{"id":"F2006B05641","name":"AD/PA-28/87 - Stabilator Attach Fitting Corrosion","slug":"ad-pa-28-87-stabilator-attach-fitting-corrosion","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":135317,"registerId":"commonwealth-F2006B05641-current","compilationNumber":null,"startDate":"2026-04-03","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/PA-28/87 - Stabilator Attach Fitting Corrosion","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-28 Series Aeroplanes\n\n \n\nAD/PA-28/87 Stabilator Attach Fitting Corrosion 5/87\n\nApplicability: All models listed in Piper SB No 856. Requirement: Action in accordance with Piper SB No 856.\n\nCompliance: At the next scheduled inspection for Maintenance Release issue after 7 May 1987 and thereafter at intervals not exceeding one year.\n\n \n\nBackground:  The manufacturer reports instances of severe corrosion between the steel attach fittings and fuselage structure.\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":2066},"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"The directive maintains its original narrow scope addressing stabilator attach fitting corrosion in Piper PA-28 aircraft without expansion into unrelated airworthiness issues."},"complexity_factors":["Single operative requirement (compliance with external service bulletin)","Limited applicability to specific aircraft models only","Straightforward compliance schedule (initial inspection plus annual recurrence)","No defined terms or nested conditional logic","Minimal cross-referencing (sole reference to Piper SB No 856)"],"plain_english_summary":"This Airworthiness Directive mandates safety inspections for owners and operators of **Piper PA-28 series aircraft** (light planes commonly used for training and private aviation).\n\n**What it requires:**\n- **Inspect for corrosion** at the stabilator attach fittings — the steel brackets that connect the moveable horizontal tail surface to the fuselage\n- **Follow specific procedures** laid out in Piper Service Bulletin No. 856\n- **Timing:** Conduct the first inspection at the next scheduled maintenance check after 7 May 1987, then repeat every 12 months\n\n**Why it matters:**\nThe manufacturer identified severe corrosion occurring between the steel attachment brackets and the fuselage structure. This rust could weaken the critical connection between the tail and the aircraft body, potentially causing loss of control.\n\n**Who is affected:**\nOwners and operators of all Piper PA-28 models listed in Piper Service Bulletin No. 856."}},"importantCases":[],"_links":{"self":"/api/acts/ad-pa-28-87-stabilator-attach-fitting-corrosion","history":"/api/acts/ad-pa-28-87-stabilator-attach-fitting-corrosion/history","analysis":"/api/acts/ad-pa-28-87-stabilator-attach-fitting-corrosion/analysis","conflicts":"/api/acts/ad-pa-28-87-stabilator-attach-fitting-corrosion/conflicts","importantCases":"/api/acts/ad-pa-28-87-stabilator-attach-fitting-corrosion/important-cases","documents":"/api/acts/ad-pa-28-87-stabilator-attach-fitting-corrosion/documents"}}