Service Bulletin No. 597

DATE: May 4, 2011

MODELS AFFECTED

Spare parts for the engine models identified in Table 1 shipped from Lycoming between August 18, 2010 and April 15, 2011 Lycoming engines, identified in Table 2, with P/N LW-13807 installed at time of purchase and shipped from Lycoming between August 18, 2010 and April 15, 2011.

TIME OF COMPLIANCE

Within 10 hours of engine operation or at the next maintenance event, whichever occurs first.

This Service Bulletin identifies a potential malfunctioning fuel drain valve adapter assembly P/N LW-13807 (Figure 1) on specific Lycoming engines and spare parts shipped between August 18, 2010 and April 15, 2011.