AD 2008-24-13
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | Pratt & Whitney | PW4000 Series 94-Inch Fan | Airworthiness Directives; Pratt & Whitney PW4000 Series 94-Inch Fan Turbofan Engines |
Unsafe Condition
Defective EEC pulse width modulator (PWM) microcircuits can cause uncommanded engine in-flight shutdowns, leading to loss of thrust.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Inspect all EEC-131 model electronic engine controls (EECs) visually. Identify, categorize by group number, mark, and replace EECs using a fleet management plan. Group 4 EECs are exempt from scheduled replacement requirements.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Within cycles in service from the effective date of this AD.
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Affected Aircraft
Pratt & Whitney PW4052, PW4056, PW4060, PW4062, PW4152, PW4156A, PW4158, PW4460, and PW4462 turbofan engines.
AI-generated summary from the source AD text. Verify against the official source before acting.
Source: Official FAA Source ↗
Retrieved: Apr 4, 2026
Rights: U.S. Government Public Domain
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