{"id":"F2006B05403","name":"AD/PA-20/12 - Fuselage Structure, Upper Cabin - Inspection","slug":"ad-pa-20-12-fuselage-structure-upper-cabin-inspection","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":46043,"registerId":"commonwealth-F2006B05403-current","compilationNumber":null,"startDate":"2026-04-02","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/PA-20/12 - Fuselage Structure, Upper Cabin - Inspection","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)  Piper PA-20 (Pacer) Series Aeroplanes\n\n \n\nAD/PA-20/12 Fuselage Structure, Upper Cabin - Inspection 11/77\n\nApplicability: All models.\n\n \n\nRequirement: 1. Remove interior trim to expose fuselage lateral members at top of windshield, front and rear spar carry through structure and upper longerons in cabin area.\n\n \n\n2. Visually inspect the exposed structural members for corrosion and condition of protective coatings.\n\n \n\nCompliance: Initially inspect before 1 January 1979 unless inspected since 1 July 1977 and thereafter at intervals not exceeding 3 years.\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":{"_metrics":{"model":"kimi-k2.5","source":"moonshot-batch","completionTokens":1304},"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This directive maintains its original, narrow scope: a targeted safety inspection for Piper PA-20 aircraft addressing potential corrosion in the upper cabin fuselage structure. It has not expanded beyond this specific technical requirement."},"complexity_factors":["Single specific task with only two procedural steps","No cross-references to other legislation or regulations","Applicability limited to one specific aircraft model series","Clear, fixed compliance dates without nested conditional exceptions","No defined terms or interpretation section required"],"plain_english_summary":"This is a **safety directive** for owners and operators of **Piper PA-20 (Pacer) series aeroplanes**. It mandates a specific inspection of the upper cabin structure to detect corrosion before it compromises airworthiness.\n\n**What you must do:**\n- **Remove interior trim** to expose structural components at the top of the windshield, the front and rear spar carry-through (the structure that continues the wing spars through the cabin), and the upper longerons (the main longitudinal support beams running along the cabin roof).\n- **Visually inspect** these exposed metal parts for corrosion (rust) and check whether the protective coatings are still intact.\n\n**When to comply:**\n- **Initial inspection:** Must be completed before 1 January 1979, unless the aircraft was already inspected after 1 July 1977.\n- **Recurring inspections:** Every 3 years thereafter.\n\nThis ensures the aircraft's frame remains structurally sound and safe to fly."}},"importantCases":[],"_links":{"self":"/api/acts/ad-pa-20-12-fuselage-structure-upper-cabin-inspection","history":"/api/acts/ad-pa-20-12-fuselage-structure-upper-cabin-inspection/history","analysis":"/api/acts/ad-pa-20-12-fuselage-structure-upper-cabin-inspection/analysis","conflicts":"/api/acts/ad-pa-20-12-fuselage-structure-upper-cabin-inspection/conflicts","importantCases":"/api/acts/ad-pa-20-12-fuselage-structure-upper-cabin-inspection/important-cases","documents":"/api/acts/ad-pa-20-12-fuselage-structure-upper-cabin-inspection/documents"}}