, but those details are in the referenced document (Document).\n\n- Implementation risks and discretion: the AD prescribes interval and procedure reference but relies on the service bulletin for technique and acceptance criteria; this concentrates discretion over inspection technique in the service bulletin’s content. If the bulletin is unclear or requires specialised work, operators may need additional expertise or approvals.\n\n- Effects on private choice and market actions: operators choose how to execute and resource the inspections (in-house or contracted). Frequent inspections increase operating cost per flight hour for affected aircraft and may influence decisions about continued operation, leasing, or sale of AL 60-series aircraft.\n\n### Trade-offs and opportunity costs\n\n- The AD trades recurring maintenance cost and scheduling impact for the expected benefit of detecting conditions at the aileron hinge area. The AD text itself does not state the specific failure mode or quantified risk; it prescribes inspections as the regulatory response (AD title; Compliance; Document).\n\n- The requirement is narrowly targeted (two models and one inspection area), so the cost burden is concentrated on owners/operators of those models while the safety/airworthiness benefit (as intended by the issuer) would be concentrated among users of those aircraft.\n\n(Sections cited: Applicability; Document; Compliance.)"},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, single-issue airworthiness directive issued for a specific safety purpose. It has not expanded beyond its original scope of requiring recurring wing skin inspections on the AL 60 series aircraft. The document appears complete and unchanged from its original 1963 intent (noted as 6/63), merely reissued or continued under the 1998 Regulations framework."},"complexity_factors":["Extremely short document — approximately 100 words of substantive content","Only 2 defined applicability criteria (specific aircraft models)","Single, unambiguous compliance requirement (25-hour recurring inspection)","No cross-references to other legislation or regulations beyond the enabling authority (CAR 1998 Part 39)","No conditional logic, exceptions, or alternative compliance methods","No defined terms section — all language is technical aviation terminology but used in standard industry sense","Single source document referenced (Service Bulletin No. 3)"],"plain_english_summary":"**What this is:** This is an **Airworthiness Directive (AD)** — a mandatory safety order issued by Australia's Civil Aviation Safety Authority (CASA) under the Civil Aviation Regulations 1998.\n\n**What it requires:** Owners and operators of specific Aermacchi-Lockheed aircraft (the AL 60 and AL 60B models) must **inspect the upper skin of the wing at the aileron hinge point** every 25 hours of flight time.\n\n**Who it affects:** Anyone who owns, operates, or maintains these particular Italian-designed light aircraft in Australia.\n\n**Why it matters:** The directive was issued to prevent structural failures. The wing upper skin at the aileron hinge is a critical stress point; if cracks or damage go undetected, the wing could fail in flight. The 25-hour inspection interval is unusually frequent, suggesting this was a serious known defect requiring close monitoring.\n\n**Key details:**\n- **Applies to:** AL 60 and AL 60B aeroplanes only\n- **Compliance deadline:** Started 1 September 1971, then repeats every 25 flight hours\n- **Technical basis:** Aermacchi Lockheed Service Bulletin No. 3\n- **Reference number:** AD/AL 60/5 (also marked as 6/63, indicating it originated in June 1963)"}},"importantCases":[],"_links":{"self":"/api/acts/ad-al-60-5-wing-upper-skin-inspection-at-aileron-hinge","history":"/api/acts/ad-al-60-5-wing-upper-skin-inspection-at-aileron-hinge/history","analysis":"/api/acts/ad-al-60-5-wing-upper-skin-inspection-at-aileron-hinge/analysis","conflicts":"/api/acts/ad-al-60-5-wing-upper-skin-inspection-at-aileron-hinge/conflicts","importantCases":"/api/acts/ad-al-60-5-wing-upper-skin-inspection-at-aileron-hinge/important-cases","documents":"/api/acts/ad-al-60-5-wing-upper-skin-inspection-at-aileron-hinge/documents"}}