{"id":"F2006B09562","name":"AD/ENG/6 Amdt 1 - Propeller Strike","slug":"ad-eng-6-amdt-1-propeller-strike","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":54217,"registerId":"commonwealth-F2006B09562-current","compilationNumber":null,"startDate":"2026-04-02","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/ENG/6 Amdt 1 - Propeller Strike","content":"COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 \\- 106 CIVIL AVIATION SAFETY AUTHORITY\n\nSCHEDULE OF AIRWORTHINESS DIRECTIVES\n\n![](image.001.png)  \nEngines \\- General\n\nAD/ENG/6\n\nAmdt 1\n\n  \nPropeller Strike 1/94\n\nApplicability: All piston engines which have had a propeller strike.\n\nRequirement: Following a propeller strike, the aircraft shall be inspected to determine whether the engine has been subjected to abnormal loads and stresses which may have caused engine external and/or internal mechanical damage.\n\nAn engine, which has been subjected to a sudden stoppage and/or propeller damage to an extent where significant bending or torsional load may have occurred, shall be considered to have been subjected to abnormal loads and stresses and shall be removed from service. The engine shall only be returned to service following the disassembly, inspection, assembly and test of the engine in accordance with the engine manufacturer's published data.\n\nNote: Where there is doubt concerning any likely secondary damage which may have been sustained, when considering the circumstances of the incident, advice may be obtained from the manufacturer or an appropriate CAR 35 authorised person.\n\nCompliance: Effective 6 January 1994: Prior to further flight.\n\nBackground: This Directive details the action required following a propeller strike event. The Directive has been amended to clarify the inspection requirements, and to delete reference to a cancelled document, CAO 100.5.1.","sortOrder":0}],"analysis":{"kimi_summary":{"_metrics":{"model":"kimi-k2.5","source":"moonshot-batch","completionTokens":1708},"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is Amendment 1 to an existing directive. The amendment narrows and clarifies the inspection requirements and removes a reference to a cancelled regulation (CAO 100.5.1), but does not expand the scope beyond the original purpose of regulating piston engines after propeller strikes."},"complexity_factors":["Short, single-issue directive covering one specific scenario (propeller strikes)","Only one external reference (CAR 35 authorised persons)","Simple conditional logic (if sudden stoppage or significant bending/torsional load, then mandatory engine removal)","No defined terms section — key terms explained in context","Clear, immediate compliance deadline (prior to further flight)"],"plain_english_summary":"This Airworthiness Directive requires immediate engine inspection after any propeller strike on piston-engine aircraft. Operators and maintenance personnel must ground the aircraft if the engine experienced abnormal forces (sudden stoppage or propeller bending) and may not return it to service until it has been disassembled, inspected, reassembled, and tested per the engine maker’s instructions. Consult the manufacturer or an authorised aviation engineer if damage is uncertain."}},"importantCases":[],"_links":{"self":"/api/acts/ad-eng-6-amdt-1-propeller-strike","history":"/api/acts/ad-eng-6-amdt-1-propeller-strike/history","analysis":"/api/acts/ad-eng-6-amdt-1-propeller-strike/analysis","conflicts":"/api/acts/ad-eng-6-amdt-1-propeller-strike/conflicts","importantCases":"/api/acts/ad-eng-6-amdt-1-propeller-strike/important-cases","documents":"/api/acts/ad-eng-6-amdt-1-propeller-strike/documents"}}