{"id":"F2006B06218","name":"AD/PHZL/57 Amdt 2 - Blade Tip Stalling","slug":"ad-phzl-57-amdt-2-blade-tip-stalling","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":47122,"registerId":"commonwealth-F2006B06218-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/PHZL/57 Amdt 2 - Blade Tip Stalling","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/57\n\nAmdt 2\n\n  \nBlade Tip Stalling 12/88\n\nApplicability: All Hartzell propeller models HC-B4TN-5( ) L/LT 10574(B) or HC-B4TN-5( ) L/LT10574A(B) or HC-B4TN-5( ) L/LT10574AS(B) installed on Dornier DO-228- 100 or 200 with Garrett engine model TPE-331-5-252D.\n\nRequirement: Action in accordance with Hartzell Service Bulletin No 140F and Hartzell Service Instruction 167D, as applicable.\n\nNote: Dornier Telex AOT/228/87/017 and FAA AD 87-15-05 R1 refer.\n\nCompliance: 1. Inspect blades daily in accordance with Hartzell Service Bulletin 140F.\n\nNote: Certification of this inspection by pilots is not acceptable unless they hold a Maintenance Authority for this purpose.\n\n2. Within 100 hours time in service after 25 February 1988 or by 25 August 1988 whichever occurs first in accordance with Hartzell SB 140F. Thereafter, reinspect at intervals not exceeding 100 hrs TIS.\n\nBackground: During the landing run use of the ‘Beta’ range above 55 KIAS could result in blade tip stalling. If this condition is encountered higher than normal blade stresses will be introduced which may result in cracking of the propeller blades. This amendment raised to incorporate latest edition of manufacturer’s data which changes the blade tip inspection area. This Directive is further amended to incorporate manufacturers requirements which delete applicability for some blade models.","sortOrder":0}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":3,"scope_assessment":{"changed":true,"description":"The original directive has been narrowed in scope. Amendment 2 explicitly 'delete[s] applicability for some blade models' — meaning fewer propellers are now captured by this safety requirement than in the original version. This represents a scope reduction based on updated manufacturer data, rather than expansion."},"complexity_factors":["Multiple specific model numbers requiring careful cross-referencing (HC-B4TN-5 variants with different suffix codes)","External document incorporation by reference (Hartzell Service Bulletin 140F and Service Instruction 167D — not reproduced in the directive itself)","Dual compliance deadlines with 'whichever occurs first' logic (100 hours TIS vs. calendar date)","Conditional applicability changes in Amendment 2 (deletion of some blade models from scope)","Technical aviation terminology requiring domain knowledge ('Beta range', 'KIAS', 'time in service', 'Maintenance Authority')"],"plain_english_summary":"This CASA Airworthiness Directive mandates mandatory inspections of specific Hartzell HC-B4TN-5-series propellers on Dornier DO-228s with Garrett TPE-331-5-252D engines to prevent blade-tip stalling and cracking caused by using Beta above 55 KIAS.  \n\nIt requires daily checks to Hartzell Service Bulletin 140F (certified by qualified maintenance personnel) and a full inspection within 100 flight hours, then every 100 hours thereafter. Amendment 2 updates the blade-tip inspection area and removes certain blade models from the requirement."},"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":true,"description":"The amendment updates manufacturer data that changes the blade tip inspection area and deletes applicability for some blade models, narrowing the population of affected propellers compared to the original directive."},"complexity_factors":["Technical specificity: identifies precise propeller and engine model combinations (applicability).","Cross-references: mandates compliance with manufacturer documents (Hartzell SB 140F and SI 167D) rather than prescribing inspection steps in the directive.","Temporal and interval requirements: initial compliance deadline (100 hrs TIS or calendar date) plus recurring 100‑hour inspection interval.","Certification constraint: only holders of a Maintenance Authority may certify inspections (limits who can sign off).","Amendment effects: updates inspection area and removes applicability for some blade models, requiring operators to reconcile earlier compliance with new scope."],"plain_english_summary":"This airworthiness directive requires operators of Dornier DO-228-100/200 aircraft fitted with specified Hartzell HC-B4TN-5( ) propellers and Garrett TPE‑331‑5‑252D engines to follow Hartzell Service Bulletin No.140F and Service Instruction 167D: conduct daily blade inspections, perform an initial inspection within 100 hours time‑in‑service or by 25 Aug 1988 (whichever first), and thereafter every 100 hours. Pilots may not certify these inspections unless they hold a Maintenance Authority. The amendment updates the blade tip inspection area and narrows applicability for some blade models."}},"importantCases":[],"_links":{"self":"/api/acts/ad-phzl-57-amdt-2-blade-tip-stalling","history":"/api/acts/ad-phzl-57-amdt-2-blade-tip-stalling/history","analysis":"/api/acts/ad-phzl-57-amdt-2-blade-tip-stalling/analysis","conflicts":"/api/acts/ad-phzl-57-amdt-2-blade-tip-stalling/conflicts","importantCases":"/api/acts/ad-phzl-57-amdt-2-blade-tip-stalling/important-cases","documents":"/api/acts/ad-phzl-57-amdt-2-blade-tip-stalling/documents"}}