{"id":"F2006B06234","name":"AD/PHZL/78 - Anti-ice boots","slug":"ad-phzl-78-anti-ice-boots","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":47173,"registerId":"commonwealth-F2006B06234-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"AIRWORTHINESS DIRECTIVE","sectionType":"part","heading":"AIRWORTHINESS DIRECTIVE","content":"# ![](image.001.png)  \nAIRWORTHINESS DIRECTIVE\n\nFor the reasons set out in the background section, the CASA delegate whose signature appears below issues the following Airworthiness Directive (AD) under subregulation 39.1 (1) of CASR 1998. The AD requires that the action set out in the requirement section (being action that the delegate considers necessary to correct the unsafe condition) be taken in relation to the aircraft or aeronautical product mentioned in the applicability section: (a) in the circumstances mentioned in the requirement section; and (b) in accordance with the instructions set out in the requirement section; and (c) at the time mentioned in the compliance section.\n\n![](image.001.png)  \n\nPropellers \\- Variable Pitch \\- Hartzell","sortOrder":0},{"sectionNumber":"AD/PHZL/78 Anti-Ice Boots 7/2003","sectionType":"part","heading":"AD/PHZL/78 Anti-Ice Boots 7/2003","content":"# AD/PHZL/78 Anti-Ice Boots 7/2003\n\nApplicability: Hartzell Propeller Inc. model HC-C2Y(K,R)-1BF/F8477-4 propellers with TKS (Aircraft De-icing) Ltd. anti- ice boots that were installed by SOCATA-Groupe AEROSPATIALE, the aircraft manufacturer, using TKS Ltd. Procedure P232, Specification for the Attachment of Propeller Overshoes.\n\nNote 1: These propellers are installed on, but not limited to American Champion 8GCBC, Cessna 170 series, 172 series, 175 series, Piper PA-18 series, Sky International Inc. (Husky) A-1 (previous owners were Christen Industries; Aviat, Inc.; White International, LTD.), and SOCATA-Groupe AEROSPATIALE TB-20 and TB-21 aeroplanes.\n\nRequirement: For propellers that have been overhauled after the installation of TKS (Aircraft De- icing) Ltd. Anti- ice boots, and have had the anti- ice boots re- installed using Hartzell Manual 133C (ATA 61-13-33) ''Aluminum Blade Overhaul'', AS&T Procedure 4700INS, or other approved procedures (excluding TKS Procedure P232) no further action is required. For propellers that have had the anti- ice boots installed using the TKS Procedure P232, but have not had anti- ice boots re- installed using Hartzell Manual 133C (ATA 61-13-33) ''Aluminum Blade Overhaul'', AS&T Procedure 4700INS, or other approved procedures (excluding TKS Procedure P232), remove anti- ice boots, inspect and rework anti- ice boot areas of propeller blades, and install new anti- ice boots in accordance with paragraph 3 of the Accomplishment Instructions of Hartzell Propeller Inc. Alert Service Bulletin (ASB) HC-ASB-61-251.\n\nNote 2: FAA AD 2003-06-02 Amdt 39-13089 refers.\n\nCompliance: For propellers with less than 500 hours time \\-in-service (TIS) and less than 3 years time since new (TSN); within 200 hours TIS from the effective date of this Directive, not exceeding 600 hours TSN, or prior to 4 years TSN whichever occurs first.\n\nFor propellers with 500 hours or more hours TIS, or 3 years or more TSN but less than 6 years TSN; within 100 hours TIS, or 1 year from the effective date of this Directive.\n\nFor propellers with 6 years or more TSN; within 50 hours TIS, or within 6 months from the effective date of this Directive, whichever comes first.\n\nThis Airworthiness Directive becomes effective on 10 July 2003.","sortOrder":1}],"analysis":{"flash_summary_failed":{"failed":true,"reason":"Unauthenticated. Configure AI_GATEWAY_API_KEY or use a provider module. Learn more: https://ai-sdk.dev/unauthenticated-ai-gateway","source":"analysis-cron"},"flash_summary":{"complexity_score":4,"scope_assessment":{"changed":false,"description":"The Directive applies narrowly to propellers meeting the stated installation and model criteria and prescribes corrective work and deadlines. The text does not indicate an expansion or narrowing of scope beyond that stated applicability; it targets propellers installed using TKS Procedure P232 unless subsequently reworked under specified approved procedures."},"complexity_factors":["Narrow technical applicability: only specific Hartzell model propellers with TKS boots installed by SOCATA using TKS Procedure P232.","Conditional exception: no action required if propeller was overhauled and boots reinstalled using Hartzell Manual 133C, AS&T Procedure 4700INS, or other approved procedures (excluding P232).","Multiple staged compliance windows tied to both hours time‑in‑service (TIS) and years time‑since‑new (TSN), creating administrative scheduling complexity.","Prescriptive corrective action references an external manufacturer Alert Service Bulletin (Hartzell HC‑ASB‑61‑251 ¶3) and several other procedures, requiring access to and reliance on those documents.","Operational impact concentrated on owners/operators who must remove, inspect, rework and fit new boots; costs are private and immediate once non‑compliance is identified.","Cross‑reference to FAA AD (FAA AD 2003‑06‑02) increases interpretive complexity for operators familiar with multiple regulators' directives."],"plain_english_summary":"This Airworthiness Directive orders owners/operators of certain Hartzell HC‑C2Y(K,R)‑1BF/F8477‑4 propellers fitted with TKS anti‑ice boots (installed by SOCATA using TKS Procedure P232) to remove, inspect, rework and replace the boots in accordance with Hartzell Propeller Inc. Alert Service Bulletin HC‑ASB‑61‑251 paragraph 3 where P232 was used and not later superseded by approved overhaul procedures. It sets phased compliance deadlines based on time‑in‑service and calendar age. Operators pay for inspections, repairs and replacement; CASA enforces compliance."},"kimi_summary":{"content_quality":"ok","complexity_score":4,"scope_assessment":{"changed":false,"description":"This is a standard Airworthiness Directive with focused scope — it addresses a specific unsafe condition in specific propeller models. The scope remains tightly constrained to the identified safety issue without expansion into broader regulatory areas."},"complexity_factors":["Multiple conditional compliance deadlines based on two variables (hours flown and age of propeller)","Nested exception structure: main requirement has two branches, with the second branch containing its own sub-conditions","Cross-reference to external documents (Hartzell Manual 133C, AS&T Procedure 4700INS, FAA AD 2003-06-02, Hartzell ASB HC-ASB-61-251)","Specific model number identification requiring technical aviation knowledge to interpret applicability","Dual-path compliance determination requiring maintenance history verification (which installation method was used)"],"plain_english_summary":"This CASA safety order requires owners/operators of certain Hartzell HC-C2Y(K,R)-1BF/F8477-4 propellers with TKS anti-ice boots to remove and refit boots using Hartzell’s approved method (and inspect/repair blade surfaces) if the boots were installed by the older TKS Procedure P232.  \n\nIt targets owners of common light types (Cessna, Piper, Champion, Aviat, SOCATA) because improper boot installation after overhaul can lead to ice-related vibration, loss of thrust, or blade failure — deadlines vary by propeller age and hours."}},"importantCases":[],"_links":{"self":"/api/acts/ad-phzl-78-anti-ice-boots","history":"/api/acts/ad-phzl-78-anti-ice-boots/history","analysis":"/api/acts/ad-phzl-78-anti-ice-boots/analysis","conflicts":"/api/acts/ad-phzl-78-anti-ice-boots/conflicts","importantCases":"/api/acts/ad-phzl-78-anti-ice-boots/important-cases","documents":"/api/acts/ad-phzl-78-anti-ice-boots/documents"}}