Federal Aviation Administration August 14, 2008 – Federal Register Recent Federal Regulation Documents

The FAA proposes to adopt a new airworthiness directive (AD) for P&W PW4052, PW4056, PW4060, PW4062, PW4152, PW4156A, PW4158, PW4460, and PW4462 turbofan engines. This proposed AD would require a onetime visual inspection of all EEC-131 model electronic engine controls (EECs). This proposed AD would require the EECs to be identified, categorized by group number, marked, and replaced using a fleet management plan. This proposed AD results from a report of an uncommanded engine in-flight shutdown due to defective EEC pulse width modulator (PWM) microcircuits. We are proposing this AD to prevent uncommanded in-flight engine shutdowns which could result in loss of thrust and prevent continued safe flight or landing.