{"id":"F2006B05522","name":"AD/PA-24/24 - Propeller Inspection and Operating Instructions","slug":"ad-pa-24-24-propeller-inspection-and-operating-instructions","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":46397,"registerId":"commonwealth-F2006B05522-current","compilationNumber":null,"startDate":"2026-04-02","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/PA-24/24 - Propeller Inspection and Operating Instructions","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)  \nPiper PA-24 (Comanche) Series Aeroplanes\n\nAD/PA-24/24 Propeller Inspection and Operating Instructions 2/70\n\nApplicability: Model PA-24 fitted with McCauley 2D36C14/78 KM-4 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 adjacent to the RPM indicator reading as follows:\n\n“AVOID CONTINUOUS OPERATION WHILE DESCENDING BETWEEN 2250 AND 2550 RPM WITH MANIFOLD PRESSURE SETTING BELOW 15 INCHES Hg”.\n\nNote: McCauley Service Bulletin No. 76 also refers.\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":2213},"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This airworthiness directive maintains its original narrow scope: addressing a specific technical defect in identified propeller installations. The instrument has not expanded beyond its initial safety purpose."},"complexity_factors":["Technical aviation terminology (dye penetrant inspection, manifold pressure, time in service) requiring industry-specific knowledge","Highly specific applicability limited to exact aircraft model and propeller part numbers","Minimal structural complexity: no defined terms section, no nested exceptions, and only one non-legislative cross-reference (to McCauley Service Bulletin No. 76)"],"plain_english_summary":"A safety directive for owners/operators of Piper PA‑24 Comanche aircraft with McCauley 2D36C14/78 KM‑4 propellers: within 25 flight hours after 29 Jan 1970, inspect blades for damage (10× magnifier), repair as needed, perform a dye‑penetrant crack inspection on each blade (hub to tip, no removal required), and install a placard warning pilots to avoid continuous descent operation between 2,250–2,550 RPM with manifold pressure below 15 inHg. This prevents propeller blade fractures and possible catastrophic loss of control."}},"importantCases":[],"_links":{"self":"/api/acts/ad-pa-24-24-propeller-inspection-and-operating-instructions","history":"/api/acts/ad-pa-24-24-propeller-inspection-and-operating-instructions/history","analysis":"/api/acts/ad-pa-24-24-propeller-inspection-and-operating-instructions/analysis","conflicts":"/api/acts/ad-pa-24-24-propeller-inspection-and-operating-instructions/conflicts","importantCases":"/api/acts/ad-pa-24-24-propeller-inspection-and-operating-instructions/important-cases","documents":"/api/acts/ad-pa-24-24-propeller-inspection-and-operating-instructions/documents"}}