{"id":"F2007L02723","name":"AD/CON/88 - Kelly Aerospace Turbochargers","slug":"ad-con-88-kelly-aerospace-turbochargers","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":169454,"registerId":"commonwealth-F2007L02723-current","compilationNumber":null,"startDate":"2026-04-04","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"Teledyne Continental Motors Piston Engin","sectionType":"division","heading":"Teledyne Continental Motors Piston Engines","content":"### Teledyne Continental Motors Piston Engines\n\n| AD/CON/88 | Kelly Aerospace Turbochargers | 11/2007 TX |\n| --------- | ----------------------------- | ---------- |\n\n| Applicability: | Teledyne Continental Motors (TCM) models TSIO-520-BE, TSIO- 550-A, TSIO-550-B, TSIO-550-C, TSIO-550-E, and TSIO-550-G reciprocating engines with a Kelly Aerospace Power Systems turbocharger, TCM part number (P/N) 646677, with certain serial numbers (SNs), installed on or after 20 March 2007.Note 1: These engines are installed on, but not limited to, Adam Aircraft A500, Columbia Aircraft Manufacturing LC41-550FG, Mooney Aeroplane Company M20TN (Acclaim), and Piper Aircraft Incorporated PA-46-310P (Malibu) aeroplanes.TCM IO-550-N reciprocating engines modified to Engine Technologies Incorporated supplemental type certificate (STC) SE10589SC to install turbocharger, P/N 466304-0003, with certain SNs, installed on or after 20 March 2007.Note 2: These engines are installed on, but not limited to, Cirrus Design Corporation Aircraft Model SR22 modified to Engine Technologies Incorporated STC SA10588SC.Use Kelly Aerospace Power Systems Service Bulletins No. 026, Revision B, dated 27 July 2007, and No. 027, dated 25 July 2007, to determine if there is an affected turbocharger installed.For any turbocharger that was installed before 20 March 2007, no further action is required. |\n| -------------- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n| Requirement:   | 1. For Engines Modified to Engine Technologies Incorporated STC SE10589SC, replace the turbocharger.2. For TCM Engines with Turbocharger TCM P/N 646677, replace the turbocharger.Note 3: Teledyne Continental Aircraft Engine Mandatory Service Bulletin (MSB) MSB07-4, dated 30 July 2007, contains additional information on replacing turbochargers on TCM engines and Cirrus Service Advisory SA 07-14 R1, dated 24 July 2007, contains additional information on replacing turbochargers on Cirrus Design Corporation Aircraft Model SR22 modified to Engine Technologies Incorporated STC SA10588SC.Note 4: FAA AD 2007-16-10 Amdt 39-15149 dated 1 August 2007 refers.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     |\n| Compliance:    | 1. Before further flight, for engines modified to Engine Technologies Incorporated STC SE10589SC on or after March 20, 2007, with a turbocharger that has a SN listed in Kelly Aerospace Service Bulletin (SB) No. 026, Revision B, dated 27 July 2007.2. Before further flight, for engines with a Kelly Aerospace Power Systems turbocharger, TCM P/N 646677 installed on or after 20 March 2007, with a turbocharger SN listed in Kelly Aerospace SB No. 027.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   |\n|                | This Airworthiness Directive becomes effective on 30 August 2007.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  |\n| Background:    | This AD results from four incidents of the turbine rotor separating from the shaft of the turbocharger. The actions detailed in this AD are to prevent the turbine rotor from separating from the shaft of the turbocharger due to a machining defect in the turbocharger compressor. This condition could result in full engine power loss, loss of engine lubricant, or smoke in the aeroplane cabin.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            |\n\n![](image.001.png)  \nCharles Lenarcic  \nDelegate of the Civil Aviation Safety Authority\n\n27 August 2007","sortOrder":0},{"sectionNumber":"AD/CON/88","sectionType":"part","heading":"AD/CON/88","content":"## AD/CON/88","sortOrder":1},{"sectionNumber":"Kelly Aerospace Turbochargers","sectionType":"part","heading":"Kelly Aerospace Turbochargers","content":"## Kelly Aerospace Turbochargers","sortOrder":2},{"sectionNumber":"11/2007 TX","sectionType":"part","heading":"11/2007 TX","content":"## 11/2007 TX","sortOrder":3}],"analysis":{"flash_summary":{"complexity_score":5,"scope_assessment":{"changed":false,"description":"Scope targets specific turbochargers (by P/N and listed SNs) on named TCM engine models and engines modified under specified STCs, installed on or after 20 March 2007, and mandates replacement before further flight where listed (Applicability; Requirement). The instrument confines action to those identified installations and does not broaden applicability beyond the defect-related set of parts and installations."},"complexity_factors":["Serial-number-limited applicability requiring operators to check SB lists (Applicability)","Multiple engine models and aftermarket STCs referenced, increasing verification steps (Applicability)","Immediate compliance timing — 'before further flight' for affected installations (Compliance)","Dependence on external documents (Kelly SBs, TCM MSB, Cirrus advisory, FAA AD) for identification and procedures (Applicability; Requirement)","Exception for turbochargers installed before 20 March 2007 adds a date-based carve-out (Applicability)","Operational logistics and replacement costs borne by aircraft operators/owners (Requirement; Compliance)"],"plain_english_summary":"This **Airworthiness Directive** requires replacement, before further flight, of certain Kelly Aerospace turbochargers fitted to specified Teledyne Continental Motors piston engines or to TCM engines modified under listed STCs, when the turbocharger serial numbers appear in Kelly service bulletins and were installed on or after 20 March 2007. The AD says the replacement addresses a compressor machining defect that has led to turbine-rotor separation, which could cause engine power loss, loss of engine lubricant, or cabin smoke (Background)."},"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"},"kimi_summary":{"content_quality":"ok","complexity_score":3,"scope_assessment":{"changed":false,"description":"This is a standard, targeted Airworthiness Directive addressing a specific safety defect in a specific component. The scope remains tightly focused on the identified turbocharger defect and has not expanded beyond its original safety purpose."},"complexity_factors":["Multiple overlapping applicability criteria (engine models, part numbers, serial numbers, installation dates, STC modifications)","Cross-references to four external documents (two Kelly Aerospace Service Bulletins, one TCM Mandatory Service Bulletin, one Cirrus Service Advisory, and one FAA AD)","Two distinct compliance pathways depending on engine modification status","Date-based exemption clause (pre-20 March 2007 installations exempted)","Nested applicability notes (Note 1 and Note 2 listing example aircraft types)"],"plain_english_summary":"This AD requires immediate replacement, before further flight, of certain Kelly Aerospace turbochargers installed on specified Teledyne Continental Motors piston engines (installed on or after 20 March 2007). It affects owners/operators of aircraft using those engines—commonly Adam A500, Columbia LC41-550FG, Mooney M20TN Acclaim, Piper Malibu, and Cirrus SR22.\n\nUrgency follows four incidents of turbine-rotor separation from a machining defect that can cause engine failure, oil loss, or cabin smoke; operators must check Kelly service bulletins to confirm affected serial numbers."}},"importantCases":[],"_links":{"self":"/api/acts/ad-con-88-kelly-aerospace-turbochargers","history":"/api/acts/ad-con-88-kelly-aerospace-turbochargers/history","analysis":"/api/acts/ad-con-88-kelly-aerospace-turbochargers/analysis","conflicts":"/api/acts/ad-con-88-kelly-aerospace-turbochargers/conflicts","importantCases":"/api/acts/ad-con-88-kelly-aerospace-turbochargers/important-cases","documents":"/api/acts/ad-con-88-kelly-aerospace-turbochargers/documents"}}