EASA Regulations for Pratt & Whitney Canada PW305

EASA SIB CASA-2021-09

In-flight Shutdown Events due to Failure of Smiths Electronic Engine Control Units

The Transport Canada Civil Aviation Safety Alert CASA 2021-09 addresses an increased rate of in-flight shutdown events on Pratt & Whitney Canada PW305A engines installed on Learjet 60 aircraft, caused by failures of Smiths Electronic Engine Control (EEC) units. The alert highlights the aging-related failures of EEC units with part number 31B4741 and recommends upgrading to the latest EEC configuration. This safety alert is intended for owners, operators, and maintainers of the affected engines.