{"id":"F2006B08650","name":"AD/CON/74 - Turbocharger Oil Output Check Valve","slug":"ad-con-74-turbocharger-oil-output-check-valve","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":51713,"registerId":"commonwealth-F2006B08650-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/CON/74 - Turbocharger Oil Output Check Valve","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)  \nTeledyne Continental Motors Piston Engines\n\nAD/CON/74 Turbocharger Oil Output Check Valve 7/95 DM\n\nApplicability: All Teledyne Continental Motors (TCM) model TSIO-360-E, EB, F, FB, G, GB, KB, LB, MB and model LTSIO-360-E, EB and KB engines which have had a Dukes Incorporated turbocharger oil outlet check valve P/N 367-00 (TCM P/N 641068) installed or repaired on or after 1 August 1994.\n\nRequirement: 1. Inspect the turbocharger oil outlet check valve (TCM P/N 641068) in accordance with Section B of TCM Critical Service Bulletin (CSB) 95-1, Revision A.\n\n2. Replace valves which are identified with an ink stamp date code of A3Q94, A4Q94, A1Q95 or the date code is not readable, before further flight.\n\nNote: FAA Airworthiness Directive 95-08-10 refers.\n\nCompliance: Effective 10 May 1995; prior to further flight.\n\nBackground: This Directive has been issued to require an inspection of certain turbocharger oil outlet check valves. The requirement follows advice that certain oil outlet check valves were manufactured by Dukes Incorporated contrary to manufacturing specifications. Failure of affected valves could result in damage to the engine oil scavenge pump, internal engine damage and subsequent loss of engine power.","sortOrder":0}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a targeted airworthiness directive addressing a specific manufacturing defect in a specific aircraft component. The scope remains precisely limited to the identified safety issue with the Dukes Incorporated turbocharger oil outlet check valves. No scope creep is evident."},"complexity_factors":["Single, specific mechanical part targeted (turbocharger oil outlet check valve)","Limited applicability: only 11 specific engine models and only if valve installed/repaired after specific date","Two straightforward requirements: inspect per referenced bulletin, replace if date codes match","Only 4 specific date codes to check, plus unreadable codes","No nested exceptions, conditional logic, or extensive cross-referencing beyond one referenced FAA directive and one TCM service bulletin","Short document (approximately 200 words)"],"plain_english_summary":"This CASA safety order requires owners/operators of specified Teledyne Continental TSIO-360 and LTSIO-360 engine variants to inspect the turbocharger oil outlet check valve (P/N 641068) if it was installed or repaired after 1 Aug 1994, and to replace any valve bearing date codes A3Q94, A4Q94, A1Q95 or with an unreadable code before the aircraft next flies. Defective valves can damage the oil pump and engine, risking total engine failure; compliance is immediate (effective 10 May 1995)."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The directive's scope is limited to the listed TCM engine models and to units that had the specified Dukes/TCM check valve installed or repaired on or after 1 August 1994. The text shows no expansion or narrowing beyond those applicability criteria and the specified inspection/replacement requirements."},"complexity_factors":["Narrow technical scope: applies only to specific TCM TSIO-360 and LTSIO-360 engine models and a single check valve part number (Applicability).","Date-code identification: compliance hinges on reading or recognising specific ink stamp date codes (Requirement).","Cross-reference to manufacturer procedure: inspection must follow TCM CSB 95-1 Revision A, adding procedural reliance on an external document (Requirement).","Immediate operational constraint: mandatory compliance 'prior to further flight' imposes urgent scheduling and potential downtime (Compliance).","Replacement rule: valves with listed date codes or unreadable codes must be replaced rather than repaired, creating direct parts cost and logistics.","Safety consequence linkage: directive responds to manufacturing deviations that can lead to scavenge pump damage and loss of engine power, raising stakes for accurate inspection (Background).","Cross-regulatory reference: note refers to FAA AD 95-08-10, creating potential international compliance implications (Note)."],"plain_english_summary":"This directive requires operators of Teledyne Continental TSIO-360 and LTSIO-360 engines that had a Dukes P/N 367-00 (TCM P/N 641068) turbocharger oil outlet check valve installed or repaired on or after 1 August 1994 to inspect the valve per TCM Critical Service Bulletin 95-1 Rev A and to replace valves stamped A3Q94, A4Q94, A1Q95 or with unreadable date codes before further flight (Applicability; Requirement; Compliance). Aircraft owners/operators must pay for and carry out the inspection/replacement; CASA issued the directive because affected valves may have been made outside specifications and can cause engine damage (Background)."}},"importantCases":[],"_links":{"self":"/api/acts/ad-con-74-turbocharger-oil-output-check-valve","history":"/api/acts/ad-con-74-turbocharger-oil-output-check-valve/history","analysis":"/api/acts/ad-con-74-turbocharger-oil-output-check-valve/analysis","conflicts":"/api/acts/ad-con-74-turbocharger-oil-output-check-valve/conflicts","importantCases":"/api/acts/ad-con-74-turbocharger-oil-output-check-valve/important-cases","documents":"/api/acts/ad-con-74-turbocharger-oil-output-check-valve/documents"}}