# AD 59-10-07: Cylinder Baffle Clamps - Type: Airworthiness directive - Status: Current - Products: Lycoming Engines GO-480-A1A, GO-480-B, GO-480-B1A6, GO-480-B1B, GO-480-B1C, GO-480-B1D, GO-480-C1B6, GO-480-C1D6, GO-480-C2C6, GO-480-C2D6, GO-480-C2E6, GO-480-C3A6 and 49 more - Superseded by: Nothing supersedes this AD - Product type: Engine - Registered aircraft: 47,149 may be affected, by airframe or engine model (OpenAirDocs) - FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/8A95DA2CA656BA5A862568270071A53D.0001 - DRS record last changed: May 30, 2024 - Page: https://openairdocs.org/ad/59-10-07 ## The airworthiness directive 59-10-07 LYCOMING: Applies to O-320, O-340, O-360, GO-480, GSO-480, IGSO-480 and O-540 Series Engines As Noted. Compliance required as soon as possible but not later than July 1, 1959. It has been found that due to normal expansion of the cylinders during engine operation, the cylinder baffle clamps can become wedged between the cylinders causing barrel distortion and possible extensive damage to the cylinder bore and piston assembly. To correct this condition, the cylinder baffle clamps must either be (1) removed and replaced with baffle retainers and retainer hooks, or (2) removed and reworked to provide more clearance between the lower portion of the clamp and the cylinder. Lycoming Service Bulletin No. 254A lists the parts required to comply with alternate method (1) above. An acceptable method of accomplishing the rework noted as alternate method (2) is also outlined in that bulletin, as well as the serial numbers of engines which comply with the requirements of this directive as delivered from the factory. ## Affected data sheets (6) (OpenAirDocs) The type certificate data sheets whose models the AD names. - [TCDS E-275](https://openairdocs.org/tcds/E-275): Lycoming Engines; names 25 of 33 models: GO-480-F3A6, GO-480-C1B6, GO-480-C2C6, GO-480-F1A6, GO-480-B1C, GO-480-C3A6, GO-480-B1D, GO-480-C2E6… - [TCDS E-274](https://openairdocs.org/tcds/E-274): Lycoming Engines; names 12 of 60 models: O-320-B3B, O-320-A1B, O-320-A2A, O-320-B3A, O-320-B2A, O-320-A3A, O-320-A3B, O-320-A1A… - [TCDS E-284](https://openairdocs.org/tcds/E-284): Lycoming Engines; names 7 of 23 models: IGSO-480-A1A6 (O-480-3), GSO-480-B1C6, GSO-480-A1C6, GSO-480-B1B6 (O-480-1), GSO-480-A1A6, GSO-480-B2D6, GSO-480-B1A6 - [TCDS E-286](https://openairdocs.org/tcds/E-286): Lycoming Engines; names 7 of 72 models: O-360-C1A, O-360-B1A, O-360-A1A, O-360-B2A, O-360-C2B, O-360-A2A, O-360-C2A - [TCDS E-295](https://openairdocs.org/tcds/E-295): Lycoming Engines; names 7 of 47 models: O-540-A1A5, O-540-A1A, O-540-J2A5D, O-540-A1C5, O-540-J1A5D, O-540-A1B5, O-540-A2B - [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 ## 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: 47,149 (0 by airframe model, 47,149 by engine model) - Makers: Piper 21,330, Cessna 12,527, Mooney 1,561, Beech 1,263, Grumman American Avn. 1,169, Bellanca 769, Robinson Helicopter 636, Maule 412, American Champion 346, Champion 310 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 0-540 series](https://openairdocs.org/engine/lycoming-0-540-series): 5,228 aircraft (engine model) - [Lycoming O-360 series](https://openairdocs.org/engine/lycoming-o-360-series): 1,023 aircraft (engine model) - [Lycoming O-360-A1A](https://openairdocs.org/engine/lycoming-o-360-a1a): 601 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 O-320-A2B](https://openairdocs.org/engine/lycoming-o-320-a2b): 180 aircraft (engine model) - [Lycoming O-320-B2B](https://openairdocs.org/engine/lycoming-o-320-b2b): 92 aircraft (engine model) - [Lycoming 0-340 series](https://openairdocs.org/engine/lycoming-0-340-series): 60 aircraft (engine model) - [Lycoming GSO&IGSO-480 series](https://openairdocs.org/engine/lycoming-gso-igso-480-series): 59 aircraft (engine model) - [Lycoming 0-360 series](https://openairdocs.org/engine/lycoming-0-360-series): 44 aircraft (engine model) - [Aerosport O-360-A1A](https://openairdocs.org/engine/aerosport-o-360-a1a): 42 aircraft (engine model) - [Lycoming O-360-A2A](https://openairdocs.org/engine/lycoming-o-360-a2a): 38 aircraft (engine model) - [Lycoming O-320-B3B](https://openairdocs.org/engine/lycoming-o-320-b3b): 22 aircraft (engine model) - [Aerosport O-360 A2A](https://openairdocs.org/engine/aerosport-o-360-a2a): 21 aircraft (engine model) - [Lycoming O-320-A1A](https://openairdocs.org/engine/lycoming-o-320-a1a): 21 aircraft (engine model) - [Lycoming O-360-C2A](https://openairdocs.org/engine/lycoming-o-360-c2a): 19 aircraft (engine model) - [Lycoming O-320-B1A](https://openairdocs.org/engine/lycoming-o-320-b1a): 17 aircraft (engine model) - [Lycoming O-540 series](https://openairdocs.org/engine/lycoming-o-540-series): 17 aircraft (engine model) All 54 models: https://openairdocs.org/ad/59-10-07/models.md Every aircraft: https://openairdocs.org/ad/59-10-07/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.