Thu, Jul 05, 2007
NAV425EX-100 Units Affected
Aero-News learned Wednesday that
Crossbow Technologies has released a Service Bulletin affecting
NAV425EX-100 systems, part numbers 8360-0171-01 and
8350-0171-01.
The NAV425EX-100 is designed to provide correct attitude and
heading information during all flight conditions. However, under
specific GPS satellite conditions inaccurate GPS information can be
generated within the NAV425EX-100 which may result in inaccurate
data from the NAV425EX-100. Inaccurate bank and heading indications
have been observed under such conditions. The condition can be
detected by comparison to backup mechanical attitude indicators,
magnetic compass or the outside horizon if flying VFR.
The GPS manufacturer has issued a software update to the GPS
firmware inside the NAV425EX-100 that eliminates erroneous data
during specific satellite configurations and flight profiles. The
GPS settings have also been further tightened by Crossbow to
improve the quality of data that is utilized for navigation by the
NAV425EX-100 during normal operation.
The NAV425EX-100 firmware has also been updated to provide
additional features to the user, including BIT status changes that
will provide additional levels of detail in regards to the
operation of the NAV425EX-100. Finally, the NAV425EX-100 firmware
has also been updated to increase heading slaving to the
magnetometer, effectively improving heading response to magnetic
field changes.
The bulletin is mandatory for IFR flight operations utilizing
the NAV425EX-100. It is voluntary for VFR flight operations. All
versions of the NAV425EX-200 are covered under a separate bulletin,
and are not affected by this latest issuance.
Crossbow Letter NAV425-06-07 describes the conditions, how to
recognize the conditions, and procedures for continued safe
operation.
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