The FAA has issues a Special Airworthiness Information Bulletin
(SAIB) for all modification levels of Honeywell GNS Series
Navigation Systems: GNS_XLS PRNAV, part number (P/N)
17960-0103-XXX; GNS_XLS Enhanced PRNAV, P/N 17960-0204-XXX; and
GNS_XL PRNAV, P/N 18355-0102-0XXX.
Honeywell has recently discovered a software anomaly in their
GNS Navigation Systems. This anomaly may affect the area navigation
(RNAV) procedures, which contain RF (Radius-to-a-Fix) legs. If an
RNAV procedure containing RF legs is loaded into the flight plan
with the navigation system being used to fly the full procedure,
the GNS system could fail to capture and fly the RF leg curved path
and continue past the waypoint on an undetermined track line. It
should be noted that the GNS PRNAV systems are not approved for
RNAV Required Navigation Performance (RNP) procedures. Honeywell
Service Information Letter (Publication Number D201003000024) has
been issued.
The FAA recommends that pilots using these systems adhere to the
following:
Do not load any approach or departure procedure listed in Table
3 of the above-referenced Service Information Letter.
Do not load any approach or departure procedure listed as
Special Aircraft & Aircrew
Authorization Required or Special Authorization Required
printed on the aeronautical chart.
Do not load any approach or departure procedure requiring RF
capability.
Refer to the above-referenced Service Information Letter for
additional guidance.
The administration has determined that the situation does not
require the issuance of an AD at this time.
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