{"id":"F2006B05703","name":"AD/PA-31/116 - Main Landing Gear Downlock Cable","slug":"ad-pa-31-116-main-landing-gear-downlock-cable","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":135502,"registerId":"commonwealth-F2006B05703-current","compilationNumber":null,"startDate":"2026-04-03","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/PA-31/116 - Main Landing Gear Downlock Cable","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-31/116 Main Landing Gear Downlock Cable 7/87\n\nApplicability: Models and serial numbers as listed in Piper Service Bulletin No 860, and having cable-type downlock actuators fitted.\n\nRequirement: Replace the existing anti-rotation stop with a stop of improved design as per Piper Service Bulletin No 860.\n\nNote: A stop may not have been previously fitted, but is required to be fitted.\n\nCompliance: Unless already accomplished, within 100 hours time in service after 30 June 1987.\n\nBackground: The manufacturer has determined that the anti-rotation stop used in conjunction with the M.L.G. downlock cable can allow the cable attach clevis bolt to rotate. Downlock cable length is thus shortened, preventing full engagement of the downlock hook assembly. Aircraft delivered with cable type downlock actuators may or may not have been fitted with anti-rotation stops.","sortOrder":0}],"analysis":{"kimi_summary":{"_metrics":{"model":"kimi-k2.5","source":"moonshot-batch","completionTokens":991},"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"The directive remains tightly scoped to the specific safety defect identified in the main landing gear downlock cable system. No evidence of scope expansion beyond the original technical safety issue."},"complexity_factors":["Single, discrete mechanical action required (replace/install one component)","Clear, narrow applicability criteria (specific aircraft models with cable-type actuators only)","External reference to one technical standard (Piper Service Bulletin No 860) for implementation details","Simple compliance deadline (100 hours time-in-service after fixed date)","No nested exceptions or conditional logic"],"plain_english_summary":"A mandatory airworthiness directive for Piper PA‑31 owners requiring installation of an improved anti‑rotation stop (per Piper Service Bulletin No. 860) on cable‑type main‑gear downlock actuators. The change, required within 100 flight hours after 30 June 1987, prevents bolt rotation that can shorten the downlock cable and risk landing‑gear failing to lock — affecting PA‑31s listed in the service bulletin with cable (not rod) actuators."}},"importantCases":[],"_links":{"self":"/api/acts/ad-pa-31-116-main-landing-gear-downlock-cable","history":"/api/acts/ad-pa-31-116-main-landing-gear-downlock-cable/history","analysis":"/api/acts/ad-pa-31-116-main-landing-gear-downlock-cable/analysis","conflicts":"/api/acts/ad-pa-31-116-main-landing-gear-downlock-cable/conflicts","importantCases":"/api/acts/ad-pa-31-116-main-landing-gear-downlock-cable/important-cases","documents":"/api/acts/ad-pa-31-116-main-landing-gear-downlock-cable/documents"}}