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.
Directive Details
AD Number
FAA-2008-0589
Document Number
E8-28270
Type
Rule
Publication Date
December 4, 2008
Effective Date
January 8, 2009
Affected Manufacturer
Pratt & Whitney PW4000 Series 94-Inch Fan Turbofan
Criticality
important
Emergency
No
Docket ID
Docket No. FAA-2008-0589
Topics
Official Documents
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