{"id":"F2006B05628","name":"AD/PA-28/71 - Nose Landing Gear Down Lock - Modification or Replacement","slug":"ad-pa-28-71-nose-landing-gear-down-lock-modification-or-replacement","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":135276,"registerId":"commonwealth-F2006B05628-current","compilationNumber":null,"startDate":"2026-04-03","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/PA-28/71 - Nose Landing Gear Down Lock - Modification or 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-28 Series Aeroplanes\n\n \n\nAD/PA-28/71 Nose Landing Gear Down Lock - Modification\n\nor Replacement\n\n\n11/78\n\n \n\nApplicability: Models PA-28R-201 with S/Nos. 28R-7737001 to 28R-7737137, PA-28R-201T with S/Nos. 28R-7703001 to 28R-7803285.\n\n \n\nDocument: Piper SB No. 578B.\n\n \n\nCompliance: Within 100 hours time in service after 31 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\n \n\n \n","sortOrder":0}],"analysis":{"kimi_summary":{"_metrics":{"model":"kimi-k2.5","source":"moonshot-batch","completionTokens":1173},"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"The directive remains a narrow, technical safety mandate focused solely on the nose landing gear down lock modification for the specified Piper aircraft models. It has not expanded beyond its original mechanical safety purpose."},"complexity_factors":["Single discrete compliance action required","Limited applicability restricted to specific aircraft serial number ranges","No nested exceptions, conditional clauses, or alternative compliance methods","Direct reference to only one external technical document (Piper SB 578B)","Extremely brief regulatory text with minimal defined terms"],"plain_english_summary":"**What this law does:**\nThis Airworthiness Directive (AD) mandates a safety fix for the nose landing gear on specific Piper Arrow aircraft models.\n\n**Who it affects:**\nOwners and operators of:\n*   Piper PA-28R-201 aircraft (serial numbers 28R-7737001 to 28R-7737137)\n*   Piper PA-28R-201T aircraft (serial numbers 28R-7703001 to 28R-7803285)\n\n**What must be done:**\nThe aircraft's **nose landing gear down lock** (the mechanism that secures the front wheel in the \"down and locked\" position for landing) must be either modified or replaced according to the instructions in **Piper Service Bulletin No. 578B**.\n\n**Deadline:**\nThe work had to be completed within **100 hours of flight time** after 31 December 1978.\n\n**Why it matters:**\nThis directive addresses a specific safety defect to prevent potential landing gear failures, which could cause the nose wheel to collapse during landing or ground operations."}},"importantCases":[],"_links":{"self":"/api/acts/ad-pa-28-71-nose-landing-gear-down-lock-modification-or-replacement","history":"/api/acts/ad-pa-28-71-nose-landing-gear-down-lock-modification-or-replacement/history","analysis":"/api/acts/ad-pa-28-71-nose-landing-gear-down-lock-modification-or-replacement/analysis","conflicts":"/api/acts/ad-pa-28-71-nose-landing-gear-down-lock-modification-or-replacement/conflicts","importantCases":"/api/acts/ad-pa-28-71-nose-landing-gear-down-lock-modification-or-replacement/important-cases","documents":"/api/acts/ad-pa-28-71-nose-landing-gear-down-lock-modification-or-replacement/documents"}}