{"id":"F2006B08091","name":"AD/CESSNA 210/42 - Fuel Flow Indication System - Hose Inspection and Replacement","slug":"ad-cessna-210-42-fuel-flow-indication-system-hose-inspection-and-replacement","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":115201,"registerId":"commonwealth-F2006B08091-current","compilationNumber":null,"startDate":"2026-04-03","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/CESSNA 210/42 - Fuel Flow Indication System - Hose Inspection and Replacement","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)  \nCessna 210 Series Aeroplanes\n\nAD/CESSNA 210/42 Fuel Flow Indication System \\- Hose\n\nInspection and Replacement\n\n  \n11/79\n\nApplicability: Models 210L and T210L with S/Nos. 21061040 and subsequent Models 210M, T210M and P210N modified to incorporate Symbolic Displays Inc. fuel flow indicating system per STC.SA3835WE.\n\nRequirement: 1. Inspect the fuel flow transducer installation on the upper left side of the engine adjacent to the fuel distributor manifold.\n\n2. If an NAS 424-4 coupling is installed between transducer and distributor manifold, remove coupling and replace with either hose assembly Aeroquip P/No. AE7010001E0040 or Stratoflex P/No. 111D417-45-0040.\n\nNote: FAA AD 79-19-06 Amendment 39-3558 also refers to this subject.\n\nCompliance: Within 25 hours time in service after 3 October 1979.\n\nBackground: The hose assembly connecting the fuel flow transducer with the fuel distributor manifold has proved unsuitable in service and may leak fuel over the engine.","sortOrder":0}],"analysis":{"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":false,"description":"The directive maintains a focused scope: it addresses a single identified hardware risk on a defined set of aircraft and prescribes inspection and conditional replacement. It does not expand applicability beyond the listed models/STC, nor does it add ongoing monitoring or broader design changes."},"complexity_factors":["Narrow applicability: specific Cessna 210 models, serial numbers and STC-modified aircraft only","Single concrete action required: inspect location and replace a specific coupling if present","Short compliance window (25 hours TAS) increases operational scheduling pressure","Parts specificity: mandates two exact replacement hose part numbers","Cross-reference to an FAA AD (79-19-06) for background but no additional procedural steps"],"plain_english_summary":"This Airworthiness Directive requires operators of certain Cessna 210 variants (specified by serial number and by installation of a Symbolic Displays Inc. fuel flow system under STC SA3835WE) to inspect the fuel flow transducer installation. If an NAS 424-4 coupling is fitted between the transducer and the fuel distributor manifold, it must be removed and replaced with one of two specified hose assemblies within 25 hours time in service after 3 October 1979. Owners/operators bear the cost of inspection and any replacement parts and labour."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, targeted safety directive addressing a specific mechanical defect in specific aircraft models. It has not expanded beyond its original purpose of mandating hose replacement to prevent fuel leaks."},"complexity_factors":["Very short document (under 300 words)","Only 2 defined model ranges and 1 specific serial number cutoff","Single conditional requirement (if NAS 424-4 coupling present, then replace)","No nested exceptions or cross-references to other legislation sections","One external reference to FAA AD for background only, not for compliance","Clear, single compliance deadline with unambiguous metric (25 hours time in service)"],"plain_english_summary":"This CASA Airworthiness Directive orders owners/operators of certain Cessna 210 series (specific 210L/T210L serials and 210M/T210M/P210N aircraft with a Symbolic Displays fuel‑flow STC) to inspect the fuel‑flow transducer hose and, if fitted with an NAS 424‑4 coupling, replace it with an approved assembly. The original hose can leak fuel onto the engine, posing a fire hazard. Compliance is required within 25 flight hours after 3 October 1979."}},"importantCases":[],"_links":{"self":"/api/acts/ad-cessna-210-42-fuel-flow-indication-system-hose-inspection-and-replacement","history":"/api/acts/ad-cessna-210-42-fuel-flow-indication-system-hose-inspection-and-replacement/history","analysis":"/api/acts/ad-cessna-210-42-fuel-flow-indication-system-hose-inspection-and-replacement/analysis","conflicts":"/api/acts/ad-cessna-210-42-fuel-flow-indication-system-hose-inspection-and-replacement/conflicts","importantCases":"/api/acts/ad-cessna-210-42-fuel-flow-indication-system-hose-inspection-and-replacement/important-cases","documents":"/api/acts/ad-cessna-210-42-fuel-flow-indication-system-hose-inspection-and-replacement/documents"}}