{"id":"F2007L01390","name":"AD/CON/87 Amdt 2 - Superior Air Parts - Cylinder Assemblies","slug":"ad-con-87-amdt-2-superior-air-parts-cylinder-assemblies","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":65715,"registerId":"commonwealth-F2007L01390-current","compilationNumber":null,"startDate":"2026-04-02","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/87 Amdt 2 | Superior Air Parts - Cylinder Assemblies | 6/2007 |\n| ---------------- | ---------------------------------------- | ------ |\n\n| Applicability: | Teledyne Continental Motors (TCM) 470, 520, and 550 series reciprocating engines fitted with PMA cylinder assemblies manufactured by Superior Air Parts (SAP) between April 2005 and November 2005, with the following part numbers (P/Ns):SA47000L-A1, SA47000L-A20P, SA47000S-A1, SA47000S-A20P,SA47000S-A21P, SA52000-A1, SA52000-A20P, SA52000-A21P, SA52000-A22P, SA52000-A23P, SA55000-A1 or SA55000-A20P.These P/N cylinder assemblies may be installed in the following TCM engine models:• O-470 -G, -K, -L, -M, -P, -R, -S, -U• IO-470 -C, -D, -E, -F, -G, -H, -L, -M, -N, -P, -R, -S, -U, -V• IO-520 -A, B, BA, C, CB, D, E, F, J, K, L, M, BB, MB• TSIO-520 -AF, B, BB, C, CE, D, DB, E, EB, G, H, J, JB, K, KB, L, LB, M, N, NB, P, R, T, UB, VB, WB• IO-550 -A, B, C, D, E, F, LNote 1: A complete list of aircraft models, applicable TCM engines might be installed on, but not limited to, may be found in FAA Airworthiness Directive2007-04-19R1 Amendment 39-15005. |\n| -------------- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n| Requirement:   | 1. Determine the P/N of the cylinder assemblies installed. If your engine is fitted with affected cylinder assemblies P/N identified in the applicability list of the AD, check the serial numbers (S/N) of the cylinder assemblies in accordance with Superior Air Parts, Inc Mandatory Service Bulletin (MSB) B06-01 Revision E dated 24 January 2007.Remove from service any cylinder assemblies that are affected by both the applicability of this AD and the S/N as detailed in the procedure given in SAP MSB B06-01 Rev E.                                                                                                                                                                                                                                                                                                                                                                                                                                                      |\n\n|             | 2. Do not install any cylinder assembly with part numbers and serial numbers identified in Requirement 1 of this AD, into any engine.Note 2: FAA AD 2007-04-19R1 Amendment 39-15005 dated 23 March 2007 refers.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            |\n| ----------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ |\n| Compliance: | 1. Before cylinder assemblies reach 150 hours total time in service (TTIS).Note 3: For aircraft with engine cylinder assemblies that have greater than 150 hours TTIS, special flight permits may be issued to ferry the aircraft to a maintenance base.2. After the effective date of this AD.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            |\n|             | This Amendment becomes effective on 7 June 2007.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           |\n| Background: | This AD results from discovery of nine separated SAP cylinder assemblies installed in TCM 470, 520, and 550 series reciprocating engines and one separated SAP cylinder assembly installed in Lycoming Engines 320, 360, and 540 series engines. CASA is issuing this AD to prevent cylinder separation that can lead to engine failure, a possible engine compartment fire, and damage to the aeroplane.The current amendment corrects manufacturing date range based on Revision 1 of the FAA AD 2007-04-19 dated 23 March 2007 and makes a few editorial changes.Amendment 1 of this AD made reference to the cylinders assemblies detailed in the manufacturer’s service bulletin and became effective on 5 March 2007.The original issue of this AD became effective on 2 March 2007. |\n\n![](image.001.png)  \nDavid Punshon  \nDelegate of the Civil Aviation Safety Authority\n\n26 April 2007","sortOrder":0},{"sectionNumber":"AD/CON/87 Amdt 2","sectionType":"part","heading":"AD/CON/87 Amdt 2","content":"## AD/CON/87 Amdt 2","sortOrder":1},{"sectionNumber":"Superior Air Parts - Cylinder Assemblies","sectionType":"part","heading":"Superior Air Parts - Cylinder Assemblies","content":"## Superior Air Parts - Cylinder Assemblies","sortOrder":2},{"sectionNumber":"6/2007","sectionType":"part","heading":"6/2007","content":"## 6/2007","sortOrder":3}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":3,"scope_assessment":{"changed":false,"description":"This is Amendment 2 to an existing Airworthiness Directive. The amendments have remained tightly focused on the original safety issue (defective SAP cylinder assemblies). The changes from Amendment 1 and the original issue are minor: correcting the manufacturing date range based on updated FAA information and editorial adjustments. The scope has not expanded beyond the specific defective parts originally identified."},"complexity_factors":["Highly specific technical scope — applies only to 12 specific part numbers manufactured in a 7-month window (April–November 2005)","Extensive model list — 40+ specific engine model variants listed with hyphenated suffixes (-G, -K, -L, etc.)","Cross-reference dependency — compliance requires consulting an external document (Superior Air Parts MSB B06-01 Rev E) and references FAA AD 2007-04-19R1","Dual compliance trigger — based on both flight hours (150 hours TTIS) and calendar date (effective date)","Nested applicability — must match part number AND serial number ranges from the external service bulletin","Limited conditional relief — special flight permits mentioned for aircraft already over the 150-hour threshold"],"plain_english_summary":"This CASA Airworthiness Directive mandates owners/operators of certain Teledyne Continental Motors 470/520/550-series piston engines to inspect for and remove specific Superior Air Parts cylinder assemblies fitted April–November 2005. Affected cylinders must be checked against the manufacturer bulletin and removed if matched, and may not be reinstalled. It’s an emergency safety action after multiple in‑flight cylinder separations that risk engine failure, fire, and loss; compliance is required before affected cylinders reach 150 total hours."},"flash_summary":{"complexity_score":4,"scope_assessment":{"changed":false,"description":"This amendment corrects the manufacturing date range and makes editorial adjustments; it does not expand the AD’s substantive purpose. The directive remains focused on identifying and removing the specific SAP cylinder assemblies at risk of separation. The underlying scope—inspect, remove affected cylinders, and prohibit installation—remains the same as prior versions, with clarifications to the identifying data (manufacturing date range and reference to MSB Rev E)."},"complexity_factors":["Multiple affected part numbers (12 distinct P/Ns) across several engine model families (O-470, IO-470, IO-520, TSIO-520, IO-550)","Cross-reference dependency on an external document: Superior Air Parts Mandatory Service Bulletin B06-01 Revision E for S/N identification procedure","Cross-reference to FAA AD 2007-04-19R1 for related information","Conditional compliance timing (before 150 hours TTIS) with an explicit exception pathway (special flight permits to ferry aircraft with >150 hours)","Serial-number-level identification (requires tracing and record checks rather than a simple P/N ban)","Amendment history and corrected manufacturing date range (requires operators to follow the latest revision)","Practical inspection complexity (reading S/Ns may require partial disassembly/cowling removal)"],"plain_english_summary":"**What this instrument does (mechanics)\n\n- This Civil Aviation Safety Authority (CASA) airworthiness directive (AD) requires operators of certain piston engines to check whether cylinder assemblies fitted to their engines are from a specific set of Superior Air Parts (SAP) part numbers (P/Ns) manufactured between April and November 2005.  If a fitted cylinder has one of the listed P/Ns, the operator must check the cylinder serial number (S/N) against the list of affected S/Ns in Superior Air Parts Mandatory Service Bulletin (MSB) B06-01 Revision E (dated 24 January 2007).\n\n- Any cylinder assembly that matches both the affected P/N and an affected S/N in the MSB must be removed from service and must not be re-installed. The AD also prohibits installation of any affected cylinder assembly (those with the listed P/Ns and identified S/Ns).\n\n- The main compliance deadline is before each affected cylinder reaches 150 hours total time in service (TTIS). If an aircraft already has cylinders with more than 150 hours TTIS, a special flight permit may be issued to ferry the aircraft to a maintenance base for the required work.\n\n- The directive cross-references FAA AD 2007-04-19R1 and relies on the SAP mandatory service bulletin for the S/N identification procedure.\n\nWho is affected\n\n- Aircraft operators, owners, and maintenance organisations that operate or maintain Teledyne Continental Motors (TCM) 470, 520 and 550 series reciprocating engines fitted with SAP-manufactured PMA (Parts Manufacturer Approval) cylinder assemblies with the listed P/Ns (SA47000L-A1; SA47000L-A20P; SA47000S-A1; SA47000S-A20P; SA47000S-A21P; SA52000-A1; SA52000-A20P; SA52000-A21P; SA52000-A22P; SA52000-A23P; SA55000-A1; SA55000-A20P) manufactured in the specified date window.\n\n- Those P/Ns may be installed across a wide range of TCM engine model variants (O-470, IO-470, IO-520, TSIO-520 and IO-550 series) and therefore on multiple aircraft types.\n\nWhy it matters (stated safety risk and operational effects)\n\n- The AD was issued because of discovered incidents of cylinder separation (a cylinder detaching) in-service. Cylinder separation can lead to engine failure, possible engine compartment fire, and damage to the aircraft.\n\n- Mechanically, the AD forces operators to inspect, trace P/Ns and S/Ns, remove any identified unsafe components, and stop installing those components. That produces direct costs (inspection time, parts removal, replacement cylinder purchases, and aircraft downtime) and administrative burden (record checks against the MSB list). It also creates a short-term operational effect: aircraft with affected cylinders may need to be ferried under special permit to a maintenance facility or grounded until compliant replacements are installed.\n\nAnalytical lens (who pays, who decides, and likely behavioural effects)\n\n- Who pays: the direct costs fall on aircraft owners/operators and maintenance providers (inspection labour, replacement cylinders, downtime). Indirect costs can include scheduling disruption and possible ferrying expenses.\n\n- Who decides and enforces: CASA issues the AD and enforces compliance. Superior Air Parts supplies the identification procedure and S/N list via its Mandatory Service Bulletin; operators follow that MSB to identify affected units.\n\n- Behavioural changes induced: operators will (a) check P/N and S/N records and physical markings more carefully, (b) remove and replace identified cylinders, and (c) avoid installing the affected P/N/S/N combinations in any engines. Over time operators may prefer alternative cylinder suppliers or monitor supplier conformity more closely.\n\nCosts, incentives and implementation risks\n\n- Compliance cost and burden: operators must locate and verify cylinder S/Ns, potentially removing cowls and performing partial disassembly to read markings; they must acquire replacement parts and book maintenance slots. Small operators or owner-maintainers face proportionally higher per-aircraft costs.\n\n- Dependence on manufacturer data: the AD’s effectiveness depends on the accuracy and completeness of SAP MSB B06-01 Rev E. If S/N lists are incomplete or mis-stated, affected cylinders could be missed, or safe cylinders could be unnecessarily retired.\n\n- Concentration of benefits and costs: the safety benefit (reduced risk of separation) accrues broadly to aircraft occupants and third parties; the financial costs are concentrated on owners/operators of aircraft with the identified cylinder assemblies.\n\n- Substitution effects: operators may switch to non-SAP cylinder assemblies or to maintenance practices aimed at earlier detection of cylinder deterioration.\n\n- Enforcement and operational risk: CASA compliance checks and the prohibition on installing affected cylinders create a compliance risk for operators who fail to trace or replace units; special permits for ferry flights are available to manage short-term operational needs.\n\nSource claims and adjustments: the AD states the safety rationale (reported separated cylinders) and corrects a manufacturing date range from a prior amendment. Those statements form the documented basis for the measures; the AD relies on the SAP MSB for the concrete identification procedure and on FAA AD 2007-04-19R1 for related guidance."},"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"}},"importantCases":[],"_links":{"self":"/api/acts/ad-con-87-amdt-2-superior-air-parts-cylinder-assemblies","history":"/api/acts/ad-con-87-amdt-2-superior-air-parts-cylinder-assemblies/history","analysis":"/api/acts/ad-con-87-amdt-2-superior-air-parts-cylinder-assemblies/analysis","conflicts":"/api/acts/ad-con-87-amdt-2-superior-air-parts-cylinder-assemblies/conflicts","importantCases":"/api/acts/ad-con-87-amdt-2-superior-air-parts-cylinder-assemblies/important-cases","documents":"/api/acts/ad-con-87-amdt-2-superior-air-parts-cylinder-assemblies/documents"}}