{"id":"F2006B05983","name":"AD/PA-42/17 - Main Landing Gear Actuator Attachment Bolt","slug":"ad-pa-42-17-main-landing-gear-actuator-attachment-bolt","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":136188,"registerId":"commonwealth-F2006B05983-current","compilationNumber":null,"startDate":"2026-04-03","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/PA-42/17 - Main Landing Gear Actuator Attachment Bolt","content":"COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 \\- 105 CIVIL AVIATION SAFETY AUTHORITY\n\nSCHEDULE OF AIRWORTHINESS DIRECTIVES\n\n![](image.001.png)  \nPiper PA-42 (Cheyenne III) Series Aeroplanes\n\nAD/PA42/17 Main Landing Gear Actuator Attachment Bolt 8/88\n\nApplicability: PA42-1000 S/Nos 42-5527001 and subsequent. Requirement: Action in accordance with Piper SB 885.\n\nCompliance: 1. For aircraft with more than 500 hours total time in service as of 11 August 1988.\n\nPrior to the next inspection for Maintenance Release issue after 11 August 1988 and thereafter every 500 hours time in service.\n\n2. For aircraft with less than 500 hours total time in service as of 11 August 1988.\n\nPrior to achieving 500 hours total time in service and thereafter every 500 hours time in service.\n\nBackground: The manufacturer has received reports of bolt failure. Failure of this bolt could result in an inability to retract or extend the effected MLG.","sortOrder":0}],"analysis":{"kimi_summary":{"_metrics":{"model":"kimi-k2.5","source":"moonshot-batch","completionTokens":1436},"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a standard airworthiness directive addressing a specific mechanical defect in specified aircraft. The scope remains tightly focused on the single safety issue of main landing gear actuator bolt failures without expansion into unrelated systems or aircraft types."},"complexity_factors":["Single aircraft model applicability with specific serial number range","Simple binary condition based on flight hours (greater than or less than 500 hours)","Single cross-reference to external technical standard (Piper SB 885)","No defined terms section or nested conditional logic","Short, single-issue directive with clear compliance dates"],"plain_english_summary":"This directive requires owners/operators of Piper Cheyenne III (PA-42, S/N 42-5527001 and later) to inspect or replace the attachment bolt on the main landing gear actuator per Piper Service Bulletin 885. Timing depends on flight hours as of 11 Aug 1988: comply before the next maintenance release if >500 hours then every 500 hours, or before reaching 500 total hours if <500, then every 500 hours thereafter. It addresses reported bolt failures that can prevent gear extension/retraction, posing a serious safety risk."}},"importantCases":[],"_links":{"self":"/api/acts/ad-pa-42-17-main-landing-gear-actuator-attachment-bolt","history":"/api/acts/ad-pa-42-17-main-landing-gear-actuator-attachment-bolt/history","analysis":"/api/acts/ad-pa-42-17-main-landing-gear-actuator-attachment-bolt/analysis","conflicts":"/api/acts/ad-pa-42-17-main-landing-gear-actuator-attachment-bolt/conflicts","importantCases":"/api/acts/ad-pa-42-17-main-landing-gear-actuator-attachment-bolt/important-cases","documents":"/api/acts/ad-pa-42-17-main-landing-gear-actuator-attachment-bolt/documents"}}