Thu, Dec 04, 2008
AD NUMBER: 2008-24-13
MANUFACTURER: Pratt & Whitney
SUBJECT: Airworthiness Directive 2008-24-13
SUMMARY: The FAA is
adopting a new airworthiness directive (AD) for Pratt & Whitney
(P&W) PW4052, PW4056, PW4060, PW4062, PW4152, PW4156A, PW4158,
PW4460, and PW4462 turbofan engines. This AD requires a onetime
visual inspection of all EEC-131 model electronic engine controls
(EECs). This AD also requires the EECs to be identified,
categorized by group number, marked, and replaced using a fleet
management plan. This AD results from a report of an uncommanded
engine in-flight shutdown due to defective EEC pulse width
modulator (PWM) microcircuits. We are issuing this AD to prevent
uncommanded in-flight engine shutdowns which could result in loss
of thrust and prevent continued safe flight or landing.The FAA is
adopting a new airworthiness directive (AD) for Pratt & Whitney
(P&W) PW4052,PW4056, PW4060, PW4062, PW4152, PW4156A, PW4158,
PW4460, and PW4462 turbofan engines. This AD requires a one time
visual inspection of all EEC-131 model electronic engine controls
(EECs). This AD also requires the EECs to be identified,
categorized by group number, marked, and replaced using a fleet
management plan. This AD results from a report of an uncommanded
engine in-flight shutdown due to defective EEC pulse width
modulator (PWM)microcircuits. We are issuing this AD to prevent
uncommanded in-flight engine shutdowns which could result in loss
of thrust and prevent continued safe flight or landing.
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