Supersedes Service Letter No. L192A
January 19, 1988
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
Avco Lycoming Direct Drive Engines.
At next overhaul or earlier at owner's discretion.
DATE: July 30, 1976
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.
At next overhaul.
Supersedes Service Instruction No. 1047A
DATE: November 24, 1967
All Avco Lycoming engines with nitride hardened steel cylinder barrels.
During overhaul of the engine.
January 28, 1983
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.
November 26,1971
To all owners and operators of Avco Lycoming Aircraft Engines.
As the use of spectrometric lubricating oil analysis has become more widespread in the field of general aviation, the problems of methods, procedures, schedules andinterpretation of data have become prevalent. This service letter is an attempt to clarify the subject and to define how lubricating oil analysis can be used as another tool in the maintenance of modern reciprocating aircraft piston engines.
(Supersedes Service Bulletin No. 381, Service Bulletin No. 385, Service Bulletin No. 454B, Service Bulletin No. 455D, and Service Bulletin No. 456F)
DATE: September 1, 1995
See attached Lists I and II for specific models and serial numbers. All new, overhauled and remanufactured engines shipped from the factory after March 31, 1985 are in compliance with this Service Bulletin.
DATE: March 7, 2001
I. Any Textron Lycoming model TIO-540-AE2A engine listed on ATTACHMENT I that has not complied with the connecting rod bearing replacement requirement of Special Advisory No. 59-800.
II. Except if replaced in compliance with Special Advisory No. 59-800, any TIO-540- AE2A engine known to have had connecting rod bearings field replaced after August 25, 1995.
At earliest possible opportunity, but no later than October 1, 2001.
On page 9 of 9 of Service Instruction No. 1029D, the wrench part number STD375 (3/4 inch Hex head) for cylinder base nut part number STD2090 should be wrench part number ST375 (3/4 inch Hex head).
On page 7 of 9 of Service Instruction No. 1029D, the first sentence of step 8, should read as follows: 8. Using the same sequence as described in paragraphs 5 and 6, and shown in Figure 12, check all 1/2 inch nuts for tightness by bringing torque to 600 in. lb. (50 ft. lb.).
