{"id":"F2006B06213","name":"AD/PHZL/46 Amdt 2 - Propeller De-Icer System Slip Ring - Inspection","slug":"ad-phzl-46-amdt-2-propeller-de-icer-system-slip-ring-inspection","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":47106,"registerId":"commonwealth-F2006B06213-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/PHZL/46 Amdt 2 - Propeller De-Icer System Slip Ring - Inspection","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/46\n\nAmdt 2\n\n  \nPropeller De-Icer System Slip Ring \\- Inspection 4/90\n\nApplicability: All propeller models HC-B3TN-3C or \\-3D equipped with propeller de-icer system using spinner bulkhead P/N D-3472 or D-3474, and fitted to Embraer EMB-110 series aircraft.\n\nRequirement: Action in accordance with Embraer Service Bulletin No 110-030-0006 Revision 2.\n\nNote: Brazilian AD 79-12-02 refers to SB 110-030-0006 initial issue.\n\nCompliance: 1. Inspect within 50 hours time in service after 28 November 1979.\n\n    2. Repeat inspection at periods not exceeding 50 hours time in service, for an additional 5 inspections.\n\n    3. Thereafter, inspect at periods not exceeding 300 hours time in service.\n\n    4. Inspection cycle to be repeated for replacement propellers.\n\nBackground: The aircraft manufacturer advises of the need to inspect for cracking of the resin that attaches the de-icer slip ring. The manufacturer has further revised his Service Bulletin which increased the 200 hour inspection to 300 hours.","sortOrder":0}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is Amendment 2 to an existing Airworthiness Directive (AD/PHZL/46). The amendment appears to incorporate a revision to the manufacturer's service bulletin that increased the recurring inspection interval from 200 to 300 hours. This represents a refinement based on operational experience rather than scope expansion—the directive remains tightly focused on the specific slip ring inspection for the identified aircraft/propeller combination."},"complexity_factors":["Single, specific technical requirement referencing an external service bulletin","Only 4 defined applicability criteria (propeller models, de-icer system, part numbers, aircraft type)","Simple phased compliance schedule with 3 distinct periods (50 hours × 6, then 300 hours)","No nested exceptions or conditional logic—straightforward 'inspect or don't fly' mandate","Background section provides clear rationale without legal cross-references","Total length: approximately 150 words of operative text"],"plain_english_summary":"This directive orders owners/operators of Embraer EMB‑110 aircraft with Hartzell HC‑B3TN‑3C/‑3D propellers (with the specified de‑icing spinner bulkhead) to inspect the propeller slip ring resin for cracks per Embraer Service Bulletin No 110‑030‑0006 Rev 2.\n\nInitial inspection within 50 flight hours after 28 Nov 1979, then every 50 hours for five checks, thereafter every 300 hours (propeller replacement restarts the cycle). Cracked slip rings can disable de‑icing, risking ice buildup, vibration, or structural failure."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":true,"description":"The instrument adopts the manufacturer's revised service bulletin that increased the long‑term recurring inspection interval from 200 to 300 hours (Background; reflected in Compliance point 3). Applicability and the initial short‑interval checks remain unchanged, so the change reduces inspection frequency after the initial series but does not expand affected aircraft or parts."},"complexity_factors":["Narrow applicability: limited to specific Hartzell propeller models, spinner bulkhead part numbers, and Embraer EMB‑110 aircraft (low scope breadth).","External-document dependency: compliance requires following Embraer Service Bulletin No.110‑030‑0006 Rev 2, creating reliance on an outside technical document.","Staged inspection schedule: initial 50‑hour check, five further 50‑hour checks, then 300‑hour recurring inspections — multiple timing tiers increase administrative tracking.","Repeat-on-replacement rule: inspection cycle must restart when propellers are replaced, adding lifecycle recordkeeping.","Regulatory cross-reference: note to earlier Brazilian AD and prior SB issue creates history to reconcile for operators.","Operational burden: inspections impose aircraft downtime, labour and potential parts-replacement costs for affected operators."],"plain_english_summary":"Requires targeted inspections of the resin that bonds the propeller de‑icer slip ring on Hartzell HC‑B3TN‑3C/‑3D propellers (with spinner bulkheads P/N D‑3472 or D‑3474) fitted to Embraer EMB‑110 aircraft, using Embraer Service Bulletin No.110‑030‑0006 Rev 2. The rule sets an early series of short‑interval checks then longer recurring inspections to detect cracking that could impair de‑icing; operators must perform, record and repeat the inspection cycle when propellers are replaced."}},"importantCases":[],"_links":{"self":"/api/acts/ad-phzl-46-amdt-2-propeller-de-icer-system-slip-ring-inspection","history":"/api/acts/ad-phzl-46-amdt-2-propeller-de-icer-system-slip-ring-inspection/history","analysis":"/api/acts/ad-phzl-46-amdt-2-propeller-de-icer-system-slip-ring-inspection/analysis","conflicts":"/api/acts/ad-phzl-46-amdt-2-propeller-de-icer-system-slip-ring-inspection/conflicts","importantCases":"/api/acts/ad-phzl-46-amdt-2-propeller-de-icer-system-slip-ring-inspection/important-cases","documents":"/api/acts/ad-phzl-46-amdt-2-propeller-de-icer-system-slip-ring-inspection/documents"}}