{"id":"F2006B05985","name":"AD/PA-42/19 - Main Landing Gear Upper Strut and Oleo Tube Plug","slug":"ad-pa-42-19-main-landing-gear-upper-strut-and-oleo-tube-plug","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":136194,"registerId":"commonwealth-F2006B05985-current","compilationNumber":null,"startDate":"2026-04-03","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/PA-42/19 - Main Landing Gear Upper Strut and Oleo Tube Plug","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/PA 42/19 Main Landing Gear Upper Strut and Oleo Tube Plug\n\n  \n3/90\n\nApplicability: Model PA-42-1000 Cheyenne 400/400LS S/Nos 42-5527001 and up, fitted with main landing gear upper strut housings which have exceeded 450 hours time in service.\n\nRequirement: 1. Action in accordance with Piper Mandatory SB No 912.\n\n2. Action in accordance with Piper Mandatory SB No 929.\n\nNote: New replacement housings require action only upon accumulating 450 hours time in service.\n\nCompliance: Requirement 1. Unless previously accomplished, prior to exceeding 100 hours time\n\nin service after 22 March 1990 or at the next scheduled inspection for issue of Maintenance Release after 22 March 1990, whichever occurs later.\n\nRequirement 2. Prior to exceeding 100 hours time in service after 22 March 1990, or at the next scheduled inspection for issue of Maintenance Release after 22 March 1990, whichever occurs later, and thereafter at intervals not exceeding 100 hours time in service.\n\nBackground: Compliance with SB 912 is considered mandatory by the manufacturer in order to meet a certification requirement for severe loading of main landing gear struts. SB 929 is considered mandatory to enable detection of cracks that may develop in main landing gear upper strut housings. Cracks if uncorrected could propagate, leading to loss of landing gear integrity.","sortOrder":0}],"analysis":{"kimi_summary":{"_metrics":{"model":"kimi-k2.5","source":"moonshot-batch","completionTokens":2118},"content_quality":"ok","complexity_score":3,"scope_assessment":{"changed":false,"description":"This directive remains precisely targeted at its original purpose: addressing specific structural integrity defects in Piper PA-42 landing gear components. It does not expand beyond the specific aircraft model and technical safety issue it was designed to regulate."},"complexity_factors":["Mandatory compliance with external manufacturer documents (Piper Service Bulletins 912 and 929) whose technical content is not reproduced in the directive","Conditional applicability based on accumulated flight hours (450-hour threshold for existing parts)","Dual compliance deadlines using 'whichever occurs later' logic for initial actions","Technical aviation terminology requiring specialized knowledge (oleo tube, strut housings, time in service, Maintenance Release)"],"plain_english_summary":"Owners/operators of Piper PA‑42‑1000 Cheyenne 400/400LS aircraft (SN 42‑5527001 and up) must follow a mandatory safety directive requiring manufacturer‑prescribed reinforcement/modification of the main landing gear upper strut housing and recurring inspections once strut housings exceed 450 flight hours.\n\nThis action, carried out per Piper Service Bulletins, is intended to detect and fix cracks that could lead to landing‑gear collapse on landing, preventing possible accident or serious injury."}},"importantCases":[],"_links":{"self":"/api/acts/ad-pa-42-19-main-landing-gear-upper-strut-and-oleo-tube-plug","history":"/api/acts/ad-pa-42-19-main-landing-gear-upper-strut-and-oleo-tube-plug/history","analysis":"/api/acts/ad-pa-42-19-main-landing-gear-upper-strut-and-oleo-tube-plug/analysis","conflicts":"/api/acts/ad-pa-42-19-main-landing-gear-upper-strut-and-oleo-tube-plug/conflicts","importantCases":"/api/acts/ad-pa-42-19-main-landing-gear-upper-strut-and-oleo-tube-plug/important-cases","documents":"/api/acts/ad-pa-42-19-main-landing-gear-upper-strut-and-oleo-tube-plug/documents"}}