Service Instruction No. 1423 A
Supersedes Service Instruction No. 1423
May 13, 2016
MODELS AFFECTED
All Lycoming engines using Thermostatic Oil Cooler Bypass Valve Part Number (P/N) 75944
TIME OF COMPLIANCE
Before next flight REASON FOR REVISION: Loctite® procedure for crimp nut is no longer valid. New superseding part number for thermostatic oil cooler bypass valve.