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Airworthiness Directives; Honeywell International Inc. (Honeywell) Enhanced Ground Proximity Warning System (EGPWS)

Notice of proposed rulemaking (NPRM).

We propose to adopt a new airworthiness directive (AD) for various normal and transport category rotorcraft with certain Honeywell EGPWS installed. This proposed AD would require updating the software version of the EGPWS. This proposed AD is prompted by a software defect that prevents the EGPWS from providing terrain warnings. The proposed actions are intended to address an unsafe condition on these products.

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