Airworthiness Directives; AlliedSignal Inc. (Formerly Textron Lycoming) Model ALF502R-5 and ALF502R-3A Turborfan Engines
airworthiness · Rule · Final rule. · Published 1999-07-19 · Effective 1999-09-17 · 64 FR 38557
Document
Document number
99-18099
Federal Register citation
64 FR 38557
Type
Rule
Action
Final rule.
Category
airworthiness
Manufacturer
AlliedSignal Inc. (Formerly Textron Lycoming) Model ALF502R-5 and ALF502R-3A Turborfan
Publication date
1999-07-19
Effective date
1999-09-17
FAA docket
Docket No. 98-ANE-42-AD
Abstract
This amendment adopts a new airworthiness directive (AD), applicable to AlliedSignal Inc. Model ALF502R-5 and ALF502R-3A turbofan engines, that requires incorporation of an improved fan core inlet anti-ice system. This amendment is prompted by reports of uncommanded reduction of engine thrust (rollback) and loss of thrust control in icing conditions. The actions specified by this AD are intended to prevent ice accretion on the fan core inlet stator vane surfaces, which can result in engine rollback and loss of thrust control in icing conditions.