{"id":"F2006B07445","name":"AD/TPE 331/35 - Second Stage Stator Assembly","slug":"ad-tpe-331-35-second-stage-stator-assembly","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":49758,"registerId":"commonwealth-F2006B07445-current","compilationNumber":null,"startDate":"2026-04-02","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/TPE 331/35 - Second Stage Stator Assembly","content":"COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 \\- 106 CIVIL AVIATION SAFETY AUTHORITY\n\nSCHEDULE OF AIRWORTHINESS DIRECTIVES\n\n![](image.001.png)  \nAlliedSignal (Garrett/AiResearch) Turbine Engines \\- TPE 331 Series\n\nAD/TPE 331/35 Second Stage Stator Assembly 10/87\n\nTX\n\nApplicability: TPE 331-25, \\-43, \\-47, \\-55 and \\-61 series engines as listed in the Requirement Document.\n\nRequirement: Radiographically inspect the second stage stator assembly, to determine if air jets have been assembled correctly, in accordance with GTEC SB TPE 331-A72-0560 dated 1 July 1987.\n\nCompliance: Unless already accomplished, at 500 hours time since overhaul or within 200 hours of operation after 3 August 1987 whichever is the later.\n\nBackground: This Directive is issued to prevent second stage rotor assembly failure resulting from incorrectly assembled air jets in the second stage stator.\n\nAttention of operators of applicable engines is drawn to GTEC SB TPE 331-A72- 0522-AD/TPE 331/33 Amdt 3 which requires a repetitive radiographic isotope inspection of the second stage stator to determine the clearance between the second stage seal plate assembly and the second stage rotor.","sortOrder":0}],"analysis":{"kimi_summary":{"_metrics":{"model":"kimi-k2.5","source":"moonshot-batch","completionTokens":1489},"content_quality":"ok","complexity_score":3,"scope_assessment":{"changed":false,"description":"The directive remains precisely focused on its original safety purpose: mandating radiographic inspection for a specific manufacturing defect in enumerated engine models. No scope expansion beyond the original mechanical safety issue is evident."},"complexity_factors":["Technical aviation terminology requiring specialized engineering knowledge (e.g., 'radiographic inspection', 'second stage stator assembly', 'air jets')","Cross-reference to external technical service bulletin (GTEC SB TPE 331-A72-0560) dated 1 July 1987","Conditional compliance deadline with alternative triggers (500 hours since overhaul OR 200 hours after specific date, whichever is later)","Specific applicability limited to five enumerated engine sub-series"],"plain_english_summary":"This directive requires owners/operators of AlliedSignal TPE331-25, -43, -47, -55, and -61 engines (used on turboprops like King Airs and Metroliners) to perform an X‑ray (radiographic) inspection of the second‑stage stator assembly to verify correct assembly of internal air jets.  \n\nThe inspection must be done at 500 hours since overhaul or within 200 hours after 3 August 1987, whichever is later—to prevent rotor failure and catastrophic engine loss of power."}},"importantCases":[],"_links":{"self":"/api/acts/ad-tpe-331-35-second-stage-stator-assembly","history":"/api/acts/ad-tpe-331-35-second-stage-stator-assembly/history","analysis":"/api/acts/ad-tpe-331-35-second-stage-stator-assembly/analysis","conflicts":"/api/acts/ad-tpe-331-35-second-stage-stator-assembly/conflicts","importantCases":"/api/acts/ad-tpe-331-35-second-stage-stator-assembly/important-cases","documents":"/api/acts/ad-tpe-331-35-second-stage-stator-assembly/documents"}}