{"id":"F2006B05702","name":"AD/PA-31/115 Amdt 1 - Main Landing Gear Forward Side Brace (PA-31T3)","slug":"ad-pa-31-115-amdt-1-main-landing-gear-forward-side-brace-pa-31t3","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":135501,"registerId":"commonwealth-F2006B05702-current","compilationNumber":null,"startDate":"2026-04-03","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/PA-31/115 Amdt 1 - Main Landing Gear Forward Side Brace (PA-31T3)","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-31 Series Aeroplanes\n\nAD/PA-31/115\n\nAmdt 1\n\n  \nMain Landing Gear Forward Side Brace (PA-31T3) 3/88\n\nApplicability: All model PA-31T3 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 on any occasion that 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 40279-16/-17 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 MLG forward side braces. Failure of a brace could lead to 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":2054},"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This amendment updates the original directive to reflect the availability of improved replacement parts (terminating action), but does not expand the scope beyond the original safety issue affecting PA-31T3 landing gear braces."},"complexity_factors":["Narrow applicability to single aircraft model variant (PA-31T3)","Clear numerical thresholds for compliance (500, 50, and 800 hour limits)","Single mechanical component focus with specific part numbers","Reference to external manufacturer service bulletin for technical details"],"plain_english_summary":"This directive requires owners and operators of Piper PA-31T3 aeroplanes to inspect the main landing gear forward side braces for cracks and to retire certain brace part numbers after a set service life, with inspections triggered early if the gear has been used above allowed speeds. Installing redesigned replacement braces (P/N 85165-02 or -03) ends the inspection requirement. It matters because brace cracking has been found and failure could cause landing gear collapse."}},"importantCases":[],"_links":{"self":"/api/acts/ad-pa-31-115-amdt-1-main-landing-gear-forward-side-brace-pa-31t3","history":"/api/acts/ad-pa-31-115-amdt-1-main-landing-gear-forward-side-brace-pa-31t3/history","analysis":"/api/acts/ad-pa-31-115-amdt-1-main-landing-gear-forward-side-brace-pa-31t3/analysis","conflicts":"/api/acts/ad-pa-31-115-amdt-1-main-landing-gear-forward-side-brace-pa-31t3/conflicts","importantCases":"/api/acts/ad-pa-31-115-amdt-1-main-landing-gear-forward-side-brace-pa-31t3/important-cases","documents":"/api/acts/ad-pa-31-115-amdt-1-main-landing-gear-forward-side-brace-pa-31t3/documents"}}