{"id":"F2007L01391","name":"AD/LYC/118 Amdt 2 - Superior Air Parts - Cylinder Assemblies","slug":"ad-lyc-118-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":65718,"registerId":"commonwealth-F2007L01391-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"Lycoming Piston Engines","sectionType":"division","heading":"Lycoming Piston Engines","content":"### Lycoming Piston Engines\n\n| AD/LYC/118 Amdt 2 | Superior Air Parts - Cylinder Assemblies | 6/2007 |\n| ----------------- | ---------------------------------------- | ------ |\n\n| Applicability: | Lycoming Engines 320, 360, and 540 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):SL32000W-A1, SL32000W-A20P, SL32000W-A21P, SL32000WH-A1, SL32000WH-A20P, SL32006W-A1, SL32006W-A20P, SL32006W-A21P, SL36000TW-A1, SL36000TW-A20P, SL36000TW-A21P, SL36000TW-A22P, SL36000W-A1, SL36000W-A20P, SL36000W-A21P, SL36006W-A1,SL36006W-A20P, or SL36006W-A21P.These P/N cylinder assemblies may be installed in the following Lycoming engine models:• AEIO-320 -D, -E• AEIO-360 -B, -H• AEIO-540 -D• AIO-320 -A, -B, -C• HIO-360 -B• HO-360 -C• IO-320 -B, -D, -E• IO-360 -B, -L, -M• IO-540 -A, -C, -D, -N, -T, -V, -W• LIO-320 -B• LO-360 -A• O-320 -A, -B, -C, -D, -E, -H• O-360 -A, -B, -C, -D, -F, -G, -J• O-540 -A, -B, -E, -F, -G, -H, -JNote 1: A complete list of aircraft models, applicable Lycoming engines might be installed on, but not limited to, may be found in FAA Airworthiness Directive2007-04-19R1 amendment 39-15005 dated 23 March 2007. |\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.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 2007-04-19 R1 Amendment 39-15005 dated 23 March 2007 refers.                                                                                                                                                                                                                                                                                                                                                        |\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 airplane.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.The 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/LYC/118 Amdt 2","sectionType":"part","heading":"AD/LYC/118 Amdt 2","content":"## AD/LYC/118 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":{"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":true,"description":"The amendment corrects the manufacturing date range and makes editorial changes, refining applicability of the AD (per the Background: \"current amendment corrects manufacturing date range based on Revision 1 of the FAA AD dated 23 March 2007\"). The core requirement—to identify, remove, and prohibit installation of affected cylinders—remains in force; the change narrows/refines which cylinders fall within that scope."},"complexity_factors":["Long list of affected part numbers and many engine/aircraft models to check, increasing tracing effort","Requirement to check serial numbers against manufacturer Mandatory Service Bulletin B06‑01 Rev E (cross-reference dependency)","Compliance timing: action must occur before 150 hours TTIS, with limited allowance for special ferry permits","Prohibition on reinstalling identified P/N/S/N combinations requires parts control and supply substitution","Cross-reference to FAA AD for background and corrected manufacturing date range (coordination between regulators/manufacturer)"],"plain_english_summary":"**What it does:** This AD requires operators to identify specific Superior Air Parts cylinder assemblies (listed P/Ns manufactured April–November 2005) fitted to certain Lycoming 320/360/540 engines, check their serial numbers per Superior Air Parts Mandatory Service Bulletin B06‑01 Rev E, remove any affected cylinders and prohibit installing them. \n\n**Who pays / why it matters:** Compliance must occur before affected cylinders reach 150 hours TTIS; aircraft owners/operators bear inspection and replacement costs. CASA issued the directive to prevent cylinder separation and possible engine failure."},"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"},"kimi_summary":{"content_quality":"ok","complexity_score":4,"scope_assessment":{"changed":false,"description":"This remains a targeted safety directive addressing a specific manufacturing defect in Superior Air Parts cylinder assemblies. The amendments have refined the applicability (correcting manufacturing dates) and made editorial improvements, but have not expanded beyond the original purpose of preventing cylinder separation in affected Lycoming engines."},"complexity_factors":["Extensive list of 21 specific part numbers (P/Ns) in applicability section","Cross-reference to external manufacturer service bulletin (SAP MSB B06-01 Rev E) for serial number identification — operators must consult a separate document to determine compliance","Nested applicability: must match both part number AND serial number to trigger removal requirement","Reference to FAA Airworthiness Directive (2007-04-19 R1) for additional aircraft model information","Conditional compliance timeline based on hours in service (150 hours TTIS threshold) with exception for ferry permits","Multiple amendments with background explaining evolution from original issue through Amendment 1 to current Amendment 2"],"plain_english_summary":"This AD mandates removal and grounding of certain Superior Air Parts cylinder assemblies installed on Lycoming 320/360/540-series piston engines because some cylinders (manufactured Apr–Nov 2005) can separate in flight, risking engine failure, fire, and aircraft damage. Owners/operators must check P/Ns and S/Ns per SAP MSB B06‑01 Rev E, remove affected cylinders, and not reinstall them — before 150 hours TTIS (or fly only under special permit to reach repairs). This is Amendment 2 correcting the date range."}},"importantCases":[],"_links":{"self":"/api/acts/ad-lyc-118-amdt-2-superior-air-parts-cylinder-assemblies","history":"/api/acts/ad-lyc-118-amdt-2-superior-air-parts-cylinder-assemblies/history","analysis":"/api/acts/ad-lyc-118-amdt-2-superior-air-parts-cylinder-assemblies/analysis","conflicts":"/api/acts/ad-lyc-118-amdt-2-superior-air-parts-cylinder-assemblies/conflicts","importantCases":"/api/acts/ad-lyc-118-amdt-2-superior-air-parts-cylinder-assemblies/important-cases","documents":"/api/acts/ad-lyc-118-amdt-2-superior-air-parts-cylinder-assemblies/documents"}}