{"id":"F2006B09946","name":"AD/FK-P/1 - Air By-Pass Valve - Modification","slug":"ad-fk-p-1-air-by-pass-valve-modification","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":55203,"registerId":"commonwealth-F2006B09946-current","compilationNumber":null,"startDate":"2026-04-02","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/FK-P/1 - Air By-Pass Valve - 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 - 106 CIVIL AVIATION SAFETY AUTHORITY\n\nSCHEDULE OF AIRWORTHINESS DIRECTIVES\n\n \n\n![](image.001.png)  Franklin Piston Engines\n\n \n\nAD/FK-P/1 Air By-Pass Valve - Modification NK\n\nApplicability: Model 6VS-335-A and 6VS-335-A installed in Bell and Hiller Helicopters in accordance with FAA STC SH1-512 and SH1-457 respectively.\n\n \n\nRequirement: Carson Helicopters SB No 107 and Franklin SB No 106. Compliance:  Before installation in an aircraft after 15 June 1967.\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\n \n","sortOrder":0}],"analysis":{"kimi_summary":{"_metrics":{"model":"kimi-k2.5","source":"moonshot-batch","completionTokens":2258},"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This document represents a discrete, targeted safety directive addressing a specific technical defect in specific aircraft configurations. There is no indication of scope creep; it remains focused on the air by-pass valve modification for the stated Franklin engine models."},"complexity_factors":["Very short document with only three operative sections (Applicability, Requirement, Compliance)","Single, unambiguous modification requirement","Clear applicability limited to specific engine model and helicopter combinations","Only two external references (to specific Service Bulletins)","No conditional exceptions, nested definitions, or alternative compliance methods"],"plain_english_summary":"**What this is:** An Airworthiness Directive (AD) — a mandatory safety order issued by the Civil Aviation Safety Authority requiring specific repairs or modifications to aircraft.\n\n**What it requires:** Owners or operators must modify the air by-pass valve on specific Franklin piston engines (model 6VS-335-A) when installed in Bell or Hiller helicopters. The modification must follow the instructions in Carson Helicopters Service Bulletin No. 107 and Franklin Service Bulletin No. 106.\n\n**Who it affects:** Anyone installing these specific Franklin engines (models 6VS-335-A) in Bell or Hiller helicopters under the specified FAA Supplemental Type Certificates (STC SH1-512 and SH1-457).\n\n**When:** This modification had to be completed before installing the engine in an aircraft after 15 June 1967.\n\n**Why it matters:** Airworthiness Directives are legally binding safety requirements. Non-compliance means the aircraft is not airworthy and cannot legally fly."}},"importantCases":[],"_links":{"self":"/api/acts/ad-fk-p-1-air-by-pass-valve-modification","history":"/api/acts/ad-fk-p-1-air-by-pass-valve-modification/history","analysis":"/api/acts/ad-fk-p-1-air-by-pass-valve-modification/analysis","conflicts":"/api/acts/ad-fk-p-1-air-by-pass-valve-modification/conflicts","importantCases":"/api/acts/ad-fk-p-1-air-by-pass-valve-modification/important-cases","documents":"/api/acts/ad-fk-p-1-air-by-pass-valve-modification/documents"}}