{"id":"F2006B11222","name":"AD/M20/14 - Propeller Inspection and Operating Restriction","slug":"ad-m20-14-propeller-inspection-and-operating-restriction","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":56940,"registerId":"commonwealth-F2006B11222-current","compilationNumber":null,"startDate":"2026-04-02","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/M20/14 - Propeller Inspection and Operating Restriction","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)  \nMooney M20 Series Aeroplanes\n\nAD/M20/14 Propeller Inspection and Operating Restriction 2/70\n\nApplicability: All models M20A, B, C or D fitted with McCauley 2D36C14/78 KM-4 or 2D34C53- A/74E-0 propellers.\n\nRequirement: 1. Visually inspect blades for damage with the aid of a 10 power (2 1/2X) glass for defects such as erosion scratches, nicks, cracks etc. Rectify as necessary. After rectification, dye penetrant inspect the entire blade from hub to tip.\n\nNote: This work can be performed without removing the propeller from the engine.\n\n2. Install a placard on the instrument panel and adjacent to the RPM indicator reading as follows:\n\n“AVOID CONTINUOUS OPERATION WHILE DESCENDING BETWEEN 2250 AND 2550 RPM WITH MANIFOLD PRESSURE SETTINGS BELOW 15 INCHES Hg”\n\nCompliance: Within 25 hours time in service after 29 January 1970.","sortOrder":0}],"analysis":{"kimi_summary":{"_metrics":{"model":"kimi-k2.5","source":"moonshot-batch","completionTokens":1862},"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This airworthiness directive maintains its original narrow scope as a safety-specific maintenance requirement for defined aircraft propeller models. It addresses the specific safety issue of propeller blade integrity and descent operating parameters without expansion into broader operational areas."},"complexity_factors":["Very short document with only three specific requirements","No interpretation section or defined terms","Single, narrow applicability (four specific aircraft models with two specific propeller types)","No cross-references to other legislation or conditional clauses","Single compliance deadline with straightforward calculation method"],"plain_english_summary":"This directive requires owners/operators of Mooney M20A–D aircraft fitted with McCauley propellers (models 2D36C14/78 KM-4 or 2D34C53-A/74E-0) to inspect and repair propeller blades using 10× magnification, perform a dye-penetrant crack inspection (hub-to-tip) without removing the propeller, and install a cockpit placard with the exact warning: \"AVOID CONTINUOUS OPERATION WHILE DESCENDING BETWEEN 2250 AND 2550 RPM WITH MANIFOLD PRESSURE SETTINGS BELOW 15 INCHES Hg.\"\n\nCompliance is required within 25 flight hours after 29 January 1970 to prevent vibration-induced blade failure and potential in-flight loss of control."}},"importantCases":[],"_links":{"self":"/api/acts/ad-m20-14-propeller-inspection-and-operating-restriction","history":"/api/acts/ad-m20-14-propeller-inspection-and-operating-restriction/history","analysis":"/api/acts/ad-m20-14-propeller-inspection-and-operating-restriction/analysis","conflicts":"/api/acts/ad-m20-14-propeller-inspection-and-operating-restriction/conflicts","importantCases":"/api/acts/ad-m20-14-propeller-inspection-and-operating-restriction/important-cases","documents":"/api/acts/ad-m20-14-propeller-inspection-and-operating-restriction/documents"}}