concern regarding a missed Global Positioning System (GPS)

concern regarding a missed Global Positioning System (GPS)

SPECIAL AIRWORTHINESS
    FAA
    Aviation Safety    INFORMATION BULLETIN
    SAIB:    CE-10-38R1
    SUBJ: Navigation    Date:    August 18, 2010
    This is information only. Recommendations aren¡¦t mandatory.
    Introduction
    This Special Airworthiness Information Bulletin advises you of an airworthiness concern regarding a
    missed Global Positioning System (GPS) Non-Precision Approach (NPA), which may be caused by
    the Honeywell GPS sensor when no backup navigation system is available on flights greater than 5
    hours.
    The sensors are used in the following products:
    „F    Flight Management System: GNS-XES, GNS-XLS, GNS-XLS Enhanced, GNS-XLS
    PRNAV, GNS-XLS Enhanced PRNAV, GNS-XL, GNS-XL PRNAV, GS-2100, CDU-XLS
    „F    GPS Navigator: KLN-35A, KLN-89B, KLN-90B, KLN-94, KLN-900, KLX-135, KLX-
    135A, KLX-189B
    „F    TAWS: KMH-820, KMH-920, KGP-560, KGP-860, MK-XXI, MK V, MK VII, MK VI, MK
    VIII, MK XXII
    „F    GNSS: KGS-200
    „F    IC-615:  IC-615
    „F    EPIC Radio: VIDL-G
    At this time, the FAA has determined that this airworthiness concern is not an unsafe condition that
    would warrant airworthiness directive (AD) action under Title 14 of the Code of Federal Regulations
    (14 CFR) part 39.
    This SAIB revises SAIB CE-10-38, dated July 15, 2010, by updating the models and part numbers.
    Background
    On March 30, 2010, Honeywell International, Inc. (Olathe, KS) provided the Wichita Aircraft
    Certification Office (ACO) written notification of a possible safety issue (i.e., annunciated temporary
    loss of GPS navigation) against the Mercury PX Global Navigation System Sensor (GNSS) within its
    host VOR/ILS Data Link with GPS (VIDL-G) Receiver (Honeywell P/N: 7026207-802), which was
    initially discovered during an extended flight on a Dassault F7X airplane.
    An end customer flying a Dassault F7X airplane with a Honeywell VIDL-G Navigation Receiver
    experienced an annunciated temporary loss of GPS navigation during an extended flight between
    ESGG (Gothenburg-Landvetter Airport, Sweden) and KBFI (Boeing Field, Seattle WA).  Flight deck
    effects included steady reduction in the number of tracked GPS satellites resulting in related CAS
    messages (NAV: FMS/GPS 1+2 MONITOR), degradation of the GPS operating mode to altitude
    aiding, and ultimately temporary loss of navigation from the GPS.  The end customer reported this
    issue to the airframe manufacturer who, in turn, notified Honeywell.
    The VIDL-G navigation receiver incorporates a Mercury PX GNSS and is certified to TSO-C129a
    (Class B1/C1) Airborne Supplemental Navigation Equipment using the GPS. This annunciated
    1

    temporary loss of GPS navigation function had not been previously observed by Honeywell and was
    not revealed by TSO-C129a testing.
    Honeywell has isolated the issue to a latent defect in the software that is common to all of
    Honeywell¡¦s 8-channel GPS receivers. The affected models and their part numbers are listed below.
    Model Part Number(s)
    CDU-XLS 18420-0101-0xxx
    GNS-XES    17450-0305-xxxx, 17450-0307-xxxx, 17450-0406-xxxx
    GNS-XL 18355-0101-00xx, 18355-0101-01xx
    GNS-XL PRNAV    18355-0102-xxxx
    GNS-XLS 17960-0101-0xxx, 17960-0102-0xxx
    GNS-XLS Enhanced    17960-0203-0xxx
    GNS-XLS Enhanced
    PRNAV 17960-0204-0xxx
    GNS-XLS PRNAV    17960-0103-0xxx
    GS-2100 066-01160-2502
    IC 615    7017000-21xxx,-25xxx,-94xxx, -95xxx, -98xxx, -99xxx
    KGP 560    066-01196-0x0x (RMD PN 965-1196-0xx, 965-1198-0xx)
    KGP 860    066-01197-0205 (RMD PN 965-1199-00x)
    KGS 200    066-01201-0101
    KLN 35A    066-01151-0101
    KLN 89B    066-01148-x1x1, 066-01148-x1x2
    KLN 900    066-04034-0101,-0201, -0102, -0104, -0202, and -0204
    KLN 90B    066-04031-xxx1, 066-04031-xxx2, 066-04031-xxx4
    KLN 94    069-01034-01xx
    KLX 135    070-01029-0000, 070-01029-0001
    KLX 135A    069-01029-0703
    KLX 189B    066-01161-7000
    KMH 820    066-01175-210x, 066-01175-220x
    KMH 920    066-01178-210x, 066-01178-220x
    965-0976-020-XXX-XXX, 965-0976-060-XXX-XXX,
    MK V    965-1681-002
    MK VI    965-1186-XXX, 965-1190-XXX
    965-1076-020-XXX-XXX, 965-1076-030-XXX-XXX,
    MK VII    965-1076-060-XXX-XXX
    MK VIII    965-1216-XXX, 965-1220-XXX
    MK XXI    066-01227-0x01x (RMD PN 965-1227-00x)
    MK XXII    965-1590-XXX, 965-1595-XXX
    VIDL-G 7026207-XXX
    2

    Recommendations
    The FAA recommends that the pilot assure that he/she is prepared to revert to an alternative means of
    navigation appropriate to the flight if the above situation occurs.
    For Further Information Contact
    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 .
    3

Dan Weiler
Executive Director of the Cessna Owner Organization
(715) 445-5000, ext. 116
This e-mail address is being protected from spambots. You need JavaScript enabled to view it

Daniel
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