{"id":"F2006B06203","name":"AD/PHZL/14 Amdt 4 - Blade and Hub - Shot Peening","slug":"ad-phzl-14-amdt-4-blade-and-hub-shot-peening","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":47082,"registerId":"commonwealth-F2006B06203-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/PHZL/14 Amdt 4 - Blade and Hub - Shot Peening","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/14\n\nAmdt 4\n\n  \nBlade and Hub \\- Shot Peening 8/95\n\nApplicability: HC-92WK-() and HC-92ZK-() propellers installed on but not limited to: Aerostar Aircraft Corp. (formerly Ted Smith Aerostar) Model Aerostar 360;\n\nAir & Space America, Inc. Model 18A; Aircraft Acquisition Corp. (formerly Helio) Models H-250, 500;\n\nBeech Models 95, B95, B95A, D95A, E95;\n\nCessna Models 172, 175, 175A;\n\nFound Brothers Aviation Ltd. Models FBA 100, FBA-2C; Kwad Company Model Super-V;\n\nMooney Aircraft Corp. Model M20A; Piper Models PA-23, PA-24, PA-25;\n\nProcaer Model F15/B; Revo Inc. Models C2, Lake LA-4 and Simmering Graz Pauker A.G. Model SGP-222.\n\nRequirement: 1. Action in accordance with Procedure #1 of Hartzell Service Bulletin 202.\n\n2. Action in accordance with Procedure #2 of Hartzell Service Bulletin 202.\n\nNote 1. FAA AD 95-11-08 Amdt 39-9243 supersedes FAA AD 73-02-01 Amdt 39-\n\n1584.\n\nNote 2. FAA AD 73-02-01 referenced in amdt 3 of this Directive required compliance with cancelled Hartzell SB 83. SB 83 required shot peening of the hub and blades.\n\nThe requirement for blade shot peening was replaced by cold rolling introduced by Hartzell SB 118. CAO 107 AD/PHZL/43 Amdt 8 refers.\n\nCompliance: 1. Unless previously carried out, within 10 hours time in service from 20 July 1995.\n\n2. a. If time since last inspection as required by CAO 107 AD/PHZL/14 Amdt 3 is less than 450 hours time in service, perform blade inspection and compressive rolling prior to reaching 500 hours time in service.\n\nThereafter, reinspect at intervals not exceeding 500 hours time in service.\n\n2. b. If time since last inspection as required by CAO 107 AD/PHZL/14 Amdt 3 exceeds 450 hours time in service, perform blade inspection and compressive rolling prior to reaching 500 hours time in service or within 25 hours time in service from revised effective date of 20 July 1995, whichever occurs later.\n\nCOMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 \\- 107 CIVIL AVIATION SAFETY AUTHORITY\n\nSCHEDULE OF AIRWORTHINESS DIRECTIVES\n\nThereafter, reinspect at intervals not exceeding 500 hours time in service.\n\n2. c. If there are no records of compliance with CAO 107 AD/PHZL/14 Amdt 3 perform blade inspection and compressive rolling within 10 hours time in service from revised effective date of 20 July 1995.\n\nThereafter, reinspect at intervals not exceeding 500 hours time in service.\n\nBackground: The manufacturer has advised that due to cracking in the blade retention shoulder two recent blade separations have occurred. In addition the blade clamps from both failed blades contained a failed P/N A-282 clamp screw.\n\nThis amendment has been raised to delete reference to hub and blade shot peening previously called up in Hartzell cancelled SB 83 and reduces the blade re-inspection interval from 1000 to 500 hours time in service.","sortOrder":0}],"analysis":{"flash_summary_failed":{"failed":true,"reason":"A positive credit balance is required for all requests, including BYOK, so fallback providers remain available. Add credits at https://vercel.com/d?to=%2F%5Bteam%5D%2F%7E%2Fai%3Fmodal%3Dtop-up to continue.","source":"analysis-cron"},"flash_summary":{"complexity_score":4,"scope_assessment":{"changed":true,"description":"Yes. The amendment deletes the prior hub/blade shot‑peening requirement (cancelled Hartzell SB 83) and replaces blade treatment with compressive/cold rolling (Hartzell SB 118 referenced), while halving the blade re‑inspection interval from 1000 to 500 hours. This narrows the mandated treatment method and increases inspection frequency (Background; Note 2; Compliance)."},"complexity_factors":["Conditional compliance windows tied to prior inspection records (multiple timing branches: within 10 hours, within 25 hours, or before 500 hours) as set out in the Compliance paragraph.","Reliance on external technical documents: Hartzell Service Bulletin 202 (Procedures #1 and #2), references to Hartzell SB 118 and FAA ADs (Notes 1–2).","Recurring inspection requirement (reinspect at intervals not exceeding 500 hours), creating ongoing maintenance burden.","Applies across many aircraft makes and models, increasing administrative scope for fleet operators (Applicability list).","Technical maintenance action (compressive/cold rolling) requires qualified maintenance providers and specific tooling/skills.","Record-keeping sensitivity: absence of prior records triggers the shortest compliance window (10 hours).","Amendment alters prior mandated treatment (deletes hub/blade shot peening), so operators must track revised procedures and superseded bulletins."],"plain_english_summary":"This airworthiness directive requires owners/operators of aircraft fitted with specified Hartzell HC-92 propellers to have the propeller blades inspected and subjected to compressive (cold) rolling per Hartzell Service Bulletin 202. It removes an earlier shot‑peening requirement and shortens the mandatory re‑inspection interval to 500 hours.\n\nThe Civil Aviation Safety Authority enforces the directive; operators pay for the inspections/treatment and must meet varied deadlines depending on past inspection records. The change follows blade separations and clamp‑screw failures noted by the manufacturer."},"kimi_summary":{"content_quality":"ok","complexity_score":4,"scope_assessment":{"changed":true,"description":"This Amendment 4 significantly narrowed the scope from the original directive. The original AD (and Amendment 3) required \"shot peening\" of both hub and blades. This amendment removes the blade shot peening requirement entirely (replacing it with compressive rolling) and deletes the hub shot peening reference, focusing only on hub inspection and blade compressive rolling. It also tightened safety requirements by halving the re-inspection interval from 1,000 to 500 hours."},"complexity_factors":["Multiple conditional compliance pathways (3 separate scenarios in section 2.a, 2.b, and 2.c) based on maintenance history","Cross-references to superseded FAA ADs (95-11-08 and 73-02-01) and cancelled Hartzell Service Bulletins (83 and 118)","Reference to another Australian AD (CAO 107 AD/PHZL/43 Amdt 8) for related requirements","Technical aviation terminology requiring manufacturer-specific knowledge (\"time in service\", \"compressive rolling\", \"shot peening\", \"blade retention shoulder\")","Date calculations involving both absolute dates (20 July 1995) and flight hour accumulations","Nested applicability covering 14 different aircraft manufacturers and multiple models per manufacturer"],"plain_english_summary":"This CASA Airworthiness Directive mandates inspection and maintenance of certain Hartzell variable-pitch propellers (HC‑92WK/HC‑92ZK) on many light aircraft, requiring hub checks and compressive rolling of blades per Hartzell Service Bulletin 202.  \n\nIt responds to in‑flight blade separations from retention‑shoulder cracks, replaces prior shot‑peening with compressive rolling, and shortens inspection intervals (from 1,000 to 500 hours) with specific compliance deadlines tied to recent maintenance history."}},"importantCases":[],"_links":{"self":"/api/acts/ad-phzl-14-amdt-4-blade-and-hub-shot-peening","history":"/api/acts/ad-phzl-14-amdt-4-blade-and-hub-shot-peening/history","analysis":"/api/acts/ad-phzl-14-amdt-4-blade-and-hub-shot-peening/analysis","conflicts":"/api/acts/ad-phzl-14-amdt-4-blade-and-hub-shot-peening/conflicts","importantCases":"/api/acts/ad-phzl-14-amdt-4-blade-and-hub-shot-peening/important-cases","documents":"/api/acts/ad-phzl-14-amdt-4-blade-and-hub-shot-peening/documents"}}