AD NUMBER: 2009-05-08
MANUFACTURER: Nav Systems
SUBJECT: Airworthiness Directive 2009-05-08 SUMMARY: This amendment
adopts a new airworthiness directive (AD) for the Trimble or
FreeFlight Systems 2101 I/O Approach Plus global positioning system
(GPS) navigation system (2101 I/O Approach Plus system) that
requires a software upgrade for this system.
This amendment is prompted by an incident that led to the
discovery of several annunciation errors with the 2101 I/O Approach
The actions specified by this AD are intended to prevent a pilot
from making an unsafe decision based on erroneous information
provided by the 2101 I/O Approach Plus system, which could result
in loss of control of the aircraft.