{"id":"F2006B11246","name":"AD/M20/41 - Aerosonic Fuel Flow Transducers - Inspection and Replacement","slug":"ad-m20-41-aerosonic-fuel-flow-transducers-inspection-and-replacement","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":56966,"registerId":"commonwealth-F2006B11246-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/M20/41 - Aerosonic Fuel Flow Transducers - Inspection and Replacement","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)  Mooney M20 Series Aeroplanes\n\n \n\n# AD/M20/41 Aerosonic Fuel Flow Transducers - Inspection\n\nand Replacement\n\nApplicability: All model M20J and M20K.\n\n# 10/80\n\n \n\nRequirement: 1. Inspect all installed Aerosonic Fuel Flow Transducers for fuel leaks in the area where the transducer cap and body are bonded together.\n\n \n\n2.  (a) Replace all Aerosonic Fuel Flow Transducers P/N 33184-1 and 32622-6 (except those with the word “FLO-SCAN” marked on bottom of transducer) and install Aerosonic replacement units identified with “FLO-SCAN”, S/No. 5000 and up.\n\n \n\n(b)    Torque fittings to 25-30 ft. lbs.\n\n \n\n(c)    Perform a system leak check.\n\n \n\nNote: FAA AD 80-17-04 Amdt. 39-3873 and Aerosonic Service Bulletin No. 1 and No. 2 refer.\n\n \n\nCompliance: Inspect within 25 hours time in service after 13 October 1980 and thereafter every 25 hours time in service until replaced in accordance with para. 2 above. Transducers revealing fuel leaks in the area quoted in para. 1 above must be replaced before further flight.\n\n \n\nBackground: There is evidence to suggest that the quoted Aerosonic fuel flow transducer caps may not be properly bonded in the transducer body and may separate from the body. One instance overseas of cap separation allowed fuel leakage and resulted in an engine compartment fire.\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":{"flash_summary_failed":{"failed":true,"reason":"A positive credit balance is required for all requests, including BYOK, so fallback providers remain available. Add credits at https://vercel.com/d?to=%2F%5Bteam%5D%2F%7E%2Fai%3Fmodal%3Dtop-up to continue.","source":"analysis-cron"},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This AD maintains its original narrow scope — addressing a specific safety defect in a specific component on specific aircraft models. There is no evidence of scope creep; it remains tightly focused on the Aerosonic fuel flow transducer bonding defect identified in 1980."},"complexity_factors":["Single, specific mechanical component addressed (Aerosonic fuel flow transducers)","Only two model variants affected (M20J and M20K)","Straightforward two-part requirement: inspect, then replace if needed","Minimal defined terms (only standard aviation abbreviations like P/N for Part Number, S/No. for Serial Number)","No nested exceptions or conditional logic — replacement is mandatory for specific part numbers, optional for others","Clear compliance timeline with simple recurring interval (25 hours time in service)","Short document (approximately 250 words)","Single cross-reference to FAA AD and manufacturer service bulletins for additional context"],"plain_english_summary":"This CASA Airworthiness Directive applies to certain Mooney M20J and M20K aircraft and mandates inspection of Aerosonic fuel-flow transducers for cap/body leaks, with repeat checks every 25 flight hours until compliant. Transducers not marked \"FLO‑SCAN\" (P/N 33184‑1 and 32622‑6) must be replaced with units marked \"FLO‑SCAN\" (S/N 5000+) and fittings torqued and leak‑checked. Leaking units must be replaced before the aircraft flies again to prevent fuel leaks and engine fires."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The directive's scope remains as stated: it applies to all Mooney M20J and M20K aeroplanes and targets specific Aerosonic transducers by part number and marking, requiring inspection and replacement to mitigate cap separation and fuel-leak risk (Applicability; Requirement; Background). It does not expand the affected fleet or add discretionary obligations beyond the prescribed inspection, replacement, torque and leak‑check steps; it refers to FAA AD and manufacturer service bulletins for procedural detail but those references do not broaden the stated applicability (Note)."},"complexity_factors":["Fixed applicability to a narrow fleet (All M20J and M20K) — clear but limits scope to specific owners/operators (Applicability).","Recurring inspection interval: every 25 hours until replacement — creates ongoing maintenance scheduling and tracking (Compliance).","Immediate grounding requirement for leaking transducers: must be replaced before further flight if leak found — operational disruption risk (Compliance: 'must be replaced before further flight').","Parts identification and exception rules: replace P/N 33184-1 and 32622-6 except units marked 'FLO‑SCAN'; replacement units identified by 'FLO‑SCAN' S/No. 5000 and up — requires physical marking/serial checks (Requirement 2(a)).","Specific installation procedures: torque fittings 25–30 ft·lbs and perform system leak check — requires correct tooling and verification (Requirement 2(b),(c)).","Cross-references to external documents (FAA AD and Aerosonic Service Bulletins) — may require consulting additional material for full compliance steps (Note).","Cost and labour borne by owner/operator — inspections, replacements, torqueing and leak checks create direct maintenance costs and downtime (implied by Requirement & Compliance).","Low regulatory discretion: AD prescribes concrete actions and limits interpretative flexibility, reducing administrative ambiguity (Requirement & Compliance)."],"plain_english_summary":"This airworthiness directive requires owners/operators of Mooney M20J and M20K aeroplanes to inspect Aerosonic fuel flow transducers for cap‑to‑body fuel leaks every 25 flight hours and to replace specified transducer part numbers or units not marked “FLO‑SCAN”; replacements must be torqued to 25–30 ft·lbs and leak‑checked. It responds to evidence that transducer caps can separate and has recorded a fuel leak that led to an engine‑compartment fire, so it creates recurring inspection and parts‑replacement duties for the affected fleet."}},"importantCases":[],"_links":{"self":"/api/acts/ad-m20-41-aerosonic-fuel-flow-transducers-inspection-and-replacement","history":"/api/acts/ad-m20-41-aerosonic-fuel-flow-transducers-inspection-and-replacement/history","analysis":"/api/acts/ad-m20-41-aerosonic-fuel-flow-transducers-inspection-and-replacement/analysis","conflicts":"/api/acts/ad-m20-41-aerosonic-fuel-flow-transducers-inspection-and-replacement/conflicts","importantCases":"/api/acts/ad-m20-41-aerosonic-fuel-flow-transducers-inspection-and-replacement/important-cases","documents":"/api/acts/ad-m20-41-aerosonic-fuel-flow-transducers-inspection-and-replacement/documents"}}