{"id":"F2006B06235","name":"AD/PHZL/79 Amdt 1 - Propeller Vibration Placard","slug":"ad-phzl-79-amdt-1-propeller-vibration-placard","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":47177,"registerId":"commonwealth-F2006B06235-current","compilationNumber":null,"startDate":"2026-04-02","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"For Utility and Aerobatic Category aerop","sectionType":"part","heading":"For Utility and Aerobatic Category aeroplanes:","content":"# For Utility and Aerobatic Category aeroplanes:\n\n    Unless previously accomplished remove any vibration placard that does not have the following statement and replace with one that does.\n\n“Avoid continuous operation Between 2000 and 2350 rpm.\n\nAbove 2600 rpm in aerobatic flight”.\n\n    2. Unless previously accomplished re-mark the tachometer face or bezel with a red arc for the restricted engine speed range, between 2000 and 2350 rpm, and\n\nbetween 2600 and 2700 rpm (red line).","sortOrder":0},{"sectionNumber":"Propellers - Variable Pitch - Hartzell","sectionType":"part","heading":"Propellers - Variable Pitch - Hartzell","content":"# Propellers \\- Variable Pitch \\- Hartzell\n\nAD/PHZL/79 Amdt 1 (continued)\n\n    3. Include a copy of this Directive with the aeroplane flight manual, where there is an aeroplane flight manual fitted.\n\nNote 3: FAA AD 2002-09-08 Amdt 39-12741 refers.\n\nCompliance: Within 100 flight hours from the effective date of this directive.\n\nThis Amendment becomes effective on 7 August 2003.\n\nBackground: This amendment corrects errors relating to the identification of undampered engines.\n\nThis Directive requires placards to be fitted to limit operation of the propeller at certain engine speeds. This will prevent failure of the propeller blade due to vibration. Engine speed limitations were previously published in amendments to the Australian Civil MkI an MkII Flight Manuals.\n\nThe original issue of this Directive became effective on 10 July 2003.\n\n![Signature of James Coyne, Delegate of the Civil Aviation Safety Authority.](image.002.png)  \n\nJim Coyne\n\nDelegate of the Civil Aviation Safety Authority 27 June 2003\n\n![](image.001.png)  \n\nThe above AD is notified in the Commonwealth of Australia Gazette on 16 July 2003.","sortOrder":1}],"analysis":{"kimi_summary":{"_metrics":{"model":"kimi-k2.5","source":"moonshot-batch","completionTokens":2340},"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":true,"description":"This Amendment 1 corrects the scope of the original directive issued one month earlier. It fixes technical errors in identifying which 'undampered engines' (engines lacking vibration dampeners) should be subject to the directive. While the safety purpose remains preventing propeller failure, this amendment narrows and corrects the specific engine types and aircraft covered to ensure compliance targets the correct equipment."},"complexity_factors":["Single-purpose technical directive with only three specific, sequential compliance tasks","No conditional logic, exceptions, or nested definitions","Limited scope to specific aircraft categories and one propeller manufacturer (Hartzell)","Cross-reference limited to one related FAA directive (Note 3)"],"plain_english_summary":"This directive requires owners of Utility and Aerobatic category aeroplanes with specified Hartzell variable‑pitch propellers to add new vibration warning labels (stating \"Avoid continuous operation Between 2000 and 2350 rpm. Above 2600 rpm in aerobatic flight\"), mark restricted ranges on the tachometer, and update carried flight manuals. It prevents dangerous propeller vibration and blade fatigue by warning pilots not to operate in specific engine‑speed bands; compliance is within 100 flight hours of 7 Aug 2003."}},"importantCases":[],"_links":{"self":"/api/acts/ad-phzl-79-amdt-1-propeller-vibration-placard","history":"/api/acts/ad-phzl-79-amdt-1-propeller-vibration-placard/history","analysis":"/api/acts/ad-phzl-79-amdt-1-propeller-vibration-placard/analysis","conflicts":"/api/acts/ad-phzl-79-amdt-1-propeller-vibration-placard/conflicts","importantCases":"/api/acts/ad-phzl-79-amdt-1-propeller-vibration-placard/important-cases","documents":"/api/acts/ad-phzl-79-amdt-1-propeller-vibration-placard/documents"}}