Supersedes Service Instruction No. 1304H

November 12, 1999

MODELS AFFECTED

All Textron Lycoming aircraft engines.

TIME OF COMPLIANCE

Whenever a nameplate is lost or an engine modification affects model designation.

A replacement nameplate, to replace one that has been lost, will be issued only upon written request when accompanied by a document from the FAA authorizing a replacement nameplate.

Supersedes Service Instruction No. 1191

September 28, 1998

MODELS AFFECTED

All Lycoming aircraft engines.

TIME OF COMPLIANCE

As required to determine cylinder compression

Supersedes Service Bulletin No. 505A

December 1, 1997

MODELS AFFECTED

The following Textron Lycoming four cylinder engines which utilize fixed pitch propellers except those installed in rotary wing aircraft or new engines shipped after February 15,1997:

All 320 series engines; and

All 180 horsepower, 360 series engines except the O-360-A4A, -A4D, A4G, - A4J, -A4K, -A4M, -A4N, -A4P -C4F, -C4P, IO-360-L2A and AEIO-360-B4A engine models.

TIME OF COMPLIANCE

Uncoated Crankshafts (no "PID" stamped on flange OD, see Figure 1)

Supersedes Service Instruction No. 1187H

DATE: May 23, 1997

MODELS AFFECTED

TIO-540-A1A, -A1B, -A2A, -A2B, -A2C, -C1A, -F2BD, -J2B, -J2BD, -N2BD, -AA1AD, -AB1AD, -AF1A, -AF1B, -AG1A; LTIO-540-F2BD, -J2B, -J2BD, -N2BD.

TIME OF COMPLIANCE

On newly installed engines; before aircraft is flown. Also recommended at 100 hour inspection or at owner's discretion.

Supersedes Service Letter No. L185 A

January 19, 1988

Models Affected

To all Owners and Operators of Textron Lycoming Aircraft Engines

Supersedes Service Letter No. L192A

January 19, 1988

Models Affected

To all Owners and Operators of Lycoming Aircraft Engines.

In many cases spark plug fouling resulting from the tetraethyl lead (TEL) in aviation fuels can be reduced or eliminated by proper operating techniques. 

DATE: April 25, 1986

MODELS AFFECTED

Avco Lycoming Direct Drive Engines.

TIME OF COMPLIANCE

At next overhaul or earlier at owner's discretion.

DATE: July 30, 1976

MODELS AFFECTED

O-235; O-290; O, IO, AIO, AEIO, LIO-320 series; O, IO, AIO, AEIO, HIO, LIO-360 series; O-540 series except dual magneto models identified by “D” as 5th character in model designation; IO, AEIO-540 series except IO-540- E1A5, -K1B5, -K1E5, -P1A5, -S1A5 using large volume oil pump and dual magneto models.

TIME OF COMPLIANCE

At next overhaul.

Supersedes Service Instruction No. 1047A

DATE: November 24, 1967

MODELS AFFECTED

All Avco Lycoming engines with nitride hardened steel cylinder barrels.

TIME OF COMPLIANCE

During overhaul of the engine.

January 28, 1983

Models Affected

To Owners and Operators of Lycoming Reciprocating Aircraft Engines.

This Service Letter is to clarify Lycoming’s position on the fuel grades that are specified for use in our reciprocating engine models.