Airworthiness Directives; AlliedSignal Avionics, Inc. Models GNS- XINFLS/INF and GNS-XINFL/INF Flight Management Systems

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This document proposes to revise Airworthiness Directive (AD) 97-05-03, which currently requires inserting a limitation into the Operations Limitation Section of the Airplane Flight Manual (AFM) or Flight Manual Supplement for all owners/operators of aircraft equipped with Allied Signal Avionics Inc. (AlliedSignal) Models GNS- X LS or GNS-X L global positioning systems (GPS) flight management system. The limitation specifies prohibiting the use of these AlliedSignal GPS units on previously published non-precision approaches. Since issuance of AD 97-05-03, AlliedSignal has issued service information that specifies procedures for accomplishing hardware and software modifications to the affected flight management systems. The Federal Aviation Administration (FAA) has determined that accomplishment of the actions of the service bulletins should be considered as an alternative method of compliance to the actions of AD 97-05-03. The proposed AD would retain the actions of AD 97-05-03, and would incorporate the service bulletins into the proposed AD, as an alternative method of compliance to the existing AD. The actions specified by the proposed AD are intended to continue to prevent devi