{"id":"F2006B05782","name":"AD/PA-31/77 Amdt 1 - Fuel Crossfeed Valve - Inspection","slug":"ad-pa-31-77-amdt-1-fuel-crossfeed-valve-inspection","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":135661,"registerId":"commonwealth-F2006B05782-current","compilationNumber":null,"startDate":"2026-04-03","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/PA-31/77 Amdt 1 - Fuel Crossfeed Valve - Inspection","content":"---\nmeta-content-style-type: text/css\nmeta-content-type: application/xhtml+xml; charset=utf-8\nmeta-generator: Aspose.Words for .NET 22.10.0\n---\n\n?xml version=\"1.0\" encoding=\"utf-8\" standalone=\"no\"?>\n\nCOMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY\n\nSCHEDULE OF AIRWORTHINESS DIRECTIVES\n\n \n\n![](image.001.png)  Piper PA-31 Series Aeroplanes\n\n \n\nAD/PA-31/77\n\nAmdt 1\n\n\nFuel Crossfeed Valve - Inspection 9/79\n\n \n\nApplicability: Models PA-31, PA-31-300 and PA-31-325 with S/Nos. 31-2 to 31-7812108, 31- 7812116, 31-7812120 to 31-7812123 and 31-7812125. Model PA-31-350 with S/Nos.\n\n31-5001 to 31-7852138, 31-7852140 to 31-7852193.\n\n \n\nDocument: Piper SB No. 645A.\n\n \n\nCompliance: Within 100 hours time in service after 30 September 1979.\n\n \n\nBackground: A number of crossfeed valve actuating arms may have been attached to the valve with aluminium rivets instead of steel rivets. Shearing of the softer rivets would result in loss of crossfeed capability.\n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n","sortOrder":0}],"analysis":{"kimi_summary":{"_metrics":{"model":"kimi-k2.5","source":"moonshot-batch","completionTokens":2327},"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"As Amendment 1 to the original AD/PA-31/77, this version maintains the original safety scope of addressing the fuel crossfeed valve rivet defect. While amendments typically update applicability lists or compliance times, the core purpose—preventing crossfeed system failure due to sheared rivets—remains unchanged."},"complexity_factors":["Single, discrete mechanical defect addressed (incorrect rivet material)","Highly specific applicability limited to four aircraft models with defined serial number ranges","One straightforward compliance action (inspection/replacement) with single time limit","No exceptions, exemptions, or conditional logic pathways","Single external technical reference (Piper SB 645A)"],"plain_english_summary":"This mandatory CASA Airworthiness Directive requires owners/operators of specified Piper PA‑31 series aircraft to inspect fuel crossfeed valve actuating arms and confirm they are secured with steel (not aluminium) rivets, replacing any aluminium rivets per Piper Service Bulletin No. 645A. Aluminium rivets can shear, disabling fuel crossfeed and risking fuel starvation/engine failure. Compliance: within 100 flight hours after 30 September 1979."}},"importantCases":[],"_links":{"self":"/api/acts/ad-pa-31-77-amdt-1-fuel-crossfeed-valve-inspection","history":"/api/acts/ad-pa-31-77-amdt-1-fuel-crossfeed-valve-inspection/history","analysis":"/api/acts/ad-pa-31-77-amdt-1-fuel-crossfeed-valve-inspection/analysis","conflicts":"/api/acts/ad-pa-31-77-amdt-1-fuel-crossfeed-valve-inspection/conflicts","importantCases":"/api/acts/ad-pa-31-77-amdt-1-fuel-crossfeed-valve-inspection/important-cases","documents":"/api/acts/ad-pa-31-77-amdt-1-fuel-crossfeed-valve-inspection/documents"}}