Honeywell has recently discovered a software anomaly in their GNS Navigation Systems.

Honeywell has recently discovered a software anomaly in their GNS Navigation Systems.

The FAA has completed a full review of this issue. At this time, the airworthiness concern is not an
unsafe condition that would warrant airworthiness directive (AD) action under Title 14 of the Code of
Federal Aviation Regulations (14 CFR) part 39.
Select the following in order:
Support
Technical Publications
Safety/Certification Related Documents
SIL GNS_XLS_RF Leg Approaches
SPECIAL AIRWORTHINESS
INFORMATION BULLETIN
FAA
Aviation Safety
SAIB:
Date:
CE-10-22
March 26, 2010
SUBJ: Navigation
This is information only. Recommendations aren’t mandatory.
Introduction
This Special Airworthiness Information Bulletin advises you of an airworthiness concern regarding
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.
1
Background
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.
Recommendations
After reviewing the above data, we recommend that you adhere to the following:
1. Do not load any approach or departure procedure listed in Table 3 of the above-referenced
Service Information Letter.
2. Do not load any approach or departure procedure listed as Special Aircraft & Aircrew
Authorization Required or Special Authorization Required printed on the aeronautical
chart.
3. Do not load any approach or departure procedure requiring RF capability.
4. Refer to the above-referenced Service Information Letter for additional guidance.
The Honeywell website also provides information on this subject and can be accessed at:
https://portal.honeywell.com/wps/portal/aero

Albert Ma, Aerospace Engineer, FAA Wichita Aircraft Certification Office, Mid-Continent Airport
1801 Airport Rd., Wichita, KS 67209; phone: (316) 946-4151; fax: (316) 946-4107; e-mail:
This e-mail address is being protected from spambots. You need JavaScript enabled to view it .

Dan Weiler
Executive Director of the Cessna Owner Organization
(715) 445-5000, ext. 116
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Daniel
Executive Director
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