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59-10-07: Cylinder Baffle Clamps

FAA order 59-10-07 is an airworthiness directive. The FAA's subject line: Cylinder Baffle Clamps. It names the Lycoming GO-480-B, Lycoming GO-480-B1A6, Lycoming GO-480-B1D, Lycoming GO-480-F4A6, Lycoming GO-480-G1A6, Lycoming GO-480-G1B6, Lycoming GO-480-G1D6, Lycoming GO-480-G2D6, Lycoming GO-480 series, Lycoming GSO-480-B1B6, Lycoming GSO-480-B1J6, Lycoming IGSO-480-A1E6, Lycoming O-320-A1A, Lycoming O-320-A1B, Lycoming O-320-A2A, Lycoming O-320-A2B, Lycoming O-320-A3A, Lycoming O-320-A3B, Lycoming O-320-B1A, Lycoming O-320-B1B, Lycoming O-320-B2A, Lycoming O-320-B2B, Lycoming O-320-B3B, Lycoming O-320 series, Lycoming O-340-A1A, Lycoming O-340-B1A, Lycoming O-340 series, Lycoming O-360-A1A, Lycoming O-360-A2A, Lycoming O-360-B1A, Lycoming O-360-B2A, Lycoming O-360-C1A, Lycoming O-360-C2A, Lycoming O-360 series, Lycoming O-540-A1A, Lycoming O-540-A1A5, Lycoming O-540-A1B5, Lycoming O-540-A1C5, Lycoming O-540-A2B, Lycoming O-540-J1A5D, Lycoming O-540-J2A5D engines: about 29,809 aircraft on the U.S. register today across them, though an order usually covers particular versions or serial numbers rather than every one. System: engine.

What it applies to as the FAA lists it

Kind of product: Engine
Makes: Lycoming Engines
Models: 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, GO-480-D1A, GO-480-E1A6, GO-480-F1A6, GO-480-F2A6, GO-480-F3A6, GO-480-F3B6, GO-480-F4A6, GO-480-F4B6, GO-480-F6, GO-480-G1A6, GO-480-G1B6, GO-480-G1D6, GO-480-G2D6, GSO-480-A1A6, GSO-480-A1C6, GSO-480-B1A6, GSO-480-B1B6, GSO-480-B1C6, GSO-480-B2D6, IGSO-480-A1A6, O-320-A1A, O-320-A1B, O-320-A2A, O-320-A2B, O-320-A3A, O-320-A3B, O-320-B1A, O-320-B1B, O-320-B2A, O-320-B2B, O-320-B3A, O-320-B3B, O-340-A1A, O-340-A2A, O-340-B1A, O-360-A1A,...
Engine series: Lycoming GO-480-B 1 aircraft
Lycoming GO-480-B1A6 10 aircraft
Lycoming GO-480-B1D 1 aircraft
Lycoming GO-480-F4A6 1 aircraft
Lycoming GO-480-G1A6 1 aircraft
Lycoming GO-480-G1B6 1 aircraft
Lycoming GO-480-G1D6 7 aircraft
Lycoming GO-480-G2D6 3 aircraft
Lycoming GO-480 series 246 aircraft
Lycoming GSO-480-B1B6 1 aircraft
Lycoming GSO-480-B1J6 3 aircraft
Lycoming IGSO-480-A1E6 1 aircraft
Lycoming O-320-A1A 20 aircraft
Lycoming O-320-A1B 2 aircraft
Lycoming O-320-A2A 9 aircraft
Lycoming O-320-A2B 180 aircraft
Lycoming O-320-A3A 5 aircraft
Lycoming O-320-A3B 12 aircraft
Lycoming O-320-B1A 17 aircraft
Lycoming O-320-B1B 3 aircraft
Lycoming O-320-B2A 11 aircraft
Lycoming O-320-B2B 92 aircraft
Lycoming O-320-B3B 22 aircraft
Lycoming O-320 series 27,315 aircraft
Lycoming O-340-A1A 5 aircraft
Lycoming O-340-B1A 1 aircraft
Lycoming O-340 series 60 aircraft
Lycoming O-360-A1A 600 aircraft
Lycoming O-360-A2A 38 aircraft
Lycoming O-360-B1A 13 aircraft
Lycoming O-360-B2A 3 aircraft
Lycoming O-360-C1A 7 aircraft
Lycoming O-360-C2A 19 aircraft
Lycoming O-360 series 1,066 aircraft
Lycoming O-540-A1A 4 aircraft
Lycoming O-540-A1A5 7 aircraft
Lycoming O-540-A1B5 4 aircraft
Lycoming O-540-A1C5 4 aircraft
Lycoming O-540-A2B 2 aircraft
Lycoming O-540-J1A5D 11 aircraft
Lycoming O-540-J2A5D 1 aircraft

Dates and paperwork

Docket: Unknown
Status: Current
The FAA's document: Read the order on the FAA's site

The order itself the regulatory text, as published

Show the full text (1,045 characters)

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.

Source: FAA Dynamic Regulatory System, airworthiness directives. The FAA's document is the authority; the register counts are this site's, from the FAA register of October 7, 2026. Connections as data: /graph/directive/59-10-07.json · aircraft systems.