{"id":"F2006B06228","name":"AD/PHZL/71 - Counterweight Clamp Bolts","slug":"ad-phzl-71-counterweight-clamp-bolts","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":47155,"registerId":"commonwealth-F2006B06228-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/PHZL/71 - Counterweight Clamp Bolts","content":"COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 \\- 107 CIVIL AVIATION SAFETY AUTHORITY\n\nSCHEDULE OF AIRWORTHINESS DIRECTIVES\n\n![](image.001.png)  \nPropellers \\- Variable Pitch \\- Hartzell\n\nAD/PHZL/71 Counterweight Clamp Bolts 5/98\n\nApplicability: All Hartzell Propeller Inc. Model HC-E4A-3(A,I) propellers with serial numbers HJ1 to HJ654.\n\nRequirement: Identify and replace defective propeller blade counterweight clamp bolts with improved bolts in accordance with Hartzell Propeller Inc. Service Bulletin (SB) No. HC-SB-61-219, Revision 1, dated July 2, 1996.\n\nNote 1: Subject propellers are installed on but not limited to Raytheon Beech 1900D series aircraft.\n\nNote 2: FAA AD 98-02-07 and Hartzell SB HC-SB-61-219 refer.\n\nCompliance: Within 45 days or 400 hours time in service (TIS) after the effective date of the AD, whichever occurs first.\n\nThis airworthiness directive becomes effective on 23 April 1998.\n\nBackground: The manufacture has advised that a counterweight clamp installed on an HC-E4A-3A propeller separated in flight. The clamp passed through the spinner dome and struck an adjacent blade resulting in a blade failure. One of the two socket head screws attaching the counterweight clamp broke. The failure was due to a defective socket head cap screw.","sortOrder":0}],"analysis":{"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":false,"description":"The directive does not expand or narrow scope beyond its stated applicability: it targets HC-E4A-3(A,I) propellers with serial numbers HJ1–HJ654 and mandates replacement per Hartzell SB HC-SB-61-219 Rev 1 (Applicability; Requirement). References to FAA AD 98-02-07 and the SB (Note 2) provide supporting material but do not alter the AD's stated scope."},"complexity_factors":["Narrow applicability to a single propeller model and defined serial number range (Applicability).","Prescriptive corrective action tied to a specific manufacturer Service Bulletin with revision and date (Requirement: HC-SB-61-219, Revision 1, 2 July 1996).","Dual compliance metric creates a short deadline measured in calendar days or aircraft hours (Compliance: within 45 days or 400 hours TIS).","Cross-references to FAA AD 98-02-07 and the Hartzell service bulletin increase traceability requirements for compliance records (Note 2).","Immediate effective date and short compliance window concentrate operational and logistical impact on operators (Effective date: 23 April 1998; Compliance).","Safety rationale is specific and incident-driven: in‑flight clamp separation caused blade failure due to a broken socket head cap screw (Background), implying urgent but narrowly scoped remedial work.","Enforcement and legal obligation rest with the Civil Aviation Safety Authority under the Civil Aviation Regulations framework (header: Civil Aviation Safety Authority).","Practical compliance burden consists of inspection, part procurement and bolt replacement work which operators must fund (Requirement)."],"plain_english_summary":"This airworthiness directive orders operators of Hartzell Model HC-E4A-3(A,I) propellers (serial HJ1–HJ654) to identify and replace defective counterweight clamp bolts with improved bolts per Hartzell Service Bulletin HC-SB-61-219 Rev 1. Operators must comply within 45 days or 400 hours TIS. The action follows an in‑flight counterweight clamp separation caused by a broken socket‑head screw that led to blade failure. Operators bear the inspection and replacement costs; the Civil Aviation Safety Authority enforces the deadline."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This AD maintains its original narrow scope: addressing a specific mechanical defect in specific propeller models. It has not expanded beyond its original safety purpose."},"complexity_factors":["Single, specific mechanical defect addressed","Only one applicability criterion (propeller model and serial number range)","Single compliance action (replace bolts per manufacturer bulletin)","Simple time-based compliance trigger (45 days OR 400 hours)","No nested exceptions, conditional logic, or cross-references to other legislation","Only 2 brief notes providing context, not legal conditions"],"plain_english_summary":"This CASA Airworthiness Directive mandates inspection and replacement of defective counterweight-clamp bolts on specified Hartzell HC-E4A-3(A,I) propellers (S/N HJ1–HJ654), following Hartzell Service Bulletin HC-SB-61-219 Rev 1. A broken bolt has already caused catastrophic propeller damage; operators (including Beech 1900D users) must comply within 45 days or 400 flight hours from 23 April 1998. Noncompliance grounds the aircraft."}},"importantCases":[],"_links":{"self":"/api/acts/ad-phzl-71-counterweight-clamp-bolts","history":"/api/acts/ad-phzl-71-counterweight-clamp-bolts/history","analysis":"/api/acts/ad-phzl-71-counterweight-clamp-bolts/analysis","conflicts":"/api/acts/ad-phzl-71-counterweight-clamp-bolts/conflicts","importantCases":"/api/acts/ad-phzl-71-counterweight-clamp-bolts/important-cases","documents":"/api/acts/ad-phzl-71-counterweight-clamp-bolts/documents"}}