{"id":"F2006B05690","name":"AD/PA-31/104 - Elevator Outboard Hinge Installation","slug":"ad-pa-31-104-elevator-outboard-hinge-installation","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":135471,"registerId":"commonwealth-F2006B05690-current","compilationNumber":null,"startDate":"2026-04-03","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/PA-31/104 - Elevator Outboard Hinge Installation","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-31 Series Aeroplanes\n\n \n\nAD/PA-31/104 Elevator Outboard Hinge Installation 7/82\n\nApplicability: All models PA-31P with S/Nos. 31P-3 to 31P-7730012. Requirement:  Action in accordance with Piper SB No. 737.\n\nCompliance: 1. Unless already accomplished, inspect within 25 hours time in service after 3 June 1982.\n\n \n\n2.    If single piece hinge installations are installed, reinspect at intervals not exceeding 10 hours time in service until installation of kit 764381.\n\n \n\n3.    Replace single piece hinge installations by kit 764381 before 30 June 1982. Background:              The manufacturer reports failures of the single piece elevator outboard hinge.\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":1445},"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This directive maintains its original narrow scope as an urgent safety intervention for a specific mechanical defect. It has not expanded beyond addressing the reported failures of single-piece elevator outboard hinges in the defined aircraft population."},"complexity_factors":["Single-issue directive addressing one specific mechanical defect","Narrow applicability limited to specific aircraft model and serial number range","Only 3 distinct compliance requirements with clear deadlines","Minimal cross-referencing (only to manufacturer Service Bulletin No. 737 and kit number)"],"plain_english_summary":"**What this does:** This is a mandatory safety order requiring owners of specific Piper aircraft to inspect and replace faulty elevator hinges. The manufacturer identified that single-piece hinges were failing, which could cause pilots to lose control of the aircraft's up-and-down movement.\n\n**Who it affects:** Owners and operators of Piper PA-31P model aircraft with serial numbers from 31P-3 through to 31P-7730012.\n\n**What must be done:**\n- **Inspect** the elevator outboard hinges within 25 flying hours after 3 June 1982 (unless already inspected)\n- **If single-piece hinges are found:** Reinspect them every 10 flying hours until they are replaced\n- **Replace** all single-piece hinge installations with approved kit 764381 before 30 June 1982\n\n**Why it matters:** The elevator controls the aircraft's pitch (climbing and descending). Hinge failures in this critical control surface could lead to catastrophic loss of control. This directive forces a fix before the parts fail in flight."}},"importantCases":[],"_links":{"self":"/api/acts/ad-pa-31-104-elevator-outboard-hinge-installation","history":"/api/acts/ad-pa-31-104-elevator-outboard-hinge-installation/history","analysis":"/api/acts/ad-pa-31-104-elevator-outboard-hinge-installation/analysis","conflicts":"/api/acts/ad-pa-31-104-elevator-outboard-hinge-installation/conflicts","importantCases":"/api/acts/ad-pa-31-104-elevator-outboard-hinge-installation/important-cases","documents":"/api/acts/ad-pa-31-104-elevator-outboard-hinge-installation/documents"}}