AD 2017-12-03
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | Pratt & Whitney | Division | Airworthiness Directives; Pratt & Whitney Division Turbofan Engines |
Unsafe Condition
An unrecoverable engine in-flight shutdown (IFSD) after an ice crystal icing event, followed by an attempt to rapidly restart the engine with the Electronic Engine Control (EEC) Active Clearance Control (ACC) turned on, caused contraction of the high-pressure turbine (HPT) case, reduced clearances in the HPT, subsequent HPT damage, and rotor seizure.
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Required Actions
Install a software standard eligible for installation and preclude the use of EEC software standards earlier than SCN 5B/I. All engines with EEC model numbers EEC104-40 and EEC104-60 must upgrade software earlier than software standard SCN 5B/I by 2024.
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Compliance Time
Within the next engine shop visit for engines currently operating in the Asia Pacific region; for all other engines, compliance is required by 2024.
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Affected Aircraft
Pratt & Whitney Division PW2037, PW2037M, and PW2040 turbofan engines with EEC model numbers EEC104-40 and EEC104-60.
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Source: Official FAA Source ↗
Retrieved: Apr 4, 2026
Rights: U.S. Government Public Domain
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