{"id":"F2006B06201","name":"AD/PHS/8 - Counterweight Bearing Shaft - Inspection","slug":"ad-phs-8-counterweight-bearing-shaft-inspection","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":47078,"registerId":"commonwealth-F2006B06201-current","compilationNumber":null,"startDate":"2026-04-02","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/PHS/8 - Counterweight Bearing Shaft - 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 \\- Hamilton Standard\n\nAD/PHS/8 Counterweight Bearing Shaft \\- Inspection 12/65\n\nApplicability: All model 2D30, 3D40 and 12D40.\n\nRequirement: 1. Remove the propeller counterweight cap, counterweight adjusting screw and nuts.\n\n    2. Remove grease from head of shaft P/N 53546.\n\n    3. Examine head of shaft for all of the following marks: “53546J”, “XLO” (contained in an oval stamp) and “SK”.\n    4. Remove any shaft so marked for hardness testing. The shaft should be 26.6 to 32.6 Rockwell “C” scale. Any shaft not meeting this figure shall be rejected.\n\nNote: To facilitate examination of the shaft head remove split pin locking the shaft and rotate shaft with Allen key.\n\nor AD/PHAM/1.\n\nCompliance: Within 100 hours time in service after 15 February 1966.","sortOrder":0}],"analysis":{"kimi_summary":{"_metrics":{"model":"kimi-k2.5","source":"moonshot-batch","completionTokens":1483},"content_quality":"ok","complexity_score":3,"scope_assessment":{"changed":false,"description":"The directive maintains its original narrow, safety-critical scope: mandatory inspection of specific Hamilton Standard propeller counterweight bearing shafts to identify manufacturing defects. There is no evidence of scope expansion beyond the original technical safety purpose."},"complexity_factors":["Technical aviation part numbering (P/N 53546) and proprietary model designations (2D30, 3D40, 12D40)","Specialized metallurgical testing requirement (Rockwell C hardness scale 26.6-32.6)","Cross-reference to alternative compliance pathway (AD/PHAM/1)","Dual compliance metric combining flight hours ('time in service') with calendar date","Specific visual identification marks requiring technical interpretation ('XLO' in oval stamp)"],"plain_english_summary":"This Airworthiness Directive requires owners/operators and maintenance personnel of aircraft with Hamilton Standard variable‑pitch propellers (models 2D30, 3D40, 12D40) to inspect counterweight bearing shafts for specific manufacturer marks and verify proper heat treatment by Rockwell C hardness testing. Shafts bearing the marks that fail the hardness range must be removed and replaced. The rule (original compliance within 100 flight hours after 15 Feb 1966) prevents shaft failure and loss of propeller control."}},"importantCases":[],"_links":{"self":"/api/acts/ad-phs-8-counterweight-bearing-shaft-inspection","history":"/api/acts/ad-phs-8-counterweight-bearing-shaft-inspection/history","analysis":"/api/acts/ad-phs-8-counterweight-bearing-shaft-inspection/analysis","conflicts":"/api/acts/ad-phs-8-counterweight-bearing-shaft-inspection/conflicts","importantCases":"/api/acts/ad-phs-8-counterweight-bearing-shaft-inspection/important-cases","documents":"/api/acts/ad-phs-8-counterweight-bearing-shaft-inspection/documents"}}