# AD 2006-12-07: ECi cylinder assemblies

- Type: Airworthiness directive
- Status: Current
- Products: Aerostar AEIO-320-D1B, AEIO-320-D2B, AEIO-320-E1A, AEIO-320-E1B, AEIO-320-E2A, AEIO-320-E2B, AEIO-360-B1B, AEIO-360-B1D, AEIO-360-B1F, AEIO-360-B1F6, AEIO-360-B1G6, AEIO-360-B1H and 377 more
- Effective: July 11, 2006
- Published: June 6, 2006, 71 FR 32427–32434
- Issued: May 31, 2006
- Issued as: Final rule
- Supersedes: [AD 2005-26-10](https://openairdocs.org/ad/2005-26-10)
- Superseded by: Nothing supersedes this AD
- Product type: Appliance
- Amendment: 39-14632
- Docket: FAA-2005-22358 (https://www.regulations.gov/docket/FAA-2005-22358)
- Project: 2005-NE-20-AD
- Registered aircraft: 84,966 may be affected, by airframe or engine model (OpenAirDocs)
- Official PDF: https://openairdocs.org/files/sha256/6b/13/6b131682088afb650ea73bdd2b49a6efdc87612ad63481e8bd4eafc4f43c8cc8 (from https://www.govinfo.gov/content/pkg/FR-2006-06-06/pdf/06-5127.pdf)
- Federal Register: https://www.federalregister.gov/documents/2006/06/06/06-5127/airworthiness-directives-engine-components-inc-eci-reciprocating-engine-cylinder-assemblies
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/076CBE0678C2D2398625718500504687.0001
- DRS record last changed: November 21, 2025
- Page: https://openairdocs.org/ad/2006-12-07

## Summary

The FAA is superseding an existing airworthiness directive (AD) for Lycoming Engines (formerly Textron Lycoming) models 320, 360, and 540 series, “Parallel Valve” reciprocating engines, with certain Engine Components Inc. (ECi) cylinder assemblies, part number (P/N) AEL65102 series “Classic Cast”, installed. That AD currently requires replacing these ECi cylinder assemblies. This AD requires the same actions, but replaces the “Engine Models” Table 1 and “Engines Installed On, But Not Limited To” Table 2 with corrected tables. Also, this AD corrects the casting part number. This AD results from reports of applicability errors found in AD 2005-26-10. We are issuing this AD to prevent loss of engine power due to cracks in the cylinder assemblies and possible engine failure caused by separation of a cylinder head.

## The airworthiness directive

### Adoption of the Amendment

Accordingly, under the authority delegated to me by the Administrator, the Federal Aviation Administration amends 14 CFR part 39 as follows:

1. The authority citation for part 39 continues to read as follows:

2. The FAA amends § 39.13 by removing Amendment 39-14431 (70 FR 76385, December 27, 2005), and by adding a new airworthiness directive, Amendment 39-14632, to read as follows:

2006-12-07 Engine Components Incorporated (ECi): Amendment 39-14632. Docket No. FAA-2005-22358; Directorate Identifier 2005-NE-20-AD.

### (a) Effective Date

  (a) This airworthiness directive (AD) becomes effective July 11, 2006.

### (b) Affected ADs

  (b) This AD supersedes 2005-26-10, Amendment 39-14431.

### (c) Applicability

  (c) This AD applies to Lycoming Engines (formerly Textron Lycoming) models 320, 360, and 540 series, parallel valve, reciprocating engines:

  (1) Specified in Table 1 of this AD; and

  (2) With ECi cylinder assemblies, part number (P/N) AEL65102 series “Classic Cast”, having casting head markings EC 65099-REV-1; and

  (3) With serial numbers (SNs) 1 through 9879 (SN may have an “L” prefix for a long reach spark plug), (sold from January 1997 to September 2001) installed.

  (4) The set of numbers appearing on the cylinder, below and to the left of the SN, in the form of “12345-67” is not used for determining applicability.

*Table 1.—Engine Models*

| Cylinder head part No. | Installed on engine models |
| --- | --- |
| AEL65102-NST04 | O-320-A1B, A2B, A2C, A2D, A3A, A3B, B2B, B2C, B2D, B2E, B3B, B3C, C2B, C2C, C3B, C3C, D1A, D1AD, D1B, D1C, D1D, D1F, D2A, D2B, D2C, D2F, D2G, D2H, D2J, D3G, E1A, E1B, E1C, E1F, E1J, E2A, E2B, E2C, E2D, E2E, E2F, E2G, E2H, E3D, E3H. IO-320-A1A, A2A, B1A, B1B, B1C, B1D, B1E, B2A, D1A, D1AD, D1B, D1C, E1A, E1B, E2A, E2B. AEIO-320-D1B, D2B, E1A, E1B, E2A, E2B. AIO-320-A1A, A1B, A2A, A2B, B1B, C1B. LIO-320-B1A. |
| AEL65102-NST05 | IO-320-C1A, C1B, C1F, F1A. LIO-320-C1A. |
| AEL65102-NST06 | O-320-A1A, A2A, A2B, A2C, A3A, A3B, A3C, E1A, E1B, E2A, E2C, (also, an O-320 model with no suffix). IO-320-A1A, A2A. |
| AEL65102-NST07 | IO-320-B1A, B1B. LIO-320-B1A. |
| AEL65102-NST08 | O-320-B1A, B1B, B2A, B2B, B3A, B3B, B3C, C1A, C1B, C2A, C2B, C3A, C3B, C3C, D1A, D1B, D2A, D2B, D2C. |
| AEL65102-NST10 | O-360-A1A, A1C, A1D, A2A, A2E, A3A, A3D, A4A, B1A, B1B, B2A, B2B, C1A, C1C, C1G, C2A, C2B, C2C, C2D, D1A, D2A, D2B. IO-360-B1A, B1B, B1C. HO-360-A1A, B1A, B1B. HIO-360-B1A, B1B. AEIO-360-B1B. O-540-A1A, A1A5, A1B5, A1C5, A1D, A1D5, A2B, A3D5, A4A5, A4B5, A4C5, A4D5, B1A5, B1B5, B1D5, B2A5, B2B5, B2C5, B2C5D, B4A5, B4B5, B4B5D, D1A5, E1A, E4A5, E4B5, E4C5, F1A5, F1B5, G1A5, G2A5. IO-540-C1B5, C1C5, C2C, C4B5, C4B5D, C4C5, D4A5, D4B5, N1A5, N1A5D. |
| AEL65102-NST12 | O-360-A1A, A1AD, A1D, A1F, A1F6, A1F6D, A1G, A1G6, A1G6D, A1H, A1H6, A1J, A1LD, A1P, A2A, A2D, A2F, A2G, A2H, A3A, A3AD, A3D, A4A, A4AD, A4D, A4G, A4J, A4JD, A4K, A4M, A4N, A4P, A5AD, B1A, B2C, C1A, C1C, C1E, C1F, C1G, C2A, C2B, C2C, C2D, C2E, C4F, C4P, D2A, F1A6, G1A6. |
|  | HO-360-C1A. |
|  | LO-360-A1G6D, A1H6. |
|  | HIO-360-B1A, B1B, G1A. |
|  | LTO-360-A1A6D. |
|  | TO-360-A1A6D. |
|  | IO-360-B1B, B1BD, B1D, B1E, B1F, B1F6, B1G6, B2E, B2F, B2F6, B4A, E1A, L2A, M1A, M1B. |
|  | AEIO-360-B1B, B1D, B1E, B1F, B1F6, B1G6, B1H, B2F, B2F6, B4A, H1A, H1B. |
|  | O-540-A4D5, B2B5, B2C5, B2C5D, B4B5, B4B5D, E4A5, E4B5, E4B5D, E4C5, G1A5, G1A5D, G2A5, H1A5, H1A5D, H1B5, H1B5D, H2A5, H2A5D, H2B5D. |
|  | IO-540-C4B5, C4B5D, C4D5, C4D5D, D4A5, D4B5, D4C5, N1A5, N1A5D, T4A5D, T4B5, T4B5D, T4C5D, V4A5, V4A5D. |
|  | AEIO-540-D4A5, D4B5, D4C5, D4D5. |
| AEL65102-NST26 | IO-540-J4A5, R1A5. TIO-540-C1A, E1A, G1A, H1A. |
| AEL65102-NST38 | IO-360-F1A. TIO-540-AA1AD, AB1AD, AB1BD, AF1A, AG1A, AK1A, C1A, C1AD, K1AD. LTIO-540-K1AD. |
| AEL65102-NST43 | O-360-J2A. O-540-F1B5, J1A5D, J1B5D, J1C5D, J1D5D, J2A5D, J2B5D, J2C5D, J2D5D, J3A5, J3A5D, J3C5D. IO-540-AB1A5, W1A5, W1A5D, W3A5D. |
| AEL65102-NST44 | O-540-L3C5D. |

For information, the subject engines are installed on, but not limited to, the aircraft listed in the following Table 2:

*Table 2.—Engines Installed On, But Not Limited to*

|  |  |
| --- | --- |
| O-320-A1A | Piper Aircraft: Tri-Pacer (PA-22 “150”, PA-22S “150”), Apache (PA-23), Pawnee (PA-25). Doyn Aircraft: Doyn-Cessna (170, 170A, 170B). Mooney Aircraft: Mark (20A). Dinfia: Ranquel (1A-46). Simmering-Graz Pauker: Flamingo (SGP-M-222). Aviamilano: Scricciolo (P-19). Vos Helicopter Co.: Spring Bok. |
| O-320-A1B | Piper Aircraft: Tri-Pacer (PA-22 “150”, PA-22S “150”), Apache (PA-23). Doyn Aircraft: Doyn-Cessna (170, 170A, 170B). S.O.C.A.T.A.: Horizon (Gardan). |
| O-320-A2A | Piper Aircraft: Tri-Pacer (PA-22 “150”, PA-22S “150”), Agriculture (PA-18A “150”) Super Cub (PA-18 “150”), Caribbean (PA-22 “150”), Pawnee (PA-25). Intermountain Mfg. Co.: Call Air Texas (A-5, A-5T). Lake Aircraft: Colonial (C-1). Rawdon Bros.: Rawdon (T-1, T-15, T-15D). Shinn Engineering: Shinn (2150-A). Dinfia: Ranquel (1A-46). Neiva: (1PD-5802). Sud: Gardan-Horizon (GY-80). LaVerda: Falco (F8L Series II, America). Malmo: Vipan (MF1-10). Kingsford Smith: Autocrat (SCRM-153). Aero Commander: 100. |
| O-320-A2B | Piper Aircraft: Tri-Pacer (PA-22 “150”, PA-22S “150”), Cherokee (PA-28 “150”), Super Cub (PA-18 “150”). Champion Aircraft: Challenger (7GCA, 7GCB, 7KC), Citabria (7GCAA, 7GCRC), Agriculture (7GCBA). Beagle: Pup (150). Artic: Interstate S1B2. Robinson: R-22. Varga: Kachina 2150A. |
| O-320-A2C | Robinson: R-22. Cicare: Cicare AG. Bellanca Aircraft: Citabria 150 (7GCAA), Citabria 150S (7GCBC). |
| O-320-A2D | Piper Aircraft: Apache (PA-23). |
| O-320-A3A | Doyn Aircraft: Doyn-Cessna (170, 170A, 170B). Corben-Fettes: Globe Special (Globe GC-1B). |
| O-320-A3B | Piper Aircraft: Apache (PA-23). Doyn Aircraft: Doyn-Cessna (170, 170A, 170B). Teal II: TSC (1A2). |
| O-320-B1A | Piper Aircraft: Apache (PA-23 “160”). Doyn Aircraft: Doyn-Cessna (170, 170A, 170B). Malmo: Vipan (MF1-10). |
| O-320-B1B | Piper Aircraft: Apache (PA-23 “160”). |
|  | Doyn Aircraft: Doyn-Cessna (170, 170A, 170B) |
| O-320-B2A | Piper Aircraft: Tri-Pacer (PA-22 “160”, PA-22S “160”). |
| O-320-B2B | Piper Aircraft: Tri-Pacer (PA-22 “160”, PA-22S “160”). Beagle: Airedale (D5-160). Fuji-Heavy Industries: Fuji (F-200). Uirapuru: Aerotec 122. |
| O-320-B2C | Robinson: R-22. |
| O-320-B2D | Maule: MX-7-160. |
| O-320-B2E | Lycon. |
| O-320-B3A | Piper Aircraft: Apache (PA-23 “160”). Doyn Aircraft: Doyn-Cessna (170, 170A, 170B). |
| O-320-B3B | Piper Aircraft: Apache (PA-23 “160”). Doyn Aircraft: Doyn-Cessna (170, 170A, 170B). Sud: Gardan (GY80-160). |
| O-320-C1A | Piper Aircraft: Apache (PA-23 “160”). Riley Aircraft: Rayjay (Apache). |
| O-320-C1B | Piper Aircraft: Apache (PA-23 “160”). |
| O-320-C3A | Piper Aircraft: Apache (PA-23 “160”). |
| O-320-C3B | Piper Aircraft: Apache (PA-23 “160”). |
| O-320-D1A | Sud: Gardan (GY-80). Gyroflug: Speed Cancard. Grob: G115. |
| O-320-D1F | Slingsby: T67 Firefly. |
| O-320-D2A | Piper Aircraft: Cherokee (PA-28S “160”). Robin: Major (DR400-140B), Chevalier (DR-360), (R-3140). S.O.C.A.T.A.: Tampico TB9. Slingsby: T67C Firefly. |
|  | Daetwyler: MD-3-160. |
|  | Nash Aircraft Ltd.: Petrel. |
|  | Aviolight: P66D Delta. |
|  | General Avia: Pinguino. |
| O-320-D2B | Beech Aircraft: Musketeer (M-23). Piper Aircraft: Cherokee (PA-28 “160”). |
| O-320-D2J | Cessna Aircraft: Skyhawk 172. |
| O-320-D3G | Piper Aircraft: Warrior II, Cadet (PA-28-161). |
| O-320-E1A | Grob: G115. |
| O-320-E1C | M.B.B. (Messerschmitt-Boelkow-Blohm): Monsun (BO-209-B). |
| O-320-E1F | M.B.B.: Monsun (BO-209-B). |
| O-320-E2A | Piper Aircraft: Cherokee (PA-28 “140”, PA-28 “150”). Robin: Major (DR-340), Sitar, Bagheera (GY-100-135). S.O.C.A.T.A.: Super Rallye (MS-886), Rallye Commodore (MS-892). Siai-Marchetti: (S-202). |
|  | F.F.A.: Bravo (AS-202/15). |
|  | Partenavia: Oscar (P66B), Bucker (131 APM). |
|  | Aeromot: Paulistina P-56. |
|  | Pezetel: Koliber 150. |
| O-320-E2C | Beech Aircraft: Musketeer III (M-23III). M.B.B.: Monsun (BO-209-B). |
| O-320-E2D | Cessna Aircraft: Cardinal (172-I, 177). |
| O-320-E2F | M.B.B.: Monsun (BO-209-B), Wassmer Pacific (WA-51). |
| O-320-E2G | American Aviation Corp.: Traveler. |
| O-320-E3D | Piper Aircraft: Cherokee (140). Beech Aircraft: Sport. |
| IO-320-B2A | Piper Aircraft: Twin Comanche (PA-30). |
| IO-320-B1C | Hi. Shear: Wing. |
| IO-320-B1D | Ted Smith Aircraft: Aerostar. |
| IO-320-C1A | Piper Aircraft: Twin Comanche (PA-30 Turbo). |
| IO-320-D1A | M.B.B.: Monsun (BO-209-C). |
| IO-320-D1B | M.B.B.: Monsun (BO-209-C). |
| IO-320-E1A | M.B.B.: Monsun (BO-209-C). |
| IO-320-E1B | Bellanca Aircraft. |
| IO-320-E2A | Champion Aircraft: Citabria. |
| IO-320-E2B | Bellanca Aircraft. |
| IO-320-F1A | CAAR Engineering: Carr Midget. |
| LIO-320-B1A | Piper Aircraft: Twin Comanche (PA-39). |
| LIO-320-C1A | Piper Aircraft: Twin Comanche (PA-39). |
| AIO-320-B1B | M.B.B.: Monsun (BO-209-C). |
| AEIO-320-D1B | Slingsby: T67M Firefly. |
| AEIO-320-D2B | Hundustan Aeronautics Ltd.: HT-2. |
| AEIO-320-E1A | Bellanca Aircraft. Champion Aircraft. |
| AEIO-320-E1B | Bellanca Aircraft. Champion Aircraft: Decathalon (8KCAB-CS). |
| AEIO-320-E2B | Bellanca Aircraft. Champion Aircraft: Decathalon (8KCAB). |
| O-320-A1A | Riley Aircraft: Riley Twin. |
| O-360-A1A | Beech Aircraft: Travel Air (95, B-95). Piper Aircraft: Comanche (PA-24). |
|  | Intermountain Mfg. Co.: Call Air (A-6). |
|  | Lake Aircraft: Colonial (C-2, LA-4, 4A or 4P). |
|  | Doyn Aircraft: Doyn-Cessna (170B, 172, 172A, 172B). |
|  | Mooney Aircraft: Mark “20B” (M-20B). |
|  | Earl Horton: Pawnee (Piper PA-25). |
|  | Dinfia: Ranquel (1A-51). |
|  | Neiva: (1PD-5901). |
|  | Regente: (N-591). |
|  | Wassmer: Super 4 (WA-50A), Sancy (WA-40), Baladou (WA-40), Pariou (WA-40). |
|  | Sud: Gardan (GY-180). |
|  | Bolkow: (207). |
|  | Partenavia: Oscar (P-66). |
|  | Siai-Marchetti: (S-205). |
|  | Procaer: Picchio (F-15-A). |
|  | S.A.A.B.: Safir (91-D). |
|  | Malmo: Vipan (MF-10B). |
|  | Aero Boero: AB-180. |
|  | Beagle: Airedale (A-109). |
|  | DeHavilland: Drover (DHA-3MK3). |
|  | Kingsford-Smith: Bushmaster (J5-6). |
|  | Aero Engine Service Ltd.: Victa (R-2). |
| O-360-A1AD | S.O.C.A.T.A.: Tabago TB-10. |
| O-360-A1D | Piper Aircraft: Comanche (PA-24). Lake Aircraft: Colonial (LA-4, 4A or 4P). |
|  | Doyn Aircraft: Doyn-Beech (Beech 95). |
|  | Mooney Aircraft: Master “21” (M-20E), Mark “20B”, “20D”, (M20B, M20C), Mooney Statesman (M-20G). |
|  | Dinfia: Querandi (1A-45). |
|  | Wassmer: (WA-50). |
|  | Malmo: Vipan (MF1-10). |
|  | Cessna Aircraft: Skyhawk. |
|  | Doyn Aircraft: Doyn-Piper (PA-23 “160”). |
| O-360-A1F6 | Cessna Aircraft: Cardinal. |
| O-360-A1F6D | Cessna Aircraft: Cardinal 177. Teal III: TSC (1A3). |
| O-360-A1G6 | Aero Commander. |
| O-360-A1G6D | Beech Aircraft: Duchess 76. |
| O-360-A1H6 | Piper Aircraft: Seminole (PA-44). |
| O-360-A1LD | Wassmer: Europa WA-52. |
| O-360-A1P | Aviat: Husky. |
| O-360-A2A | Center Est Aeronautique: Regente (DR-253). S.O.C.A.T.A.: Rallye Commodore (MS-893). Societe Aeronautique Normande: Mousquetaire (D-140). Bolkow: Klemm (K1-107C). Partenavia: Oscar (P-66). Beagle: Husky (D5-180) (J1-U). |
| O-360-A2D | Piper Aircraft: Comanche (PA-24), Cherokee “C” (PA-28 “180”). Mooney Aircraft: Master “21” (M-20D), Mark “21” (M-20E). |
| O-360-A2E | Std. Helicopter. |
| O-360-A2F | Aero Commander: Lark (100). Cessna Aircraft: Cardinal. |
| O-360-A2G | Beech Aircraft: Sport. |
| O-360-A3A | C.A.A.R.P.S.A.N.: (M-23III). |
|  | Societe Aeronautique Normande: Jodel (D-140C). |
|  | Robin: Regent (DR400/180), Remorqueur (DR400/180R). R-3170. |
|  | S.O.C.A.T.A.: Rallye 180GT, Sportavia Sportsman (RS-180). |
|  | Norman Aeroplace Co.: NAC-1 Freelance. |
|  | Nash Aircraft Ltd.: Petrel. |
| O-360-A3AD | S.O.C.A.T.A.: TB-10. Robin: Aiglon (R-1180T). |
| O-360-A4A | Piper Aircraft: Cherokee “D” (PA-28 “180”). |
| O-360-A4D | Varga: Kachina. |
| O-360-A4G | Beech Aircraft: Musketeer Custom III. |
| O-360-A4K | Grumman American: Tiger. Beech Aircraft: Sundowner 180. |
| O-360-A4M | Piper Aircraft: Archer II (PA-28 “18”). Valmet: PIK-23. |
| O-360-A4N | Cessna Aircraft: 172 (Optional). |
| O-360-A4P | Penn Yan: Super Cub Conversion. |
| O-360-A5AD | C. Itoh and Co.: Fuji FA-200. |
| O-360-B2C | Seabird Aviation: SB7L. |
| O-360-C1A | Intermountain Mfg. Co.: Call Air (A-6). |
| O-360-C1E | Bellanca Aircraft: Scout (8GCBC-CS). |
| O-360-C1F | Maule: Star Rocket MX-7-180. |
| O-360-C1G | Christen: Husky (A-1). |
| O-360-C2B | Hughes Tool Co.: (269A). |
| O-360-C2D | Hughes Tool Co.: (269A). |
| O-360-C2E | Hughes Tool Co.: (YHO-2HU) Military. Bellanca Aircraft: Scout (8GCBC FP). |
| O-360-C4F | Maule: MX-7-180A. |
| O-360-C4P | Penn Yan: Super Cub Conversion. |
| O-360-F1A6 | Cessna Aircraft: Cutlass RG. |
| O-360-J2A | Robinson: R22. |
| IO-360-B1A | Beech Aircraft: Travel-Air (B-95A). Doyn Aircraft: Doyn-Piper (PA-23 “200”). |
| IO-360-B1B | Beech Aircraft: Travel-Air (B-95B). Doyn Aircraft: Doyn-Piper (PA-23 “200”). Fuji: (FA-200). |
| IO-360-B1D | United Consultants: See-Bee. |
| IO-360-B1E | Piper Aircraft: Arrow (PA-28 “180R”). |
| IO-360-B1F | Utva: 75. |
| IO-360-B2E | C.A.A.R.P. C.A.P. (10). |
| IO-360-B1F6 | Great Lakes: Trainer. |
| IO-360-B1G6 | American Blimp: Spector 42. |
| IO-360-B2F6 | Great Lakes: Trainer. |
| LO-360-A1G6D | Beech Aircraft: Duchess. |
| LO-360-A1H6 | Piper Aircraft: Seminole (PA-44). |
| IO-360-E1A | T.R. Smith Aircraft: Aerostar. |
| IO-360-L2A | Cessna Aircraft: Skyhawk C-172. |
| IO-360-M1A | Diamond Aircraft: DA-40. |
| IO-360-M1B | Vans Aircraft: RV6, RV7, RV8 Lancair: 360. |
| AEIO-360-B1F | F.F.A.: Bravo (200). Grob: G115/Sport-Acro. |
| AEIO-360-B1G6 | Great Lakes. |
| AEIO-360-B2F | Mundry: CAP-10. |
| AEIO-360-B4A | Pitts: S-1S. |
| AEIO-360-H1A | Bellanca Aircraft: Super Decathalon (8KCAB-180). |
| AEIO-360-H1B | American Champion: Super Decathalon. |
| VO-360-A1A | Brantly Hynes Helicopter: (B-2). |
| VO-360-A1B | Brantly Hynes Helicopter: (B-2, B2-A). Military (YHO-3BR). |
| VO-360-B1A | Brantly Hynes Helicopter: (B-2, B2-A). |
| IVO-360-A1A | Brantly Hynes Helicopter: (B2-B). |
| HO-360-B1A | Hughes Tool Co.: (269A). |
| HO-360-B1B | Hughes Tool Co.: (269A). |
| HO-360-C1A | Schweizer: (300C). |
| HIO-360-B1A | Hughes Tool Co.: Military (269-A-1) (TH-55A). |
| HIO-360-B1B | Hughes Tool Co.: (269A). |
| HIO-360-G1A | Schweizer: (CB). |
| O-540-A1A | Rhein-Flugzeugbau: (RF-1). |
| O-540-A1A5 | Piper Aircraft: Comanche (PA-24 “180”). Helio: Military (H-250). Yoeman Aviation: (YA-1). |
| O-540-A1B5 | Piper Aircraft: Aztec (PA-23 “250”), Comanche (PA-24 “250”). |
| O-540-A1C5 | Piper Aircraft: Comanche (PA-24 “250”). |
| O-540-A1D | Found Bros.: (FBA-2C). Dornier: (DO-28-B1). |
| O-540-A1D5 | Piper Aircraft: Aztec (PA-23 “250”), Comanche (PA-24 “250”), Military Aztec (U-11A). Dornier: (DO-28). |
| O-540-A2B | Aero Commander: (500). Mid-States Mfg. Co.: Twin Courier (H-500), (U-5). |
| O-540-A3D5 | Piper Aircraft: Navy Aztec (PA-23 “250”). |
| O-540-B1A5 | Piper Aircraft: Apache (PA-23 “235”). |
| O-540-B1B5 | Piper Aircraft: Comanche (PA-24 “250”). Doyn Aircraft: Doyn-Piper (PA-24 “250”). |
| O-540-B1D5 | Wassmer: (WA-421). |
| O-540-B2B5 | Piper Aircraft: Pawnee (PA-25 “235”), Cherokee (PA -28 “235”), Aztec (PA-23 “235”). Intermountain Mfg. Co.: Call Air (A-9). Rawdon Bros.: Rawdon (T-1). S.O.C.A.T.A.: Rallye 235CA. |
| O-540-B2C5 | Piper Aircraft: Pawnee (PA-25 “235”). |
| O-540-B4B5 | Piper Aircraft: Cherokee (PA-28 “235”). Embraer: Corioca (EMB-710). S.O.C.A.T.A.: Rallye 235GT, Rallye 235C Maule: Star Rocket (MX-7-235), Super Rocket (M-6-235), Super Std. Rocket (M-7-235). |
| O-540-E4A5 | Piper Aircraft: Comanche (PA-24 “260”). Aviamilano: Flamingo (F-250). Siai-Marchetti: (SF-260), (SF-208). |
| O-540-E4B5 | Britten-Norman: (BN-2). Piper Aircraft: Cherokee Six (PA-32 “260”). |
| O-540-E4C5 | Pilatus Britten-Norman: Islander (BN-2A-26), Islander (BN-2A-27), Islander II (BN-2B-26), Islander (BN-2A-21),Trislander (BN-2A-Mark III-2). |
| O-540-F1B5 | Omega Aircraft: (BS-12D1). Robinson: (R-44). |
| O-540-G1A5 | Piper Aircraft: Pawnee (PA-25 “260”). |
| O-540-H1B5D | Aero Boero: 260. |
| O-540-H2A5 | Embraer: Impanema “AG”. Gippsland: GA-200. |
| O-540-H2B5D | Aero Boero: 260. |
| O-540-J1A5D | Maule: Star Rocket (MX-7-235), Super Rocket (M-6-235), Super Std. Rocket (M-7-235). |
| O-540-J3A5 | Robin: R-3000/235. |
| O-540-J3A5D | Piper Aircraft: Dakota (PA-28-236). |
| O-540-J3C5D | Cessna Aircraft: Skylane RG. |
| O-540-L3C5D | Cessna Aircraft: TR-182, Turbo Skylane RG. |
| O-540-C1B5 | Piper Aircraft: Aztec B (PA-23 “250”), Comanche (PA-24 “250”). |
| IO-540-C1C5 | Riley Aircraft: Turbo-Rocket. |
| IO-540-C4B5 | Piper Aircraft: Aztec C (PA-23 “250”), Aztec F. Wassmer: (WA-421). Avions Pierre Robin: (HR100/250). Bellanca Aircraft: Aries T-250. Aerofab: Renegade 250. |
| IO-540-C4D5 | S.O.C.A.T.A.: TB-20. |
| IO-540-C4D5D | S.O.C.A.T.A.: Trinidad TB-20. |
| IO-540-D4A5 | Piper Aircraft: Comanche (PA-24 “260”). Siai-Marchetti: (SF-260). |
| IO-540-D4B5 | Cerva: (CE-43 Guepard). |
| IO-540-J4A5 | Piper Aircraft: Aztec (PA-23 “250”). |
| IO-540-R1A5 | Piper Aircraft: Comanche (PA-24). |
| IO-540-T4A5D | General Aviation: Model 114. |
| IO-540-T4B5 | Commander: 114B. |
| IO-540-T4B5D | Rockwell: 114. |
| IO-540-T4C5D | Lake Aircraft: Seawolf. |
| IO-540-V4A5 | Maule: MT-7-260, M-7-260. Aircraft Manufacturing Factory. |
| IO-540-V4A5D | Brooklands: Scoutmaster. |
| IO-540-W1A5 | Maule: MX-7-235, MT-7-235, M7-235. |
| IO-540-W1A5D | Maule: Star Rocket (MX-7-235), Super Rocket (M-6-235), Super Std. Rocket (M-7-235). |
| IO-540-W3A5D | Schweizer: Power Glider. |
| AEIO-540-D4A5 | Christen: Pitts (S-2S), (S-2B). Siai-Marchetti: SF-260. H.A.L.: HPT-32. Slingsby: Firefly T3A. |
| AEIO-540-D4B5 | Moravan: Zlin-50L. H.A.L.: HPT-32. |
| AEIO-540-D4D5 | Burkhart Grob: Grob G, 115T Aero. |
| TIO-540-C1A | Piper Aircraft: Turbo Aztec (PA-23-250). |
| TIO-540-K1AD | Piper Aircraft. |
| TIO-540-AA1AD | Aerofab Inc.: Turbo Renegade (270). |
| TIO-540-AB1AD | S.O.C.A.T.A.: Trinidad TC TB-21. |
| TIO-540-AB1BD | Schweizer. |
| TIO-540-AF1A | Mooney Aircraft: “TLS” M20M. |
| TIO-540-AG1A | Commander Aircraft: 114TC. |
| TIO-540-AK1A | Cessna Aircraft: Turbo Skylane T182T. |
| LTIO-540-K1AD | Piper Aircraft. |

### (d) Unsafe Condition

  (d) This AD results from reports of applicability errors found in AD 2005-26-10. We are issuing this AD to prevent loss of engine power due to cracks in the cylinder assemblies and possible engine failure caused by separation of a cylinder head.

### (e) Compliance

  (e) You are responsible for having the actions required by this AD performed within the compliance times specified unless the actions have already been done.

### (f) Engines Not Overhauled or Repaired Since New

  (f) If your engine has not been overhauled or had any major repair since new, no further action is required.

### (g) Engines Overhauled or Repaired Since New

  (g) If your engine was overhauled or repaired since new, do the following:

  (1) Determine if ECi cylinder assemblies, P/N AEL65102 series “Classic Cast”, having casting head markings EC 65099-REV-1 and SNs 1 through 9879 (SN may have an “L” prefix for a long reach spark plug) are installed on your engine, as follows:

    (i) Inspect the engine log books and maintenance records for reference to the subject ECi cylinder assemblies.

    (ii) If the engine log books and maintenance records did not record the P/N and SN of the cylinder assemblies, visually inspect the cylinder assemblies and verify the P/N and SN of the cylinder assemblies.

  (2) If the cylinder assemblies are not ECi, P/N AEL65102 series “Classic Cast”, having casting head markings EC 65099-REV-1, no further action is required.

  (3) If any cylinder assembly is an ECi P/N AEL65102 series “Classic Cast”, having casting head markings EC 65099-REV-1 and a SN 1 through 9879 (SN may have an “L” prefix for a long reach spark plug), do the following:

    (i) If the cylinder assembly has fewer than 800 operating hours-in-service (HIS) on the effective date of this AD, replace the cylinder assembly at no later than 800 operating HIS. No action is required until the operating HIS reaches 800 hours.

    (ii) If the cylinder assembly has 800 operating HIS or more on the effective date of this AD, replace the cylinder assembly within 60 operating HIS after the effective date of this AD.

### (h) Definition of a Replacement Cylinder Assembly

  (h) For the purpose of this AD, a replacement cylinder assembly is defined as follows:

  (1) A serviceable cylinder assembly made by Lycoming Engines.

  (2) A serviceable FAA-approved, Parts Manufacturer Approval cylinder assembly from another manufacturer.

  (3) A serviceable ECi cylinder assembly,P/N AEL65102 series, “Titan”, having casting P/N AEL85099.

  (4) A serviceable ECi cylinder assembly, P/N AEL65102 series “Classic Cast”, having casting head markings EC 65099-REV-1, that has a SN 9880 or higher (SN may have an “L” prefix for a long reach spark plug).

### (i) Prohibition of Cylinder Assemblies, P/N AEL65102 Series “Classic Cast”, Having Casting Head Markings EC 65099-REV-1 and SNs 1 Through 9879

    (i) After the effective date of this AD, do not install any ECi cylinder assembly, P/N AEL65102, having casting head markings EC 65099-REV-1 that has a SN 1 through 9879 (SN may have an “L” prefix for a long reach spark plug), onto any engine.

### (j) Alternative Methods of Compliance

  (j) The Manager, Special Certification Office, has the authority to approve alternative methods of compliance for this AD if requested using the procedures found in 14 CFR 39.19.

### (k) Related Information

  (k) ECi Service Bulletin No. 05-08, Revision 2, dated February 28, 2006, pertains to the subject of this AD.

## Rule preamble

### Dates

This AD becomes effective July 11, 2006.

### Addresses

You may examine the AD docket on the Internet at http://dms.dot.gov or in Room PL-401 on the plaza level of the Nassif Building, 400 Seventh Street, SW., Washington, DC.

### For further information contact

Peter Hakala, Aerospace Engineer, Special Certification Office, FAA, Rotorcraft Directorate, 2601 Meacham Blvd., Fort Worth, TX 76193; telephone (817) 222-5145; fax (817) 222-5785.

### SUPPLEMENTARY INFORMATION

The FAA proposed to amend 14 CFR part 39 with a proposed AD. The proposed AD applies to Lycoming Engines models 320, 360, and 540 series, “Parallel Valve” reciprocating engines, with certain ECi cylinder assemblies, P/N AEL65102 series “Classic Cast”, installed. We published the proposed AD in the Federal Register on February 24, 2006 (71 FR 9480). That action proposed to require the same actions as AD 2005-26-10, but would replace the “Engine Models” Table 1 and “Engines Installed On, But Not Limited To” Table 2 with corrected tables. Also, that action proposed to correct the casting part number.

### Examining the AD Docket

You may examine the docket that contains the AD, any comments received, and any final disposition in person at the Docket Management Facility Docket Office between 9 a.m. and 5 p.m., Monday through Friday, except Federal holidays. The Docket Office (telephone (800) 647-5227) is located on the plaza level of the Department of Transportation Nassif Building at the street address stated in ADDRESSES. Comments will be available in the AD docket shortly after the DMS receives them.

### Comments

We provided the public the opportunity to participate in the development of this AD. We have considered the comments received.

### Request To Change All References to Casting P/N AEL65099

One commenter requests that we change all references to casting P/N AEL65099 to read “casting head markings EC 65099-REV-1” to more accurately describe the actual markings. We agree, and made the reference changes in the AD.

### Request To Explain Another Set of Numbers on the Cylinder

The same commenter requests that we explain that the set of numbers appearing on the cylinder below and to the left of the SN, in the form of “12345-67” is not used for determining applicability. We agree, and have added a statement to point this out in the AD.

### Update to Related Information

Under paragraph (k), Related Information, we updated the reference to ECi Service Bulletin No. 05-08, Revision 1, dated December 29, 2005, to Revision 2, dated February 28, 2006.

### Conclusion

We have carefully reviewed the available data, including the comments received, and determined that air safety and the public interest require adopting the AD with the changes described previously. We have determined that these changes will neither increase the economic burden on any operator nor increase the scope of the AD.

### Costs of Compliance

We estimate that 7,557 ECi cylinder assemblies are installed on Lycoming engines in the United States. We estimate that it will take about two workhours per engine to perform the aircraft inspections of the cylinder assemblies for applicability, and that the average labor rate is $65 per workhour. From the Lycoming Engines “Removal and Installation Labor Allowance Guidebook”, dated May 2000, the complete cylinder replacement for a four cylinder engine takes 12 hours, while the complete cylinder replacement for a six cylinder engine takes 16 hours. Required parts will cost about $1,000 per cylinder assembly. Based on these figures, we estimate that the total cost of the AD to U.S. operators to be $9,152,140. ECi indicated that they might give operators and repair stations credit for returned cylinder assemblies toward the purchase of new ECi cylinder assemblies.

### Authority for This Rulemaking

Title 49 of the United States Code specifies the FAA's authority to issue rules on aviation safety. Subtitle I, section 106, describes the authority of the FAA Administrator. Subtitle VII, Aviation Programs, describes in more detail the scope of the Agency's authority.

We are issuing this rulemaking under the authority described in subtitle VII, part A, subpart III, section 44701, “General requirements.” Under that section, Congress charges the FAA with promoting safe flight of civil aircraft in air commerce by prescribing regulations for practices, methods, and procedures the Administrator finds necessary for safety in air commerce. This regulation is within the scope of that authority because it addresses an unsafe condition that is likely to exist or develop on products identified in this rulemaking action.

### Regulatory Findings

We have determined that this AD will not have federalism implications under Executive Order 13132. This AD will not have a substantial direct effect on the States, on the relationship between the national government and the States, or on the distribution of power and responsibilities among the various levels of government.

For the reasons discussed above, I certify that this AD:

  (1) Is not a “significant regulatory action” under Executive Order 12866;

  (2) Is not a “significant rule” under DOT Regulatory Policies and Procedures (44 FR 11034, February 26, 1979); and

  (3) Will not have a significant economic impact, positive or negative, on a substantial number of small entities under the criteria of the Regulatory Flexibility Act.

We prepared a summary of the costs to comply with this AD and placed it in the AD Docket. You may get a copy of this summary at the address listed under ADDRESSES.

## Affected data sheets (53, first 50) (OpenAirDocs)

The type certificate data sheets whose models the AD names.

- [TCDS E-286](https://openairdocs.org/tcds/E-286): Lycoming Engines; names 62 of 72 models: LO-360-A1H6, O-360-C1C, O-360-C1A, O-360-B1A, O-360-A1A, O-360-A1H6, O-360-A1G6, O-360-G1A6…
- [TCDS E-274](https://openairdocs.org/tcds/E-274): Lycoming Engines; names 54 of 60 models: O-320-D2G, O-320-E2G, O-320-D3G, O-320-C2B, O-320-E2B, O-320-E2C, O-320-D2H, O-320-B3B…
- [TCDS E-295](https://openairdocs.org/tcds/E-295): Lycoming Engines; names 46 of 47 models: O-540-L3C5D, O-540-J2B5D, O-540-J1B5D, O-540-B2C5, O-540-B1D5, O-540-G2A5, O-540-H2A5, O-540-H1B5D…
- [TCDS 1E10](https://openairdocs.org/tcds/1E10): Lycoming Engines; names 31 of 89 models: AEIO-360-B1G6, HIO-360-B1B, IO-360-B2F6, AEIO-360-B1H, HIO-360-G1A, IO-360-B1G6, IO-360-B2E, IO-360-B1F…
- [TCDS 1E12](https://openairdocs.org/tcds/1E12): Lycoming Engines; names 31 of 32 models: AEIO-320-E1B, AEIO-320-D2B, AIO-320-C1B, AIO-320-A1A, IO-320-B1C, IO-320-C1B, LIO-320-B1A, IO-320-B1D…
- [TCDS 1E4](https://openairdocs.org/tcds/1E4): Lycoming Engines; names 28 of 81 models: IO-540-W1A5, AEIO-540-D4B5, IO-540-C4D5, IO-540-W3A5D, IO-540-C1B5, IO-540-N1A5, IO-540-C4B5, AEIO-540-D4A5…
- [TCDS E14EA](https://openairdocs.org/tcds/E14EA): Lycoming Engines; names 12 of 40 models: TIO-540-G1A, TIO-540-C1A, TIO-540-AB1AD, TIO-540-AB1BD, TIO-540-AF1A, TIO-540-AG1A, TIO-540-H1A, TIO-540-AK1A…
- [TCDS 3A23](https://openairdocs.org/tcds/3A23): Maule Aerospace Technology Inc.; names 9 of 50 models: M-7-260, MX-7-235, M-6-235, MX-7-180, MT-7-260, MX-7-180A, M-7-235, MT-7-235…
- [TCDS 2A13](https://openairdocs.org/tcds/2A13): Piper Aircraft Inc.; names 6 of 18 models: PA-28-150, PA-28-236, PA-28-140, PA-28S-160, PA-28-161, PA-28-180
- [TCDS 2A3](https://openairdocs.org/tcds/2A3): Mooney International Corporation; names 6 of 17 models: M20D, M20A, M20B, M20C, M20G, M20M
- [TCDS A-759](https://openairdocs.org/tcds/A-759): American Champion Aircraft Corp.; names 6 of 22 models: 7KC, 7GCBA, 7GCA, 7GCAA, 7GCBC, 7GCB
- [TCDS 3A12](https://openairdocs.org/tcds/3A12): Textron Aviation Inc.; names 5 of 18 models: 172Q, 172A, 172, 172B, 172I
- [TCDS A17EU](https://openairdocs.org/tcds/A17EU): Britten-Norman Aerospace Ltd.; names 5 of 18 models: BN-2A-26, BN-2B-26, BN-2A-27, BN-2A-21, BN-2
- [TCDS 1A10](https://openairdocs.org/tcds/1A10): Piper Aircraft Inc.; names 4 of 6 models: PA-23-160, PA-23-235, PA-23-250 (Navy UO-1), PA-23
- [TCDS 1A13](https://openairdocs.org/tcds/1A13): Revo Incorporated; names 4 of 7 models: Lake Model 250, Lake LA-4A, Lake LA-4, Lake LA-4P
- [TCDS 1A6](https://openairdocs.org/tcds/1A6): Piper Aircraft Inc.; names 4 of 8 models: PA-22S-150, PA-22-160, PA-22-150, PA-22S-160
- [TCDS A-758](https://openairdocs.org/tcds/A-758): Aircraft Parts & Development Corp.; names 4 of 11 models: A-9, A-6, A-5, A-5T
- [TCDS A51EU](https://openairdocs.org/tcds/A51EU): Daher Aerospace; names 4 of 5 models: TB9, TB 21, TB 20, TB 10
- [TCDS 2H2](https://openairdocs.org/tcds/2H2): Brantly International Inc.; names 3 of 3 models: B-2B, B-2A, B-2
- [TCDS 3A13](https://openairdocs.org/tcds/3A13): Textron Aviation Inc.; names 3 of 23 models: TR182, 182, T182T
- [TCDS 3A16](https://openairdocs.org/tcds/3A16): Textron Aviation Inc.; names 3 of 21 models: 95, B95, B95A
- [TCDS A-799](https://openairdocs.org/tcds/A-799): Textron Aviation Inc.; names 3 of 3 models: 170, 170A, 170B
- [TCDS A12SO](https://openairdocs.org/tcds/A12SO): Commander Aircraft Corporation; names 3 of 8 models: 114B, 114, 114TC
- [TCDS 1A15](https://openairdocs.org/tcds/1A15): Piper Aircraft Inc.; names 2 of 4 models: PA-24, PA-24-260
- [TCDS 4H12](https://openairdocs.org/tcds/4H12): Schweizer RSG LLC; names 2 of 6 models: 269A-1, 269A
- [TCDS 7A14](https://openairdocs.org/tcds/7A14): Daher; names 2 of 13 models: MS 893E, Rallye 235C
- [TCDS A16EA](https://openairdocs.org/tcds/A16EA): True Flight Holdings LLC; names 2 of 4 models: AA-5B, AA-5
- [TCDS A1EA](https://openairdocs.org/tcds/A1EA): Piper Aircraft Inc.; names 2 of 3 models: PA-30, PA-39
- [TCDS A34EU](https://openairdocs.org/tcds/A34EU): ACC Columbia Jet Service GmbH; names 2 of 3 models: AS 202/15 BRAVO, AS 202/18A BRAVO
- [TCDS A8SO](https://openairdocs.org/tcds/A8SO): Aviat Aircraft Inc.; names 2 of 7 models: S-2B, S-2S
- [TCDS E26EA](https://openairdocs.org/tcds/E26EA): Lycoming Engines; names 2 of 6 models: TO-360-A1A6D, LTO-360-A1A6D
- [TCDS 1A2](https://openairdocs.org/tcds/1A2): Piper Aircraft Inc.; names 1 of 18 models: PA-18-150
- [TCDS 1A8](https://openairdocs.org/tcds/1A8): Helio Alaska Inc.; names 1 of 9 models: H-250
- [TCDS 1H14](https://openairdocs.org/tcds/1H14): Omega Aircraft Corporation; names 1 of 1 models: BS-12D1
- [TCDS 3A17](https://openairdocs.org/tcds/3A17): Textron Aviation Inc.; names 1 of 12 models: 172RG
- [TCDS 4A19](https://openairdocs.org/tcds/4A19): Augustair Inc.; names 1 of 3 models: 2150A
- [TCDS A-447](https://openairdocs.org/tcds/A-447): National Aeronca Association; names 1 of 1 models: C-1
- [TCDS A-766](https://openairdocs.org/tcds/A-766): Swift Museum Foundation Inc.; names 1 of 2 models: GC-1B
- [TCDS A11WE](https://openairdocs.org/tcds/A11WE): Aerostar Aircraft Corporation; names 1 of 2 models: 360
- [TCDS A13CE](https://openairdocs.org/tcds/A13CE): Textron Aviation Inc.; names 1 of 3 models: 177
- [TCDS A16CE](https://openairdocs.org/tcds/A16CE): Textron Aviation Inc.; names 1 of 4 models: 207
- [TCDS A17WE](https://openairdocs.org/tcds/A17WE): Aerostar Aircraft Corporation; names 1 of 5 models: PA-60-600 (Aerostar 600)
- [TCDS A19SO](https://openairdocs.org/tcds/A19SO): Piper Aircraft Inc.; names 1 of 2 models: PA-44-180
- [TCDS A1CE](https://openairdocs.org/tcds/A1CE): Textron Aviation Inc.; names 1 of 14 models: A23A
- [TCDS A21CE](https://openairdocs.org/tcds/A21CE): American Champion Aircraft Corp.; names 1 of 2 models: 8KCAB
- [TCDS A22NM](https://openairdocs.org/tcds/A22NM): Aviat Aircraft Inc.; names 1 of 5 models: A-1
- [TCDS A29EU](https://openairdocs.org/tcds/A29EU): Britten-Norman Aerospace Ltd.; names 1 of 3 models: BN2A MK. III-2
- [TCDS A3SO](https://openairdocs.org/tcds/A3SO): Piper Aircraft Inc.; names 1 of 13 models: PA-32-260
- [TCDS A47CE](https://openairdocs.org/tcds/A47CE): Diamond Aircraft Industries Inc.; names 1 of 3 models: DA 40
- [TCDS A69EU](https://openairdocs.org/tcds/A69EU): Airbus Poland S.A.; names 1 of 2 models: PZL-KOLIBER 150A

All 53: https://openairdocs.org/ad/2006-12-07/tcds.md

## Registered aircraft it may apply to (OpenAirDocs)

Matched by airframe and engine model; the AD's applicability may narrow it by serial number, part number or equipment.

- Aircraft: 84,966 (35,761 by airframe model, 77,302 by engine model)
- Makers: Piper 32,355, Cessna 22,911, Mooney 3,850, Beech 1,722, Robinson Helicopter 1,628, Textron 1,602, Bellanca 1,527, Grumman American Avn. 1,284, American Champion 961, Maule 913

Models with the most aircraft:

- [Lycoming 0-320 series](https://openairdocs.org/engine/lycoming-0-320-series): 27,057 aircraft (engine model)
- [Lycoming O&VO-360 series](https://openairdocs.org/engine/lycoming-o-vo-360-series): 11,931 aircraft (engine model)
- [Lycoming I0360 series](https://openairdocs.org/engine/lycoming-i0360-series): 6,174 aircraft (engine model)
- [Lycoming 0-540 series](https://openairdocs.org/engine/lycoming-0-540-series): 5,228 aircraft (engine model)
- [Lycoming TI0-540 series](https://openairdocs.org/engine/lycoming-ti0-540-series): 4,886 aircraft (engine model)
- [Piper PA-28-140](https://openairdocs.org/model/piper-pa-28-140): 4,258 aircraft (airframe model)
- [Lycoming IO-540 series](https://openairdocs.org/engine/lycoming-io-540-series): 3,997 aircraft (engine model)
- [Piper PA-28-180](https://openairdocs.org/model/piper-pa-28-180): 3,504 aircraft (airframe model)
- [Lycoming IO-360-L2A](https://openairdocs.org/engine/lycoming-io-360-l2a): 2,644 aircraft (engine model)
- [Piper PA-18-150](https://openairdocs.org/model/piper-pa-18-150): 2,054 aircraft (airframe model)
- [Cessna 172](https://openairdocs.org/model/cessna-172): 1,805 aircraft (airframe model)
- [Lycoming IO-320 series](https://openairdocs.org/engine/lycoming-io-320-series): 1,707 aircraft (engine model)
- [Piper PA-28-161](https://openairdocs.org/model/piper-pa-28-161): 1,497 aircraft (airframe model)
- [Cessna 170B](https://openairdocs.org/model/cessna-170b): 1,299 aircraft (airframe model)
- [Mooney M20C](https://openairdocs.org/model/mooney-m20c): 1,258 aircraft (airframe model)
- [Piper PA-22-150](https://openairdocs.org/model/piper-pa-22-150): 1,200 aircraft (airframe model)
- [Lycoming O-360 series](https://openairdocs.org/engine/lycoming-o-360-series): 1,023 aircraft (engine model)
- [Lycoming IO-360-B4A](https://openairdocs.org/engine/lycoming-io-360-b4a): 985 aircraft (engine model)
- [Lycoming 0-360-A1D](https://openairdocs.org/engine/lycoming-0-360-a1d): 968 aircraft (engine model)
- [Piper PA-23-250](https://openairdocs.org/model/piper-pa-23-250): 894 aircraft (airframe model)

All 384 models: https://openairdocs.org/ad/2006-12-07/models.md
Every aircraft: https://openairdocs.org/ad/2006-12-07/aircraft.md

## Related documents

- [AD 2005-26-10](https://openairdocs.org/ad/2005-26-10) (historical): ECi cylinder assemblies. · Lycoming Engines AEIO-320-D1B, AEIO-320-D2B, AEIO-320-E1A and 413 more. Effective Jan 31, 2006. Replaced by this AD

No proposed rule in this release led to it. Its text cites no advisory circulars or STCs.

---
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