# AD 66-06-03: Connecting Rod Assemblies - Type: Airworthiness directive - Status: Current - Products: Lycoming Engines GO-435-C2 (O-435-17), GO-435-C2A, GO-435-C2A2, GO-435-C2B, GO-435-C2B1, GO-435-C2B2, GO-435-C2E, GO-435-D1, GO-480-A1A, GO-480-B, GO-480-B1A6, GO-480-B1B and 308 more - Effective: January 16, 1969 - Superseded by: Nothing supersedes this AD - Product type: Engine - Amendment: 39-708 - Registered aircraft: 78,699 may be affected, by airframe or engine model (OpenAirDocs) - FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/A52E4B4099C72B1486256D500042A05B.0001 - DRS record last changed: May 30, 2024 - Page: https://openairdocs.org/ad/66-06-03 ## The airworthiness directive 66-06-03 LYCOMING: Amdt. 39-708. Applies to Model IO-360-A1A Engines with Serial Numbers 101-51 through 1231-51A, and All Engines Remanufactured by Lycoming Prior to December 1, 1964. Compliance required as indicated. To prevent further failures of connecting rod assemblies, P/N 74503 and P/N 74308, accomplish the following: (a) Replace connecting rod assemblies P/N 74503 and P/N 74308 with 200 or more hours' time in service on the effective date of this AD with connecting rod assembly P/N 75059 within the next 50 hours' time in service in accordance with Lycoming Service Bulletin No. 302 or later FAA-approved revision. (b) Replace connecting rod assemblies P/N 74503 and P/N 74308 with less than 200 hours' time in service on the effective date of this AD with connecting rod assembly P/N 75059 before the accumulation of 250 hours' time in service in accordance with Lycoming Service Bulletin No. 302 or later FAA-approved revision. Effective March 13, 1966.Revised January 16, 1969. ## Affected data sheets (42) (OpenAirDocs) The type certificate data sheets whose models the AD names. - [TCDS E-274](https://openairdocs.org/tcds/E-274): Lycoming Engines; names 34 of 60 models: O-320-C2B, O-320-E2B, O-320-E2C, O-320-B3B, O-320-C3A, O-320-C2A, O-320-D2A, O-320-A1B… - [TCDS E-275](https://openairdocs.org/tcds/E-275): Lycoming Engines; names 28 of 33 models: GO-480-F3A6, GO-480-C1B6, GO-480-C2C6, GO-480-F1A6, GO-480-G2F6, GO-480-B1C, GO-480-C3A6, GO-480-B1D… - [TCDS E-295](https://openairdocs.org/tcds/E-295): Lycoming Engines; names 28 of 47 models: O-540-B2C5, O-540-B1D5, O-540-B2B5, O-540-A1D, O-540-A4B5, O-540-F1B5, O-540-A3D5, O-540-A4C5… - [TCDS E-286](https://openairdocs.org/tcds/E-286): Lycoming Engines; names 22 of 72 models: O-360-C1C, O-360-C1A, O-360-B1A, O-360-A1A, O-360-A3D, O-360-A4A, O-360-B2A, O-360-A1D… - [TCDS E-284](https://openairdocs.org/tcds/E-284): Lycoming Engines; names 20 of 23 models: IGSO-480-A1A6 (O-480-3), IGSO-480-A1B6, GSO-480-B2H6, GSO-480-B1F6, GSO-480-B1E6, GSO-480-B1C6, IGSO-480-A1C6, GSO-480-A1C6… - [TCDS E-304](https://openairdocs.org/tcds/E-304): Lycoming Engines; names 20 of 21 models: VO-540-B2G, VO-540-B2A, VO-540-B2D, VO-540-B1B3, VO-540-B1D, VO-540-B1C, VO-540-B1A, VO-540-A2A… - [TCDS 1E4](https://openairdocs.org/tcds/1E4): Lycoming Engines; names 19 of 81 models: IO-540-A1A5, IO-540-B1C5, IO-540-G1A5, IO-540-C4D5, IO-540-C1B5, IO-540-G1B5, IO-540-B1B5, IO-540-C4B5… - [TCDS 1E10](https://openairdocs.org/tcds/1E10): Lycoming Engines; names 17 of 89 models: HIO-360-B1B, HIO-360-C1B, IO-360-B1C, IO-360-A2A, IO-360-B1D, IO-360-A2B, IO-360-C1B, IO-360-B1B… - [TCDS E-228](https://openairdocs.org/tcds/E-228): Lycoming Engines; names 16 of 20 models: O-435-A, O-435-A2, GO-435-C2B1, O-435-C2 (O-435-13), O-435-K, GO-435-C2A, GO-435-C2E, GO-435-C2 (O-435-17)… - [TCDS E-223](https://openairdocs.org/tcds/E-223): Lycoming Engines; names 12 of 43 models: O-235-A, O-235-C2B, O-235-C1, O-235-BP, O-235-C1A, O-235-B, O-235-C1B, O-235-AP… - [TCDS E-229](https://openairdocs.org/tcds/E-229): Lycoming Division AVCO Corporation; names 10 of 10 models: O-290-D2, O-290-D, O-290-B, O-290-A, O-290-CP, O-290-AP, O-290-D2A, O-290-C… - [TCDS 1E12](https://openairdocs.org/tcds/1E12): Lycoming Engines; names 9 of 32 models: IO-320-B1C, IO-320-B1D, IO-320-B2A, IO-320-C1A, IO-320-B1B, IO-320-B1A, IO-320-A1A, IO-320-E2A… - [TCDS TC 210](https://openairdocs.org/tcds/TC%20210): Textron Lycoming AVCO Corporation; names 8 of 8 models: GO-145-C3, O-145-B2, O-145-B1, O-145-C2, GO-145-C1, GO-145-C2, O-145-B3, O-145-C1 - [TCDS 1E7](https://openairdocs.org/tcds/1E7): Lycoming Engines; names 7 of 8 models: IGSO-540-A1F, IGSO-540-B1A, IGSO-540-A1C, IGSO-540-A1A, IGSO-540-B1C, IGSO-540-A1D, IGSO-540-A1E - [TCDS E-279](https://openairdocs.org/tcds/E-279): Lycoming Engines; names 7 of 7 models: VO-435-A1A (O-435-21), VO-435-A1F, VO-435-A1C (O-435-23; -23A; -23B; -23C), VO-435-A1E, VO-435-A1D (O-435-6A), VO-435-B1A, VO-435-A1B (O-435-6) - [TCDS 1E13](https://openairdocs.org/tcds/1E13): Lycoming Engines; names 6 of 11 models: TVO-435-A1A, O-435-25, TVO-435-C1A, TVO-435-B1B, TVO-435-B1A (O-435-25A), TVO-435-D1A - [TCDS 1E11](https://openairdocs.org/tcds/1E11): Lycoming Engines; names 5 of 6 models: IGO-540-B1B, IGO-540-B1A, IGO-540-B1C, IGO-540-A1A, IGO-540-A1B - [TCDS E-202](https://openairdocs.org/tcds/E-202): Textron Lycoming AVCO Corporation; names 5 of 5 models: R-680-E2, R-680-E1, R-680-E3A, R-680-E3B, R-680-E3 - [TCDS 1E1](https://openairdocs.org/tcds/1E1): Lycoming Engines; names 4 of 4 models: IVO-360-A1A, VO-360-A1A, VO-360-B1A, VO-360-A1B - [TCDS E-256](https://openairdocs.org/tcds/E-256): Textron Lycoming AVCO Corporation; names 4 of 4 models: GSO-580-C, GSO-580, GSO-580-B, GSO-580-D - [TCDS ATC 81](https://openairdocs.org/tcds/ATC%2081): Textron Lycoming AVCO Corporation; names 3 of 3 models: R-680-BA, R-680-B2, R-680-2 - [TCDS E-277](https://openairdocs.org/tcds/E-277): Lycoming Engines; names 3 of 3 models: O-340-A2A, O-340-B1A, O-340-A1A - [TCDS E-285](https://openairdocs.org/tcds/E-285): Lycoming Engines; names 3 of 3 models: SO-580-A1B, SO-580-A1A, VSO-580-A1A - [TCDS E10EA](https://openairdocs.org/tcds/E10EA): Lycoming Engines; names 3 of 5 models: TIO-541-E1A4, TIO-541-E1B4, TIO-541-A1A - [TCDS 1E14](https://openairdocs.org/tcds/1E14): Lycoming Engines; names 2 of 2 models: TIVO-540-A2A, TVO-540-A1A - [TCDS 1E15](https://openairdocs.org/tcds/1E15): Textron Lycoming Subsidiary of Textron Inc.; names 2 of 12 models: IO-720-B1A, IO-720-A1B - [TCDS ATC 110](https://openairdocs.org/tcds/ATC%20110): Textron Lycoming AVCO Corporation; names 2 of 2 models: R-680-B5, R-680-5 - [TCDS ATC 111](https://openairdocs.org/tcds/ATC%20111): Textron Lycoming AVCO Corporation; names 2 of 2 models: R-680-B6, R-680-6 - [TCDS E-276](https://openairdocs.org/tcds/E-276): Lycoming Engines; names 2 of 2 models: GSO-435-B2, GSO-435-B - [TCDS TC 108](https://openairdocs.org/tcds/TC%20108): Textron Lycoming AVCO Corporation; names 2 of 2 models: R-680-4, R-680-B4 Series - [TCDS TC 199](https://openairdocs.org/tcds/TC%20199): Textron Lycoming AVCO Corporation; names 2 of 2 models: O-145-A1, O-145-A2 - [TCDS TC 227](https://openairdocs.org/tcds/TC%20227): Textron Lycoming AVCO Corporation; names 2 of 2 models: O-350-A, O-350 - [TCDS ATC 182](https://openairdocs.org/tcds/ATC%20182): Textron Lycoming AVCO Corporation; names 1 of 1 models: R-530-D1 - [TCDS ATC 183](https://openairdocs.org/tcds/ATC%20183): Textron Lycoming AVCO Corporation; names 1 of 1 models: R-530-D2 - [TCDS ATC 42 Textron Lycoming](https://openairdocs.org/tcds/ATC%2042%20Textron%20Lycoming): Textron Lycoming AVCO Corporation; names 1 of 1 models: R-680 - [TCDS E11EA](https://openairdocs.org/tcds/E11EA): Lycoming Engines; names 1 of 1 models: IVO-540-A1A - [TCDS E14EA](https://openairdocs.org/tcds/E14EA): Lycoming Engines; names 1 of 40 models: TIO-540-A1A - [TCDS TC 172](https://openairdocs.org/tcds/TC%20172): Textron Lycoming AVCO Corporation; names 1 of 1 models: R-680-D5 - [TCDS TC 173](https://openairdocs.org/tcds/TC%20173): Textron Lycoming AVCO Corporation; names 1 of 1 models: R-680-D6 - [TCDS TC 475](https://openairdocs.org/tcds/TC%20475): Textron Lycoming AVCO Corporation; names 1 of 1 models: P220 - [TCDS TC 5E-12](https://openairdocs.org/tcds/TC%205E-12): Textron Lycoming AVCO Corporation; names 1 of 1 models: Military O-435-2-M1 - [TCDS TC 729](https://openairdocs.org/tcds/TC%20729): Textron Lycoming AVCO Corporation; names 1 of 1 models: F220 ## 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: 78,699 (0 by airframe model, 78,699 by engine model) - Makers: Piper 34,176, Cessna 16,821, Mooney 3,798, Beech 2,159, Bellanca 1,558, Grumman American Avn. 1,495, Robinson Helicopter 1,299, Champion 824, Maule 690, American 488 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 0-235 series](https://openairdocs.org/engine/lycoming-0-235-series): 6,133 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) - [Lycoming IO-540 series](https://openairdocs.org/engine/lycoming-io-540-series): 4,219 aircraft (engine model) - [Lycoming 0-290 series](https://openairdocs.org/engine/lycoming-0-290-series): 2,126 aircraft (engine model) - [Lycoming IO-320 series](https://openairdocs.org/engine/lycoming-io-320-series): 1,707 aircraft (engine model) - [Lycoming O-360 series](https://openairdocs.org/engine/lycoming-o-360-series): 1,023 aircraft (engine model) - [Lycoming 0-360-A1D](https://openairdocs.org/engine/lycoming-0-360-a1d): 968 aircraft (engine model) - [Lycoming O-360-A1A](https://openairdocs.org/engine/lycoming-o-360-a1a): 601 aircraft (engine model) - [Lycoming 0-145B series](https://openairdocs.org/engine/lycoming-0-145b-series): 538 aircraft (engine model) - [Lycoming HIO-360 series](https://openairdocs.org/engine/lycoming-hio-360-series): 336 aircraft (engine model) - [Lycoming O-540-F1B5](https://openairdocs.org/engine/lycoming-o-540-f1b5): 299 aircraft (engine model) - [Lycoming TI0-541 series](https://openairdocs.org/engine/lycoming-ti0-541-series): 271 aircraft (engine model) - [Lycoming O-320 series](https://openairdocs.org/engine/lycoming-o-320-series): 256 aircraft (engine model) - [Lycoming GO-480 series](https://openairdocs.org/engine/lycoming-go-480-series): 246 aircraft (engine model) - [Lycoming IO-540-D4A5](https://openairdocs.org/engine/lycoming-io-540-d4a5): 237 aircraft (engine model) - [Lycoming R680E series](https://openairdocs.org/engine/lycoming-r680e-series): 225 aircraft (engine model) All 204 models: https://openairdocs.org/ad/66-06-03/models.md Every aircraft: https://openairdocs.org/ad/66-06-03/aircraft.md Its text cites no advisory circulars or STCs. --- OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.