{"id":"F2006B05779","name":"AD/PA-31/74 Amdt 1 - Hose Assembly - Inspection and Replacement","slug":"ad-pa-31-74-amdt-1-hose-assembly-inspection-and-replacement","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":135652,"registerId":"commonwealth-F2006B05779-current","compilationNumber":null,"startDate":"2026-04-03","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/PA-31/74 Amdt 1 - Hose Assembly - Inspection and Replacement","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-31/74\n\nAmdt 1\n\n\nHose Assembly - Inspection and Replacement 1/79\n\n \n\nApplicability: Models: PA-31 and PA-31-325 with S/Nos 31-7812016 to 31-7912004. PA-31-350 with S/Nos. 31-7852018 to 31- 7952006. PA-31T1 with S/Nos. 31T-7804001 to 31T-7804011 and 31T-7904002 to 31T-7904006. PA-31T with S/Nos. 31T-7720069 to 31T-7920008 and 31T-7920011 to 31T-7920012.\n\n \n\nDocument: Piper SB No. 629.\n\n \n\nCompliance: Within 25 hours time in service after 19 December 1978.\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":2197},"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This amendment appears to maintain the original technical safety scope of ensuring hose assembly integrity on the specified Piper aircraft. There is no evidence of expansion into new operational areas or aircraft types beyond the original directive's intent."},"complexity_factors":["References external technical document (Piper Service Bulletin No. 629) for detailed instructions","Applicability limited to specific aircraft models and serial number ranges","Compliance deadline calculated based on 'time in service' (flight hours) rather than calendar date only"],"plain_english_summary":"**What this is:** An Airworthiness Directive (a mandatory safety rule) issued by the Civil Aviation Safety Authority under the Civil Aviation Regulations.\n\n**Who it affects:** Owners and operators of specific Piper PA-31 series aircraft (including Navajo and Cheyenne models) with particular serial numbers manufactured between 1972 and 1979.\n\n**What it requires:** You must inspect and replace certain hose assemblies (tubes carrying fluids like fuel or hydraulic fluid) according to the instructions in Piper Service Bulletin No. 629.\n\n**When:** Within 25 hours of flight time after 19 December 1978.\n\n**Why it matters:** This prevents dangerous failures of hose assemblies that could lead to loss of control or fire. Ignoring this directive makes the aircraft unairworthy (illegal to fly)."}},"importantCases":[],"_links":{"self":"/api/acts/ad-pa-31-74-amdt-1-hose-assembly-inspection-and-replacement","history":"/api/acts/ad-pa-31-74-amdt-1-hose-assembly-inspection-and-replacement/history","analysis":"/api/acts/ad-pa-31-74-amdt-1-hose-assembly-inspection-and-replacement/analysis","conflicts":"/api/acts/ad-pa-31-74-amdt-1-hose-assembly-inspection-and-replacement/conflicts","importantCases":"/api/acts/ad-pa-31-74-amdt-1-hose-assembly-inspection-and-replacement/important-cases","documents":"/api/acts/ad-pa-31-74-amdt-1-hose-assembly-inspection-and-replacement/documents"}}