Pratt & Whitney Canada PW118A, Engine s/n 115120
INTRODUCTION
Airnorth Regional experienced operational problems with a Pratt and Whitney Canada PW118A engine (engine s/n PC-E 115120). The problems ranged from hung starts resulting in aborted hot starts to vibration (sub-idle vibration) and noise from the high-pressure (HP) rotor. These problems occurred over a period of several days. In order to resolve the problems, the engine was removed from the aircraft to allow further investigation through disassembly.
Disassembly revealed that the bolted joint between the HP turbine disk and…