{"id":"F2006B05939","name":"AD/PA-36/22 - Forward Fuselage Tubes","slug":"ad-pa-36-22-forward-fuselage-tubes","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":136071,"registerId":"commonwealth-F2006B05939-current","compilationNumber":null,"startDate":"2026-04-03","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/PA-36/22 - Forward Fuselage Tubes","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-36 (Pawnee Brave) Series Aeroplanes\n\n \n\nAD/PA-36/22 Forward Fuselage Tubes 6/86 T\n\nApplicability: All models PA-36-300 with S/Nos. 36-7760001 through 36-8160023 and PA-36-375 with S/Nos. 36-7802001 through 36-8302025 which have not been modified in accordance with Piper Service Bulletin No. 828.\n\n \n\nDocument: Inspect the forward fuselage tubing at the engine mount attachment areas in accordance with Piper Service Bulletin No. 828.\n\n \n\nCompliance: Prior to further flight after 12 May 1986 and thereafter at intervals not exceeding 25 hours time in service.\n\n \n\nBackground: The manufacturer reports that cracks have been found in the forward fuselage tubing weld clusters at the engine mount attachment locations. If undetected, this could result in engine/mount separation.\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":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, targeted safety directive addressing a specific airworthiness concern. It has not expanded beyond its original purpose of mandating inspections for cracked fuselage tubing in specific Piper aircraft models."},"complexity_factors":["Single, specific technical requirement (one inspection procedure)","Limited applicability (two specific model variants with defined serial number ranges)","Clear compliance deadline and recurring interval (25 hours time in service)","No defined terms section or interpretation provisions","No cross-references to other legislation beyond the referenced Service Bulletin","Simple conditional logic (applies unless already modified per SB 828)","Total length: approximately 150 words of substantive content"],"plain_english_summary":"This CASA Airworthiness Directive orders mandatory inspections of the forward fuselage tubing welds on certain Piper PA‑36 Pawnee Brave aircraft (specific PA‑36‑300 and PA‑36‑375 serial ranges) unless already modified per Piper SB No. 828. \n\nIt’s required before the next flight (post‑12 May 1986) and repeat every 25 flight hours to detect engine‑mount weld cracks that could lead to in‑flight engine separation and catastrophic loss."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The directive targets a defined set of PA-36 aircraft not modified per Service Bulletin No. 828 and prescribes inspections; the text does not indicate any expansion or narrowing of scope beyond these specified aircraft and the stated inspection regime."},"complexity_factors":["Narrow applicability by model and serial-number ranges (Applicability).","Exemption if already modified per Piper Service Bulletin No. 828 — requires verifying modification status/records (Applicability).","Mandated action is to inspect 'in accordance with Piper Service Bulletin No. 828' — reliance on an external technical document for procedure and acceptability (Document).","Short, recurring inspection interval: prior to next flight after 12 May 1986 and thereafter every 25 hours time in service — creates operational scheduling and downtime costs (Compliance).","Clear safety consequence if non-compliant: cracks in forward fuselage tubing weld clusters at engine mount attachment locations could result in engine/mount separation (Background).","Limited regulatory discretion in text: prescriptive inspection requirement rather than performance-based alternative (Document/Compliance).","Administrative burden on operators to track applicability, record inspections, and confirm exemption status from the service bulletin (Applicability; Document)."],"plain_english_summary":"This airworthiness directive requires owners/operators of specified Piper PA-36-300 and PA-36-375 aeroplanes (particular serial-number ranges) that have not been modified under Piper Service Bulletin No. 828 to inspect the forward fuselage tubing at the engine‑mount attachment areas per that service bulletin. Inspections must be done before the next flight after 12 May 1986 and then every 25 hours to detect cracks that, if undetected, could lead to engine/mount separation; operators bear the inspection work and downtime."}},"importantCases":[],"_links":{"self":"/api/acts/ad-pa-36-22-forward-fuselage-tubes","history":"/api/acts/ad-pa-36-22-forward-fuselage-tubes/history","analysis":"/api/acts/ad-pa-36-22-forward-fuselage-tubes/analysis","conflicts":"/api/acts/ad-pa-36-22-forward-fuselage-tubes/conflicts","importantCases":"/api/acts/ad-pa-36-22-forward-fuselage-tubes/important-cases","documents":"/api/acts/ad-pa-36-22-forward-fuselage-tubes/documents"}}