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. Many Avco Lycoming engines are presently manufactured with cylinder assemblies that incorporate nitride hardened steel cylinder barrels. Because this cylinder barrel surface is hardened, the repair...

This article is the first of three that explains in more detail Lycoming Engines's position on automotive fuels. The bottom line is that it's possible to make automotive gasoline "fitfor-purpose" for aviation. However, in doing so, you deviate from "pump gas" and end up creating a low octane unleaded aviation fuel from automotive gasoline blend stock - "mogas." Why do we need to have fuels "fit...

Automotive fuel from the pump is NOT the same everywhere you go. There are summer blends, winter blends, geographical blends within the seasonal changes, varying levels and types of oxygenates (not just ethanol) and when tanks are switched over a mixture of "in between". The pump labeling is accurate for octane, and in some parts of the world, the maximum percentage of ethanol. It doesn't tell you...

Lycoming tests every engine that rolls off our assembly line. We take them into one of our test cells, attach a propeller and appropriate sensors, and then operate them through a range of tests. These tests can last from an hour up to four hours. We also use our test cells to evaluate components and new products. Every year we do this for about 3000-4000 engines. Lycoming purchases and consumes a...

August 31, 2005 MODELS AFFECTED New, rebuilt and overhauled engines from Lycoming with fuel pumps P/N LW-15399, LW-15472, LW-15473, and LW-16335 shipped between February 1, 2000 and September 15, 2005. Engine models affected are O- 235; O-290; O-340; (L)O and IO-320, -360, -540; AIO-320, -360; AEIO-320, -360, -540; HO-360; HIO-360; and TO-360. Fuel pumps P/N LW-15399, LW-15472, LW-15473, and LW...

October 10, 2014 MODELS AFFECTED Lycoming Engine Model TIO-540-AJ1A with a Serial Number Identified in Table 1 or any TIO-540-AJ1A with a Turbocharger Mounting Bracket Purchased as a Spare between April 5, 2012 and May 29, 2014 TIME OF COMPLIANCE The Required Action must be completed within the next 25 hours or next scheduled maintenance event (whichever occurs first) for: Engines identified in...

DATE: March 6, 2014 MODELS AFFECTED New, rebuilt, or overhauled Lycoming engine models and spares identified in Tables 1 and 2 in the attached bulletin. Lycoming turbocharger P/N’s LW­12463, LW­13987, and LW­18470 fieldoverhauled or repaired with back plate (HET) P/N 406795­0058 (Refer to the latest revision of (HET) Alert Service Bulletin No. 057.) TIME OF COMPLIANCE Refer to the “Compliance”...

Supersedes Service Bulletin No. 342F MODELS AFFECTED All fuel injected Lycoming engines indicated in fuel line and clamping diagrams. TIME OF COMPLIANCE Examine fuel lines every 100 hours, annual inspection, overhaul and any time fuel lines or clamps are serviced, removed, or replaced. This Service Bulletin contains procedures for installation, inspection, and corrective action of fuel lines on...

DATE: October 4, 2012 MODELS AFFECTED All Lycoming engines in Table 1 (in the attached bulletin) equipped with Slick 4200/6200 or 4300/6300 series Impulse and Direct Drive magnetos. TIME OF COMPLIANCE As required by Slick SB1­-12. This Service Bulletin is notification of required action for mandatory compliance with Slick Service Bulletin No. SB1­12 dated 9/6/2012, regarding Lycoming engine models...