{"id":"F2006B05979","name":"AD/PA-42/13 Amdt 1 - Main Landing Gear Forward Side Brace","slug":"ad-pa-42-13-amdt-1-main-landing-gear-forward-side-brace","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":136179,"registerId":"commonwealth-F2006B05979-current","compilationNumber":null,"startDate":"2026-04-03","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/PA-42/13 Amdt 1 - Main Landing Gear Forward Side Brace","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-42/13\n\nAmdt 1\n\n  \nMain Landing Gear Forward Side Brace 3/88\n\nApplicability: All models PA-42 series aircraft listed in the Requirement document.\n\nRequirement: Inspect and retire main landing gear forward side braces in accordance with Piper Service Bulletin 841A.\n\nCompliance: Inspect main landing gear forward side braces prior to exceeding 500 hours component time in service and thereafter at intervals not exceeding 50 hours component time in service.\n\nThis inspection is also required whenever the landing gear is operated at speeds above the maximum landing gear operating speed as specified in the applicable Aircraft Flight Manual.\n\nRetire main landing gear forward side braces P/N 57448-02/-03 upon the accumulation of 800 hours component time in service.\n\nNote: The incorporation of new improved MLG forward side brace P/N 85165-02/- 03 constitutes terminating action for the inspection and retirement requirements of this AD.\n\nBackground: Cracking has been experienced in the main landing gear foward side braces. Failure of a brace could cause landing gear collapse. This amendment reflects the manufacturer’s announcement of the availability of an improved MLG side brace.","sortOrder":0}],"analysis":{"kimi_summary":{"_metrics":{"model":"kimi-k2.5","source":"moonshot-batch","completionTokens":2152},"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This amendment maintains the original safety purpose of preventing landing gear collapse due to cracked side braces. It adds an optional terminating action (installation of improved parts) but does not expand beyond the original aircraft type or safety issue addressed in the 1988 directive."},"complexity_factors":["Single, specific mechanical component targeted (main landing gear forward side brace)","Clear hourly time-in-service thresholds (500 hours, 50-hour intervals, 800-hour life limit)","Reference to external technical document (Piper Service Bulletin 841A) for detailed inspection procedures","Specific part numbers identified for both affected and replacement components","Single conditional trigger requiring immediate inspection (landing gear overspeed event)"],"plain_english_summary":"This mandatory Airworthiness Directive requires owners/operators of Piper PA-42 Cheyenne III series aircraft to inspect the main landing gear forward side brace for cracking (initially before 500 hours TIS and then every 50 hours, plus after any gear overspeed) and to retire specific brace part numbers at 800 hours TIS. Installing the improved replacement parts permanently satisfies the AD. It prevents brace failure and possible main-gear collapse on landing."}},"importantCases":[],"_links":{"self":"/api/acts/ad-pa-42-13-amdt-1-main-landing-gear-forward-side-brace","history":"/api/acts/ad-pa-42-13-amdt-1-main-landing-gear-forward-side-brace/history","analysis":"/api/acts/ad-pa-42-13-amdt-1-main-landing-gear-forward-side-brace/analysis","conflicts":"/api/acts/ad-pa-42-13-amdt-1-main-landing-gear-forward-side-brace/conflicts","importantCases":"/api/acts/ad-pa-42-13-amdt-1-main-landing-gear-forward-side-brace/important-cases","documents":"/api/acts/ad-pa-42-13-amdt-1-main-landing-gear-forward-side-brace/documents"}}